smart_widgets
library
Classes
AboutDialog
An about box. This is a dialog box with the application's icon, name,
version number, and copyright, plus a button to show licenses for software
used by the application.
AboutListTile
A ListTile that shows an about box.
AbsorbPointer
A widget that absorbs pointers during hit testing.
AbstractNode
Deprecated. Unused by the framework and will be removed in a future version
of Flutter. If needed, inline any required functionality of this class
directly in the subclass.
Accumulator
Mutable wrapper of an integer that can be passed by reference to track a
value across a recursive stack.
Action <T extends Intent >
Base class for an action or command to be performed.
ActionChip
A Material Design action chip.
ActionDispatcher
An action dispatcher that invokes the actions given to it.
ActionIconTheme
An inherited widget that overrides the default icon of BackButtonIcon ,
CloseButtonIcon , DrawerButtonIcon , and EndDrawerButtonIcon in this
widget's subtree.
ActionIconThemeData
A ActionIconThemeData that overrides the default icons of
BackButton , CloseButton , DrawerButton , and EndDrawerButton with
ActionIconTheme.of or the overall Theme 's ThemeData.actionIconTheme .
ActionListener
A helper widget for making sure that listeners on an action are removed properly.
Actions
A widget that maps Intent s to Action s to be used by its descendants
when invoking an Action .
ActivateAction
An Action that activates the currently focused control.
ActivateIntent
An Intent that activates the currently focused control.
Adaptation <T >
Defines a customized theme for components with an adaptive factory constructor.
AdaptiveTextSelectionToolbar
The default context menu for text selection for the current platform.
AggregatedTimedBlock
Aggregates multiple TimedBlock objects that share a name .
AggregatedTimings
Provides aggregated results for timings collected by FlutterTimeline .
AlertDialog
A Material Design alert dialog.
Align
A widget that aligns its child within itself and optionally sizes itself
based on the child's size.
Alignment
A point within a rectangle.
AlignmentDirectional
An offset that's expressed as a fraction of a Size , but whose horizontal
component is dependent on the writing direction.
AlignmentGeometry
Base class for Alignment that allows for text-direction aware
resolution.
AlignmentGeometryTween
An interpolation between two AlignmentGeometry .
AlignmentTween
An interpolation between two alignments.
AlignTransition
Animated version of an Align that animates its Align.alignment property.
AlwaysScrollableScrollPhysics
Scroll physics that always lets the user scroll.
AlwaysStoppedAnimation <T >
An animation that is always stopped at a given value.
AndroidMotionEvent
A Dart version of Android's MotionEvent .
AndroidPointerCoords
Position information for an Android pointer.
AndroidPointerProperties
Properties of an Android pointer.
AndroidView
Embeds an Android view in the Widget hierarchy.
AndroidViewController
Controls an Android view that is composed using a GL texture.
AndroidViewSurface
Integrates an Android view with Flutter's compositor, touch, and semantics subsystems.
Animatable <T >
An object that can produce a value of type T given an Animation<double>
as input.
AnimatedAlign
Animated version of Align which automatically transitions the child's
position over a given duration whenever the given alignment changes.
AnimatedBuilder
A general-purpose widget for building animations.
AnimatedContainer
Animated version of Container that gradually changes its values over a period of time.
AnimatedCrossFade
A widget that cross-fades between two given children and animates itself
between their sizes.
AnimatedDefaultTextStyle
Animated version of DefaultTextStyle which automatically transitions the
default text style (the text style to apply to descendant Text widgets
without explicit style) over a given duration whenever the given style
changes.
AnimatedFractionallySizedBox
Animated version of FractionallySizedBox which automatically transitions the
child's size over a given duration whenever the given widthFactor or
heightFactor changes, as well as the position whenever the given alignment
changes.
AnimatedGrid
A scrolling container that animates items when they are inserted into or removed from a grid.
in a grid.
AnimatedGridState
The State for an AnimatedGrid that animates items when they are
inserted or removed.
AnimatedIcon
Shows an animated icon at a given animation progress .
AnimatedIconData
Vector graphics data for icons used by AnimatedIcon .
AnimatedIcons
Identifier for the supported Material Design animated icons.
AnimatedList
A scrolling container that animates items when they are inserted or removed.
AnimatedListState
The AnimatedListState for AnimatedList , a scrolling list container that
animates items when they are inserted or removed.
AnimatedModalBarrier
A widget that prevents the user from interacting with widgets behind itself,
and can be configured with an animated color value.
AnimatedOpacity
Animated version of Opacity which automatically transitions the child's
opacity over a given duration whenever the given opacity changes.
AnimatedPadding
Animated version of Padding which automatically transitions the
indentation over a given duration whenever the given inset changes.
AnimatedPhysicalModel
Animated version of PhysicalModel .
AnimatedPositioned
Animated version of Positioned which automatically transitions the child's
position over a given duration whenever the given position changes.
AnimatedPositionedDirectional
Animated version of PositionedDirectional which automatically transitions
the child's position over a given duration whenever the given position
changes.
AnimatedRotation
Animated version of Transform.rotate which automatically transitions the child's
rotation over a given duration whenever the given rotation changes.
AnimatedScale
Animated version of Transform.scale which automatically transitions the child's
scale over a given duration whenever the given scale changes.
AnimatedSize
Animated widget that automatically transitions its size over a given
duration whenever the given child's size changes.
AnimatedSlide
Widget which automatically transitions the child's
offset relative to its normal position whenever the given offset changes.
AnimatedSwitcher
A widget that by default does a cross-fade between a new widget and the
widget previously set on the AnimatedSwitcher as a child.
AnimatedTheme
Animated version of Theme which automatically transitions the colors,
etc, over a given duration whenever the given theme changes.
AnimatedWidget
A widget that rebuilds when the given Listenable changes value.
AnimatedWidgetBaseState <T extends ImplicitlyAnimatedWidget >
A base class for widgets with implicit animations that need to rebuild their
widget tree as the animation runs.
Animation <T >
A value which might change over time, moving forward or backward.
AnimationController
A controller for an animation.
AnimationMax <T extends num >
An animation that tracks the maximum of two other animations.
AnimationMean
An animation of double s that tracks the mean of two other animations.
AnimationMin <T extends num >
An animation that tracks the minimum of two other animations.
AnimationStyle
Used to override the default parameters of an animation.
AnnotatedRegion <T extends Object >
Annotates a region of the layer tree with a value.
AppBar
A Material Design app bar.
AppBarTheme
Overrides the default values of visual properties for descendant
AppBar widgets.
AppKitView
Widget that contains a macOS AppKit view.
AppKitViewController
Controller for a macOS platform view.
ApplicationSwitcherDescription
Specifies a description of the application that is pertinent to the
embedder's application switcher (also known as "recent tasks") user
interface.
AppLifecycleListener
A listener that can be used to listen to changes in the application
lifecycle.
AsciiCodec
An AsciiCodec allows encoding strings as ASCII bytes
and decoding ASCII bytes to strings.
AsciiDecoder
Converts ASCII bytes to string.
AsciiEncoder
Converts strings of only ASCII characters to bytes.
AspectRatio
A widget that attempts to size the child to a specific aspect ratio.
AssetBundle
A collection of resources used by the application.
AssetBundleImageKey
Key for the image obtained by an AssetImage or ExactAssetImage .
AssetBundleImageProvider
A subclass of ImageProvider that knows about AssetBundle s.
AssetImage
Fetches an image from an AssetBundle , having determined the exact image to
use based on the context.
AssetManifest
Contains details about available assets and their variants.
See Resolution-aware image assets
to learn about asset variants and how to declare them.
AssetMetadata
Contains information about an asset.
AsyncSnapshot <T >
Immutable representation of the most recent interaction with an asynchronous
computation.
Autocomplete <T extends Object >
A widget for helping the user make a selection by entering some text and
choosing from among a list of options.
AutocompleteHighlightedOption
An inherited widget used to indicate which autocomplete option should be
highlighted for keyboard navigation.
AutocompleteNextOptionIntent
An Intent to highlight the next option in the autocomplete list.
AutocompletePreviousOptionIntent
An Intent to highlight the previous option in the autocomplete list.
AutofillClient
An object that represents an autofillable input field in the autofill workflow.
AutofillConfiguration
A collection of autofill related information that represents an AutofillClient .
AutofillGroup
An AutofillScope widget that groups AutofillClient s together.
AutofillGroupState
State associated with an AutofillGroup widget.
AutofillHints
A collection of commonly used autofill hint strings on different platforms.
AutofillScope
An ordered group within which AutofillClient s are logically connected.
AutomaticKeepAlive
Allows subtrees to request to be kept alive in lazy lists.
AutomaticNotchedShape
A NotchedShape created from ShapeBorder s.
AutoSizeGroup
AutoSizeGroupBuilder
A Flutter widget that provides an AutoSizeGroup to its builder function.
AutoSizeText
Flutter widget that automatically resizes text to fit perfectly within its
bounds.
BackButton
A Material Design back icon button.
BackButtonDispatcher
Report to a Router when the user taps the back button on platforms that
support back buttons (such as Android).
BackButtonIcon
A "back" icon that's appropriate for the current TargetPlatform .
BackButtonListener
A convenience widget that registers a callback for when the back button is pressed.
BackdropFilter
A widget that applies a filter to the existing painted content and then
paints child .
BackgroundIsolateBinaryMessenger
A BinaryMessenger for use on background (non-root) isolates.
Badge
A Material Design "badge".
BadgeTheme
An inherited widget that overrides the default color style, and size
parameters for Badge s in this widget's subtree.
BadgeThemeData
Overrides the default properties values for descendant Badge widgets.
BallisticScrollActivity
An activity that animates a scroll view based on a physics Simulation .
Banner
Displays a diagonal message above the corner of another widget.
BannerPainter
Paints a Banner .
Base64Codec
A base64 encoder and decoder.
Base64Decoder
Decoder for base64 encoded data.
Base64Encoder
Base64 and base64url encoding converter.
Baseline
A widget that positions its child according to the child's baseline.
BasicMessageChannel <T >
A named channel for communicating with platform plugins using asynchronous
message passing.
BeveledRectangleBorder
A rectangular border with flattened or "beveled" corners.
Bidi
This provides utility methods for working with bidirectional text. All
of the methods are static, and are organized into a class primarily to
group them together for documentation and discoverability.
BidiFormatter
Bidi stands for Bi-directional text. According to
Wikipedia :
Bi-directional text is text containing text in both text directionalities,
both right-to-left (RTL) and left-to-right (LTR). It generally involves text
containing different types of alphabets, but may also refer to
boustrophedon, which is changing text directionality in each row.
BinaryCodec
MessageCodec with unencoded binary messages represented using ByteData .
BinaryMessenger
A messenger which sends binary data across the Flutter platform barrier.
BindingBase
Base class for mixins that provide singleton services.
BitField <T extends dynamic >
A BitField over an enum (or other class whose values implement "index").
Only the first 62 values of the enum can be used as indices.
BlockSemantics
A widget that drops the semantics of all widget that were painted before it
in the same semantic container.
Border
A border of a box, comprised of four sides: top, right, bottom, left.
BorderDirectional
A border of a box, comprised of four sides, the lateral sides of which
flip over based on the reading direction.
BorderRadius
An immutable set of radii for each corner of a rectangle.
BorderRadiusDirectional
An immutable set of radii for each corner of a rectangle, but with the
corners specified in a manner dependent on the writing direction.
BorderRadiusGeometry
Base class for BorderRadius that allows for text-direction aware resolution.
BorderRadiusTween
An interpolation between two BorderRadius s.
BorderSide
A side of a border of a box.
BorderTween
An interpolation between two Border s.
BottomAppBar
A container that is typically used with Scaffold.bottomNavigationBar .
BottomAppBarTheme
Defines default property values for descendant BottomAppBar widgets.
BottomNavigationBar
A material widget that's displayed at the bottom of an app for selecting
among a small number of views, typically between three and five.
BottomNavigationBarItem
An interactive button within either material's BottomNavigationBar
or the iOS themed CupertinoTabBar with an icon and title.
BottomNavigationBarTheme
Applies a bottom navigation bar theme to descendant BottomNavigationBar
widgets.
BottomNavigationBarThemeData
Defines default property values for descendant BottomNavigationBar
widgets.
BottomSheet
A Material Design bottom sheet.
BottomSheetThemeData
Defines default property values for BottomSheet 's Material .
Bounceable
BouncingScrollPhysics
Scroll physics for environments that allow the scroll offset to go beyond
the bounds of the content, but then bounce the content back to the edge of
those bounds.
BouncingScrollSimulation
An implementation of scroll physics that matches iOS.
BoxBorder
Base class for box borders that can paint as rectangles, circles, or rounded
rectangles.
BoxConstraints
Immutable layout constraints for RenderBox layout.
BoxConstraintsTween
An interpolation between two BoxConstraints .
BoxDecoration
An immutable description of how to paint a box.
BoxPainter
A stateful class that can paint a particular Decoration .
BoxScrollView
A ScrollView that uses a single child layout model.
BoxShadow
A shadow cast by a box.
Controls the browser's context menu on the web platform.
BuildContext
A handle to the location of a widget in the widget tree.
Builder
A stateless utility widget whose build method uses its
builder callback to create the widget's child.
BuildOwner
Manager class for the widgets framework.
BuildScope
A class that determines the scope of a BuildOwner.buildScope operation.
ButtonActivateIntent
An Intent that activates the currently focused button.
ButtonBar
An end-aligned row of buttons, laying out into a column if there is not
enough horizontal space.
ButtonBarTheme
Applies a button bar theme to descendant ButtonBar widgets.
ButtonBarThemeData
Defines the visual properties of ButtonBar widgets.
ButtonSegment <T >
Data describing a segment of a SegmentedButton .
ButtonStyle
The visual properties that most buttons have in common.
ButtonStyleButton
The base StatefulWidget class for buttons whose style is defined by a ButtonStyle object.
ButtonTheme
Used with ButtonThemeData to configure the color and geometry of buttons.
ButtonThemeData
Used with ButtonTheme to configure the color and geometry of buttons.
ByteConversionSink
The ByteConversionSink provides an interface for converters to
efficiently transmit byte data.
ByteData
A fixed-length, random-access sequence of bytes that also provides random
and unaligned access to the fixed-width integers and floating point
numbers represented by those bytes.
BytesBuilder
Builds a list of bytes, allowing bytes and lists of bytes to be added at the
end.
BytesLoader
An interface that can be implemented to support decoding vector graphic
binary assets from different byte sources.
Cache
The cache for decoded SVGs.
CachedNetworkImage
Image widget to show NetworkImage with caching functionality.
CachedNetworkImageProvider
IO implementation of the CachedNetworkImageProvider; the ImageProvider to
load network images using a cache.
CachingAssetBundle
An AssetBundle that permanently caches string and structured resources
that have been fetched.
CachingIterable <E >
A lazy caching version of Iterable .
CalendarDatePicker
Displays a grid of days for a given month and allows the user to select a
date.
CallbackAction <T extends Intent >
An Action that takes a callback in order to configure it without having to
create an explicit Action subclass just to call a callback.
CallbackShortcuts
A widget that binds key combinations to specific callbacks.
Canvas
An interface for recording graphical operations.
CapturedThemes
Stores a list of captured InheritedTheme s that can be wrapped around a
child Widget .
Card
A Material Design card: a panel with slightly rounded corners and an
elevation shadow.
CardTheme
Defines default property values for descendant Card widgets.
CardThemeData
Defines default property values for descendant Card widgets.
CarouselController
A controller for CarouselView .
CarouselScrollPhysics
Scroll physics used by a CarouselView .
CarouselView
A Material Design carousel widget.
Category
A category with which to annotate a class, for documentation
purposes.
CatmullRomCurve
An animation easing curve that passes smoothly through the given control
points using a centripetal Catmull-Rom spline.
CatmullRomSpline
A 2D spline that passes smoothly through the given control points using a
centripetal Catmull-Rom spline.
Center
A widget that centers its child within itself.
ChangeNotifier
A class that can be extended or mixed in that provides a change notification
API using VoidCallback for notifications.
ChannelBuffers
The buffering and dispatch mechanism for messages sent by plugins
on the engine side to their corresponding plugin code on the
framework side.
CharacterActivator
A shortcut combination that is triggered by a key event that produces a
specific character.
CharacterBoundary
A TextBoundary subclass for retrieving the range of the grapheme the given
position is in.
CharacterRange
A range of characters of a Characters .
Characters
The characters of a string.
Checkbox
A Material Design checkbox.
CheckboxListTile
A ListTile with a Checkbox . In other words, a checkbox with a label.
A menu item that combines a Checkbox widget with a MenuItemButton .
CheckboxTheme
Applies a checkbox theme to descendant Checkbox widgets.
CheckboxThemeData
Defines default property values for descendant Checkbox widgets.
CheckedModeBanner
Displays a Banner saying "DEBUG" when running in debug mode.
MaterialApp builds one of these by default.
An item with a checkmark in a Material Design popup menu.
CheckmarkableChipAttributes
An interface for Material Design chips that can have check marks.
ChildBackButtonDispatcher
A variant of BackButtonDispatcher which listens to notifications from a
parent back button dispatcher, and can take priority from its parent for the
handling of such notifications.
ChildVicinity
The relative position of a child in a TwoDimensionalViewport in relation
to other children of the viewport.
Chip
A Material Design chip.
ChipAnimationStyle
A helper class that overrides the default chip animation parameters.
ChipAttributes
An interface defining the base attributes for a Material Design chip.
ChipTheme
Applies a chip theme to descendant RawChip -based widgets, like Chip ,
InputChip , ChoiceChip , FilterChip , and ActionChip .
ChipThemeData
Holds the color, shape, and text styles for a Material Design chip theme.
ChoiceChip
A Material Design choice chip.
ChunkedConversionSink <T >
A ChunkedConversionSink is used to transmit data more efficiently between
two converters during chunked conversions.
CircleAvatar
A circle that represents a user.
CircleBorder
A border that fits a circle within the available space.
CircularNotchedRectangle
A rectangle with a smooth circular notch.
CircularProgressIndicator
A Material Design circular progress indicator, which spins to indicate that
the application is busy.
ClampingScrollPhysics
Scroll physics for environments that prevent the scroll offset from reaching
beyond the bounds of the content.
ClampingScrollSimulation
An implementation of scroll physics that aligns with Android.
Clipboard
Utility methods for interacting with the system's clipboard.
ClipboardData
Data stored on the system clipboard.
ClipboardStatusNotifier
A ValueNotifier whose value indicates whether the current contents of
the clipboard can be pasted.
ClipContext
Clip utilities used by PaintingContext .
ClipOval
A widget that clips its child using an oval.
ClipPath
A widget that clips its child using a path.
ClipRect
A widget that clips its child using a rectangle.
ClipRRect
A widget that clips its child using a rounded rectangle.
ClosableStringSink
A ClosableStringSink extends the StringSink interface by adding a
close method.
CloseButton
A Material Design close icon button.
CloseButtonIcon
A "close" icon that's appropriate for the current TargetPlatform .
Codec <S , T >
A Codec encodes and (if supported) decodes data.
Color
An immutable 32 bit color value in ARGB format.
ColoredBox
A widget that paints its area with a specified Color and then draws its
child on top of that color.
ColorFilter
A description of a color filter to apply when drawing a shape or compositing
a layer with a particular Paint . A color filter is a function that takes
two colors, and outputs one color. When applied during compositing, it is
independently applied to each pixel of the layer being drawn before the
entire layer is merged with the destination.
ColorFiltered
Applies a ColorFilter to its child.
ColorMapper
A class that transforms from one color to another during SVG parsing.
ColorProperty
DiagnosticsProperty that has an Color as value.
Colors
Color and ColorSwatch constants which represent Material design's
color palette .
ColorScheme
A set of 45 colors based on the
Material spec
that can be used to configure the color properties of most components.
ColorSwatch <T >
A color that has a small table of related colors called a "swatch".
ColorTween
An interpolation between two colors.
Column
A widget that displays its children in a vertical array.
Completer <T >
A way to produce Future objects and to complete them later
with a value or error.
ComponentElement
An Element that composes other Element s.
CompositedTransformFollower
A widget that follows a CompositedTransformTarget .
CompositedTransformTarget
A widget that can be targeted by a CompositedTransformFollower .
CompoundAnimation <T >
An interface for combining multiple Animations. Subclasses need only
implement the value getter to control how the child animations are
combined. Can be chained to combine more than 2 animations.
CompressionOptions
Options controlling compression in a WebSocket .
ConnectionTask <S >
A cancelable connection attempt.
ConstantTween <T >
A tween with a constant value.
ConstrainedBox
A widget that imposes additional constraints on its child.
ConstrainedLayoutBuilder <ConstraintType extends Constraints >
An abstract superclass for widgets that defer their building until layout.
ConstraintsTransformBox
A container widget that applies an arbitrary transform to its constraints,
and sizes its child using the resulting BoxConstraints , optionally
clipping, or treating the overflow as an error.
Container
A convenience widget that combines common painting, positioning, and sizing
widgets.
ContentInsertionConfiguration
Configures the ability to insert media content through the soft keyboard.
ContentType
A MIME/IANA media type used as the value of the
HttpHeaders.contentTypeHeader header.
ContextAction <T extends Intent >
An abstract Action subclass that adds an optional BuildContext to the
isEnabled and invoke methods to be able to provide context to actions.
The type and callback for a context menu button.
Builds and manages a context menu at a given location.
ContinuousRectangleBorder
A rectangular border with smooth continuous transitions between the straight
sides and the rounded corners.
ControlsDetails
Container for all the information necessary to build a Stepper widget's
forward and backward controls for any given step.
Converter <S , T >
A Converter converts data from one representation into another.
Cookie
Representation of a cookie. For cookies received by the server as Cookie
header values only name and value properties will be set. When building a
cookie for the 'set-cookie' header in the server and when receiving cookies
in the client as 'set-cookie' headers all fields can be used.
CopySelectionTextIntent
An Intent that represents a user interaction that attempts to copy or cut
the current selection in the field.
Cubic
A cubic polynomial mapping of the unit interval.
CupertinoBasedMaterialThemeData
A class for creating a Material theme with a color scheme based off of the
colors from a CupertinoThemeData . This is intended to be used only in the
case when a Material widget is unable to find a Material theme in the tree,
but is able to find a Cupertino theme. Most often this will occur when a
Material widget is used inside of a CupertinoApp .
CupertinoPageTransitionsBuilder
Used by PageTransitionsTheme to define a horizontal MaterialPageRoute
page transition animation that matches native iOS page transitions.
Curve
An parametric animation easing curve, i.e. a mapping of the unit interval to
the unit interval.
Curve2D
Abstract class that defines an API for evaluating 2D parametric curves.
Curve2DSample
A class that holds a sample of a 2D parametric curve, containing the value
(the X, Y coordinates) of the curve at the parametric value t .
CurvedAnimation
An animation that applies a curve to another animation.
Curves
A collection of common animation curves.
CurveTween
Transforms the value of the given animation by the given curve.
CustomClipper <T >
An interface for providing custom clips.
CustomMultiChildLayout
A widget that uses a delegate to size and position multiple children.
CustomPaint
A widget that provides a canvas on which to draw during the paint phase.
CustomPainter
The interface used by CustomPaint (in the widgets library) and
RenderCustomPaint (in the rendering library).
CustomPainterSemantics
Contains properties describing information drawn in a rectangle contained by
the Canvas used by a CustomPaint .
CustomScrollView
A ScrollView that creates custom scroll effects using slivers .
CustomSingleChildLayout
A widget that defers the layout of its single child to a delegate.
DarwinPlatformViewController
Base class for iOS and macOS view controllers.
DataCell
The data for a cell of a DataTable .
DataColumn
Column configuration for a DataTable .
Datagram
A data packet received by a RawDatagramSocket .
DataRow
Row configuration and cell data for a DataTable .
DataTable
A data table that follows the
Material 2
design specification.
DataTableSource
A data source for obtaining row data for PaginatedDataTable objects.
DataTableTheme
Applies a data table theme to descendant DataTable widgets.
DataTableThemeData
Defines default property values for descendant DataTable
widgets.
DateFormat
DateFormat is for formatting and parsing dates in a locale-sensitive
manner.
DateFormatter
DatePickerDialog
A Material-style date picker dialog.
DatePickerTheme
An inherited widget that defines the visual properties for
DatePickerDialog s in this widget's subtree.
DatePickerThemeData
Overrides the default values of visual properties for descendant
DatePickerDialog widgets.
DateRangePickerDialog
A Material-style date range picker dialog.
DateTimeRange
Encapsulates a start and end DateTime that represent the range of dates.
DateUtils
Utility functions for working with dates.
DebugCreator
A wrapper class for the Element that is the creator of a RenderObject .
DecoratedBox
A widget that paints a Decoration either before or after its child paints.
DecoratedBoxTransition
Animated version of a DecoratedBox that animates the different properties
of its Decoration .
DecoratedSliver
A sliver widget that paints a Decoration either before or after its child
paints.
Decoration
A description of a box decoration (a decoration applied to a Rect ).
DecorationImage
An image for a box decoration.
DecorationImagePainter
The painter for a DecorationImage .
DecorationTween
An interpolation between two Decoration s.
DefaultAssetBundle
A widget that determines the default asset bundle for its descendants.
DefaultMaterialLocalizations
US English strings for the material widgets.
The platform menu delegate that handles the built-in macOS platform menu
generation using the 'flutter/menu' channel.
DefaultProcessTextService
The service used by default for the text processing feature.
DefaultSelectionStyle
The selection style to apply to descendant EditableText widgets which
don't have an explicit style.
DefaultSpellCheckService
The service used by default to fetch spell check results for text input.
DefaultSvgTheme
The SVG theme to apply to descendant SvgPicture widgets
which don't have explicit theme values.
DefaultTabController
The TabController for descendant widgets that don't specify one
explicitly.
DefaultTextEditingShortcuts
A widget with the shortcuts used for the default text editing behavior.
DefaultTextHeightBehavior
The TextHeightBehavior that will apply to descendant Text and EditableText
widgets which have not explicitly set Text.textHeightBehavior .
DefaultTextStyle
The text style to apply to descendant Text widgets which don't have an
explicit style.
DefaultTextStyleTransition
Animated version of a DefaultTextStyle that animates the different properties
of its TextStyle .
DefaultTransitionDelegate <T >
The default implementation of TransitionDelegate that the Navigator will
use if its Navigator.transitionDelegate is not specified.
DefaultWidgetsLocalizations
US English localizations for the widgets library.
DeferredComponent
Manages the installation and loading of deferred components.
DeletableChipAttributes
An interface for Material Design chips that can be deleted.
DeleteCharacterIntent
Deletes the character before or after the caret location, based on whether
forward is true.
DeleteToLineBreakIntent
Deletes from the current caret location to the previous or next soft or hard
line break, based on whether forward is true.
DeleteToNextWordBoundaryIntent
Deletes from the current caret location to the previous or next word
boundary, based on whether forward is true.
DesktopTextSelectionControls
Desktop Material styled text selection controls.
DesktopTextSelectionToolbar
A Material-style desktop text selection toolbar.
DesktopTextSelectionToolbarButton
A TextButton for the Material desktop text selection toolbar.
DesktopTextSelectionToolbarLayoutDelegate
Positions the toolbar at anchor if it fits, otherwise moves it so that it
just fits fully on-screen.
DevToolsDeepLinkProperty
Debugging message for DevTools deep links.
DiagnosticableNode <T extends Diagnosticable >
DiagnosticsNode that lazily calls the associated Diagnosticable value
to implement getChildren and getProperties .
DiagnosticableTree
A base class for providing string and DiagnosticsNode debug
representations describing the properties and children of an object.
DiagnosticableTreeNode
DiagnosticsNode for an instance of DiagnosticableTree .
DiagnosticPropertiesBuilder
Builder to accumulate properties and configuration used to assemble a
DiagnosticsNode from a Diagnosticable object.
DiagnosticsBlock
DiagnosticsNode that exists mainly to provide a container for other
diagnostics that typically lacks a meaningful value of its own.
DiagnosticsNode
Defines diagnostics data for a value .
DiagnosticsProperty <T >
Property with a value of type T.
DiagnosticsSerializationDelegate
A delegate that configures how a hierarchy of DiagnosticsNode s should be
serialized.
DiagnosticsStackTrace
Diagnostic with a StackTrace value suitable for displaying stack traces
as part of a FlutterError object.
Dialog
A Material Design dialog.
DialogRoute <T >
A dialog route with Material entrance and exit animations,
modal barrier color, and modal barrier behavior (dialog is dismissible
with a tap on the barrier).
DialogTheme
Defines a theme for Dialog widgets.
DialogThemeData
Defines default property values for descendant Dialog widgets.
DirectionalCaretMovementIntent
A DirectionalTextEditingIntent that moves the caret or the selection to a
new location.
DirectionalFocusAction
An Action that moves the focus to the focusable node in the direction
configured by the associated DirectionalFocusIntent.direction .
DirectionalFocusIntent
An Intent that represents moving to the next focusable node in the given
direction .
Directionality
A widget that determines the ambient directionality of text and
text-direction-sensitive render objects.
DirectionalTextEditingIntent
A text editing related Intent that performs an operation towards a given
direction of the current caret location.
Directory
A reference to a directory (or folder ) on the file system.
DisabledChipAttributes
An interface for Material Design chips that can be enabled and disabled.
DismissAction
An Action that dismisses the focused widget.
Dismissible
A widget that can be dismissed by dragging in the indicated direction .
DismissIntent
An Intent that dismisses the currently focused widget.
An action that closes all the menus associated with the given
MenuController .
DismissUpdateDetails
Details for DismissUpdateCallback .
DisplayFeatureSubScreen
Positions child such that it avoids overlapping any DisplayFeature that
splits the screen into sub-screens.
DisposableBuildContext <T extends State <StatefulWidget >
Provides non-leaking access to a BuildContext .
Divider
A thin horizontal line, with padding on either side.
DividerTheme
An inherited widget that defines the configuration for
Divider s, VerticalDivider s, dividers between ListTile s, and dividers
between rows in DataTable s in this widget's subtree.
DividerThemeData
Defines the visual properties of Divider , VerticalDivider , dividers
between ListTile s, and dividers between rows in DataTable s.
DocumentationIcon
A class annotation to provide a URL to an image that represents the class.
DocumentBoundary
A text boundary that uses the entire document as logical boundary.
DoNothingAction
An Action that doesn't perform any action when invoked.
DoNothingAndStopPropagationIntent
An Intent that is bound to a DoNothingAction , but, in addition to not
performing an action, also stops the propagation of the key event bound to
this intent to other key event handlers in the focus chain.
DoNothingAndStopPropagationTextIntent
An Intent to send the event straight to the engine.
DoNothingIntent
An Intent that is bound to a DoNothingAction .
DoubleProperty
Property describing a double value with an optional unit of measurement.
DownloadProgress
Progress of the file that is being downloaded from the originalUrl.
DragDownDetails
Details object for callbacks that use GestureDragDownCallback .
DragEndDetails
Details object for callbacks that use GestureDragEndCallback .
Draggable <T extends Object >
A widget that can be dragged from to a DragTarget .
DraggableDetails
Represents the details when a specific pointer event occurred on
the Draggable .
DraggableScrollableActuator
A widget that can notify a descendent DraggableScrollableSheet that it
should reset its position to the initial state.
DraggableScrollableController
Controls a DraggableScrollableSheet .
DraggableScrollableNotification
A Notification related to the extent, which is the size, and scroll
offset, which is the position of the child list, of the
DraggableScrollableSheet .
DraggableScrollableSheet
A container for a Scrollable that responds to drag gestures by resizing
the scrollable until a limit is reached, and then scrolling.
DragScrollActivity
The activity a scroll view performs when the user drags their finger
across the screen.
DragStartDetails
Details object for callbacks that use GestureDragStartCallback .
DragTarget <T extends Object >
A widget that receives data when a Draggable widget is dropped.
DragTargetDetails <T >
Represents the details when a pointer event occurred on the DragTarget .
DragUpdateDetails
Details object for callbacks that use GestureDragUpdateCallback .
Drawer
A Material Design panel that slides in horizontally from the edge of a
Scaffold to show navigation links in an application.
DrawerButton
A Material Design drawer icon button.
DrawerButtonIcon
A "drawer" icon that's appropriate for the current TargetPlatform .
DrawerController
Provides interactive behavior for Drawer widgets.
DrawerControllerState
State for a DrawerController .
The top-most region of a Material Design drawer. The header's child
widget, if any, is placed inside a Container whose decoration can be
passed as an argument, inset by the given padding .
DrawerTheme
An inherited widget that defines visual properties for Drawer s in this
widget's subtree.
DrawerThemeData
Defines default property values for descendant Drawer widgets.
DrivenScrollActivity
An activity that animates a scroll view based on animation parameters.
DropdownButton <T >
A Material Design button for selecting from a list of items.
DropdownButtonFormField <T >
A FormField that contains a DropdownButton .
DropdownButtonHideUnderline
An inherited widget that causes any descendant DropdownButton
widgets to not include their regular underline.
A dropdown menu that can be opened from a TextField . The selected
menu item is displayed in that field.
Defines a DropdownMenu menu button that represents one item view in the menu.
An item in a menu created by a DropdownButton .
An inherited widget that defines the visual properties for DropdownMenu s in this widget's subtree.
Overrides the default values of visual properties for descendant DropdownMenu widgets.
DropSliderValueIndicatorShape
The default shape of a Material 3 Slider 's value indicator.
DualTransitionBuilder
A transition builder that animates its child based on the
AnimationStatus of the provided animation .
Durations
The set of durations in the Material specification.
Easing
The set of easing curves in the Material specification.
EdgeDraggingAutoScroller
An auto scroller that scrolls the scrollable if a drag gesture drags close
to its edge.
EdgeInsets
An immutable set of offsets in each of the four cardinal directions.
EdgeInsetsDirectional
An immutable set of offsets in each of the four cardinal directions, but
whose horizontal components are dependent on the writing direction.
EdgeInsetsGeometry
Base class for EdgeInsets that allows for text-direction aware
resolution.
EdgeInsetsGeometryTween
An interpolation between two EdgeInsetsGeometry s.
EdgeInsetsTween
An interpolation between two EdgeInsets s.
EditableText
A basic text input field.
EditableTextState
State for an EditableText .
ElasticInCurve
An oscillating curve that grows in magnitude while overshooting its bounds.
ElasticInOutCurve
An oscillating curve that grows and then shrinks in magnitude while
overshooting its bounds.
ElasticOutCurve
An oscillating curve that shrinks in magnitude while overshooting its bounds.
Element
An instantiation of a Widget at a particular location in the tree.
ElevatedButton
A Material Design "elevated button".
ElevatedButtonTheme
Overrides the default ButtonStyle of its ElevatedButton descendants.
ElevatedButtonThemeData
A ButtonStyle that overrides the default appearance of
ElevatedButton s when it's used with ElevatedButtonTheme or with the
overall Theme 's ThemeData.elevatedButtonTheme .
ElevationOverlay
A utility class for dealing with the overlay color needed
to indicate elevation of surfaces.
EmptyTextSelectionControls
Text selection controls that do not show any toolbars or handles.
Encoding
Open-ended set of encodings.
EndDrawerButton
A Material Design end drawer icon button.
EndDrawerButtonIcon
A "end drawer" icon that's appropriate for the current TargetPlatform .
Endian
Endianness of number representation.
EnumProperty <T extends Enum ? >
DiagnosticsProperty that has an Enum as value.
ErrorDescription
An explanation of the problem and its cause, any information that may help
track down the problem, background information, etc.
ErrorHint
An ErrorHint provides specific, non-obvious advice that may be applicable.
ErrorSpacer
An ErrorSpacer creates an empty DiagnosticsNode , that can be used to
tune the spacing between other DiagnosticsNode objects.
ErrorSummary
A short (one line) description of the problem that was detected.
ErrorWidget
A widget that renders an exception's message.
EventChannel
A named channel for communicating with platform plugins using event streams.
EventSink <T >
A Sink that supports adding errors.
ExactAssetImage
Fetches an image from an AssetBundle , associating it with the given scale.
ExcludeFocus
A widget that controls whether or not the descendants of this widget are
focusable.
ExcludeFocusTraversal
A widget that controls whether or not the descendants of this widget are
traversable.
ExcludeSemantics
A widget that drops all the semantics of its descendants.
Expanded
A widget that expands a child of a Row , Column , or Flex
so that the child fills the available space.
ExpandIcon
A widget representing a rotating expand/collapse button. The icon rotates
180 degrees when pressed, then reverts the animation on a second press.
The underlying icon is Icons.expand_more .
ExpandSelectionToDocumentBoundaryIntent
Expands the current selection to the document boundary in the direction
given by forward .
ExpandSelectionToLineBreakIntent
Expands the current selection to the closest line break in the direction
given by forward .
ExpansionPanel
A material expansion panel. It has a header and a body and can be either
expanded or collapsed. The body of the panel is only visible when it is
expanded.
ExpansionPanelList
A material expansion panel list that lays out its children and animates
expansions.
ExpansionPanelRadio
An expansion panel that allows for radio-like functionality.
This means that at any given time, at most, one ExpansionPanelRadio
can remain expanded.
ExpansionTile
A single-line ListTile with an expansion arrow icon that expands or collapses
the tile to reveal or hide the children .
ExpansionTileController
Enables control over a single ExpansionTile 's expanded/collapsed state.
ExpansionTileTheme
Overrides the default ExpansionTileTheme of its ExpansionTile descendants.
ExpansionTileThemeData
Used with ExpansionTileTheme to define default property values for
descendant ExpansionTile widgets.
ExpensiveAndroidViewController
Controls an Android view that is composed using the Android view hierarchy.
This controller is created from the PlatformViewsService.initExpensiveAndroidView factory.
ExtendSelectionByCharacterIntent
Extends, or moves the current selection from the current
TextSelection.extent position to the previous or the next character
boundary.
ExtendSelectionByPageIntent
Scrolls up or down by page depending on the forward parameter.
Extends the selection up or down by page based on the forward parameter.
ExtendSelectionToDocumentBoundaryIntent
Extends, or moves the current selection from the current
TextSelection.extent position to the start or the end of the document.
ExtendSelectionToLineBreakIntent
Extends, or moves the current selection from the current
TextSelection.extent position to the closest line break in the direction
given by forward .
ExtendSelectionToNextParagraphBoundaryIntent
Extends, or moves the current selection from the current
TextSelection.extent position to the previous or the next paragraph
boundary.
ExtendSelectionToNextParagraphBoundaryOrCaretLocationIntent
Extends, or moves the current selection from the current
TextSelection.extent position to the previous or the next paragraph
boundary depending on the forward parameter.
ExtendSelectionToNextWordBoundaryIntent
Extends, or moves the current selection from the current
TextSelection.extent position to the previous or the next word
boundary.
ExtendSelectionToNextWordBoundaryOrCaretLocationIntent
Extends, or moves the current selection from the current
TextSelection.extent position to the previous or the next word
boundary, or the TextSelection.base position if it's closer in the move
direction.
ExtendSelectionVerticallyToAdjacentLineIntent
Extends, or moves the current selection from the current
TextSelection.extent position to the closest position on the adjacent
line.
ExtendSelectionVerticallyToAdjacentPageIntent
Expands, or moves the current selection from the current
TextSelection.extent position to the closest position on the adjacent
page.
Factory <T >
A factory interface that also reports the type of the created objects.
FadeInImage
An image that shows a placeholder image while the target image is
loading, then fades in the new image when it loads.
FadeTransition
Animates the opacity of a widget.
FadeUpwardsPageTransitionsBuilder
Used by PageTransitionsTheme to define a vertically fading
MaterialPageRoute page transition animation that looks like
the default page transition used on Android O.
Feedback
Provides platform-specific acoustic and/or haptic feedback for certain
actions.
File
A reference to a file on the file system.
FileImage
Decodes the given File object as an image, associating it with the given
scale.
FileLock
Type of lock when requesting a lock on a file.
FileMode
The modes in which a File can be opened.
FileStat
The result of calling the POSIX stat() function on a file system object.
FileSystemCreateEvent
File system event for newly created file system objects.
FileSystemDeleteEvent
File system event for deletion of file system objects.
FileSystemEntity
The common superclass of File , Directory , and Link .
FileSystemEntityType
The type of an entity on the file system,
such as a file, directory, or link.
FileSystemEvent
Base event class emitted by FileSystemEntity.watch .
FileSystemModifyEvent
File system event for modifications of file system objects.
FileSystemMoveEvent
File system event for moving of file system objects.
FilledButton
A Material Design filled button.
FilledButtonTheme
Overrides the default ButtonStyle of its FilledButton descendants.
FilledButtonThemeData
A ButtonStyle that overrides the default appearance of
FilledButton s when it's used with FilledButtonTheme or with the
overall Theme 's ThemeData.filledButtonTheme .
FilterChip
A Material Design filter chip.
FilteringTextInputFormatter
A TextInputFormatter that prevents the insertion of characters matching
(or not matching) a particular pattern, by replacing the characters with the
given replacementString .
FittedBox
Scales and positions its child within itself according to fit .
FittedSizes
The pair of sizes returned by applyBoxFit .
FixedColumnWidth
Sizes the column to a specific number of pixels.
FixedExtentMetrics
Metrics for a ScrollPosition to a scroll view with fixed item sizes.
FixedExtentScrollController
A controller for scroll views whose items have the same size.
FixedExtentScrollPhysics
A snapping physics that always lands directly on items instead of anywhere
within the scroll extent.
FixedScrollMetrics
An immutable snapshot of values associated with a Scrollable viewport.
FlagProperty
Property where the description is either ifTrue or ifFalse depending on
whether value is true or false.
FlagsSummary <T >
A summary of multiple properties, indicating whether each of them is present
(non-null) or absent (null).
Flex
A widget that displays its children in a one-dimensional array.
FlexColumnWidth
Sizes the column by taking a part of the remaining space once all
the other columns have been laid out.
Flexible
A widget that controls how a child of a Row , Column , or Flex flexes.
FlexibleSpaceBar
The part of a Material Design AppBar that expands, collapses, and
stretches.
FlexibleSpaceBarSettings
Provides sizing and opacity information to a FlexibleSpaceBar .
FlippedCurve
A curve that is the reversed inversion of its given curve.
FlippedTweenSequence
Enables creating a flipped Animation whose value is defined by a sequence
of Tween s.
Float32List
A fixed-length list of IEEE 754 single-precision binary floating-point
numbers that is viewable as a TypedData .
Float64List
A fixed-length list of IEEE 754 double-precision binary floating-point
numbers that is viewable as a TypedData .
FloatingActionButton
A Material Design floating action button.
FloatingActionButtonAnimator
Provider of animations to move the FloatingActionButton between FloatingActionButtonLocation s.
FloatingActionButtonLocation
An object that defines a position for the FloatingActionButton
based on the Scaffold 's ScaffoldPrelayoutGeometry .
FloatingActionButtonThemeData
Defines default property values for descendant FloatingActionButton
widgets.
FloatingLabelAlignment
Defines where the floating label should be displayed within an
InputDecorator .
Flow
A widget that sizes and positions children efficiently, according to the
logic in a FlowDelegate .
FlowDelegate
A delegate that controls the appearance of a flow layout.
FlowPaintingContext
A context in which a FlowDelegate paints.
FlutterErrorDetails
Class for information provided to FlutterExceptionHandler callbacks.
FlutterLogo
The Flutter logo, in widget form. This widget respects the IconTheme .
For guidelines on using the Flutter logo, visit https://flutter.dev/brand .
FlutterLogoDecoration
An immutable description of how to paint Flutter's logo.
FlutterMemoryAllocations
An interface for listening to object lifecycle events.
FlutterTimeline
Measures how long blocks of code take to run.
Focus
A widget that manages a FocusNode to allow keyboard focus to be given
to this widget and its descendants.
FocusableActionDetector
A widget that combines the functionality of Actions , Shortcuts ,
MouseRegion and a Focus widget to create a detector that defines actions
and key bindings, and provides callbacks for handling focus and hover
highlights.
FocusAttachment
An attachment point for a FocusNode .
FocusManager
Manages the focus tree.
FocusNode
An object that can be used by a stateful widget to obtain the keyboard focus
and to handle keyboard events.
FocusOrder
Base class for all sort orders for OrderedTraversalPolicy traversal.
FocusScope
A FocusScope is similar to a Focus , but also serves as a scope for its
descendants, restricting focus traversal to the scoped controls.
FocusScopeNode
A subclass of FocusNode that acts as a scope for its descendants,
maintaining information about which descendant is currently or was last
focused.
FocusTraversalGroup
A widget that describes the inherited focus policy for focus traversal for
its descendants, grouping them into a separate traversal group.
FocusTraversalOrder
An inherited widget that describes the order in which its child subtree
should be traversed.
FocusTraversalPolicy
Determines how focusable widgets are traversed within a FocusTraversalGroup .
FontFeature
A feature tag and value that affect the selection of glyphs in a font.
FontLoader
A class that enables the dynamic loading of fonts at runtime.
FontSizeResolvers
FontVariation
An axis tag and value that can be used to customize variable fonts.
FontWeight
The thickness of the glyphs used to draw the text.
ForcePressDetails
Details object for callbacks that use GestureForcePressStartCallback ,
GestureForcePressPeakCallback , GestureForcePressEndCallback or
GestureForcePressUpdateCallback .
Form
An optional container for grouping together multiple form field widgets
(e.g. TextField widgets).
FormField <T >
A single form field.
FormFieldState <T >
The current state of a FormField . Passed to the FormFieldBuilder method
for use in constructing the form field's widget.
FormState
State associated with a Form widget.
FractionallySizedBox
A widget that sizes its child to a fraction of the total available space.
For more details about the layout algorithm, see
RenderFractionallySizedOverflowBox .
FractionalOffset
An offset that's expressed as a fraction of a Size .
FractionalOffsetTween
An interpolation between two fractional offsets.
FractionalTranslation
Applies a translation transformation before painting its child.
FractionColumnWidth
Sizes the column to a fraction of the table's constraints' maxWidth.
Future <T >
The result of an asynchronous computation.
FutureBuilder <T >
A widget that builds itself based on the latest snapshot of interaction with
a Future .
FutureOr <T >
A type representing values that are either Future<T> or T.
GestureDetector
A widget that detects gestures.
GestureRecognizerFactory <T extends GestureRecognizer >
Factory for creating gesture recognizers.
GestureRecognizerFactoryWithHandlers <T extends GestureRecognizer >
Factory for creating gesture recognizers that delegates to callbacks.
GLFWKeyHelper
Helper class that uses GLFW-specific key mappings.
GlobalKey <T extends State <StatefulWidget >
A key that is unique across the entire app.
GlobalObjectKey <T extends State <StatefulWidget >
A global key that takes its identity from the object used as its value.
GlowingOverscrollIndicator
A visual indication that a scroll view has overscrolled.
GlyphInfo
The measurements of a character (or a sequence of visually connected
characters) within a paragraph.
Gradient
A 2D gradient.
GradientRotation
A GradientTransform that rotates the gradient around the center-point of
its bounding box.
GradientTransform
Base class for transforming gradient shaders without applying the same
transform to the entire canvas.
GridPaper
A widget that draws a rectilinear grid of lines one pixel wide.
GridTile
A tile in a Material Design grid list.
GridTileBar
A header used in a Material Design GridTile .
GridView
A scrollable, 2D array of widgets.
GtkKeyHelper
Helper class that uses GTK-specific key mappings.
GZipCodec
The GZipCodec encodes raw bytes to GZip compressed bytes and decodes GZip
compressed bytes to raw bytes.
HapticFeedback
Allows access to the haptic feedback interface on the device.
HardwareKeyboard
Manages key events from hardware keyboards.
HashedObserverList <T >
A list optimized for the observer pattern, but for larger numbers of observers.
Representation of a header value in the form:
Hero
A widget that marks its child as being a candidate for
hero animations .
HeroController
A Navigator observer that manages Hero transitions.
HeroControllerScope
An inherited widget to host a hero controller.
HeroMode
Enables or disables Hero es in the widget subtree.
HoldScrollActivity
A scroll activity that does nothing but can be released to resume
normal idle behavior.
HSLColor
A color represented using alpha , hue , saturation , and lightness .
HSVColor
A color represented using alpha , hue , saturation , and value .
HtmlElementView
Embeds an HTML element in the Widget hierarchy in Flutter web.
HtmlEscape
Converter which escapes characters with special meaning in HTML.
HtmlEscapeMode
HTML escape modes.
HttpClient
An HTTP client for communicating with an HTTP server.
HttpClientBasicCredentials
Represents credentials for basic authentication.
HttpClientCredentials
HttpClientDigestCredentials
Represents credentials for digest authentication. Digest
authentication is only supported for servers using the MD5
algorithm and quality of protection (qop) of either "none" or
"auth".
HttpClientRequest
HTTP request for a client connection.
HttpClientResponse
HTTP response for a client connection.
HttpConnectionInfo
Information about an HttpRequest , HttpResponse , HttpClientRequest , or
HttpClientResponse connection.
HttpConnectionsInfo
Summary statistics about an HttpServer s current socket connections.
HttpDate
Utility functions for working with dates with HTTP specific date
formats.
Headers for HTTP requests and responses.
HttpOverrides
This class facilitates overriding HttpClient with a mock implementation.
It should be extended by another class in client code with overrides
that construct a mock implementation. The implementation in this base class
defaults to the actual HttpClient implementation. For example:
HttpRequest
A server-side object
that contains the content of and information about an HTTP request.
HttpResponse
An HTTP response, which returns the headers and data
from the server to the client in response to an HTTP request.
HttpServer
A server that delivers content, such as web pages, using the HTTP protocol.
HttpSession
The HttpRequest.session of an HttpRequest .
HttpStatus
HTTP status codes. Exported in dart:io and dart:html.
Icon
A graphical icon widget drawn with a glyph from a font described in
an IconData such as material's predefined IconData s in Icons .
IconButton
A Material Design icon button.
IconButtonTheme
Overrides the default ButtonStyle of its IconButton descendants.
IconButtonThemeData
A ButtonStyle that overrides the default appearance of
IconButton s when it's used with the IconButton , the IconButtonTheme or the
overall Theme 's ThemeData.iconButtonTheme .
IconData
A description of an icon fulfilled by a font glyph.
IconDataProperty
DiagnosticsProperty that has an IconData as value.
Icons
Identifiers for the supported Material Icons .
IconTheme
Controls the default properties of icons in a widget subtree.
IconThemeData
Defines the size, font variations, color, opacity, and shadows of icons.
IdleScrollActivity
A scroll activity that does nothing.
IgnoreBaseline
A widget that causes the parent to ignore the child for the purposes
of baseline alignment.
IgnorePointer
A widget that is invisible during hit testing.
Image
A widget that displays an image.
ImageCache
Class for caching images.
ImageCacheStatus
Information about how the ImageCache is tracking an image.
ImageChunkEvent
An immutable notification of image bytes that have been incrementally loaded.
ImageConfiguration
Configuration information passed to the ImageProvider.resolve method to
select a specific image.
ImageFiltered
Applies an ImageFilter to its child.
ImageIcon
An icon that comes from an ImageProvider , e.g. an AssetImage .
ImageInfo
A dart:ui.Image object with its corresponding scale.
ImageProvider <T extends Object >
Identifies an image without committing to the precise final asset. This
allows a set of images to be identified and for the precise image to later
be resolved based on the environment, e.g. the device pixel ratio.
ImageShader
A shader (as used by Paint.shader ) that tiles an image.
ImageSizeInfo
Tracks the bytes used by a dart:ui.Image compared to the bytes needed to
paint that image without scaling it.
ImageStream
A handle to an image resource.
ImageStreamCompleter
Base class for those that manage the loading of dart:ui.Image objects for
ImageStream s.
ImageStreamCompleterHandle
An opaque handle that keeps an ImageStreamCompleter alive even if it has
lost its last listener.
ImageStreamListener
Interface for receiving notifications about the loading of an image.
ImmutableBuffer
A handle to a read-only byte buffer that is managed by the engine.
ImplicitlyAnimatedWidget
An abstract class for building widgets that animate changes to their
properties.
ImplicitlyAnimatedWidgetState <T extends ImplicitlyAnimatedWidget >
A base class for the State of widgets with implicit animations.
IndexedSemantics
A widget that annotates the child semantics with an index.
IndexedSlot <T extends Element ? >
A value for Element.slot used for children of
MultiChildRenderObjectElement s.
IndexedStack
A Stack that shows a single child from a list of children.
InheritedElement
An Element that uses an InheritedWidget as its configuration.
InheritedModel <T >
An InheritedWidget that's intended to be used as the base class for models
whose dependents may only depend on one part or "aspect" of the overall
model.
InheritedModelElement <T >
An Element that uses a InheritedModel as its configuration.
InheritedNotifier <T extends Listenable >
An inherited widget for a Listenable notifier , which updates its
dependencies when the notifier is triggered.
InheritedTheme
An InheritedWidget that defines visual properties like colors
and text styles, which the child 's subtree depends on.
InheritedWidget
Base class for widgets that efficiently propagate information down the tree.
Ink
A convenience widget for drawing images and other decorations on Material
widgets, so that InkWell and InkResponse splashes will render over them.
InkDecoration
A decoration on a part of a Material .
InkFeature
A visual reaction on a piece of Material .
InkHighlight
A visual emphasis on a part of a Material receiving user interaction.
InkResponse
An area of a Material that responds to touch. Has a configurable shape and
can be configured to clip splashes that extend outside its bounds or not.
InkRipple
A visual reaction on a piece of Material to user input.
InkSparkle
Begin a Material 3 ink sparkle ripple, centered at the tap or click position
relative to the referenceBox .
InkSplash
A visual reaction on a piece of Material to user input.
InkWell
A rectangular area of a Material that responds to touch.
InlineSpan
An immutable span of inline content which forms part of a paragraph.
InlineSpanSemanticsInformation
The textual and semantic label information for an InlineSpan .
InputBorder
Defines the appearance of an InputDecorator 's border.
InputChip
A Material Design input chip.
InputDatePickerFormField
A TextFormField configured to accept and validate a date entered by a user.
InputDecoration
The border, labels, icons, and styles used to decorate a Material
Design text field.
InputDecorationTheme
Defines the default appearance of InputDecorator s.
InputDecorator
Defines the appearance of a Material Design text field.
InspectorReferenceData
Structure to help reference count Dart objects referenced by a GUI tool
using WidgetInspectorService .
InspectorSelection
Mutable selection state of the inspector.
InspectorSerializationDelegate
A delegate that configures how a hierarchy of DiagnosticsNode s are
serialized by the Flutter Inspector.
Int32List
A fixed-length list of 32-bit signed integers that is viewable as a
TypedData .
Int64List
A fixed-length list of 64-bit signed integers that is viewable as a
TypedData .
Intent
An abstract class representing a particular configuration of an Action .
InteractiveInkFeature
An ink feature that displays a color "splash" in response to a user
gesture that can be confirmed or canceled.
InteractiveInkFeatureFactory
An encapsulation of an InteractiveInkFeature constructor used by
InkWell , InkResponse , and ThemeData .
InteractiveViewer
A widget that enables pan and zoom interactions with its child.
InternetAddress
An internet address or a Unix domain address.
InternetAddressType
The type, or address family, of an InternetAddress .
Interval
A curve that is 0.0 until begin , then curved (according to curve ) from
0.0 at begin to 1.0 at end , then remains 1.0 past end .
Intl
The Intl class provides a common entry point for internationalization
related tasks. An Intl instance can be created for a particular locale
and used to create a date format via anIntl.date(). Static methods
on this class are also used in message formatting.
IntProperty
An int valued property with an optional unit the value is measured in.
IntrinsicColumnWidth
Sizes the column according to the intrinsic dimensions of all the
cells in that column.
IntrinsicHeight
A widget that sizes its child to the child's intrinsic height.
IntrinsicWidth
A widget that sizes its child to the child's maximum intrinsic width.
IntTween
An interpolation between two integers that rounds.
IOOverrides
Facilities for overriding various APIs of dart:io with mock
implementations.
IOSink
A combined byte and text output.
IterableProperty <T >
Property with an Iterable<T> value that can be displayed with
different DiagnosticsTreeStyle for custom rendering.
JsonCodec
A JsonCodec encodes JSON objects to strings and decodes strings to
JSON objects.
JsonDecoder
This class parses JSON strings and builds the corresponding objects.
JsonEncoder
This class converts JSON objects to strings.
JSONMessageCodec
MessageCodec with UTF-8 encoded JSON messages.
JSONMethodCodec
MethodCodec with UTF-8 encoded JSON method calls and result envelopes.
JsonUtf8Encoder
Encoder that encodes a single object as a UTF-8 encoded JSON string.
KeepAlive
Mark a child as needing to stay alive even when it's in a lazy list that
would otherwise remove it.
KeepAliveHandle
A Listenable which can be manually triggered.
KeepAliveNotification
Indicates that the subtree through which this notification bubbles must be
kept alive even if it would normally be discarded as an optimization.
Key
A Key is an identifier for Widget s, Element s and SemanticsNode s.
KeyboardInsertedContent
A class representing rich content (such as a PNG image) inserted via the
system input method.
KeyboardKey
A base class for all keyboard key types.
KeyboardListener
A widget that calls a callback whenever the user presses or releases a key
on a keyboard.
KeyData
Information about a key event.
KeyDownEvent
An event indicating that the user has pressed a key down on the keyboard.
KeyedSubtree
A widget that builds its child.
KeyEvent
Defines the interface for keyboard key events.
KeyEventManager
A singleton class that processes key messages from the platform and
dispatches converted messages accordingly.
KeyHelper
Abstract class for window-specific key mappings.
KeyMessage
The assembled information converted from a native key message.
KeyRepeatEvent
An event indicating that the user has been holding a key on the keyboard
and causing repeated events.
KeySet <T extends KeyboardKey >
A set of KeyboardKey s that can be used as the keys in a Map .
KeyUpEvent
An event indicating that the user has released a key on the keyboard.
LabeledGlobalKey <T extends State <StatefulWidget >
A global key with a debugging label.
Latin1Codec
A Latin1Codec encodes strings to ISO Latin-1 (aka ISO-8859-1) bytes
and decodes Latin-1 bytes to strings.
Latin1Decoder
This class converts Latin-1 bytes (lists of unsigned 8-bit integers)
to a string.
Latin1Encoder
This class converts strings of only ISO Latin-1 characters to bytes.
LayerLink
An object that a LeaderLayer can register with.
LayoutBuilder
Builds a widget tree that can depend on the parent widget's size.
LayoutChangedNotification
Indicates that the layout of one of the descendants of the object receiving
this notification has changed in some way, and that therefore any
assumptions about that layout are no longer valid.
LayoutId
Metadata for identifying children in a CustomMultiChildLayout .
LeafRenderObjectElement
An Element that uses a LeafRenderObjectWidget as its configuration.
LeafRenderObjectWidget
A superclass for RenderObjectWidget s that configure RenderObject subclasses
that have no children.
LengthLimitingTextInputFormatter
A TextInputFormatter that prevents the insertion of more characters
than allowed.
LexicalFocusOrder
Can be given to a FocusTraversalOrder widget to use a String to assign a
lexical order to a widget subtree that is using a
OrderedTraversalPolicy to define the order in which widgets should be
traversed with the keyboard.
LicenseEntry
A license that covers part of the application's software or assets, to show
in an interface such as the LicensePage .
LicenseEntryWithLineBreaks
Variant of LicenseEntry for licenses that separate paragraphs with blank
lines and that hard-wrap text within paragraphs. Lines that begin with one
or more space characters are also assumed to introduce new paragraphs,
unless they start with the same number of spaces as the previous line, in
which case it's assumed they are a continuation of an indented paragraph.
LicensePage
A page that shows licenses for software used by the application.
LicenseParagraph
A string that represents one paragraph in a LicenseEntry .
LicenseRegistry
A registry for packages to add licenses to, so that they can be displayed
together in an interface such as the LicensePage .
LimitedBox
A box that limits its size only when it's unconstrained.
LinearBorder
An OutlinedBorder like BoxBorder that allows one to define a rectangular (box) border
in terms of zero to four LinearBorderEdge s, each of which is rendered as a single line.
LinearBorderEdge
Defines the relative size and alignment of one LinearBorder edge.
LinearGradient
A 2D linear gradient.
LinearProgressIndicator
A Material Design linear progress indicator, also known as a progress bar.
LineBoundary
A TextBoundary subclass for locating closest line breaks to a given
position.
LineMetrics
LineMetrics stores the measurements and statistics of a single line in the
paragraph.
LineSplitter
A StreamTransformer that splits a String into individual lines.
Link
References to filesystem links.
ListBody
A widget that arranges its children sequentially along a given axis, forcing
them to the dimension of the parent in the other axis.
Listenable
An object that maintains a list of listeners.
ListenableBuilder
A general-purpose widget for building a widget subtree when a Listenable
changes.
Listener
A widget that calls callbacks in response to common pointer events.
ListTile
A single fixed-height row that typically contains some text as well as
a leading or trailing icon.
ListTileTheme
An inherited widget that defines color and style parameters for ListTile s
in this widget's subtree.
ListTileThemeData
Used with ListTileTheme to define default property values for
descendant ListTile widgets, as well as classes that build
ListTile s, like CheckboxListTile , RadioListTile , and
SwitchListTile .
ListView
A scrollable list of widgets arranged linearly.
ListWheelChildBuilderDelegate
A delegate that supplies children for ListWheelScrollView using a builder
callback.
ListWheelChildDelegate
A delegate that supplies children for ListWheelScrollView .
ListWheelChildListDelegate
A delegate that supplies children for ListWheelScrollView using an
explicit list.
ListWheelChildLoopingListDelegate
A delegate that supplies infinite children for ListWheelScrollView by
looping an explicit list.
ListWheelElement
Element that supports building children lazily for ListWheelViewport .
ListWheelScrollView
A box in which children on a wheel can be scrolled.
ListWheelViewport
A viewport showing a subset of children on a wheel.
LiveText
Utility methods for interacting with the system's Live Text.
LiveTextInputStatusNotifier
A ValueNotifier whose value indicates whether the current device supports the Live Text
(OCR) function.
Locale
An identifier used to select a user's language and formatting preferences.
LocalHistoryEntry
An entry in the history of a LocalHistoryRoute .
Localizations
Defines the Locale for its child and the localized resources that the
child depends on.
LocalizationsDelegate <T >
A factory for a set of localized resources of type T, to be loaded by a
Localizations widget.
LocalKey
A key that is not a GlobalKey .
LogicalKeyboardKey
A class with static values that describe the keys that are returned from
RawKeyEvent.logicalKey .
LogicalKeySet
A set of LogicalKeyboardKey s that can be used as the keys in a map.
LongPressDraggable <T extends Object >
Makes its child draggable starting from long press.
LongPressEndDetails
Details for callbacks that use GestureLongPressEndCallback .
LongPressMoveUpdateDetails
Details for callbacks that use GestureLongPressMoveUpdateCallback .
LongPressStartDetails
Details for callbacks that use GestureLongPressStartCallback .
LookupBoundary
A lookup boundary controls what entities are visible to descendants of the
boundary via the static lookup methods provided by the boundary.
Magnifier
A Material-styled magnifying glass.
MagnifierController
A controller for a magnifier.
MagnifierDecoration
The decorations to put around the loupe in a RawMagnifier .
MagnifierInfo
A data class that contains the geometry information of text layouts
and selection gestures, used to position magnifiers.
MaskFilter
A mask filter to apply to shapes as they are painted. A mask filter is a
function that takes a bitmap of color pixels, and returns another bitmap of
color pixels.
Material
A piece of material.
MaterialAccentColor
Defines a single accent color as well a swatch of four shades of the
accent color.
MaterialApp
An application that uses Material Design.
MaterialBanner
A Material Design banner.
MaterialBannerTheme
An inherited widget that defines the configuration for
MaterialBanner s in this widget's subtree.
MaterialBannerThemeData
Defines the visual properties of MaterialBanner widgets.
MaterialBasedCupertinoThemeData
A CupertinoThemeData that defers unspecified theme attributes to an
upstream Material ThemeData .
MaterialButton
A utility class for building Material buttons that depend on the
ambient ButtonTheme and Theme .
MaterialColor
Defines a single color as well a color swatch with ten shades of the color.
MaterialGap
A class that represents a gap within MergeableMaterial .
MaterialInkController
An interface for creating InkSplash s and InkHighlight s on a Material .
MaterialLocalizations
Defines the localized resource values used by the Material widgets.
MaterialPage <T >
A page that creates a material style PageRoute .
A modal route that replaces the entire screen with a platform-adaptive
transition.
MaterialPointArcTween
A Tween that interpolates an Offset along a circular arc.
MaterialRectArcTween
A Tween that interpolates a Rect by having its opposite corners follow
circular arcs.
MaterialRectCenterArcTween
A Tween that interpolates a Rect by moving it along a circular arc from
begin 's Rect.center to end 's Rect.center while interpolating the
rectangle's width and height.
MaterialScrollBehavior
Describes how Scrollable widgets behave for MaterialApp s.
MaterialSlice
A class that can be used as a child to MergeableMaterial . It is a slice
of Material that animates merging with other slices.
MaterialStateOutlineInputBorder
Defines a OutlineInputBorder that is also a MaterialStateProperty .
MaterialStateUnderlineInputBorder
Defines a UnderlineInputBorder that is also a MaterialStateProperty .
MaterialTextSelectionControls
Android Material styled text selection controls.
MaterialTextSelectionHandleControls
Android Material styled text selection handle controls.
Matrix4
4D Matrix.
Values are stored in column major order.
Matrix4Tween
An interpolation between two Matrix4 s.
MatrixTransition
Animates the Matrix4 of a transformed widget.
MatrixUtils
Utility functions for working with matrices.
MaxColumnWidth
Sizes the column such that it is the size that is the maximum of
two column width specifications.
MediaQuery
Establishes a subtree in which media queries resolve to the given data.
MediaQueryData
Information about a piece of media (e.g., a window).
MemoryImage
Decodes the given Uint8List buffer as an image, associating it with the
given scale.
An InheritedWidget that provides a descendant MenuAcceleratorLabel with
the function to invoke when the accelerator is pressed.
A widget that draws the label text for a menu item (typically a
MenuItemButton or SubmenuButton ) and renders its child with information
about the currently active keyboard accelerator.
A widget used to mark the "anchor" for a set of submenus, defining the
rectangle used to position the menu, which can be done either with an
explicit location, or with an alignment.
A menu bar that manages cascading child menus.
An inherited widget that defines the configuration for the MenuBar widgets
in this widget's descendants.
A data class that MenuBarTheme uses to define the visual properties of
MenuBar widgets.
Overrides the default ButtonStyle of its MenuItemButton and
SubmenuButton descendants.
A ButtonStyle theme that overrides the default appearance of
SubmenuButton s and MenuItemButton s when it's used with a
MenuButtonTheme or with the overall Theme 's ThemeData.menuTheme .
A controller to manage a menu created by a MenuBar or MenuAnchor .
A button for use in a MenuBar , in a menu created with MenuAnchor , or on
its own, that can be activated by click or keyboard navigation.
The visual properties that menus have in common.
An inherited widget that defines the configuration in this widget's
descendants for menus created by the SubmenuButton , MenuBar , or
MenuAnchor widgets.
Defines the configuration of the submenus created by the SubmenuButton ,
MenuBar , or MenuAnchor widgets.
MergeableMaterial
Displays a list of MergeableMaterialItem children. The list contains
MaterialSlice items whose boundaries are either "merged" with adjacent
items or separated by a MaterialGap . The children are distributed along
the given mainAxis in the same way as the children of a ListBody . When
the list of children changes, gaps are automatically animated open or closed
as needed.
MergeableMaterialItem
The base type for MaterialSlice and MaterialGap .
MergeSemantics
A widget that merges the semantics of its descendants.
MessageCodec <T >
A message encoding/decoding mechanism.
MessageProperty
Debugging message displayed like a property.
MetaData
Holds opaque meta data in the render tree.
MethodCall
A command object representing the invocation of a named method.
MethodChannel
A named channel for communicating with platform plugins using asynchronous
method calls.
MethodCodec
A codec for method calls and enveloped results.
MicroMoney
Used primarily for currency formatting, this number-like class stores
millionths of a currency unit, typically as an Int64.
MinColumnWidth
Sizes the column such that it is the size that is the minimum of
two column width specifications.
ModalBarrier
A widget that prevents the user from interacting with widgets behind itself.
ModalBottomSheetRoute <T >
A route that represents a Material Design modal bottom sheet.
ModalRoute <T >
A route that blocks interaction with previous routes.
MouseCursor
An interface for mouse cursor definitions.
MouseCursorManager
Maintains the state of mouse cursors and manages how cursors are searched
for.
MouseCursorSession
Manages the duration that a pointing device should display a specific mouse
cursor.
MouseRegion
A widget that tracks the movement of mice.
MouseTrackerAnnotation
The annotation object used to annotate regions that are interested in mouse
movements.
MultiChildLayoutDelegate
A delegate that controls the layout of multiple children.
MultiChildRenderObjectElement
An Element that uses a MultiChildRenderObjectWidget as its configuration.
MultiChildRenderObjectWidget
A superclass for RenderObjectWidget s that configure RenderObject subclasses
that have a single list of children. (This superclass only provides the
storage for that child list, it doesn't actually provide the updating
logic.)
MultiFrameImageStreamCompleter
Manages the decoding and scheduling of image frames.
MultiImageStreamCompleter
An ImageStreamCompleter with support for loading multiple images.
MultiSelectableSelectionContainerDelegate
A delegate that handles events and updates for multiple Selectable
children.
MultiStreamController <T >
An enhanced stream controller provided by Stream.multi .
NavigationBar
Material 3 Navigation Bar component.
NavigationBarTheme
An inherited widget that defines visual properties for NavigationBar s and
NavigationDestination s in this widget's subtree.
NavigationBarThemeData
Defines default property values for descendant NavigationBar
widgets.
NavigationDestination
A Material 3 NavigationBar destination.
NavigationDrawer
Material Design Navigation Drawer component.
NavigationDrawerDestination
A Material Design NavigationDrawer destination.
NavigationDrawerTheme
An inherited widget that defines visual properties for NavigationDrawer s and
NavigationDestination s in this widget's subtree.
NavigationDrawerThemeData
Defines default property values for descendant NavigationDrawer
widgets.
NavigationIndicator
Selection Indicator for the Material 3 NavigationBar and NavigationRail
components.
NavigationNotification
A notification that a change in navigation has taken place.
NavigationRail
A Material Design widget that is meant to be displayed at the left or right of an
app to navigate between a small number of views, typically between three and
five.
NavigationRailDestination
Defines a NavigationRail button that represents one "destination" view.
NavigationRailTheme
An inherited widget that defines visual properties for NavigationRail s and
NavigationRailDestination s in this widget's subtree.
NavigationRailThemeData
Defines default property values for descendant NavigationRail
widgets.
NavigationToolbar
NavigationToolbar is a layout helper to position 3 widgets or groups of
widgets along a horizontal axis that's sensible for an application's
navigation bar such as in Material Design and in iOS.
Navigator
A widget that manages a set of child widgets with a stack discipline.
NavigatorObserver
An interface for observing the behavior of a Navigator .
NavigatorPopHandler <T >
Enables the handling of system back gestures.
NavigatorState
The state for a Navigator widget.
NestedScrollView
A scrolling view inside of which can be nested other scrolling views, with
their scroll positions being intrinsically linked.
NestedScrollViewState
The State for a NestedScrollView .
NestedScrollViewViewport
The Viewport variant used by NestedScrollView .
NetworkAssetBundle
An AssetBundle that loads resources over the network.
NetworkImage
Fetches the given URL from the network, associating it with the given scale.
NetworkInterface
A NetworkInterface represents an active network interface on the current
system. It contains a list of InternetAddress es that are bound to the
interface.
NeverScrollableScrollPhysics
Scroll physics that does not allow the user to scroll.
NextFocusAction
An Action that moves the focus to the next focusable node in the focus
order.
NextFocusIntent
An Intent bound to NextFocusAction , which moves the focus to the next
focusable node in the focus traversal order.
NoSplash
An InteractiveInkFeature that doesn't paint a splash.
NotchedShape
A shape with a notch in its outline.
Notification
A notification that can bubble up the widget tree.
NotificationListener <T extends Notification >
A widget that listens for Notification s bubbling up the tree.
NumberFormat
Provides the ability to format a number in a locale-specific way.
NumberParserBase <R >
NumericFocusOrder
Can be given to a FocusTraversalOrder widget to assign a numerical order
to a widget subtree that is using a OrderedTraversalPolicy to define the
order in which widgets should be traversed with the keyboard.
ObjectCreated
An event that describes creation of an object.
ObjectDisposed
An event that describes disposal of an object.
ObjectEvent
A lifecycle event of an object.
ObjectFlagProperty <T >
A property where the important diagnostic information is primarily whether
the value is present (non-null) or absent (null), rather than the actual
value of the property itself.
ObjectKey
A key that takes its identity from the object used as its value.
ObserverList <T >
A list optimized for the observer pattern when there are small numbers of
observers.
Offset
An immutable 2D floating-point offset.
Offstage
A widget that lays the child out as if it was in the tree, but without
painting anything, without making the child available for hit testing, and
without taking any room in the parent.
OneFrameImageStreamCompleter
Manages the loading of dart:ui.Image objects for static ImageStream s (those
with only one frame).
Opacity
A widget that makes its child partially transparent.
OpenUpwardsPageTransitionsBuilder
Used by PageTransitionsTheme to define a vertical MaterialPageRoute page
transition animation that looks like the default page transition
used on Android P.
OptionalMethodChannel
A MethodChannel that ignores missing platform plugins.
OrderedTraversalPolicy
A FocusTraversalPolicy that orders nodes by an explicit order that resides
in the nearest FocusTraversalOrder widget ancestor.
OrientationBuilder
Builds a widget tree that can depend on the parent widget's orientation
(distinct from the device orientation).
OutlinedBorder
A ShapeBorder that draws an outline with the width and color specified
by side .
OutlinedButton
A Material Design "Outlined Button"; essentially a TextButton
with an outlined border.
OutlinedButtonTheme
Overrides the default ButtonStyle of its OutlinedButton descendants.
OutlinedButtonThemeData
A ButtonStyle that overrides the default appearance of
OutlinedButton s when it's used with OutlinedButtonTheme or with the
overall Theme 's ThemeData.outlinedButtonTheme .
OutlineInputBorder
Draws a rounded rectangle around an InputDecorator 's container.
OvalBorder
A border that fits an elliptical shape.
OverflowBar
A widget that lays out its children in a row unless they
"overflow" the available horizontal space, in which case it lays
them out in a column instead.
OverflowBox
A widget that imposes different constraints on its child than it gets
from its parent, possibly allowing the child to overflow the parent.
Overlay
A stack of entries that can be managed independently.
OverlayEntry
A place in an Overlay that can contain a widget.
OverlayPortal
A widget that renders its overlay child on an Overlay .
OverlayPortalController
A class to show, hide and bring to top an OverlayPortal 's overlay child
in the target Overlay .
OverlayRoute <T >
A route that displays widgets in the Navigator 's Overlay .
OverlayState
The current state of an Overlay .
OverscrollIndicatorNotification
A notification that either a GlowingOverscrollIndicator or a
StretchingOverscrollIndicator will start showing an overscroll indication.
OverscrollNotification
A notification that a Scrollable widget has not changed its scroll position
because the change would have caused its scroll position to go outside of
its scroll bounds.
Padding
A widget that insets its child by the given padding.
PaddleRangeSliderValueIndicatorShape
A variant shape of a RangeSlider 's value indicators. The value indicator
is in the shape of an upside-down pear.
PaddleSliderValueIndicatorShape
A variant shape of a Slider 's value indicator . The value indicator is in
the shape of an upside-down pear.
Page <T >
Describes the configuration of a Route .
PageController
A controller for PageView .
PageMetrics
Metrics for a PageView .
A modal route that replaces the entire screen.
A utility class for defining one-off page routes in terms of callbacks.
PageScrollPhysics
Scroll physics used by a PageView .
PageStorage
Establish a subtree in which widgets can opt into persisting states after
being destroyed.
PageStorageBucket
A storage bucket associated with a page in an app.
PageStorageKey <T >
A Key that can be used to persist the widget state in storage after the
destruction and will be restored when recreated.
PageTransitionsBuilder
Used by PageTransitionsTheme to define a MaterialPageRoute page
transition animation.
PageTransitionsTheme
Defines the page transition animations used by MaterialPageRoute
for different TargetPlatform s.
PageView
A scrollable list that works page by page.
PaginatedDataTable
A table that follows the
Material 2
design specification, using multiple pages to display data.
PaginatedDataTableState
Holds the state of a PaginatedDataTable .
Paint
A description of the style to use when drawing on a Canvas .
PaintingContext
A place to paint.
ParagraphBoundary
A text boundary that uses paragraphs as logical boundaries.
ParametricCurve <T >
An abstract class providing an interface for evaluating a parametric curve.
ParentDataElement <T extends ParentData >
An Element that uses a ParentDataWidget as its configuration.
ParentDataWidget <T extends ParentData >
Base class for widgets that hook ParentData information to children of
RenderObjectWidget s.
PartialStackFrame
Partial information from a stack frame for stack filtering purposes.
PasteTextIntent
An Intent to paste text from Clipboard to the field.
Path
A complex, one-dimensional subset of a plane.
PercentProperty
Property which clamps a double to between 0 and 1 and formats it as a
percentage.
PerformanceOverlay
Displays performance statistics.
PersistentBottomSheetController
A ScaffoldFeatureController for standard bottom sheets.
PersistentHashMap <K extends Object , V >
A collection of key/value pairs which provides efficient retrieval of
value by key.
PhysicalKeyboardKey
A class with static values that describe the keys that are returned from
RawKeyEvent.physicalKey .
PhysicalModel
A widget representing a physical layer that clips its children to a shape.
PhysicalShape
A widget representing a physical layer that clips its children to a path.
PictureInfo
The deocded result of a vector graphics asset.
PictureProvider
Deprecated class, will be removed, does not do anything.
A sliver that keeps its Widget child at the top of the a CustomScrollView .
Pipe
An anonymous pipe that can be used to send data in a single direction i.e.
data written to write can be read using read .
Placeholder
A widget that draws a box that represents where other widgets will one day
be added.
PlaceholderDimensions
Holds the Size and baseline required to represent the dimensions of
a placeholder in text.
PlaceholderSpan
An immutable placeholder that is embedded inline within text.
Platform
Information about the environment in which the current program is running.
PlatformAdaptiveIcons
A set of platform-adaptive Material Design icons.
PlatformAssetBundle
An AssetBundle that loads resources using platform messages.
PlatformDispatcher
Platform event dispatcher singleton.
A class for representing menu items that have child submenus.
A menu bar that uses the platform's native APIs to construct and render a
menu described by a PlatformMenu /PlatformMenuItem hierarchy.
An abstract delegate class that can be used to set
WidgetsBinding.platformMenuDelegate to provide for managing platform
menus.
A class for PlatformMenuItem s that do not have submenus (as a PlatformMenu
would), but can be selected.
A class that groups other menu items into sections delineated by dividers.
A class that represents a menu item that is provided by the platform.
PlatformRouteInformationProvider
The route information provider that propagates the platform route information changes.
A widget that provides native selection context menu for its child subtree.
PlatformViewController
An interface for controlling a single platform view.
PlatformViewCreationParams
The parameters used to create a PlatformViewController .
PlatformViewLink
Links a platform view with the Flutter framework.
PlatformViewsRegistry
A registry responsible for generating unique identifier for platform views.
PlatformViewsService
Provides access to the platform views service.
PlatformViewSurface
Integrates a platform view with Flutter's compositor, touch, and semantics subsystems.
PointerCancelEvent
The input from the pointer is no longer directed towards this receiver.
PointerDownEvent
The pointer has made contact with the device.
PointerEnterEvent
The pointer has moved with respect to the device while the pointer is or is
not in contact with the device, and it has entered a target object.
PointerEvent
Base class for touch, stylus, or mouse events.
PointerExitEvent
The pointer has moved with respect to the device while the pointer is or is
not in contact with the device, and exited a target object.
PointerHoverEvent
The pointer has moved with respect to the device while the pointer is not
in contact with the device.
PointerMoveEvent
The pointer has moved with respect to the device while the pointer is in
contact with the device.
PointerUpEvent
The pointer has stopped making contact with the device.
PopEntry <T >
Allows listening to and preventing pops.
PopScope <T >
Manages back navigation gestures.
Displays a menu when pressed and calls onSelected when the menu is dismissed
because an item was selected. The value passed to onSelected is the value of
the selected menu item.
The State for a PopupMenuButton .
A horizontal divider in a Material Design popup menu.
A base class for entries in a Material Design popup menu.
An item in a Material Design popup menu.
The State for PopupMenuItem subclasses.
An inherited widget that defines the configuration for
popup menus in this widget's subtree.
Defines the visual properties of the routes used to display popup menus
as well as PopupMenuItem and PopupMenuDivider widgets.
A modal route that overlays a widget over the current route.
Positioned
A widget that controls where a child of a Stack is positioned.
PositionedDirectional
A widget that controls where a child of a Stack is positioned without
committing to a specific TextDirection .
PositionedTransition
Animated version of Positioned which takes a specific
Animation<RelativeRect> to transition the child's position from a start
position to an end position over the lifetime of the animation.
PredictiveBackEvent
Object used to report back gesture progress in Android.
PredictiveBackPageTransitionsBuilder
Used by PageTransitionsTheme to define a MaterialPageRoute page
transition animation that looks like the default page transition used on
Android U and above when using predictive back.
PredictiveBackRoute
An interface for a route that supports predictive back gestures.
PreferredSize
A widget with a preferred size.
PreferredSizeWidget
An interface for widgets that can return the size this widget would prefer
if it were otherwise unconstrained.
PreviousFocusAction
An Action that moves the focus to the previous focusable node in the focus
order.
PreviousFocusIntent
An Intent bound to PreviousFocusAction , which moves the focus to the
previous focusable node in the focus traversal order.
PrimaryButtonStyle
PrimaryScrollController
Associates a ScrollController with a subtree.
PrioritizedAction
An Action that iterates through a list of Intent s, invoking the first
that is enabled.
PrioritizedIntents
An Intent that evaluates a series of specified orderedIntents for
execution.
Process
The means to execute a program.
ProcessInfo
Methods for retrieving information about the current process.
ProcessResult
The result of running a non-interactive
process started with Process.run or Process.runSync .
ProcessSignal
On Posix systems, ProcessSignal is used to send a specific signal
to a child process, see Process.kill.
ProcessStartMode
Modes for running a new process.
ProcessTextAction
A data structure describing text processing actions.
ProcessTextService
Determines how to interact with the text processing feature.
ProgressIndicator
A base class for Material Design progress indicators.
ProgressIndicatorTheme
An inherited widget that defines the configuration for
ProgressIndicator s in this widget's subtree.
ProgressIndicatorThemeData
Defines the visual properties of ProgressIndicator widgets.
ProxyAnimation
An animation that is a proxy for another animation.
ProxyElement
An Element that uses a ProxyWidget as its configuration.
ProxyWidget
A widget that has a child widget provided to it, instead of building a new
widget.
RadialGradient
A 2D radial gradient.
Radio <T >
A Material Design radio button.
RadioListTile <T >
A ListTile with a Radio . In other words, a radio button with a label.
A menu item that combines a Radio widget with a MenuItemButton .
RadioTheme
Applies a radio theme to descendant Radio widgets.
RadioThemeData
Defines default property values for descendant Radio widgets.
Radius
A radius for either circular or elliptical shapes.
RandomAccessFile
Random access to the data in a file.
RangeLabels
Object for setting range slider label values that appear in the value
indicator for each thumb.
RangeMaintainingScrollPhysics
Scroll physics that attempt to keep the scroll position in range when the
contents change dimensions suddenly.
RangeSlider
A Material Design range slider.
RangeSliderThumbShape
Base class for RangeSlider thumb shapes.
RangeSliderTickMarkShape
Base class for RangeSlider tick mark shapes.
RangeSliderTrackShape
Base class for RangeSlider track shapes.
RangeSliderValueIndicatorShape
Base class for RangeSlider value indicator shapes.
RangeValues
Object for representing range slider thumb values.
RawAutocomplete <T extends Object >
A widget for helping the user make a selection by entering some text and
choosing from among a list of options.
RawChip
A raw Material Design chip.
RawDatagramSocket
An unbuffered interface to a UDP socket.
RawDialogRoute <T >
A general dialog route which allows for customization of the dialog popup.
RawFloatingCursorPoint
The current state and position of the floating cursor.
RawGestureDetector
A widget that detects gestures described by the given gesture
factories.
RawGestureDetectorState
State for a RawGestureDetector .
RawImage
A widget that displays a dart:ui.Image directly.
RawKeyboard
An interface for listening to raw key events.
RawKeyboardListener
A widget that calls a callback whenever the user presses or releases a key
on a keyboard.
RawKeyDownEvent
The user has pressed a key on the keyboard.
RawKeyEvent
Defines the interface for raw key events.
RawKeyEventData
Base class for platform-specific key event data.
RawKeyEventDataAndroid
Platform-specific key event data for Android.
RawKeyEventDataFuchsia
Platform-specific key event data for Fuchsia.
RawKeyEventDataIos
Platform-specific key event data for iOS.
RawKeyEventDataLinux
Platform-specific key event data for Linux.
RawKeyEventDataMacOs
Platform-specific key event data for macOS.
RawKeyEventDataWeb
Platform-specific key event data for Web.
RawKeyEventDataWindows
Platform-specific key event data for Windows.
RawKeyUpEvent
The user has released a key on the keyboard.
RawMagnifier
A common base class for magnifiers.
RawMaterialButton
Creates a button based on Semantics , Material , and InkWell
widgets.
RawScrollbar
An extendable base class for building scrollbars that fade in and out.
RawScrollbarState <T extends RawScrollbar >
The state for a RawScrollbar widget, also shared by the Scrollbar and
CupertinoScrollbar widgets.
RawSecureServerSocket
A server socket providing a stream of low-level RawSecureSocket s.
RawSecureSocket
RawSecureSocket provides a secure (SSL or TLS) network connection.
RawServerSocket
A listening socket.
RawSocket
A TCP connection.
RawSocketEvent
Events for the RawDatagramSocket , RawSecureSocket , and RawSocket .
RawSocketOption
The RawSocketOption is used as a parameter to Socket.setRawOption and
RawSocket.setRawOption to customize the behaviour of the underlying
socket.
RawSynchronousSocket
A low-level class for communicating synchronously over a TCP socket.
RawView
The lower level workhorse widget for View that bootstraps a render tree
for a view.
RawZLibFilter
The RawZLibFilter class provides a low-level interface to zlib.
ReadBuffer
Read-only buffer for reading sequentially from a ByteData instance.
ReadingOrderTraversalPolicy
Traverses the focus order in "reading order".
ReadPipe
The "read" end of an Pipe created by Pipe.create .
RebuildFactors
Rect
An immutable, 2D, axis-aligned, floating-point rectangle whose coordinates
are relative to a given origin.
RectangularRangeSliderTrackShape
A RangeSlider track that's a simple rectangle.
RectangularRangeSliderValueIndicatorShape
The default shape of a RangeSlider 's value indicators.
RectangularSliderTrackShape
A Slider track that's a simple rectangle.
RectangularSliderValueIndicatorShape
The default shape of a Slider 's value indicator.
RectTween
An interpolation between two rectangles.
REdgeInsets
REdgeInsetsDirectional
RedirectInfo
Redirect information.
RedoTextIntent
An Intent that represents a user interaction that attempts to go back to
the previous editing state.
RefreshIndicator
A widget that supports the Material "swipe to refresh" idiom.
RefreshIndicatorState
Contains the state for a RefreshIndicator . This class can be used to
programmatically show the refresh indicator, see the show method.
RefreshProgressIndicator
An indicator for the progress of refreshing the contents of a widget.
RelativePositionedTransition
Animated version of Positioned which transitions the child's position
based on the value of rect relative to a bounding box with the
specified size .
RelativeRect
An immutable 2D, axis-aligned, floating-point rectangle whose coordinates
are given relative to another rectangle's edges, known as the container.
Since the dimensions of the rectangle are relative to those of the
container, this class has no width and height members. To determine the
width or height of the rectangle, convert it to a Rect using toRect()
(passing the container's own Rect), and then examine that object.
RelativeRectTween
An interpolation between two relative rects.
RenderBox
A render object in a 2D Cartesian coordinate system.
RenderNestedScrollViewViewport
The RenderViewport variant used by NestedScrollView .
RenderObject
An object in the render tree.
RenderObjectElement
An Element that uses a RenderObjectWidget as its configuration.
RenderObjectToWidgetAdapter <T extends RenderObject >
A bridge from a RenderObject to an Element tree.
RenderObjectToWidgetElement <T extends RenderObject >
The root of an element tree that is hosted by a RenderObject .
RenderObjectWidget
RenderObjectWidget s provide the configuration for RenderObjectElement s,
which wrap RenderObject s, which provide the actual rendering of the
application.
RenderSemanticsGestureHandler
Listens for the specified gestures from the semantics server (e.g.
an accessibility tool).
RenderSliverOverlapAbsorber
A sliver that wraps another, forcing its layout extent to be treated as
overlap.
RenderSliverOverlapInjector
A sliver that has a sliver geometry based on the values stored in a
SliverOverlapAbsorberHandle .
RenderTapRegion
A render object that defines a region that can detect taps inside or outside
of itself and any group of regions it belongs to, without participating in
the gesture
disambiguation system.
RenderTapRegionSurface
A render object that provides notification of a tap inside or outside of a
set of registered regions, without participating in the gesture
disambiguation system
(other than to consume tap down events if TapRegion.consumeOutsideTaps is
true).
RenderTreeRootElement
A RenderObjectElement used to manage the root of a render tree.
RenderTwoDimensionalViewport
A base class for viewing render objects that scroll in two dimensions.
ReorderableDelayedDragStartListener
A wrapper widget that will recognize the start of a drag operation by
looking for a long press event. Once it is recognized, it will start
a drag operation on the wrapped item in the reorderable list.
ReorderableDragStartListener
A wrapper widget that will recognize the start of a drag on the wrapped
widget by a PointerDownEvent , and immediately initiate dragging the
wrapped item to a new location in a reorderable list.
ReorderableList
A scrolling container that allows the user to interactively reorder the
list items.
ReorderableListState
The state for a list that allows the user to interactively reorder
the list items.
ReorderableListView
A list whose items the user can interactively reorder by dragging.
RepaintBoundary
A widget that creates a separate display list for its child.
RepetitiveStackFrameFilter
A StackFilter that filters based on repeating lists of
PartialStackFrame s.
ReplaceTextIntent
An Intent that represents a user interaction that attempts to modify the
current TextEditingValue in an input field.
RequestFocusAction
An Action that requests the focus on the node it is given in its
RequestFocusIntent .
RequestFocusIntent
An intent for use with the RequestFocusAction , which supplies the
FocusNode that should be focused.
ResizeImage
Instructs Flutter to decode the image at the specified dimensions
instead of at its native size.
ResizeImageKey
Key used internally by ResizeImage .
ResourceHandle
A wrapper around OS resource handle so it can be passed via Socket
as part of SocketMessage .
RestorableBool
A RestorableProperty that knows how to store and restore a bool .
RestorableBoolN
A RestorableProperty that knows how to store and restore a bool that is
nullable.
RestorableChangeNotifier <T extends ChangeNotifier >
A base class for creating a RestorableProperty that stores and restores a
ChangeNotifier .
RestorableDateTime
A RestorableValue that knows how to save and restore DateTime .
RestorableDateTimeN
A RestorableValue that knows how to save and restore DateTime that is
nullable.
RestorableDouble
A RestorableProperty that knows how to store and restore a double .
RestorableDoubleN
A RestorableProperty that knows how to store and restore a double
that is nullable.
RestorableEnum <T extends Enum >
A RestorableProperty that knows how to store and restore an Enum
type.
RestorableEnumN <T extends Enum >
A RestorableProperty that knows how to store and restore a nullable Enum
type.
RestorableInt
A RestorableProperty that knows how to store and restore an int .
RestorableIntN
A RestorableProperty that knows how to store and restore an int
that is nullable.
RestorableListenable <T extends Listenable >
A base class for creating a RestorableProperty that stores and restores a
Listenable .
RestorableNum <T extends num >
A RestorableProperty that knows how to store and restore a num .
RestorableNumN <T extends num ? >
A RestorableProperty that knows how to store and restore a num
that is nullable.
RestorableProperty <T >
Manages an object of type T, whose value a State object wants to have
restored during state restoration.
RestorableRouteFuture <T >
Gives access to a Route object and its return value that was added to a
navigator via one of its "restorable" API methods.
RestorableString
A RestorableProperty that knows how to store and restore a String .
RestorableStringN
A RestorableProperty that knows how to store and restore a String
that is nullable.
RestorableTextEditingController
A RestorableProperty that knows how to store and restore a
TextEditingController .
RestorableTimeOfDay
A RestorableValue that knows how to save and restore TimeOfDay .
RestorableValue <T >
A RestorableProperty that makes the wrapped value accessible to the owning
State object via the value getter and setter.
RestorationBucket
A RestorationBucket holds pieces of the restoration data that a part of
the application needs to restore its state.
RestorationManager
Manages the restoration data in the framework and synchronizes it with the
engine.
RestorationScope
Creates a new scope for restoration IDs used by descendant widgets to claim
RestorationBucket s.
ReverseAnimation
An animation that is the reverse of another animation.
ReverseTween <T extends Object ? >
A Tween that evaluates its parent in reverse.
RichText
A paragraph of rich text.
RootBackButtonDispatcher
The default implementation of back button dispatcher for the root router.
RootElement
The root of the element tree.
RootIsolateToken
A token that represents a root isolate.
RootRenderObjectElement
Deprecated. Unused in the framework and will be removed in a future version
of Flutter.
RootRestorationScope
Inserts a child bucket of RestorationManager.rootBucket into the widget
tree and makes it available to descendants via RestorationScope.of .
RootWidget
A widget for the root of the widget tree.
RotatedBox
A widget that rotates its child by a integral number of quarter turns.
RotationTransition
Animates the rotation of a widget.
RoundedRectangleBorder
A rectangular border with rounded corners.
RoundedRectRangeSliderTrackShape
The default shape of a RangeSlider 's track.
RoundedRectSliderTrackShape
The default shape of a Slider 's track.
RoundRangeSliderThumbShape
The default shape of a RangeSlider 's thumbs.
RoundRangeSliderTickMarkShape
The default shape of each RangeSlider tick mark.
RoundSliderOverlayShape
The default shape of a Slider 's thumb overlay.
RoundSliderThumbShape
The default shape of a Slider 's thumb.
RoundSliderTickMarkShape
The default shape of each Slider tick mark.
Route <T >
An abstraction for an entry managed by a Navigator .
RouteAware
An interface for objects that are aware of their current Route .
RouteInformation
A piece of routing information.
RouteInformationParser <T >
A delegate that is used by the Router widget to parse a route information
into a configuration of type T.
RouteInformationProvider
A route information provider that provides route information for the
Router widget
RouteObserver <R extends Route >
A Navigator observer that notifies RouteAware s of changes to the
state of their Route .
Router <T >
The dispatcher for opening and closing pages of an application.
RouterConfig <T >
A convenient bundle to configure a Router widget.
RouterDelegate <T >
A delegate that is used by the Router widget to build and configure a
navigating widget.
RouteSettings
Data that might be useful in constructing a Route .
RouteTransitionRecord
A Route wrapper interface that can be staged for TransitionDelegate to
decide how its underlying Route should transition on or off screen.
Row
A widget that displays its children in a horizontal array.
RPadding
RRect
An immutable rounded rectangle with the custom radii for all four corners.
RSizedBox
RSTransform
A transform consisting of a translation, a rotation, and a uniform scale.
SafeArea
A widget that insets its child by sufficient padding to avoid intrusions by
the operating system.
SameSite
Cookie cross-site availability configuration.
SawTooth
A sawtooth curve that repeats a given number of times over the unit interval.
Scaffold
Implements the basic Material Design visual layout structure.
ScaffoldFeatureController <T extends Widget , U >
An interface for controlling a feature of a Scaffold .
ScaffoldGeometry
Geometry information for Scaffold components after layout is finished.
ScaffoldMessenger
Manages SnackBar s and MaterialBanner s for descendant Scaffold s.
ScaffoldMessengerState
State for a ScaffoldMessenger .
ScaffoldPrelayoutGeometry
The geometry of the Scaffold after all its contents have been laid out
except the FloatingActionButton .
ScaffoldState
State for a Scaffold .
ScaleEndDetails
Details for GestureScaleEndCallback .
ScaleStartDetails
Details for GestureScaleStartCallback .
ScaleTransition
Animates the scale of a transformed widget.
ScaleUpdateDetails
Details for GestureScaleUpdateCallback .
ScreenUtil
ScreenUtilInit
ScribbleClient
An interface to receive focus from the engine.
Scrollable
A widget that manages scrolling in one dimension and informs the Viewport
through which the content is viewed.
ScrollableDetails
Describes the aspects of a Scrollable widget to inform inherited widgets
like ScrollBehavior for decorating or enumerate the properties of combined
Scrollables, such as TwoDimensionalScrollable .
ScrollableState
State object for a Scrollable widget.
ScrollAction
An Action that scrolls the relevant Scrollable by the amount configured
in the ScrollIntent given to it.
ScrollActivity
Base class for scrolling activities like dragging and flinging.
ScrollActivityDelegate
A backend for a ScrollActivity .
ScrollAwareImageProvider <T extends Object >
An ImageProvider that makes use of
Scrollable.recommendDeferredLoadingForContext to avoid loading images when
rapidly scrolling.
Scrollbar
A Material Design scrollbar.
ScrollbarPainter
Paints a scrollbar's track and thumb.
ScrollbarTheme
Applies a scrollbar theme to descendant Scrollbar widgets.
ScrollbarThemeData
Defines default property values for descendant Scrollbar widgets.
ScrollBehavior
Describes how Scrollable widgets should behave.
ScrollConfiguration
Controls how Scrollable widgets behave in a subtree.
ScrollContext
An interface that Scrollable widgets implement in order to use
ScrollPosition .
ScrollController
Controls a scrollable widget.
ScrollDragController
Scrolls a scroll view as the user drags their finger across the screen.
ScrollEndNotification
A notification that a Scrollable widget has stopped scrolling.
ScrollHoldController
Interface for holding a Scrollable stationary.
ScrollIncrementDetails
A details object that describes the type of scroll increment being requested
of a ScrollIncrementCalculator function, as well as the current metrics
for the scrollable.
ScrollIntent
An Intent that represents scrolling the nearest scrollable by an amount
appropriate for the type specified.
ScrollMetricsNotification
A notification that a scrollable widget's ScrollMetrics have changed.
ScrollNotification
A Notification related to scrolling.
ScrollNotificationObserver
Notifies its listeners when a descendant scrolls.
ScrollNotificationObserverState
The listener list state for a ScrollNotificationObserver returned by
ScrollNotificationObserver.of .
ScrollPhysics
Determines the physics of a Scrollable widget.
ScrollPosition
Determines which portion of the content is visible in a scroll view.
ScrollPositionWithSingleContext
A scroll position that manages scroll activities for a single
ScrollContext .
ScrollSpringSimulation
A SpringSimulation where the value of x is guaranteed to have exactly the
end value when the simulation isDone .
ScrollStartNotification
A notification that a Scrollable widget has started scrolling.
ScrollToDocumentBoundaryIntent
Scrolls to the beginning or end of the document depending on the forward
parameter.
ScrollUpdateNotification
A notification that a Scrollable widget has changed its scroll position.
ScrollView
A widget that combines a Scrollable and a Viewport to create an
interactive scrolling pane of content in one dimension.
SearchAnchor
Manages a "search view" route that allows the user to select one of the
suggested completions for a search query.
SearchBar
A Material Design search bar.
SearchBarTheme
Applies a search bar theme to descendant SearchBar widgets.
SearchBarThemeData
Defines default property values for descendant SearchBar widgets.
SearchController
A controller to manage a search view created by SearchAnchor .
SearchDelegate <T >
Delegate for showSearch to define the content of the search page.
SearchViewTheme
An inherited widget that defines the configuration in this widget's
descendants for search view created by the SearchAnchor widget.
SearchViewThemeData
Defines the configuration of the search views created by the SearchAnchor
widget.
SecureServerSocket
A server socket, providing a stream of high-level Socket s.
SecureSocket
A TCP socket using TLS and SSL.
SecurityContext
The object containing the certificates to trust when making
a secure client connection, and the certificate chain and
private key to serve from a secure server.
SegmentedButton <T >
A Material button that allows the user to select from limited set of options.
SegmentedButtonState <T >
State for SegmentedButton .
SegmentedButtonTheme
An inherited widget that defines the visual properties for
SegmentedButton s in this widget's subtree.
SegmentedButtonThemeData
Overrides the default values of visual properties for descendant
SegmentedButton widgets.
SelectableChipAttributes
An interface for Material Design chips that can be selected.
SelectableRegion
A widget that introduces an area for user selections.
SelectableRegionState
State for a SelectableRegion .
SelectableText
A run of selectable text with a single style.
SelectAction
An action that selects the currently focused control.
SelectAllTextIntent
An Intent to select everything in the field.
SelectIntent
An Intent that selects the currently focused control.
SelectionArea
A widget that introduces an area for user selections with adaptive selection
controls.
SelectionAreaState
State for a SelectionArea .
SelectionContainer
A container that handles SelectionEvent s for the Selectable s in
the subtree.
SelectionContainerDelegate
A delegate to handle SelectionEvent s for a SelectionContainer .
SelectionOverlay
An object that manages a pair of selection handles and a toolbar.
SelectionRect
Represents a selection rect for a character and it's position in the text.
SelectionRegistrarScope
An inherited widget to host a SelectionRegistrar for the subtree.
Semantics
A widget that annotates the widget tree with a description of the meaning of
the widgets.
SemanticsDebugger
A widget that visualizes the semantics for the child.
SemanticsGestureDelegate
A base class that describes what semantics notations a RawGestureDetector
should add to the render object RenderSemanticsGestureHandler .
ServerSocket
A listening socket.
Shader
Base class for objects such as Gradient and ImageShader which
correspond to shaders as used by Paint.shader .
ShaderMask
A widget that applies a mask generated by a Shader to its child.
ShaderWarmUp
Interface for drawing an image to warm up Skia shader compilations.
Shadow
A single shadow.
ShapeBorder
Base class for shape outlines.
ShapeBorderClipper
A CustomClipper that clips to the outer path of a ShapeBorder .
ShapeBorderTween
An interpolation between two ShapeBorder s.
ShapeDecoration
An immutable description of how to paint an arbitrary shape.
SharedAppData
Enables sharing key/value data with its child and all of the
child's descendants.
ShortcutActivator
An interface to define the keyboard key combination to trigger a shortcut.
ShortcutManager
A manager of keyboard shortcut bindings used by Shortcuts to handle key
events.
ShortcutMapProperty
A DiagnosticsProperty which handles formatting a Map<LogicalKeySet, Intent>
(the same type as the Shortcuts.shortcuts property) so that its
diagnostic output is human-readable.
ShortcutRegistrar
A widget that holds a ShortcutRegistry which allows descendants to add,
remove, or replace shortcuts.
ShortcutRegistry
A class used by ShortcutRegistrar that allows adding or removing shortcut
bindings by descendants of the ShortcutRegistrar .
ShortcutRegistryEntry
A entry returned by ShortcutRegistry.addAll that allows the caller to
identify the shortcuts they registered with the ShortcutRegistry through
the ShortcutRegistrar .
Shortcuts
A widget that creates key bindings to specific actions for its
descendants.
ShortcutSerialization
A class used by MenuSerializableShortcut to describe the shortcut for
serialization to send to the platform for rendering a PlatformMenuBar .
ShrinkWrappingViewport
A widget that is bigger on the inside and shrink wraps its children in the
main axis.
SimpleDialog
A simple Material Design dialog.
SimpleDialogOption
An option used in a SimpleDialog .
Simulation
The base class for all simulations.
SingleActivator
A shortcut key combination of a single key and modifiers.
SingleChildLayoutDelegate
A delegate for computing the layout of a render object with a single child.
SingleChildRenderObjectElement
An Element that uses a SingleChildRenderObjectWidget as its configuration.
SingleChildRenderObjectWidget
A superclass for RenderObjectWidget s that configure RenderObject subclasses
that have a single child slot.
SingleChildScrollView
A box in which a single widget can be scrolled.
SingletonFlutterWindow
Deprecated. Will be removed in a future version of Flutter.
Size
Holds a 2D floating-point size.
SizeChangedLayoutNotification
Indicates that the size of one of the descendants of the object receiving
this notification has changed, and that therefore any assumptions about that
layout are no longer valid.
SizeChangedLayoutNotifier
A widget that automatically dispatches a SizeChangedLayoutNotification
when the layout dimensions of its child change.
SizedBox
A box with a specified size.
SizedOverflowBox
A widget that is a specific size but passes its original constraints
through to its child, which may then overflow.
SizeTransition
Animates its own size and clips and aligns its child.
SizeTween
An interpolation between two sizes.
Slider
A Material Design slider.
SliderComponentShape
Base class for slider thumb, thumb overlay, and value indicator shapes.
SliderTheme
Applies a slider theme to descendant Slider widgets.
SliderThemeData
Holds the color, shape, and typography values for a Material Design slider
theme.
SliderTickMarkShape
Base class for Slider tick mark shapes.
SliderTrackShape
Base class for slider track shapes.
SlideTransition
Animates the position of a widget relative to its normal position.
SliverAnimatedGrid
A SliverGrid that animates items when they are inserted or removed.
SliverAnimatedGridState
The state for a SliverAnimatedGrid that animates items when they are
inserted or removed.
SliverAnimatedList
A SliverList that animates items when they are inserted or removed.
SliverAnimatedListState
The state for a SliverAnimatedList that animates items when they are
inserted or removed.
SliverAnimatedOpacity
Animated version of SliverOpacity which automatically transitions the
sliver child's opacity over a given duration whenever the given opacity
changes.
SliverAppBar
A Material Design app bar that integrates with a CustomScrollView .
SliverChildBuilderDelegate
A delegate that supplies children for slivers using a builder callback.
SliverChildDelegate
A delegate that supplies children for slivers.
SliverChildListDelegate
A delegate that supplies children for slivers using an explicit list.
SliverConstrainedCrossAxis
A sliver that constrains the cross axis extent of its sliver child.
SliverCrossAxisExpanded
Set a flex factor for allocating space in the cross axis direction.
SliverCrossAxisGroup
A sliver that places multiple sliver children in a linear array along
the cross axis.
SliverFadeTransition
Animates the opacity of a sliver widget.
SliverFillRemaining
A sliver that contains a single box child that fills the remaining space in
the viewport.
SliverFillViewport
A sliver that contains multiple box children that each fills the viewport.
SliverFixedExtentList
A sliver that places multiple box children with the same main axis extent in
a linear array.
A sliver that shows its child when the user scrolls forward and hides it
when the user scrolls backwards.
SliverGrid
A sliver that places multiple box children in a two dimensional arrangement.
SliverGridDelegate
Controls the layout of tiles in a grid.
SliverGridDelegateWithFixedCrossAxisCount
Creates grid layouts with a fixed number of tiles in the cross axis.
SliverGridDelegateWithMaxCrossAxisExtent
Creates grid layouts with tiles that each have a maximum cross-axis extent.
SliverIgnorePointer
A sliver widget that is invisible during hit testing.
SliverLayoutBuilder
Builds a sliver widget tree that can depend on its own SliverConstraints .
SliverList
A sliver that places multiple box children in a linear array along the main
axis.
SliverMainAxisGroup
A sliver that places multiple sliver children in a linear array along
the main axis, one after another.
SliverMultiBoxAdaptorElement
An element that lazily builds children for a SliverMultiBoxAdaptorWidget .
SliverMultiBoxAdaptorWidget
A base class for slivers that have multiple box children.
SliverOffstage
A sliver that lays its sliver child out as if it was in the tree, but
without painting anything, without making the sliver child available for hit
testing, and without taking any room in the parent.
SliverOpacity
A sliver widget that makes its sliver child partially transparent.
SliverOverlapAbsorber
A sliver that wraps another, forcing its layout extent to be treated as
overlap.
SliverOverlapAbsorberHandle
Handle to provide to a SliverOverlapAbsorber , a SliverOverlapInjector ,
and an NestedScrollViewViewport , to shift overlap in a NestedScrollView .
SliverOverlapInjector
A sliver that has a sliver geometry based on the values stored in a
SliverOverlapAbsorberHandle .
SliverPadding
A sliver that applies padding on each side of another sliver.
A sliver whose size varies when the sliver is scrolled to the edge
of the viewport opposite the sliver's GrowthDirection .
Delegate for configuring a SliverPersistentHeader .
SliverPrototypeExtentList
A sliver that places its box children in a linear array and constrains them
to have the same extent as a prototype item along the main axis.
SliverReorderableList
A sliver list that allows the user to interactively reorder the list items.
SliverReorderableListState
The state for a sliver list that allows the user to interactively reorder
the list items.
A sliver that is pinned to the start of its CustomScrollView and
reacts to scrolling by resizing between the intrinsic sizes of its
min and max extent prototypes.
SliverSafeArea
A sliver that insets another sliver by sufficient padding to avoid
intrusions by the operating system.
SliverToBoxAdapter
A sliver that contains a single box widget.
SliverVariedExtentList
A sliver that places its box children in a linear array and constrains them
to have the corresponding extent returned by itemExtentBuilder .
SliverVisibility
Whether to show or hide a sliver child.
SliverWithKeepAliveWidget
A base class for slivers that have KeepAlive children.
SlottedMultiChildRenderObjectWidget <SlotType , ChildType extends RenderObject >
A superclass for RenderObjectWidget s that configure RenderObject
subclasses that organize their children in different slots.
SlottedRenderObjectElement <SlotType , ChildType extends RenderObject >
Element used by the SlottedMultiChildRenderObjectWidget .
SmartButton
SmartCircularProgressIndicator
SmartImage
SmartText
SmartTheme
SmartWidgets
SnackBar
A lightweight message with an optional action which briefly displays at the
bottom of the screen.
SnackBarAction
A button for a SnackBar , known as an "action".
SnackBarThemeData
Customizes default property values for SnackBar widgets.
SnapshotController
A controller for the SnapshotWidget that controls when the child image is displayed
and when to regenerated the child image.
SnapshotPainter
A painter used to paint either a snapshot or the child widgets that
would be a snapshot.
SnapshotWidget
A widget that can replace its child with a snapshotted version of the child.
Socket
A TCP connection between two sockets.
SocketControlMessage
Control message part of the SocketMessage received by a call to
RawSocket.readMessage .
SocketDirection
The SocketDirection is used as a parameter to Socket.close and
RawSocket.close to close a socket in the specified direction(s).
SocketMessage
A socket message received by a RawDatagramSocket .
SocketOption
An option for a socket which is configured using Socket.setOption .
Spacer
Spacer creates an adjustable, empty spacer that can be used to tune the
spacing between widgets in a Flex container, like Row or Column .
SpellCheckConfiguration
Controls how spell check is performed for text input.
SpellCheckResults
A data structure grouping together the SuggestionSpan s and related text of
results returned by a spell checker.
SpellCheckService
Determines how spell check results are received for text input.
SpellCheckSuggestionsToolbar
The default spell check suggestions toolbar for Android.
SpellCheckSuggestionsToolbarLayoutDelegate
Positions the toolbar below anchor or adjusts it higher to fit above
the bottom view insets, if applicable.
Split
A curve that progresses according to beginCurve until split , then
according to endCurve .
SpringDescription
Structure that describes a spring's constants.
Stack
A widget that positions its children relative to the edges of its box.
StackFilter
A class that filters stack frames for additional filtering on
FlutterError.defaultStackFilter .
StackFrame
A object representation of a frame from a stack trace.
StadiumBorder
A border that fits a stadium-shaped border (a box with semicircles on the ends)
within the rectangle of the widget it is applied to.
StandardFabLocation
A base class that simplifies building FloatingActionButtonLocation s when
used with mixins FabTopOffsetY , FabFloatOffsetY , FabDockedOffsetY ,
FabStartOffsetX , FabCenterOffsetX , FabEndOffsetX , and FabMiniOffsetAdjustment .
StandardMessageCodec
MessageCodec using the Flutter standard binary encoding.
StandardMethodCodec
MethodCodec using the Flutter standard binary encoding.
StarBorder
A border that fits a star or polygon-shaped border within the rectangle of
the widget it is applied to.
State <T extends StatefulWidget >
The logic and internal state for a StatefulWidget .
StatefulBuilder
A platonic widget that both has state and calls a closure to obtain its child widget.
StatefulElement
An Element that uses a StatefulWidget as its configuration.
StatefulWidget
A widget that has mutable state.
StatelessElement
An Element that uses a StatelessWidget as its configuration.
StatelessWidget
A widget that does not require mutable state.
StatusTransitionWidget
A widget that rebuilds when the given animation changes status.
Stdin
The standard input stream of the process.
StdioType
The type of object a standard IO stream can be attached to.
Stdout
An IOSink connected to either the standard out or error of the process.
Step
A material step used in Stepper . The step can have a title and subtitle,
an icon within its circle, some content and a state that governs its
styling.
Stepper
A material stepper widget that displays progress through a sequence of
steps. Steppers are particularly useful in the case of forms where one step
requires the completion of another one, or where multiple steps need to be
completed in order to submit the whole form.
StepStyle
This class is used to override the default visual properties of Step widgets within a Stepper .
StepTween
An interpolation between two integers that floors.
Stream <T >
A source of asynchronous data events.
StreamBuilder <T >
Widget that builds itself based on the latest snapshot of interaction with
a Stream .
StreamBuilderBase <T , S >
Base class for widgets that build themselves based on interaction with
a specified Stream .
StreamConsumer <S >
Abstract interface for a "sink" accepting multiple entire streams.
StreamController <T >
A controller with the stream it controls.
StreamIterator <T >
An Iterator -like interface for the values of a Stream .
StreamSink <S >
A object that accepts stream events both synchronously and asynchronously.
StreamSubscription <T >
A subscription on events from a Stream .
StreamTransformer <S , T >
Transforms a Stream.
StreamTransformerBase <S , T >
Base class for implementing StreamTransformer .
StreamView <T >
Stream wrapper that only exposes the Stream interface.
StretchingOverscrollIndicator
A Material Design visual indication that a scroll view has overscrolled.
StringCodec
MessageCodec with UTF-8 encoded String messages.
StringConversionSink
A sink for converters to efficiently transmit String data.
StringProperty
Property which encloses its string value in quotes.
StrutStyle
Defines the strut, which sets the minimum height a line can be
relative to the baseline.
A menu button that displays a cascading menu.
SuggestionSpan
A data structure representing a range of misspelled text and the suggested
replacements for this range.
Summary
An annotation that provides a short description of a class for use
in an index.
SurfaceAndroidViewController
Controls an Android view that is composed using a GL texture.
This controller is created from the PlatformViewsService.initSurfaceAndroidView factory,
and is defined for backward compatibility.
Svg
A utility class for decoding SVG data to a DrawableRoot or a PictureInfo .
SvgAssetLoader
A BytesLoader that decodes and parses an SVG asset in an isolate and
creates a vector_graphics binary representation.
SvgBytesLoader
A BytesLoader that decodes and parses a UTF-8 encoded SVG string from a
Uint8List in an isolate and creates a vector_graphics binary
representation.
SvgCacheKey
A SvgTheme aware cache key.
SvgFileLoader
A BytesLoader that decodes SVG data from a file in an isolate and creates
a vector_graphics binary representation.
SvgLoader <T >
A BytesLoader that parses a SVG data in an isolate and creates a
vector_graphics binary representation.
SvgNetworkLoader
A BytesLoader that decodes and parses a UTF-8 encoded SVG string the
network in an isolate and creates a vector_graphics binary representation.
SvgPicture
A widget that will parse SVG data for rendering on screen.
SvgStringLoader
A BytesLoader that parses an SVG string in an isolate and creates a
vector_graphics binary representation.
SvgTheme
A theme used when decoding an SVG picture.
SweepGradient
A 2D sweep gradient.
Switch
A Material Design switch.
SwitchListTile
A ListTile with a Switch . In other words, a switch with a label.
SwitchTheme
Applies a switch theme to descendant Switch widgets.
SwitchThemeData
Defines default property values for descendant Switch widgets.
SynchronousFuture <T >
A Future whose then implementation calls the callback immediately.
SynchronousStreamController <T >
A stream controller that delivers its events synchronously.
SystemChannels
Platform channels used by the Flutter system.
SystemChrome
Controls specific aspects of the operating system's graphical interface and
how it interacts with the application.
Displays the system context menu on top of the Flutter view.
Allows access to the system context menu.
SystemEncoding
The system encoding is the current code page on Windows and UTF-8 on Linux
and Mac.
SystemMouseCursor
A mouse cursor that is natively supported on the platform that the
application is running on.
SystemMouseCursors
A collection of system MouseCursor s.
SystemNavigator
Controls specific aspects of the system navigation stack.
SystemSound
Provides access to the library of short system specific sounds for common
tasks.
SystemUiOverlayStyle
Specifies a preference for the style of the system overlays.
Tab
A Material Design TabBar tab.
TabBar
A Material Design primary tab bar.
TabBarTheme
Defines a theme for TabBar widgets.
TabBarThemeData
Defines default property values for descendant TabBar widgets.
TabBarView
A page view that displays the widget which corresponds to the currently
selected tab.
TabController
Coordinates tab selection between a TabBar and a TabBarView .
Table
A widget that uses the table layout algorithm for its children.
TableBorder
Border specification for Table widgets.
TableCell
A widget that controls how a child of a Table is aligned.
TableColumnWidth
Base class to describe how wide a column in a RenderTable should be.
TableRow
A horizontal group of cells in a Table .
TableRowInkWell
A rectangular area of a Material that responds to touch but clips
its ink splashes to the current table row of the nearest table.
TabPageSelector
Uses TabPageSelectorIndicator to display a row of small circular
indicators, one per tab.
TabPageSelectorIndicator
Displays a single circle with the specified size, border style, border color
and background colors.
TapDownDetails
Details for GestureTapDownCallback , such as position.
TappableChipAttributes
An interface for Material Design chips that can be tapped.
TapRegion
A widget that defines a region that can detect taps inside or outside of
itself and any group of regions it belongs to, without participating in the
gesture
disambiguation system
(other than to consume tap down events if consumeOutsideTaps is true).
TapRegionRegistry
An interface for registering and unregistering a RenderTapRegion
(typically created with a TapRegion widget) with a
RenderTapRegionSurface (typically created with a TapRegionSurface
widget).
TapRegionSurface
A widget that provides notification of a tap inside or outside of a set of
registered regions, without participating in the gesture
disambiguation
system.
TapUpDetails
Details for GestureTapUpCallback , such as position.
Text
A run of text with a single style.
TextAlignVertical
The vertical alignment of text within an input box.
TextBoundary
An interface for retrieving the logical text boundary (as opposed to the
visual boundary) at a given code unit offset in a document.
TextBox
A rectangle enclosing a run of text.
TextButton
A Material Design "Text Button".
TextButtonTheme
Overrides the default ButtonStyle of its TextButton descendants.
TextButtonThemeData
A ButtonStyle that overrides the default appearance of
TextButton s when it's used with TextButtonTheme or with the
overall Theme 's ThemeData.textButtonTheme .
TextDecoration
A linear decoration to draw near the text.
TextEditingController
A controller for an editable text field.
TextEditingDelta
A structure representing a granular change that has occurred to the editing
state as a result of text editing.
TextEditingDeltaDeletion
A structure representing the deletion of a single/or contiguous sequence of
characters in an editing state.
TextEditingDeltaInsertion
A structure representing an insertion of a single/or contiguous sequence of
characters at some offset of an editing state.
TextEditingDeltaNonTextUpdate
A structure representing changes to the selection and/or composing regions
of an editing state and no changes to the text value.
TextEditingDeltaReplacement
A structure representing a replacement of a range of characters with a
new sequence of text.
TextEditingValue
The current text, selection, and composing state for editing a run of text.
TextField
A Material Design text field.
TextFieldTapRegion
A TapRegion that adds its children to the tap region group for widgets
based on the EditableText text editing widget, such as TextField and
CupertinoTextField .
TextFormField
A FormField that contains a TextField .
TextHeightBehavior
Defines how to apply TextStyle.height over and under text.
TextInput
An low-level interface to the system's text input control.
TextInputConfiguration
Controls the visual appearance of the text input control.
TextInputConnection
An interface for interacting with a text input control.
TextInputFormatter
A TextInputFormatter can be optionally injected into an EditableText
to provide as-you-type validation and formatting of the text being edited.
TextInputType
The type of information for which to optimize the text input control.
TextLayoutMetrics
A read-only interface for accessing visual information about the
implementing text.
TextMagnifier
A Magnifier positioned by rules dictated by the native Android magnifier.
TextMagnifierConfiguration
A configuration object for a magnifier (e.g. in a text field).
TextPainter
An object that paints a TextSpan tree into a Canvas .
TextPosition
A position in a string of text.
A range of characters in a string of text.
TextScaler
A class that describes how textual contents should be scaled for better
readability.
TextSelection
A range of text that represents a selection.
TextSelectionControls
An interface for building the selection UI, to be provided by the
implementer of the toolbar widget.
TextSelectionGestureDetector
A gesture detector to respond to non-exclusive event chains for a text field.
TextSelectionGestureDetectorBuilder
Builds a TextSelectionGestureDetector to wrap an EditableText .
TextSelectionGestureDetectorBuilderDelegate
Delegate interface for the TextSelectionGestureDetectorBuilder .
TextSelectionOverlay
An object that manages a pair of text selection handles for a
RenderEditable .
TextSelectionPoint
Represents the coordinates of the point in a selection, and the text
direction at that point, relative to top left of the RenderEditable that
holds the selection.
TextSelectionTheme
An inherited widget that defines the appearance of text selection in
this widget's subtree.
TextSelectionThemeData
Defines the visual properties needed for text selection in TextField and
SelectableText widgets.
TextSelectionToolbar
A fully-functional Material-style text selection toolbar.
TextSelectionToolbarAnchors
The position information for a text selection toolbar.
TextSelectionToolbarLayoutDelegate
A SingleChildLayoutDelegate for use with CustomSingleChildLayout that
positions its child above anchorAbove if it fits, or otherwise below
anchorBelow .
TextSelectionToolbarTextButton
A button styled like a Material native Android text selection menu button.
TextSpan
An immutable span of text.
TextStyle
An immutable style describing how to format and paint text.
TextStyleTween
An interpolation between two TextStyle s.
TextTheme
Material design text theme.
TextTreeConfiguration
Configuration specifying how a particular DiagnosticsTreeStyle should be
rendered as text art.
TextTreeRenderer
Renderer that creates ASCII art representations of trees of
DiagnosticsNode objects.
Texture
A rectangle upon which a backend texture is mapped.
TextureAndroidViewController
Controls an Android view that is rendered as a texture.
This is typically used by AndroidView to display a View in the Android view hierarchy.
Theme
Applies a theme to descendant widgets.
ThemeData
Defines the configuration of the overall visual Theme for a MaterialApp
or a widget subtree within the app.
ThemeDataTween
An interpolation between two ThemeData s.
ThemeExtension <T extends ThemeExtension <T > >
An interface that defines custom additions to a ThemeData object.
ThreePointCubic
A cubic polynomial composed of two curves that share a common center point.
Threshold
A curve that is 0.0 until it hits the threshold, then it jumps to 1.0.
TickerFuture
An object representing an ongoing Ticker sequence.
TickerMode
Enables or disables tickers (and thus animation controllers) in the widget
subtree.
TickerProvider
An interface implemented by classes that can vend Ticker objects.
TimedBlock
Provides start , end , and duration of a named block of code, timed by
FlutterTimeline .
TimeOfDay
A value representing a time during the day, independent of the date that
day might fall on or the time zone.
TimePickerDialog
A Material Design time picker designed to appear inside a popup dialog.
TimePickerTheme
An inherited widget that defines the configuration for time pickers
displayed using showTimePicker in this widget's subtree.
TimePickerThemeData
Defines the visual properties of the widget displayed with showTimePicker .
Timer
A countdown timer that can be configured to fire once or repeatedly.
Title
A widget that describes this app in the operating system.
TlsProtocolVersion
A Transport Layer Security (TLS) version.
ToggleablePainter
A base class for a CustomPainter that may be passed to
ToggleableStateMixin.buildToggleable to draw the visual representation of
a Toggleable.
ToggleButtons
A set of toggle buttons.
ToggleButtonsTheme
An inherited widget that defines color and border parameters for
ToggleButtons in this widget's subtree.
ToggleButtonsThemeData
Defines the color and border properties of ToggleButtons widgets.
Tolerance
Structure that specifies maximum allowable magnitudes for distances,
durations, and velocity differences to be considered equal.
ToolbarItemsParentData
ParentData that determines whether or not to paint the corresponding child.
ToolbarOptions
Toolbar configuration for EditableText .
Tooltip
A Material Design tooltip.
TooltipState
Contains the state for a Tooltip .
TooltipTheme
Applies a tooltip theme to descendant Tooltip widgets.
TooltipThemeData
Defines the visual properties of Tooltip widgets, a tooltip theme.
TooltipVisibility
Overrides the visibility of descendant Tooltip widgets.
TrackingScrollController
A ScrollController whose initialScrollOffset tracks its most recently
updated ScrollPosition .
TrainHoppingAnimation
This animation starts by proxying one animation, but when the value of that
animation crosses the value of the second (either because the second is
going in the opposite direction, or because the one overtakes the other),
the animation hops over to proxying the second animation.
Transform
A widget that applies a transformation before painting its child.
TransformationController
A thin wrapper on ValueNotifier whose value is a Matrix4 representing a
transformation.
TransformProperty
Property which handles Matrix4 that represent transforms.
TransitionDelegate <T >
The delegate that decides how pages added and removed from Navigator.pages
transition in or out of the screen.
TransitionRoute <T >
A route with entrance and exit transitions.
TransposeCharactersIntent
An Intent that represents a user interaction that attempts to swap the
characters immediately around the cursor.
TreeSliver <T >
A widget that displays TreeSliverNode s that expand and collapse in a
vertically and horizontally scrolling Viewport .
TreeSliverController
Enables control over the TreeSliverNode s of a TreeSliver .
TreeSliverNode <T >
A data structure for configuring children of a TreeSliver .
Tween <T extends Object ? >
A linear interpolation between a beginning and ending value.
TweenAnimationBuilder <T extends Object ? >
Widget builder that animates a property of a Widget to a target value
whenever the target value changes.
TweenSequence <T >
Enables creating an Animation whose value is defined by a sequence of
Tween s.
TweenSequenceItem <T >
A simple holder for one element of a TweenSequence .
TwoDimensionalChildBuilderDelegate
A delegate that supplies children for a TwoDimensionalScrollView using a
builder callback.
TwoDimensionalChildDelegate
A delegate that supplies children for scrolling in two dimensions.
TwoDimensionalChildListDelegate
A delegate that supplies children for a TwoDimensionalViewport using an
explicit two dimensional array.
TwoDimensionalChildManager
A delegate used by RenderTwoDimensionalViewport to manage its children.
TwoDimensionalScrollable
A widget that manages scrolling in both the vertical and horizontal
dimensions and informs the TwoDimensionalViewport through which the
content is viewed.
TwoDimensionalScrollableState
State object for a TwoDimensionalScrollable widget.
TwoDimensionalScrollView
A widget that combines a TwoDimensionalScrollable and a
TwoDimensionalViewport to create an interactive scrolling pane of content
in both vertical and horizontal dimensions.
TwoDimensionalViewport
A widget through which a portion of larger content can be viewed, typically
in combination with a TwoDimensionalScrollable .
TwoDimensionalViewportParentData
Parent data structure used by RenderTwoDimensionalViewport .
Typography
The color and geometry TextTheme s for Material apps.
UiKitView
Embeds an iOS view in the Widget hierarchy.
UiKitViewController
Controller for an iOS platform view.
Uint8List
A fixed-length list of 8-bit unsigned integers.
UnconstrainedBox
A widget that imposes no constraints on its child, allowing it to render
at its "natural" size.
UnderlineInputBorder
Draws a horizontal line at the bottom of an InputDecorator 's container and
defines the container's shape.
UnderlineTabIndicator
Used with TabBar.indicator to draw a horizontal line below the
selected tab.
UndoHistory <T >
Provides undo/redo capabilities for a ValueNotifier .
UndoHistoryController
A controller for the undo history, for example for an editable text field.
UndoHistoryState <T >
State for a UndoHistory .
UndoHistoryValue
Represents whether the current undo stack can undo or redo.
UndoManager
A low-level interface to the system's undo manager.
UndoTextIntent
An Intent that represents a user interaction that attempts to go back to
the previous editing state.
Unicode
Constants for useful Unicode characters.
UniqueKey
A key that is only equal to itself.
UniqueWidget <T extends State <StatefulWidget >
Base class for stateful widgets that have exactly one inflated instance in
the tree.
UnmanagedRestorationScope
Inserts a provided RestorationBucket into the widget tree and makes it
available to descendants via RestorationScope.of .
UpdateSelectionIntent
An Intent that represents a user interaction that attempts to change the
selection in an input field.
A Material Design Drawer header that identifies the app's user.
UserScrollNotification
A notification that the user has changed the ScrollDirection in which they
are scrolling, or have stopped scrolling.
Utf8Codec
A Utf8Codec encodes strings to utf-8 code units (bytes) and decodes
UTF-8 code units to strings.
Utf8Decoder
This class converts UTF-8 code units (lists of unsigned 8-bit integers)
to a string.
Utf8Encoder
This class converts strings to their UTF-8 code units (a list of
unsigned 8-bit integers).
ValueKey <T >
A key that uses a value of a particular type to identify itself.
ValueListenable <T >
An interface for subclasses of Listenable that expose a value .
ValueListenableBuilder <T >
A widget whose content stays synced with a ValueListenable .
ValueNotifier <T >
A ChangeNotifier that holds a single value.
VectorGraphicUtilities
Utility functionality for interaction with vector graphic assets.
Velocity
A velocity in two dimensions.
VerticalDivider
A thin vertical line, with padding on either side.
View
Bootstraps a render tree that is rendered into the provided FlutterView .
ViewAnchor
Decorates a child widget with a side View .
ViewCollection
A collection of sibling View s.
Viewport
A widget through which a portion of larger content can be viewed, typically
in combination with a Scrollable .
Visibility
Whether to show or hide a child.
VisualDensity
Defines the visual density of user interface components.
VoidCallbackAction
An Action that invokes the VoidCallback given to it in the
VoidCallbackIntent passed to it when invoked.
VoidCallbackIntent
An Intent that keeps a VoidCallback to be invoked by a
VoidCallbackAction when it receives this intent.
WeakMap <K , V >
Does not hold keys from garbage collection.
WebSocket
A two-way HTTP communication object for client or server applications.
WebSocketStatus
WebSocket status codes used when closing a WebSocket connection.
WebSocketTransformer
The WebSocketTransformer provides the ability to upgrade a
HttpRequest to a WebSocket connection. It supports both
upgrading a single HttpRequest and upgrading a stream of
HttpRequest s.
Widget
Describes the configuration for an Element .
WidgetInspector
A widget that enables inspecting the child widget's structure.
WidgetOrderTraversalPolicy
A FocusTraversalPolicy that traverses the focus order in widget hierarchy
order.
WidgetsApp
A convenience widget that wraps a number of widgets that are commonly
required for an application.
WidgetsBindingObserver
Interface for classes that register with the Widgets layer binding.
WidgetsFlutterBinding
A concrete binding for applications based on the Widgets framework.
WidgetsLocalizations
Interface for localized resource values for the lowest levels of the Flutter
framework.
WidgetSpan
An immutable widget that is embedded inline within text.
WidgetStateBorderSide
Defines a BorderSide whose value depends on a set of WidgetState s
which represent the interactive state of a component.
WidgetStateColor
Defines a Color that is also a WidgetStateProperty .
WidgetStateMouseCursor
Defines a MouseCursor whose value depends on a set of WidgetState s which
represent the interactive state of a component.
WidgetStateOutlinedBorder
Defines an OutlinedBorder whose value depends on a set of WidgetState s
which represent the interactive state of a component.
WidgetStateProperty <T >
Interface for classes that resolve to a value of type T based
on a widget's interactive "state", which is defined as a set
of WidgetState s.
WidgetStatePropertyAll <T >
Convenience class for creating a WidgetStateProperty that
resolves to the given value for all states.
WidgetStatesConstraint
This class allows WidgetState enum values to be combined
using WidgetStateOperators .
WidgetStatesController
Manages a set of WidgetState s and notifies listeners of changes.
WidgetStateTextStyle
Defines a TextStyle that is also a WidgetStateProperty .
WidgetToRenderBoxAdapter
An adapter for placing a specific RenderBox in the widget tree.
WillPopScope
Registers a callback to veto attempts by the user to dismiss the enclosing
ModalRoute .
WordBoundary
A TextBoundary subclass for locating word breaks.
Wrap
A widget that displays its children in multiple horizontal or vertical runs.
WriteBuffer
Write-only buffer for incrementally building a ByteData instance.
WritePipe
The "write" end of an Pipe created by Pipe.create .
X509Certificate
X509Certificate represents an SSL certificate, with accessors to
get the fields of the certificate.
YearPicker
A scrollable grid of years to allow picking a year.
ZLibCodec
The ZLibCodec encodes raw bytes to ZLib compressed bytes and decodes ZLib
compressed bytes to raw bytes.
ZLibDecoder
The ZLibDecoder is used by ZLibCodec and GZipCodec to decompress data.
ZLibEncoder
The ZLibEncoder encoder is used by ZLibCodec and GZipCodec to compress
data.
ZLibOption
Exposes ZLib options for input parameters.
Zone
A zone represents an environment that remains stable across asynchronous
calls.
ZoneDelegate
An adapted view of the parent zone.
ZoneSpecification
A parameter object with custom zone function handlers for Zone.fork .
ZoomPageTransitionsBuilder
Used by PageTransitionsTheme to define a zooming MaterialPageRoute page
transition animation that looks like the default page transition used on
Android Q.
Enums
AndroidOverscrollIndicator
Types of overscroll indicators supported by TargetPlatform.android .
AnimationBehavior
Configures how an AnimationController behaves when animations are
disabled.
AnimationStatus
The status of an animation.
AppLifecycleState
States that an application can be in once it is running.
AutofillContextAction
Predefined autofill context clean up actions.
AutovalidateMode
Used to configure the auto validation of FormField and Form widgets.
Axis
The two cardinal directions in two dimensions.
AxisDirection
A direction along either the horizontal or vertical Axis in which the
origin, or zero position, is determined.
BannerLocation
Where to show a Banner .
BlendMode
Algorithms to use when painting on the canvas.
BlurStyle
Styles to use for blurs in MaskFilter objects.
BorderStyle
The style of line to draw for a BorderSide in a Border .
BottomNavigationBarLandscapeLayout
Refines the layout of a BottomNavigationBar when the enclosing
MediaQueryData.orientation is Orientation.landscape .
BottomNavigationBarType
Defines the layout and behavior of a BottomNavigationBar .
BoxFit
How a box should be inscribed into another box.
BoxShape
The shape to use when rendering a Border or BoxDecoration .
Brightness
Describes the contrast of a theme or color palette.
ButtonBarLayoutBehavior
Used with ButtonTheme and ButtonThemeData to define how the button bar
should size itself with either constraints or internal padding.
ButtonTextTheme
Used with ButtonTheme and ButtonThemeData to define a button's base
colors, and the defaults for the button's minimum size, internal padding,
and shape.
CacheManagerLogLevel
Log levels of the cache manager. Debug shows failed downloads and verbose
also shows successful downloads and cache retrievals.
Clip
Different ways to clip a widget's content.
ClipboardStatus
An enumeration of the status of the content on the user's clipboard.
CollapseMode
The collapsing effect while the space bar collapses from its full size.
ConnectionState
The state of connection to an asynchronous computation.
The buttons that can appear in a context menu by default.
CrossAxisAlignment
How the children should be placed along the cross axis in a flex layout.
CrossFadeState
Specifies which of two children to show. See AnimatedCrossFade .
DatePickerEntryMode
Mode of date entry method for the date picker dialog.
DatePickerMode
Initial display of a calendar date picker.
DayPeriod
Whether the TimeOfDay is before or after noon.
DecorationPosition
Where to paint a box decoration.
DeviceOrientation
Specifies a particular device orientation.
DeviceType
DiagnosticLevel
The various priority levels used to filter which diagnostics are shown and
omitted.
DiagnosticsTreeStyle
Styles for displaying a node in a DiagnosticsNode tree.
DiagonalDragBehavior
Specifies how to configure the DragGestureRecognizer s of a
TwoDimensionalScrollable .
DismissDirection
The direction in which a Dismissible can be dismissed.
DrawerAlignment
The possible alignments of a Drawer .
DynamicSchemeVariant
The algorithm used to construct a ColorScheme in ColorScheme.fromSeed .
FilterQuality
Quality levels for image sampling in ImageFilter and Shader objects that sample
images and for Canvas operations that render images.
FlexFit
How the child is inscribed into the available space.
FloatingCursorDragState
The state of a "floating cursor" drag on an iOS soft keyboard.
Specifies how a partially visible SliverFloatingHeader animates
into a view when a user scroll gesture ends.
FloatingLabelBehavior
Defines how the floating label should behave.
FlutterLogoStyle
Possible ways to draw Flutter's logo.
FocusHighlightMode
An enum to describe which kind of focus highlight behavior to use when
displaying focus information.
FocusHighlightStrategy
An enum to describe how the current value of FocusManager.highlightMode is
determined. The strategy is set on FocusManager.highlightStrategy .
FontStyle
Whether to use the italic type variation of glyphs in the font.
FoundationServiceExtensions
Service extension constants for the foundation library.
GrowthDirection
The direction in which a sliver's contents are ordered, relative to the
scroll offset axis.
HeroFlightDirection
Direction of the hero's flight based on the navigation operation.
HitTestBehavior
How to behave during hit tests.
HourFormat
Describes how hours are formatted.
HttpClientResponseCompressionState
Enum that specifies the compression state of the byte stream of an
HttpClientResponse .
IconAlignment
Determines the alignment of the icon within the widgets such as:
ImageRepeat
How to paint any portions of a box not covered by an image.
ImageType
KeyboardLockMode
Represents a lock mode of a keyboard, such as KeyboardLockMode.capsLock .
KeyboardSide
An enum describing the side of the keyboard that a key is on, to allow
discrimination between which key is pressed (e.g. the left or right SHIFT
key).
KeyDataTransitMode
The mode in which information of key messages is delivered.
KeyEventResult
An enum that describes how to handle a key event handled by a
FocusOnKeyCallback or FocusOnKeyEventCallback .
ListTileControlAffinity
Where to place the control in widgets that use ListTile to position a
control next to a label.
ListTileStyle
Defines the title font used for ListTile descendants of a ListTileTheme .
ListTileTitleAlignment
Defines how ListTile.leading and ListTile.trailing are
vertically aligned relative to the ListTile 's titles
(ListTile.title and ListTile.subtitle ).
LiveTextInputStatus
An enumeration that indicates whether the current device is available for Live Text input.
LockState
Determines how the state of a lock key is used to accept a shortcut.
MainAxisAlignment
How the children should be placed along the main axis in a flex layout.
MainAxisSize
How much space should be occupied in the main axis.
MaterialBannerClosedReason
Specify how a MaterialBanner was closed.
MaterialTapTargetSize
Configures the tap target and layout size of certain Material widgets.
MaterialType
The various kinds of material in Material Design. Used to
configure the default behavior of Material widgets.
MaxLengthEnforcement
Mechanisms for enforcing maximum length limits.
ModifierKey
An enum describing the type of modifier key that is being pressed.
NavigationDestinationLabelBehavior
Specifies when each NavigationDestination 's label should appear.
NavigationMode
Describes the navigation mode to be set by a MediaQuery widget.
NavigationRailLabelType
Defines the behavior of the labels of a NavigationRail .
OptionsViewOpenDirection
A direction in which to open the options-view overlay.
Orientation
Whether in portrait or landscape.
OverflowBarAlignment
Defines the horizontal alignment of OverflowBar children
when they're laid out in an overflow column.
PaintingStyle
Strategies for painting shapes and paths on a canvas.
PanAxis
This enum is used to specify the behavior of the InteractiveViewer when
the user drags the viewport.
PathFillType
Determines the winding rule that decides how the interior of a Path is
calculated.
PathOperation
Strategies for combining paths.
PlaceholderAlignment
Where to vertically align the placeholder relative to the surrounding text.
The list of possible platform provided, prebuilt menus for use in a
PlatformMenuBar .
Used to configure how the PopupMenuButton positions its popup menu.
RefreshIndicatorStatus
Indicates current status of Material RefreshIndicator.
RefreshIndicatorTriggerMode
Used to configure how RefreshIndicator can be triggered.
RenderComparison
The description of the difference between two objects, in the context of how
it will affect the rendering.
ResizeImagePolicy
Configures the behavior for ResizeImage .
RouteInformationReportingType
The Router 's intention when it reports a new RouteInformation to the
RouteInformationProvider .
RoutePopDisposition
Indicates whether the current route should be popped.
ScriptCategory
A characterization of the of a TextTheme 's glyphs that is used to define
its localized TextStyle geometry for ThemeData.textTheme .
ScrollbarOrientation
An orientation along either the horizontal or vertical Axis .
ScrollDecelerationRate
The rate at which scroll momentum will be decelerated.
ScrollIncrementType
Describes the type of scroll increment that will be performed by a
ScrollAction on a Scrollable .
ScrollPositionAlignmentPolicy
The policy to use when applying the alignment parameter of
ScrollPosition.ensureVisible .
ScrollViewKeyboardDismissBehavior
A representation of how a ScrollView should dismiss the on-screen
keyboard.
SelectionChangedCause
Indicates what triggered the change in selected text (including changes to
the cursor location).
ServicesServiceExtensions
Service extension constants for the services library.
ShowValueIndicator
Describes the conditions under which the value indicator on a Slider
will be shown. Used with SliderThemeData.showValueIndicator .
SliderInteraction
Possible ways for a user to interact with a Slider .
SmartDashesType
Indicates how to handle the intelligent replacement of dashes in text input.
SmartQuotesType
Indicates how to handle the intelligent replacement of quotes in text input.
SnackBarBehavior
Defines where a SnackBar should appear within a Scaffold and how its
location should be adjusted when the scaffold also includes a
FloatingActionButton or a BottomNavigationBar .
SnackBarClosedReason
Specify how a SnackBar was closed.
SnapshotMode
Controls how the SnapshotWidget paints its child.
StackFit
How to size the non-positioned children of a Stack .
StandardComponentType
An enum identifying standard UI components.
StepperType
Defines the Stepper 's main axis.
StepState
The state of a Step which is used to control the style of the circle and
text.
StretchMode
The stretching effect while the space bar stretches beyond its full size.
StrokeCap
Styles to use for line endings.
StrokeJoin
Styles to use for line segment joins.
SwipeEdge
Enum representing the edge from which a swipe starts in a back gesture.
SystemSoundType
A sound provided by the system.
SystemUiMode
Describes different display configurations for both Android and iOS.
SystemUiOverlay
Specifies a system overlay at a particular location.
TabAlignment
Defines how tabs are aligned horizontally in a TabBar .
TabBarIndicatorSize
Defines how the bounds of the selected tab indicator are computed.
TabIndicatorAnimation
Defines how the tab indicator animates when the selected tab changes.
TableCellVerticalAlignment
Vertical alignment options for cells in RenderTable objects.
TargetPlatform
The platform that user interaction should adapt to target.
TextAffinity
A way to disambiguate a TextPosition when its offset could match two
different locations in the rendered string.
TextAlign
Whether and how to align text horizontally.
TextBaseline
A horizontal line used for aligning text.
TextCapitalization
Configures how the platform keyboard will select an uppercase or
lowercase keyboard.
TextDecorationStyle
The style in which to draw a text decoration
TextDirection
A direction in which text flows.
TextInputAction
An action the user has requested the text input control to perform.
TextLeadingDistribution
How the "leading" is distributed
over and under the text.
TextOverflow
How overflowing text should be handled.
TextSelectionHandleType
The type of selection handle to be displayed.
TextWidthBasis
The different ways of measuring the width of one or more lines of text.
ThemeMode
Describes which theme will be used by MaterialApp .
Thumb
Identifier for a thumb.
TileMode
Defines what happens at the edge of a gradient or the sampling of a source image
in an ImageFilter .
TimeOfDayFormat
Determines how the time picker invoked using showTimePicker formats and
lays out the time controls.
TimePickerEntryMode
Interactive input mode of the time picker dialog.
TooltipTriggerMode
The method of interaction that will trigger a tooltip.
Used in Tooltip.triggerMode and TooltipThemeData.triggerMode .
TraversalDirection
A direction along either the horizontal or vertical axes.
TraversalEdgeBehavior
Controls the transfer of focus beyond the first and the last items of a
FocusScopeNode .
UndoDirection
The direction in which an undo action should be performed, whether undo or redo.
UnfocusDisposition
Describe what should happen after FocusNode.unfocus is called.
VertexMode
Defines how a list of points is interpreted when drawing a set of triangles.
VerticalDirection
A direction in which boxes flow vertically.
WidgetInspectorServiceExtensions
Service extension constants for the Widget Inspector.
WidgetsServiceExtensions
Service extension constants for the widgets library.
WidgetState
Interactive states that some of the widgets can take on when receiving input
from the user.
WrapAlignment
How Wrap should align objects.
WrapCrossAlignment
Who Wrap should align children within a run in the cross axis.
Mixins
AnimationEagerListenerMixin
A mixin that replaces the didRegisterListener /didUnregisterListener contract
with a dispose contract.
AnimationLazyListenerMixin
A mixin that helps listen to another object only when this object has registered listeners.
AnimationLocalListenersMixin
A mixin that implements the addListener /removeListener protocol and notifies
all the registered listeners when notifyListeners is called.
AnimationLocalStatusListenersMixin
A mixin that implements the addStatusListener/removeStatusListener protocol
and notifies all the registered listeners when notifyStatusListeners is
called.
AnimationWithParentMixin <T >
Implements most of the Animation interface by deferring its behavior to a
given parent Animation.
AutofillScopeMixin
A partial implementation of AutofillScope .
AutomaticKeepAliveClientMixin <T extends StatefulWidget >
A mixin with convenience methods for clients of AutomaticKeepAlive . Used
with State subclasses.
BaseRangeSliderTrackShape
Base range slider track shape that provides an implementation of getPreferredRect for
default sizing.
BaseSliderTrackShape
Base track shape that provides an implementation of getPreferredRect for
default sizing.
DeltaTextInputClient
An interface to receive granular information from TextInput .
Diagnosticable
A mixin class for providing string and DiagnosticsNode debug
representations describing the properties of an object.
DiagnosticableTreeMixin
A mixin that helps dump string and DiagnosticsNode representations of trees.
DirectionalFocusTraversalPolicyMixin
A mixin class that provides an implementation for finding a node in a
particular direction.
FabCenterOffsetX
Mixin for a "center" floating action button location, such as FloatingActionButtonLocation.centerFloat .
FabContainedOffsetY
Mixin for a "contained" floating action button location, such as FloatingActionButtonLocation.endContained .
FabDockedOffsetY
Mixin for a "docked" floating action button location, such as FloatingActionButtonLocation.endDocked .
FabEndOffsetX
Mixin for an "end" floating action button location, such as FloatingActionButtonLocation.endDocked .
FabFloatOffsetY
Mixin for a "float" floating action button location, such as FloatingActionButtonLocation.centerFloat .
FabMiniOffsetAdjustment
Mixin for a "mini" floating action button location, such as FloatingActionButtonLocation.miniStartTop .
FabStartOffsetX
Mixin for a "start" floating action button location, such as FloatingActionButtonLocation.startTop .
FabTopOffsetY
Mixin for a "top" floating action button location, such as
FloatingActionButtonLocation.startTop .
LocalHistoryRoute <T >
A mixin used by routes to handle back navigations internally by popping a list.
MaterialRouteTransitionMixin <T >
A mixin that provides platform-adaptive transitions for a PageRoute .
MaterialStateMixin <T extends StatefulWidget >
Mixin for State classes that require knowledge of changing MaterialState
values for their child widgets.
A mixin allowing a ShortcutActivator to provide data for serialization of
the shortcut when sending to the platform.
NotifiableElementMixin
Mixin this class to allow receiving Notification objects dispatched by
child elements.
PaintingBinding
Binding for the painting library.
PopNavigatorRouterDelegateMixin <T >
A mixin that wires RouterDelegate.popRoute to the Navigator it builds.
RenderConstrainedLayoutBuilder <ConstraintType extends Constraints , ChildType extends RenderObject >
Generic mixin for RenderObject s created by ConstrainedLayoutBuilder .
RestorationMixin <S extends StatefulWidget >
Manages the restoration data for a State object of a StatefulWidget .
RootElementMixin
Mixin for the element at the root of the tree.
ScrollMetrics
A description of a Scrollable 's contents, useful for modeling the state
of its viewport.
ServicesBinding
Listens for platform messages and directs them to the defaultBinaryMessenger .
SingleTickerProviderStateMixin <T extends StatefulWidget >
Provides a single Ticker that is configured to only tick while the current
tree is enabled, as defined by TickerMode .
SlottedContainerRenderObjectMixin <SlotType , ChildType extends RenderObject >
Mixin for a RenderObject configured by a SlottedMultiChildRenderObjectWidget .
SlottedMultiChildRenderObjectWidgetMixin <SlotType , ChildType extends RenderObject >
A mixin version of SlottedMultiChildRenderObjectWidget .
SU
An interface to receive calls related to the system context menu from the
engine.
TextInputClient
An interface to receive information from TextInput .
TextInputControl
An interface for implementing text input controls that receive text editing
state changes and visual input control requests.
TextSelectionDelegate
A mixin for manipulating the selection, provided for toolbar or shortcut
keys.
TextSelectionHandleControls
TextSelectionControls that specifically do not manage the toolbar in order
to leave that to EditableText.contextMenuBuilder .
TickerProviderStateMixin <T extends StatefulWidget >
Provides Ticker objects that are configured to only tick while the current
tree is enabled, as defined by TickerMode .
ToggleableStateMixin <S extends StatefulWidget >
A mixin for StatefulWidget s that implement toggleable
controls with toggle animations (e.g. Switch es, CupertinoSwitch es,
Checkbox es, CupertinoCheckbox es, Radio s, and CupertinoRadio s).
TreeSliverStateMixin <T >
A mixin for classes implementing a tree structure as expected by a
TreeSliverController .
UndoManagerClient
An interface to receive events from a native UndoManager.
ViewportElementMixin
A mixin that allows Element s containing Viewport like widgets to correctly
modify the notification depth of a ViewportNotificationMixin .
ViewportNotificationMixin
Mixin for Notification s that track how many RenderAbstractViewport they
have bubbled through.
WidgetInspectorService
Service used by GUI tools to interact with the WidgetInspector .
WidgetsBinding
The glue between the widgets layer and the Flutter engine.
Extensions
BorderRadiusExtension BorderRadius
BoxConstraintsExtension BoxConstraints
EdgeInsetsExtension EdgeInsets
FutureExtensions Future <T >
Convenience methods on futures.
FutureIterable Iterable <Future <T >
FutureRecord2 Future <T1 > Future <T2 >
Parallel operations on a record of futures.
FutureRecord3 Future <T1 > Future <T2 > Future <T3 >
Parallel operations on a record of futures.
FutureRecord4 Future <T1 > Future <T2 > Future <T3 > Future <T4 >
Parallel operations on a record of futures.
FutureRecord5 Future <T1 > Future <T2 > Future <T3 > Future <T4 > Future <T5 >
Parallel operations on a record of futures.
FutureRecord6 Future <T1 > Future <T2 > Future <T3 > Future <T4 > Future <T5 > Future <T6 >
Parallel operations on a record of futures.
FutureRecord7 Future <T1 > Future <T2 > Future <T3 > Future <T4 > Future <T5 > Future <T6 > Future <T7 >
Parallel operations on a record of futures.
FutureRecord8 Future <T1 > Future <T2 > Future <T3 > Future <T4 > Future <T5 > Future <T6 > Future <T7 > Future <T8 >
Parallel operations on a record of futures.
FutureRecord9 Future <T1 > Future <T2 > Future <T3 > Future <T4 > Future <T5 > Future <T6 > Future <T7 > Future <T8 > Future <T9 >
Parallel operations on a record of futures.
NullableStringExtensions String ?
RadiusExtension Radius
SizeExtension num
StringCharacters String
StringExtensions String
WidgetStateOperators WidgetStatesConstraint
These operators can be used inside a WidgetStateMap to combine states
and find a match.
Constants
accelerateEasing → const Curve
The accelerate easing curve in the Material 2 specification.
appFlavor → const String ?
The flavor this app was built with.
ascii → const AsciiCodec
An instance of the default implementation of the AsciiCodec .
base64 → const Base64Codec
A base64 encoder and decoder.
base64Url → const Base64Codec
A base64url encoder and decoder.
decelerateEasing → const Curve
The decelerate easing curve in the Material 2 specification.
factory → const _Factory
Used to annotate an instance or static method m. Indicates that m must
either be abstract or must return a newly allocated object or null. In
addition, every method that either implements or overrides m is implicitly
annotated with this same annotation.
gzip → const GZipCodec
An instance of the default implementation of the GZipCodec .
htmlEscape → const HtmlEscape
A String converter that converts characters to HTML entities.
immutable → const Immutable
Used to annotate a class C. Indicates that C and all subtypes of C
must be immutable.
iOSHorizontalOffset → const int
An eyeballed value that moves the cursor slightly left of where it is
rendered for text on Android so its positioning more accurately matches the
native iOS text cursor positioning.
json → const JsonCodec
An instance of the default implementation of the JsonCodec .
kAlwaysCompleteAnimation → const Animation <double
An animation that is always complete.
kAlwaysDismissedAnimation → const Animation <double
An animation that is always dismissed.
kAndroidNumPadMap → const Map <int LogicalKeyboardKey
A map of Android key codes which have printable representations, but appear
on the number pad. Used to provide different key objects for keys like
KEY_EQUALS and NUMPAD_EQUALS.
kAndroidToLogicalKey → const Map <int LogicalKeyboardKey
Maps Android-specific key codes to the matching LogicalKeyboardKey .
kAndroidToPhysicalKey → const Map <int PhysicalKeyboardKey
Maps Android-specific scan codes to the matching PhysicalKeyboardKey .
kBottomNavigationBarHeight → const double
The height of the bottom navigation bar.
kDebugMode → const bool
A constant that is true if the application was compiled in debug mode.
kDefaultContentInsertionMimeTypes → const List <String
The default mime types to be used when allowedMimeTypes is not provided.
kDefaultFontSize → const double
The default font size if none is specified.
kDefaultRouteTraversalEdgeBehavior → const TraversalEdgeBehavior
The default value of Navigator.routeTraversalEdgeBehavior .
kElevationToShadow → const Map <int List <BoxShadow
Map of elevation offsets used by Material Design to BoxShadow definitions.
kFloatingActionButtonMargin → const double
The margin that a FloatingActionButton should leave between it and the
edge of the screen.
kFloatingActionButtonSegue → const Duration
The amount of time the FloatingActionButton takes to transition in or out.
kFloatingActionButtonTurnInterval → const double
The fraction of a circle the FloatingActionButton should turn when it enters.
kFlutterMemoryAllocationsEnabled → const bool
If true, Flutter objects dispatch the memory allocation events.
kFuchsiaToLogicalKey → const Map <int LogicalKeyboardKey
Maps Fuchsia-specific IDs to the matching LogicalKeyboardKey .
kFuchsiaToPhysicalKey → const Map <int PhysicalKeyboardKey
Maps Fuchsia-specific USB HID Usage IDs to the matching
PhysicalKeyboardKey .
kGlfwNumpadMap → const Map <int LogicalKeyboardKey
A map of GLFW key codes which have printable representations, but appear
on the number pad. Used to provide different key objects for keys like
KEY_EQUALS and NUMPAD_EQUALS.
kGlfwToLogicalKey → const Map <int LogicalKeyboardKey
Maps GLFW-specific key codes to the matching LogicalKeyboardKey .
kGtkNumpadMap → const Map <int LogicalKeyboardKey
A map of GTK key codes which have printable representations, but appear
on the number pad. Used to provide different key objects for keys like
KEY_EQUALS and NUMPAD_EQUALS.
kGtkToLogicalKey → const Map <int LogicalKeyboardKey
Maps GTK-specific key codes to the matching LogicalKeyboardKey .
kIosNumPadMap → const Map <int LogicalKeyboardKey
A map of iOS key codes which have printable representations, but appear
on the number pad. Used to provide different key objects for keys like
KEY_EQUALS and NUMPAD_EQUALS.
kIosSpecialLogicalMap → const Map <String LogicalKeyboardKey
Maps iOS specific string values of nonvisible keys to logical keys
kIosToLogicalKey → const Map <int LogicalKeyboardKey
A map of iOS key codes presenting LogicalKeyboardKey .
kIosToPhysicalKey → const Map <int PhysicalKeyboardKey
Maps iOS-specific key code values representing PhysicalKeyboardKey .
kIsWasm → const bool
A constant that is true if the application was compiled to WebAssembly.
kIsWeb → const bool
A constant that is true if the application was compiled to run on the web.
kLinuxToPhysicalKey → const Map <int PhysicalKeyboardKey
Maps XKB specific key code values representing PhysicalKeyboardKey .
kMacOsFunctionKeyMap → const Map <int LogicalKeyboardKey
A map of macOS key codes which are numbered function keys, so that they
can be excluded when asking "is the Fn modifier down?".
kMacOsNumPadMap → const Map <int LogicalKeyboardKey
A map of macOS key codes which have printable representations, but appear
on the number pad. Used to provide different key objects for keys like
KEY_EQUALS and NUMPAD_EQUALS.
kMacOsToLogicalKey → const Map <int LogicalKeyboardKey
A map of macOS key codes presenting LogicalKeyboardKey .
kMacOsToPhysicalKey → const Map <int PhysicalKeyboardKey
Maps macOS-specific key code values representing PhysicalKeyboardKey .
kMaterialEdges → const Map <MaterialType BorderRadius ?
The border radii used by the various kinds of material in Material Design.
kMaterialListPadding → const EdgeInsets
The padding added around material list items.
kMaxUnsignedSMI → const int
The largest SMI value.
kMiniButtonOffsetAdjustment → const double
If a FloatingActionButton is used on a Scaffold in certain positions,
it is moved kMiniButtonOffsetAdjustment pixels closer to the edge of the screen.
kMinInteractiveDimension → const double
The minimum dimension of any interactive region according to Material
guidelines.
kNoDefaultValue → const Object
Marker object indicating that a DiagnosticsNode has no default value.
kProfileMode → const bool
A constant that is true if the application was compiled in profile mode.
kProfilePlatformChannels → const bool
Controls whether platform channel usage can be debugged in release mode.
kRadialReactionAlpha → const int
The value of the alpha channel to use when drawing a circular material ink response.
kRadialReactionDuration → const Duration
The amount of time a circular material ink response should take to expand to its full size.
kRadialReactionRadius → const double
The default radius of a circular material ink response in logical pixels.
kReleaseMode → const bool
A constant that is true if the application was compiled in release mode.
kTabLabelPadding → const EdgeInsets
The horizontal padding included by Tab s.
kTabScrollDuration → const Duration
The duration of the horizontal scroll animation that occurs when a tab is tapped.
kTextHeightNone → const double
A TextStyle.height value that indicates the text span should take
the height defined by the font, which may not be exactly the height of
TextStyle.fontSize .
kTextTabBarHeight → const double
The height of a tab bar containing text.
kThemeAnimationDuration → const Duration
The duration over which theme changes animate by default.
kThemeChangeDuration → const Duration
The amount of time theme change animations should last.
kToolbarHeight → const double
The height of the toolbar component of the AppBar .
kWebLocationMap → const Map <String List <LogicalKeyboardKey ?
A map of Web KeyboardEvent keys which needs to be decided based on location,
typically for numpad keys and modifier keys. Used to provide different key
objects for keys like KEY_EQUALS and NUMPAD_EQUALS.
kWebNumPadMap → const Map <String LogicalKeyboardKey
A map of Web KeyboardEvent codes which have printable representations, but appear
on the number pad. Used to provide different key objects for keys like
KEY_EQUALS and NUMPAD_EQUALS.
kWebToLogicalKey → const Map <String LogicalKeyboardKey
Maps Web KeyboardEvent codes to the matching LogicalKeyboardKey .
kWebToPhysicalKey → const Map <String PhysicalKeyboardKey
Maps Web KeyboardEvent codes to the matching PhysicalKeyboardKey .
kWindowsNumPadMap → const Map <int LogicalKeyboardKey
A map of Windows KeyboardEvent codes which have printable representations, but appear
on the number pad. Used to provide different key objects for keys like
KEY_EQUALS and NUMPAD_EQUALS.
kWindowsToLogicalKey → const Map <int LogicalKeyboardKey
Maps Windows KeyboardEvent codes to the matching LogicalKeyboardKey .
kWindowsToPhysicalKey → const Map <int PhysicalKeyboardKey
Maps Windows KeyboardEvent codes to the matching PhysicalKeyboardKey .
latin1 → const Latin1Codec
An instance of the default implementation of the Latin1Codec .
mustCallSuper → const _MustCallSuper
Used to annotate an instance member (method, getter, setter, operator, or
field) m. Indicates that every invocation of a member that overrides m
must also invoke m. In addition, every method that overrides m is
implicitly annotated with this same annotation.
nonVirtual → const _NonVirtual
Used to annotate an instance member (method, getter, setter, operator, or
field) m in a class C or mixin M. Indicates that m should not be
overridden in any classes that extend or mixin C or M.
optionalTypeArgs → const _OptionalTypeArgs
Used to annotate a class, mixin, extension, function, method, or typedef
declaration C. Indicates that any type arguments declared on C are to
be treated as optional.
precisionErrorTolerance → const double
The epsilon of tolerable double precision error.
protected → const _Protected
Used to annotate an instance member in a class or mixin which is meant to
be visible only within the declaring library, and to other instance members
of the class or mixin, and their subtypes.
required → const Required
Used to annotate a named parameter p in a method or function f.
Indicates that every invocation of f must include an argument
corresponding to p, despite the fact that p would otherwise be an
optional parameter.
standardEasing → const Curve
The standard easing curve in the Material 2 specification.
staticIconProvider → const Object
Annotation for classes that only provide static const IconData instances.
systemEncoding → const SystemEncoding
The current system encoding.
unicodeBomCharacterRune → const int
The Unicode Byte Order Marker (BOM) character U+FEFF.
unicodeReplacementCharacterRune → const int
The Unicode Replacement character U+FFFD (�).
utf8 → const Utf8Codec
An instance of the default implementation of the Utf8Codec .
vg → const VectorGraphicUtilities
The VectorGraphicUtilities instance.
visibleForOverriding → const _VisibleForOverriding
Used to annotate an instance member that was made public so that it could be
overridden but that is not intended to be referenced from outside the
defining library.
visibleForTesting → const _VisibleForTesting
Used to annotate a declaration that was made public, so that it is more
visible than otherwise necessary, to make code testable.
widgetFactory → const _WidgetFactory
Annotation which marks a function as a widget factory for the purpose of
widget creation tracking.
zlib → const ZLibCodec
An instance of the default implementation of the ZLibCodec .
Functions
applyBoxFit (BoxFit fit , Size inputSize , Size outputSize → FittedSizes
Apply a BoxFit value.
axisDirectionIsReversed (AxisDirection axisDirection → bool
Returns whether traveling along the given axis direction visits coordinates
along that axis in numerically decreasing order.
axisDirectionToAxis (AxisDirection axisDirection → Axis
Returns the Axis that contains the given AxisDirection .
base64Decode (String source → Uint8List
Decodes base64 or base64url encoded bytes.
base64Encode (List <int bytes → String
Encodes bytes using base64 encoding.
base64UrlEncode (List <int bytes → String
Encodes bytes using base64url encoding.
basicLocaleListResolution (List <Locale ?preferredLocales , Iterable <Locale supportedLocales → Locale
The default locale resolution algorithm.
binarySearch <T extends Comparable <Object > (List <T > sortedList , T value → int
Returns the position of value in the sortedList, if it exists.
buildTextSpanWithSpellCheckSuggestions (TextEditingValue value , TextStyle ?style , TextStyle misspelledTextStyle , SpellCheckResults spellCheckResults → TextSpan
Builds the TextSpan tree given the current state of the text input and
spell check results.
childDragAnchorStrategy (Draggable <Object draggable , BuildContext context , Offset position → Offset
Display the feedback anchored at the position of the original child.
clampDouble (double x , double min , double max → double
Same as num.clamp but optimized for a non-null double .
combineKeyEventResults (Iterable <KeyEventResult results → KeyEventResult
Combine the results returned by multiple FocusOnKeyCallback s or
FocusOnKeyEventCallback s.
combineSemanticsInfo (List <InlineSpanSemanticsInformation infoList → List <InlineSpanSemanticsInformation
Combines _semanticsInfo entries where permissible.
compute <M , R > (ComputeCallback <M , R > callback , M message , {String ?debugLabel → Future <R >
Asynchronously runs the given callback - with the provided message -
in the background and completes with the result.
consolidateHttpClientResponseBytes (HttpClientResponse response , {bool autoUncompress = true , BytesReceivedCallback ?onBytesReceived → Future <Uint8List
Efficiently converts the response body of an HttpClientResponse into a
Uint8List .
createLocalImageConfiguration (BuildContext context , {Size ?size → ImageConfiguration
Creates an ImageConfiguration based on the given BuildContext (and
optionally size).
debugAssertAllFoundationVarsUnset (String reason , {DebugPrintCallback debugPrintOverride = debugPrintThrottled → bool
Returns true if none of the foundation library debug variables have been
changed.
debugAssertAllPaintingVarsUnset (String reason , {bool debugDisableShadowsOverride = false → bool
Returns true if none of the painting library debug variables have been changed.
debugAssertAllServicesVarsUnset (String reason → bool
Returns true if none of the widget library debug variables have been changed.
debugAssertAllWidgetVarsUnset (String reason → bool
Returns true if none of the widget library debug variables have been changed.
debugCheckHasDirectionality (BuildContext context , {String ?why , String ?hint , String ?alternative → bool
Asserts that the given context has a Directionality ancestor.
debugCheckHasMaterial (BuildContext context → bool
Asserts that the given context has a Material ancestor within the closest
LookupBoundary .
debugCheckHasMaterialLocalizations (BuildContext context → bool
Asserts that the given context has a Localizations ancestor that contains
a MaterialLocalizations delegate.
debugCheckHasMediaQuery (BuildContext context → bool
Asserts that the given context has a MediaQuery ancestor.
debugCheckHasOverlay (BuildContext context → bool
Asserts that the given context has an Overlay ancestor.
debugCheckHasScaffold (BuildContext context → bool
Asserts that the given context has a Scaffold ancestor.
debugCheckHasScaffoldMessenger (BuildContext context → bool
Asserts that the given context has a ScaffoldMessenger ancestor.
debugCheckHasTable (BuildContext context → bool
Asserts that the given context has a Table ancestor.
debugCheckHasWidgetsLocalizations (BuildContext context → bool
Asserts that the given context has a Localizations ancestor that contains
a WidgetsLocalizations delegate.
debugChildrenHaveDuplicateKeys (Widget parent , Iterable <Widget children , {String ?message → bool
Asserts if the given child list contains any duplicate non-null keys.
debugDescribeFocusTree ()
→ String
Returns a text representation of the current focus tree, along with the
current attributes on each node.
debugDescribeTransform (Matrix4 ?transform → List <String
Returns a list of strings representing the given transform in a format
useful for TransformProperty .
debugDumpApp ()
→ void
Print a string representation of the currently running app.
debugDumpFocusTree ()
→ void
Prints a text representation of the current focus tree, along with the
current attributes on each node.
debugDumpLayerTree ()
→ void
Prints a textual representation of the layer trees.
debugDumpRenderTree ()
→ void
Prints a textual representation of the render trees.
debugFlushLastFrameImageSizeInfo ()
→ void
Flushes inter-frame tracking of image size information from paintImage .
debugFormatDouble (double ?value → String
Formats a double to have standard formatting.
debugInstrumentAction <T > (String description , Future <T > action ()→ Future <T >
Runs the specified action, timing how long the action takes in debug
builds when debugInstrumentationEnabled is true.
debugIsLocalCreationLocation (Object object → bool
Returns if an object is user created.
debugIsSerializableForRestoration (Object ?object → bool
Returns true when the provided object is serializable for state
restoration.
debugIsWidgetLocalCreation (Widget widget → bool
Returns true if a Widget is user created.
debugItemsHaveDuplicateKeys (Iterable <Widget items → bool
Asserts if the given list of items contains any duplicate non-null keys.
debugPrintStack ({StackTrace ?stackTrace , String ?label , int ?maxFrames → void
Dump the stack to the console using debugPrint and
FlutterError.defaultStackFilter .
debugPrintSynchronously (String ?message , {int ?wrapWidth → void
Alternative implementation of debugPrint that does not throttle.
Used by tests.
debugPrintThrottled (String ?message , {int ?wrapWidth → void
Implementation of debugPrint that throttles messages. This avoids dropping
messages on platforms that rate-limit their logging (for example, Android).
debugTransformDebugCreator (Iterable <DiagnosticsNode properties → Iterable <DiagnosticsNode
Transformer to parse and gather information about DiagnosticsDebugCreator .
debugWidgetBuilderValue (Widget widget , Widget ?built → void
Asserts that the built widget is not null.
debugWordWrap (String message , int width , {String wrapIndent = '' → Iterable <String
Wraps the given string at the given width.
decodeImageFromList (Uint8List bytes → Future <Image
Creates an image from a list of bytes.
defaultScrollNotificationPredicate (ScrollNotification notification → bool
A ScrollNotificationPredicate that checks whether
notification.depth == 0, which means that the notification did not bubble
through any intervening scrolling widgets.
describeEnum (Object enumEntry → String
Returns a short description of an enum value.
describeIdentity (Object ?object → String
Returns a summary of the runtime type and hash code of object.
exit (int code → Never
Exit the Dart VM process immediately with the given exit code.
flipAxis (Axis direction → Axis
Returns the opposite of the given Axis .
flipAxisDirection (AxisDirection axisDirection → AxisDirection
Returns the opposite of the given AxisDirection .
getAxisDirectionFromAxisReverseAndDirectionality (BuildContext context , Axis axis , bool reverse → AxisDirection
Returns the AxisDirection in the given Axis in the current
Directionality (or the reverse if reverse is true).
hourFormat ({required TimeOfDayFormat of → HourFormat
The HourFormat used for the given TimeOfDayFormat .
intentForMacOSSelector (String selectorName → Intent ?
Maps the selector from NSStandardKeyBindingResponding to the Intent if the
selector is recognized.
jsonDecode (String source , {Object ?reviver (Object ?key , Object ?value → dynamic
Parses the string and returns the resulting Json object.
jsonEncode (Object ?object , {Object ?toEncodable (Object ?nonEncodable → String
Converts object to a JSON string.
lerpDuration (Duration a , Duration b , double t → Duration
Linearly interpolate between two Durations.
lerpFontVariations (List <FontVariation ?a , List <FontVariation ?b , double t → List <FontVariation ?
Interpolate between two lists of FontVariation objects.
listEquals <T > (List <T > ?a , List <T > ?b → bool
Compares two lists for element-by-element equality.
mapEquals <T , U > (Map <T , U > ?a , Map <T , U > ?b → bool
Compares two maps for element-by-element equality.
mergeSort <T > (List <T > list , {int start = 0 , int ?end , int compare (T , T → void
Sorts a list between start (inclusive) and end (exclusive) using the
merge sort algorithm.
objectRuntimeType (Object ?object , String optimizedValue → String
Framework code should use this method in favor of calling toString on
Object.runtimeType .
paintBorder (Canvas canvas , Rect rect , {BorderSide top = BorderSide.none , BorderSide right = BorderSide.none , BorderSide bottom = BorderSide.none , BorderSide left = BorderSide.none → void
Paints a border around the given rectangle on the canvas.
paintImage ({required Canvas canvas , required Rect rect , required Image image , String ?debugImageLabel , double scale = 1.0 , double opacity = 1.0 , ColorFilter ?colorFilter , BoxFit ?fit , Alignment alignment = Alignment.center , Rect ?centerSlice , ImageRepeat repeat = ImageRepeat.noRepeat , bool flipHorizontally = false , bool invertColors = false , FilterQuality filterQuality = FilterQuality.medium , bool isAntiAlias = false , BlendMode blendMode = BlendMode.srcOver → void
Paints an image into the given rectangle on the canvas.
paintZigZag (Canvas canvas , Paint paint , Offset start , Offset end , int zigs , double width → void
Draw a line between two points, which cuts diagonally back and forth across
the line that connects the two points.
pointerDragAnchorStrategy (Draggable <Object draggable , BuildContext context , Offset position → Offset
Display the feedback anchored at the position of the touch that started
the drag.
positionDependentBox ({required Size size , required Size childSize , required Offset target , required bool preferBelow , double verticalOffset = 0.0 , double margin = 10.0 → Offset
Position a child box within a container box, either above or below a target
point.
precacheImage (ImageProvider <Object provider , BuildContext context , {Size ?size , ImageErrorListener ?onError → Future <void >
Prefetches an image into the image cache.
runApp (Widget app → void
Inflate the given widget and attach it to the view.
runeToLowerCase (int rune → int
Convert a UTF32 rune to its lower case.
runWidget (Widget app → void
Inflate the given widget and bootstrap the widget tree.
runZoned <R > (R body (), {Map <Object ?Object ? ?zoneValues , ZoneSpecification ?zoneSpecification , Function ?onError → R
Runs body in its own zone.
runZonedGuarded <R > (R body (), void onError (Object error , StackTrace stack Map <Object ?Object ? ?zoneValues , ZoneSpecification ?zoneSpecification → R?
Runs body in its own error zone.
scheduleMicrotask (void callback ()→ void
Runs a function asynchronously.
setEquals <T > (Set <T > ?a , Set <T > ?b → bool
Compares two sets for element-by-element equality.
shortHash (Object ?object → String
Returns a 5 character long hexadecimal string generated from
Object.hashCode 's 20 least-significant bits.
showAboutDialog ({required BuildContext context , String ?applicationName , String ?applicationVersion , Widget ?applicationIcon , String ?applicationLegalese , List <Widget ?children , bool barrierDismissible = true , Color ?barrierColor , String ?barrierLabel , bool useRootNavigator = true , RouteSettings ?routeSettings , Offset ?anchorPoint → void
Displays an AboutDialog , which describes the application and provides a
button to show licenses for software used by the application.
showAdaptiveDialog <T > ({required BuildContext context , required WidgetBuilder builder , bool ?barrierDismissible , Color ?barrierColor , String ?barrierLabel , bool useSafeArea = true , bool useRootNavigator = true , RouteSettings ?routeSettings , Offset ?anchorPoint , TraversalEdgeBehavior ?traversalEdgeBehavior → Future <T? >
Displays either a Material or Cupertino dialog depending on platform.
showBottomSheet ({required BuildContext context , required WidgetBuilder builder , Color ?backgroundColor , double ?elevation , ShapeBorder ?shape , Clip ?clipBehavior , BoxConstraints ?constraints , bool ?enableDrag , bool ?showDragHandle , AnimationController ?transitionAnimationController , AnimationStyle ?sheetAnimationStyle → PersistentBottomSheetController
Shows a Material Design bottom sheet in the nearest Scaffold ancestor. To
show a persistent bottom sheet, use the Scaffold.bottomSheet .
showDatePicker ({required BuildContext context , DateTime ?initialDate , required DateTime firstDate , required DateTime lastDate , DateTime ?currentDate , DatePickerEntryMode initialEntryMode = DatePickerEntryMode.calendar , SelectableDayPredicate ?selectableDayPredicate , String ?helpText , String ?cancelText , String ?confirmText , Locale ?locale , bool barrierDismissible = true , Color ?barrierColor , String ?barrierLabel , bool useRootNavigator = true , RouteSettings ?routeSettings , TextDirection ?textDirection , TransitionBuilder ?builder , DatePickerMode initialDatePickerMode = DatePickerMode.day , String ?errorFormatText , String ?errorInvalidText , String ?fieldHintText , String ?fieldLabelText , TextInputType ?keyboardType , Offset ?anchorPoint , ValueChanged <DatePickerEntryMode ?onDatePickerModeChange , Icon ?switchToInputEntryModeIcon , Icon ?switchToCalendarEntryModeIcon → Future <DateTime ?
Shows a dialog containing a Material Design date picker.
showDateRangePicker ({required BuildContext context , DateTimeRange ?initialDateRange , required DateTime firstDate , required DateTime lastDate , DateTime ?currentDate , DatePickerEntryMode initialEntryMode = DatePickerEntryMode.calendar , String ?helpText , String ?cancelText , String ?confirmText , String ?saveText , String ?errorFormatText , String ?errorInvalidText , String ?errorInvalidRangeText , String ?fieldStartHintText , String ?fieldEndHintText , String ?fieldStartLabelText , String ?fieldEndLabelText , Locale ?locale , bool barrierDismissible = true , Color ?barrierColor , String ?barrierLabel , bool useRootNavigator = true , RouteSettings ?routeSettings , TextDirection ?textDirection , TransitionBuilder ?builder , Offset ?anchorPoint , TextInputType keyboardType = TextInputType.datetime , Icon ?switchToInputEntryModeIcon , Icon ?switchToCalendarEntryModeIcon , SelectableDayForRangePredicate ?selectableDayPredicate → Future <DateTimeRange ?
Shows a full screen modal dialog containing a Material Design date range
picker.
showDialog <T > ({required BuildContext context , required WidgetBuilder builder , bool barrierDismissible = true , Color ?barrierColor , String ?barrierLabel , bool useSafeArea = true , bool useRootNavigator = true , RouteSettings ?routeSettings , Offset ?anchorPoint , TraversalEdgeBehavior ?traversalEdgeBehavior → Future <T? >
Displays a Material dialog above the current contents of the app, with
Material entrance and exit animations, modal barrier color, and modal
barrier behavior (dialog is dismissible with a tap on the barrier).
showGeneralDialog <T extends Object ? > ({required BuildContext context , required RoutePageBuilder pageBuilder , bool barrierDismissible = false , String ?barrierLabel , Color barrierColor = const Color(0x80000000) , Duration transitionDuration = const Duration(milliseconds: 200) , RouteTransitionsBuilder ?transitionBuilder , bool useRootNavigator = true , RouteSettings ?routeSettings , Offset ?anchorPoint → Future <T? >
Displays a dialog above the current contents of the app.
showLicensePage ({required BuildContext context , String ?applicationName , String ?applicationVersion , Widget ?applicationIcon , String ?applicationLegalese , bool useRootNavigator = false → void
Displays a LicensePage , which shows licenses for software used by the
application.
Show a popup menu that contains the items at position.
showModalBottomSheet <T > ({required BuildContext context , required WidgetBuilder builder , Color ?backgroundColor , String ?barrierLabel , double ?elevation , ShapeBorder ?shape , Clip ?clipBehavior , BoxConstraints ?constraints , Color ?barrierColor , bool isScrollControlled = false , double scrollControlDisabledMaxHeightRatio = _defaultScrollControlDisabledMaxHeightRatio , bool useRootNavigator = false , bool isDismissible = true , bool enableDrag = true , bool ?showDragHandle , bool useSafeArea = false , RouteSettings ?routeSettings , AnimationController ?transitionAnimationController , Offset ?anchorPoint , AnimationStyle ?sheetAnimationStyle → Future <T? >
Shows a modal Material Design bottom sheet.
showSearch <T > ({required BuildContext context , required SearchDelegate <T > delegate , String ?query = '' , bool useRootNavigator = false , bool maintainState = false → Future <T? >
Shows a full screen search page and returns the search result selected by
the user when the page is closed.
showTimePicker ({required BuildContext context , required TimeOfDay initialTime , TransitionBuilder ?builder , bool barrierDismissible = true , Color ?barrierColor , String ?barrierLabel , bool useRootNavigator = true , TimePickerEntryMode initialEntryMode = TimePickerEntryMode.dial , String ?cancelText , String ?confirmText , String ?helpText , String ?errorInvalidText , String ?hourLabelText , String ?minuteLabelText , RouteSettings ?routeSettings , EntryModeChangeCallback ?onEntryModeChanged , Offset ?anchorPoint , Orientation ?orientation → Future <TimeOfDay ?
Shows a dialog containing a Material Design time picker.
sleep (Duration duration → void
Sleep for the duration specified in duration.
stdioType (dynamic object → StdioType
Whether a stream is attached to a file, pipe, terminal, or
something else.
textDirectionToAxisDirection (TextDirection textDirection → AxisDirection
Returns the AxisDirection in which reading occurs in the given TextDirection .
toBeginningOfSentenceCase <T extends String ? > (T input , [String ?locale → T
Convert a string to beginning of sentence case, in a way appropriate to the
locale.
unawaited (Future <void > ?future → void
Explicitly ignores a future.
Typedefs
ActionListenerCallback
= void Function(Action <Intent action
The kind of callback that an Action uses to notify of changes to the
action's state.
AnimatableCallback T >
= T Function(double value
A typedef used by Animatable.fromCallback to create an Animatable
from a callback.
AnimatedCrossFadeBuilder
= Widget Function(Widget topChild , Key topChildKey , Widget bottomChild , Key bottomChildKey
Signature for the AnimatedCrossFade.layoutBuilder callback.
AnimatedItemBuilder
= Widget Function(BuildContext context , int index , Animation <double animation
Signature for the builder callback used by AnimatedList , AnimatedList.separated
& AnimatedGrid to build their animated children.
AnimatedRemovedItemBuilder
= Widget Function(BuildContext context , Animation <double animation
Signature for the builder callback used in AnimatedListState.removeItem and
AnimatedGridState.removeItem to animate their children after they have
been removed.
AnimatedSwitcherLayoutBuilder
= Widget Function(Widget ?currentChild , List <Widget previousChildren
Signature for builders used to generate custom layouts for
AnimatedSwitcher .
AnimatedSwitcherTransitionBuilder
= Widget Function(Widget child , Animation <double animation
Signature for builders used to generate custom transitions for
AnimatedSwitcher .
AnimatedTransitionBuilder
= Widget Function(BuildContext context , Animation <double animation , Widget ?child
Builder callback used by DualTransitionBuilder .
AnimationStatusListener
= void Function(AnimationStatus status
Signature for listeners attached using Animation.addStatusListener .
AppExitRequestCallback
= Future <AppExitResponse Function()
A callback type that is used by AppLifecycleListener.onExitRequested to
ask the application if it wants to cancel application termination or not.
AppPrivateCommandCallback
= void Function(String action , Map <String dynamic > data
Signature for the callback that reports the app private command results.
AsyncCallback
= Future <void > Function()
Signature of callbacks that have no arguments and return no data, but that
return a Future to indicate when their work is complete.
AsyncValueGetter T >
= Future <T > Function()
Signature for callbacks that are to asynchronously report a value on demand.
AsyncValueSetter T >
= Future <void > Function(T value
Signature for callbacks that report that a value has been set and return a
Future that completes when the value has been saved.
AsyncWidgetBuilder T >
= Widget Function(BuildContext context , AsyncSnapshot <T > snapshot
Signature for strategies that build widgets based on asynchronous
interaction.
AutocompleteFieldViewBuilder
= Widget Function(BuildContext context , TextEditingController textEditingController , FocusNode focusNode , VoidCallback onFieldSubmitted
The type of the Autocomplete callback which returns the widget that
contains the input TextField or TextFormField .
AutocompleteOnSelected T extends Object >
= void Function(T option
The type of the callback used by the RawAutocomplete widget to indicate
that the user has selected an option.
AutocompleteOptionsBuilder T extends Object >
= FutureOr <Iterable <T > Function(TextEditingValue textEditingValue
The type of the RawAutocomplete callback which computes the list of
optional completions for the widget's field, based on the text the user has
entered so far.
AutocompleteOptionsViewBuilder T extends Object >
= Widget Function(BuildContext context , AutocompleteOnSelected <T > onSelected , Iterable <T > options
The type of the RawAutocomplete callback which returns a Widget that
displays the specified options and calls onSelected if the user
selects an option.
AutocompleteOptionToString T extends Object >
= String Function(T option
The type of the RawAutocomplete callback that converts an option value to
a string which can be displayed in the widget's options menu.
BadCertificateCallback
= bool Function(X509Certificate cr , String host , int port
BottomSheetDragEndHandler
= void Function(DragEndDetails details , {required bool isClosing
A callback for when the user stops dragging the bottom sheet.
BottomSheetDragStartHandler
= void Function(DragStartDetails details
A callback for when the user begins dragging the bottom sheet.
BoxConstraintsTransform
= BoxConstraints Function(BoxConstraints constraints
Signature for a function that transforms a BoxConstraints to another
BoxConstraints .
ButtonLayerBuilder
= Widget Function(BuildContext context , Set <MaterialState states , Widget ?child
The type for ButtonStyle.backgroundBuilder and ButtonStyle.foregroundBuilder .
ByteConversionSinkBase ByteConversionSink
This class provides a base-class for converters that need to accept byte
inputs.
BytesReceivedCallback
= void Function(int cumulative , int ?total
Signature for getting notified when chunks of bytes are received while
consolidating the bytes of an HttpClientResponse into a Uint8List .
ChildIndexGetter
= int ? Function(Key key
Called to find the new index of a child based on its key in case of
reordering.
ComputeCallback M , R >
= FutureOr <R > Function(M message
Signature for the callback passed to compute .
ComputeImpl
= Future <R > Function<M , R >(ComputeCallback <M , R > callback , M message , {String ?debugLabel
The signature of compute , which spawns an isolate, runs callback on
that isolate, passes it message, and (eventually) returns the value
returned by callback.
ComputePropertyValueCallback T >
= T? Function()
Signature for computing the value of a property.
ConditionalElementVisitor
= bool Function(Element element
Signature for the callback to BuildContext.visitAncestorElements .
ConfirmDismissCallback
= Future <bool ? Function(DismissDirection direction
Signature used by Dismissible to give the application an opportunity to
confirm or veto a dismiss gesture.
ControllerCallback
= void Function()
Type of a stream controller's onListen, onPause and onResume
callbacks.
ControllerCancelCallback
= FutureOr <void > Function()
Type of stream controller onCancel callbacks.
ControlsWidgetBuilder
= Widget Function(BuildContext context , ControlsDetails details
A builder that creates a widget given the two callbacks onStepContinue and
onStepCancel.
CreatePeriodicTimerHandler
= Timer Function(Zone self , ZoneDelegate parent , Zone zone , Duration period , void f (Timer timer
The type of a custom Zone.createPeriodicTimer implementation function.
CreatePlatformViewCallback
= PlatformViewController Function(PlatformViewCreationParams params
Constructs a PlatformViewController .
CreateRectTween
= Tween <Rect ? Function(Rect ?begin , Rect ?end
Signature for a function that takes two Rect instances and returns a
RectTween that transitions between them.
CreateTimerHandler
= Timer Function(Zone self , ZoneDelegate parent , Zone zone , Duration duration , void f ()
The type of a custom Zone.createTimer implementation function.
DataColumnSortCallback
= void Function(int columnIndex , bool ascending
Signature for DataColumn.onSort callback.
DebugPrintCallback
= void Function(String ?message , {int ?wrapWidth
Signature for debugPrint implementations.
DecoderBufferCallback
= Future <Codec Function(ImmutableBuffer buffer , {bool allowUpscaling , int ?cacheHeight , int ?cacheWidth
Performs the decode process for use in ImageProvider.loadBuffer .
DelegatedTransitionBuilder
= Widget ? Function(BuildContext context , Animation <double animation , Animation <double secondaryAnimation , bool allowSnapshotting , Widget ?child
Signature for a builder used to control a page's exit transition.
DiagnosticPropertiesTransformer
= Iterable <DiagnosticsNode Function(Iterable <DiagnosticsNode properties
Signature for DiagnosticPropertiesBuilder transformer.
DidRemovePageCallback
= void Function(Page <Object ? page
Signature for the Navigator.onDidRemovePage callback.
DismissDirectionCallback
= void Function(DismissDirection direction
Signature used by Dismissible to indicate that it has been dismissed in
the given direction.
DismissUpdateCallback
= void Function(DismissUpdateDetails details
Signature used by Dismissible to indicate that the dismissible has been dragged.
DragAnchorStrategy
= Offset Function(Draggable <Object draggable , BuildContext context , Offset position
Signature for the strategy that determines the drag start point of a Draggable .
DragEndCallback
= void Function(DraggableDetails details
Signature for when the draggable is dropped.
DraggableCanceledCallback
= void Function(Velocity velocity , Offset offset
Signature for when a Draggable is dropped without being accepted by a DragTarget .
DragTargetAccept T >
= void Function(T data
Signature for causing a DragTarget to accept the given data.
DragTargetAcceptWithDetails T >
= void Function(DragTargetDetails <T > details
Signature for determining information about the acceptance by a DragTarget .
DragTargetBuilder T >
= Widget Function(BuildContext context , List <T? > candidateData , List rejectedData
Signature for building children of a DragTarget .
DragTargetLeave T >
= void Function(T? data
Signature for when a Draggable leaves a DragTarget .
DragTargetMove T >
= void Function(DragTargetDetails <T > details
Signature for when a Draggable moves within a DragTarget .
DragTargetWillAccept T >
= bool Function(T? data
Signature for determining whether the given data will be accepted by a DragTarget .
DragTargetWillAcceptWithDetails T >
= bool Function(DragTargetDetails <T > details
Signature for determining whether the given data will be accepted by a DragTarget ,
based on provided information.
DragUpdateCallback
= void Function(DragUpdateDetails details
Signature for when a Draggable is dragged across the screen.
DrawerCallback
= void Function(bool isOpened
Signature for the callback that's called when a DrawerController is
opened or closed.
DropdownButtonBuilder
= List <Widget Function(BuildContext context
A builder to customize dropdown buttons.
Signature for a widget builder that builds a context menu for the given
EditableTextState .
ElementCreatedCallback
= void Function(Object element
The signature of the function that gets called when the HtmlElementView
DOM element is created.
ElementVisitor
= void Function(Element element
Signature for the callback to BuildContext.visitChildElements .
EntryModeChangeCallback
= void Function(TimePickerEntryMode mode
Signature for when the time picker entry mode is changed.
ErrorCallbackHandler
= AsyncError ? Function(Zone self , ZoneDelegate parent , Zone zone , Object error , StackTrace ?stackTrace
The type of a custom Zone.errorCallback implementation function.
ErrorWidgetBuilder
= Widget Function(FlutterErrorDetails details
Signature for the constructor that is called when an error occurs while
building a widget.
ExpansionPanelCallback
= void Function(int panelIndex , bool isExpanded
Signature for the callback that's called when an ExpansionPanel is
expanded or collapsed.
Signature for the callback that's called when the header of the
ExpansionPanel needs to rebuild.
FilterCallback T >
= List <DropdownMenuEntry <T > Function(List <DropdownMenuEntry <T > entries , String filter
A callback function that returns the list of the items that matches the
current applied filter.
FlutterExceptionHandler
= void Function(FlutterErrorDetails details
Signature for FlutterError.onError handler.
FocusOnKeyCallback
= KeyEventResult Function(FocusNode node , RawKeyEvent event
Signature of a callback used by Focus.onKey and FocusScope.onKey
to receive key events.
FocusOnKeyEventCallback
= KeyEventResult Function(FocusNode node , KeyEvent event
Signature of a callback used by Focus.onKeyEvent and FocusScope.onKeyEvent
to receive key events.
FontSizeResolver
= double Function(num fontSize , ScreenUtil instance
ForkHandler
= Zone Function(Zone self , ZoneDelegate parent , Zone zone , ZoneSpecification ?specification , Map <Object ?Object ? ?zoneValues
The type of a custom Zone.fork implementation function.
FormFieldBuilder T >
= Widget Function(FormFieldState <T > field
Signature for building the widget representing the form field.
FormFieldSetter T >
= void Function(T? newValue
Signature for being notified when a form field changes value.
FormFieldValidator T >
= String ? Function(T? value
Signature for validating a form field.
GenerateAppTitle
= String Function(BuildContext context
The signature of WidgetsApp.onGenerateTitle .
GestureDragCancelCallback
= void Function()
Signature for when the pointer that previously triggered a
GestureDragDownCallback did not complete.
GestureDragDownCallback
= void Function(DragDownDetails details
Signature for when a pointer has contacted the screen and might begin to
move.
GestureDragEndCallback
= void Function(DragEndDetails details
Signature for when a pointer that was previously in contact with the screen
and moving is no longer in contact with the screen.
GestureDragStartCallback
= void Function(DragStartDetails details
Signature for when a pointer has contacted the screen and has begun to move.
GestureDragUpdateCallback
= void Function(DragUpdateDetails details
Signature for when a pointer that is in contact with the screen and moving
has moved again.
GestureForcePressEndCallback
= void Function(ForcePressDetails details
Signature for when the pointer that previously triggered a
ForcePressGestureRecognizer.onStart callback is no longer in contact
with the screen.
GestureForcePressPeakCallback
= void Function(ForcePressDetails details
Signature used by ForcePressGestureRecognizer for when a pointer that has
pressed with at least ForcePressGestureRecognizer.peakPressure .
GestureForcePressStartCallback
= void Function(ForcePressDetails details
Signature used by a ForcePressGestureRecognizer for when a pointer has
pressed with at least ForcePressGestureRecognizer.startPressure .
GestureForcePressUpdateCallback
= void Function(ForcePressDetails details
Signature used by ForcePressGestureRecognizer during the frames
after the triggering of a ForcePressGestureRecognizer.onStart callback.
GestureLongPressCallback
= void Function()
Callback signature for LongPressGestureRecognizer.onLongPress .
GestureLongPressEndCallback
= void Function(LongPressEndDetails details
Callback signature for LongPressGestureRecognizer.onLongPressEnd .
GestureLongPressMoveUpdateCallback
= void Function(LongPressMoveUpdateDetails details
Callback signature for LongPressGestureRecognizer.onLongPressMoveUpdate .
GestureLongPressStartCallback
= void Function(LongPressStartDetails details
Callback signature for LongPressGestureRecognizer.onLongPressStart .
GestureLongPressUpCallback
= void Function()
Callback signature for LongPressGestureRecognizer.onLongPressUp .
GestureRecognizerFactoryConstructor T extends GestureRecognizer >
= T Function()
Signature for closures that implement GestureRecognizerFactory.constructor .
GestureRecognizerFactoryInitializer T extends GestureRecognizer >
= void Function(T instance
Signature for closures that implement GestureRecognizerFactory.initializer .
GestureScaleEndCallback
= void Function(ScaleEndDetails details
Signature for when the pointers are no longer in contact with the screen.
GestureScaleStartCallback
= void Function(ScaleStartDetails details
Signature for when the pointers in contact with the screen have established
a focal point and initial scale of 1.0.
GestureScaleUpdateCallback
= void Function(ScaleUpdateDetails details
Signature for when the pointers in contact with the screen have indicated a
new focal point and/or scale.
GestureTapCallback
= void Function()
Signature for when a tap has occurred.
GestureTapCancelCallback
= void Function()
Signature for when the pointer that previously triggered a
GestureTapDownCallback will not end up causing a tap.
GestureTapDownCallback
= void Function(TapDownDetails details
Signature for when a pointer that might cause a tap has contacted the
screen.
GestureTapUpCallback
= void Function(TapUpDetails details
Signature for when a pointer that will trigger a tap has stopped contacting
the screen.
HandleUncaughtErrorHandler
= void Function(Zone self , ZoneDelegate parent , Zone zone , Object error , StackTrace stackTrace
The type of a custom Zone.handleUncaughtError implementation function.
HeroFlightShuttleBuilder
= Widget Function(BuildContext flightContext , Animation <double animation , HeroFlightDirection flightDirection , BuildContext fromHeroContext , BuildContext toHeroContext
A function that lets Hero es self supply a Widget that is shown during the
hero's flight from one route to another instead of default (which is to
show the destination route's instance of the Hero).
HeroPlaceholderBuilder
= Widget Function(BuildContext context , Size heroSize , Widget child
Signature for a function that builds a Hero placeholder widget given a
child and a Size .
HttpClientProvider
= HttpClient Function()
Signature for a method that returns an HttpClient .
ImageChunkListener
= void Function(ImageChunkEvent event
Signature for listening to ImageChunkEvent events.
ImageDecoderCallback
= Future <Codec Function(ImmutableBuffer buffer , {TargetImageSizeCallback ?getTargetSize
Performs the decode process for use in ImageProvider.loadImage .
ImageErrorListener
= void Function(Object exception , StackTrace ?stackTrace
Signature for reporting errors when resolving images.
ImageErrorWidgetBuilder
= Widget Function(BuildContext context , Object error , StackTrace ?stackTrace
Signature used by Image.errorBuilder to create a replacement widget to
render instead of the image.
ImageFrameBuilder
= Widget Function(BuildContext context , Widget child , int ?frame , bool wasSynchronouslyLoaded
Signature used by Image.frameBuilder to control the widget that will be
used when an Image is built.
ImageListener
= void Function(ImageInfo image , bool synchronousCall
Signature for callbacks reporting that an image is available.
ImageLoadingBuilder
= Widget Function(BuildContext context , Widget child , ImageChunkEvent ?loadingProgress
Signature used by Image.loadingBuilder to build a representation of the
image's loading progress.
ImageWidgetBuilder
= Widget Function(BuildContext context , ImageProvider <Object imageProvider
Builder function to create an image widget. The function is called after
the ImageProvider completes the image loading.
IndexedWidgetBuilder
= Widget Function(BuildContext context , int index
Signature for a function that creates a widget for a given index, e.g., in a
list.
InformationCollector
= Iterable <DiagnosticsNode Function()
Signature for FlutterErrorDetails.informationCollector callback
and other callbacks that collect information describing an error.
InitialRouteListFactory
= List <Route Function(String initialRoute
The signature of WidgetsApp.onGenerateInitialRoutes .
InlineSpanVisitor
= bool Function(InlineSpan span
Called on each span as InlineSpan.visitChildren walks the InlineSpan tree.
InputCounterWidgetBuilder
= Widget ? Function(BuildContext context , {required int currentLength , required bool isFocused , required int ?maxLength
Signature for the TextField.buildCounter callback.
InspectorSelectButtonBuilder
= Widget Function(BuildContext context , VoidCallback onPressed
Signature for the builder callback used by
WidgetInspector.selectButtonBuilder .
InspectorSelectionChangedCallback
= void Function()
Signature for the selection change callback used by
WidgetInspectorService.selectionChangedCallback .
InteractiveViewerWidgetBuilder
= Widget Function(BuildContext context , Quad viewport
A signature for widget builders that take a Quad of the current viewport.
IterableFilter T >
= Iterable <T > Function(Iterable <T > input
Signature for callbacks that filter an iterable.
KeyEventCallback
= bool Function(KeyEvent event
The signature for HardwareKeyboard.addHandler , a callback to decide whether
the entire framework handles a key event.
KeyMessageHandler
= bool Function(KeyMessage message
The signature for KeyEventManager.keyMessageHandler .
LayoutWidgetBuilder
= Widget Function(BuildContext context , BoxConstraints constraints
The signature of the LayoutBuilder builder function.
LicenseEntryCollector
= Stream <LicenseEntry Function()
Signature for callbacks passed to LicenseRegistry.addLicense .
LoadingErrorWidgetBuilder
= Widget Function(BuildContext context , String url , Object error
Builder function to create an error widget. This builder is called when
the image failed loading, for example due to a 404 NotFound exception.
LocaleListResolutionCallback
= Locale ? Function(List <Locale ?locales , Iterable <Locale supportedLocales
The signature of WidgetsApp.localeListResolutionCallback .
LocaleResolutionCallback
= Locale ? Function(Locale ?locale , Iterable <Locale supportedLocales
The signature of WidgetsApp.localeResolutionCallback .
MagnifierBuilder
= Widget ? Function(BuildContext context , MagnifierController controller , ValueNotifier <MagnifierInfo magnifierInfo
Signature for a builder that builds a Widget with a MagnifierController .
MaterialPropertyResolver T >
= WidgetPropertyResolver <T >
Signature for the function that returns a value of type T based on a given
set of states.
MaterialState WidgetState
Interactive states that some of the Material widgets can take on when
receiving input from the user.
MaterialStateBorderSide WidgetStateBorderSide
Defines a BorderSide whose value depends on a set of MaterialState s
which represent the interactive state of a component.
MaterialStateColor WidgetStateColor
Defines a Color that is also a MaterialStateProperty .
MaterialStateMouseCursor WidgetStateMouseCursor
Defines a MouseCursor whose value depends on a set of MaterialState s which
represent the interactive state of a component.
MaterialStateOutlinedBorder WidgetStateOutlinedBorder
Defines an OutlinedBorder whose value depends on a set of MaterialState s
which represent the interactive state of a component.
MaterialStateProperty T >
= WidgetStateProperty <T >
Interface for classes that resolve to a value of type T based
on a widget's interactive "state", which is defined as a set
of MaterialState s.
MaterialStatePropertyAll T >
= WidgetStatePropertyAll <T >
Convenience class for creating a MaterialStateProperty that
resolves to the given value for all states.
MaterialStatesController WidgetStatesController
Manages a set of MaterialState s and notifies listeners of changes.
MaterialStateTextStyle WidgetStateTextStyle
Defines a TextStyle that is also a MaterialStateProperty .
MemoryAllocations FlutterMemoryAllocations
An interface for listening to object lifecycle events.
The type of builder function used for building a MenuAcceleratorLabel 's
MenuAcceleratorLabel.builder function.
The type of builder function used by MenuAnchor.builder to build the
widget that the MenuAnchor surrounds.
The signature for a function that generates unique menu item IDs for
serialization of a PlatformMenuItem .
MessageHandler
= Future <ByteData ? ? Function(ByteData ?message
A function which takes a platform message and asynchronously returns an encoded response.
NavigatorFinderCallback
= NavigatorState Function(BuildContext context
A callback that given a BuildContext finds a NavigatorState .
Signature used by NestedScrollView for building its header.
NotificationListenerCallback T extends Notification >
= bool Function(T notification
Signature for Notification listeners.
NullableIndexedWidgetBuilder
= Widget ? Function(BuildContext context , int index
Signature for a function that creates a widget for a given index, e.g., in a
list, but may return null.
ObjectEventListener
= void Function(ObjectEvent event
A listener of ObjectEvent .
OnInvokeCallback T extends Intent >
= Object ? Function(T intent
The signature of a callback accepted by CallbackAction.onInvoke .
OnKeyEventCallback
= KeyEventResult Function(KeyEvent event
Signature of a callback used by FocusManager.addEarlyKeyEventHandler and
FocusManager.addLateKeyEventHandler .
OrientationWidgetBuilder
= Widget Function(BuildContext context , Orientation orientation
Signature for a function that builds a widget given an Orientation .
The signature of WidgetsApp.pageRouteBuilder .
PaintImageCallback
= void Function(ImageSizeInfo info
Called when the framework is about to paint an Image to a Canvas with an
ImageSizeInfo that contains the decoded size of the image as well as its
output size.
PaintRangeValueIndicator
= void Function(PaintingContext context , Offset offset
RangeSlider uses this callback to paint the value indicator on the overlay.
Since the value indicator is painted on the Overlay; this method paints the
value indicator in a RenderBox that appears in the Overlay .
PaintValueIndicator
= void Function(PaintingContext context , Offset offset
Slider uses this callback to paint the value indicator on the overlay.
PlaceholderWidgetBuilder
= Widget Function(BuildContext context , String url
Builder function to create a placeholder widget. The function is called
once while the ImageProvider is loading the image.
PlatformMessageResponseCallback
= void Function(ByteData ?data
Signature for responses to platform messages.
PlatformViewCreatedCallback
= void Function(int id
Callback signature for when a platform view was created.
PlatformViewSurfaceFactory
= Widget Function(BuildContext context , PlatformViewController controller
A factory for a surface presenting a platform view as part of the widget hierarchy.
PointerCancelEventListener
= void Function(PointerCancelEvent event
Signature for listening to PointerCancelEvent events.
PointerDownEventListener
= void Function(PointerDownEvent event
Signature for listening to PointerDownEvent events.
PointerEnterEventListener
= void Function(PointerEnterEvent event
Signature for listening to PointerEnterEvent events.
PointerExitEventListener
= void Function(PointerExitEvent event
Signature for listening to PointerExitEvent events.
PointerHoverEventListener
= void Function(PointerHoverEvent event
Signature for listening to PointerHoverEvent events.
PointerMoveEventListener
= void Function(PointerMoveEvent event
Signature for listening to PointerMoveEvent events.
PointerUpEventListener
= void Function(PointerUpEvent event
Signature for listening to PointerUpEvent events.
PointTransformer
= Offset Function(Offset position
Converts a given point from the global coordinate system in logical pixels
to the local coordinate system for a box.
PopInvokedCallback
= void Function(bool didPop
A callback type for informing that a navigation pop has been invoked,
whether or not it was handled successfully.
PopInvokedWithResultCallback T >
= void Function(bool didPop , T? result
A callback type for informing that a navigation pop has been invoked,
whether or not it was handled successfully.
PopPageCallback
= bool Function(Route route , dynamic result
Signature for the Navigator.onPopPage callback.
PopResultCallback T >
= void Function(T? result
A signature for a function that is passed the result of a Route .
Signature for the callback invoked when a PopupMenuButton is dismissed
without selecting an item.
Signature used by PopupMenuButton to lazily construct the items shown when
the button is pressed.
Signature for the callback invoked when a menu item is selected. The
argument is the value of the PopupMenuItem that caused its menu to be
dismissed.
PrintHandler
= void Function(Zone self , ZoneDelegate parent , Zone zone , String line
The type of a custom Zone.print implementation function.
ProgressIndicatorBuilder
= Widget Function(BuildContext context , String url , DownloadProgress progress
Builder function to create a progress indicator widget. The function is
called every time a chuck of the image is downloaded from the web, but at
least once during image loading.
RangeThumbSelector
= Thumb ? Function(TextDirection textDirection , RangeValues values , double tapValue , Size thumbSize , Size trackSize , double dx
Decides which thumbs (if any) should be selected.
RawKeyEventHandler
= bool Function(RawKeyEvent event
A callback type used by RawKeyboard.keyEventHandler to send key events to
a handler that can determine if the key has been handled or not.
RebuildDirtyWidgetCallback
= void Function(Element e , bool builtOnce
Signature for debugOnRebuildDirtyWidget implementations.
RebuildFactor
= bool Function(MediaQueryData old , MediaQueryData data
RectCallback
= Rect Function()
Signature for the callback used by ink effects to obtain the rectangle for the effect.
RefreshCallback
= Future <void > Function()
The signature for a function that's called when the user has dragged a
RefreshIndicator far enough to demonstrate that they want the app to
refresh. The returned Future must complete when the refresh operation is
finished.
RegisterBinaryCallbackHandler
= ZoneBinaryCallback <R , T1 , T2 > Function<R , T1 , T2 >(Zone self , ZoneDelegate parent , Zone zone , R f (T1 arg1 , T2 arg2
The type of a custom Zone.registerBinaryCallback implementation function.
RegisterCallbackHandler
= ZoneCallback <R > Function<R >(Zone self , ZoneDelegate parent , Zone zone , R f ()
The type of a custom Zone.registerCallback implementation function.
RegisterServiceExtensionCallback
= void Function({required ServiceExtensionCallback callback , required String name
Signature for a method that registers the service extension callback with
the given name.
RegisterUnaryCallbackHandler
= ZoneUnaryCallback <R , T > Function<R , T >(Zone self , ZoneDelegate parent , Zone zone , R f (T arg
The type of a custom Zone.registerUnaryCallback implementation function.
RegisterViewFactory
= void Function(String Object int viewId bool isVisible
Function signature for ui_web.platformViewRegistry.registerViewFactory.
ReorderCallback
= void Function(int oldIndex , int newIndex
A callback used by ReorderableList to report that a list item has moved
to a new position in the list.
ReorderItemProxyDecorator
= Widget Function(Widget child , int index , Animation <double animation
Signature for the builder callback used to decorate the dragging item in
ReorderableList and SliverReorderableList .
RestorableRouteBuilder T >
= Route <T > Function(BuildContext context , Object ?arguments
Creates a Route that is to be added to a Navigator .
RouteCompletionCallback T >
= void Function(T result
A callback to handle the result of a completed Route .
RouteFactory
= Route ? Function(RouteSettings settings
Creates a route for the given route settings.
RouteListFactory
= List <Route Function(NavigatorState navigator , String initialRoute
Creates a series of one or more routes.
RoutePageBuilder
= Widget Function(BuildContext context , Animation <double animation , Animation <double secondaryAnimation
Signature for the function that builds a route's primary contents.
Used in PageRouteBuilder and showGeneralDialog .
RoutePredicate
= bool Function(Route route
Signature for the Navigator.popUntil predicate argument.
RoutePresentationCallback
= String Function(NavigatorState navigator , Object ?arguments
A callback that given some arguments and a navigator adds a new
restorable route to that navigator and returns the opaque ID of that
new route.
RouteTransitionsBuilder
= Widget Function(BuildContext context , Animation <double animation , Animation <double secondaryAnimation , Widget child
Signature for the function that builds a route's transitions.
Used in PageRouteBuilder and showGeneralDialog .
RunBinaryHandler
= R Function<R , T1 , T2 >(Zone self , ZoneDelegate parent , Zone zone , R f (T1 arg1 , T2 arg2 T1 arg1 , T2 arg2
The type of a custom Zone.runBinary implementation function.
RunHandler
= R Function<R >(Zone self , ZoneDelegate parent , Zone zone , R f ()
The type of a custom Zone.run implementation function.
RunUnaryHandler
= R Function<R , T >(Zone self , ZoneDelegate parent , Zone zone , R f (T arg T arg
The type of a custom Zone.runUnary implementation function.
ScheduleMicrotaskHandler
= void Function(Zone self , ZoneDelegate parent , Zone zone , void f ()
The type of a custom Zone.scheduleMicrotask implementation function.
ScreenUtilInitBuilder
= Widget Function(BuildContext context , Widget ?child
ScrollableWidgetBuilder
= Widget Function(BuildContext context , ScrollController scrollController
The signature of a method that provides a BuildContext and
ScrollController for building a widget that may overflow the draggable
Axis of the containing DraggableScrollableSheet .
ScrollControllerCallback
= void Function(ScrollPosition position
Signature for when a ScrollController has added or removed a
ScrollPosition .
ScrollIncrementCalculator
= double Function(ScrollIncrementDetails details
A typedef for a function that can calculate the offset for a type of scroll
increment given a ScrollIncrementDetails .
ScrollNotificationCallback
= void Function(ScrollNotification notification
A ScrollNotification listener for ScrollNotificationObserver .
ScrollNotificationPredicate
= bool Function(ScrollNotification notification
A predicate for ScrollNotification , used to customize widgets that
listen to notifications from their children.
SearchAnchorChildBuilder
= Widget Function(BuildContext context , SearchController controller
Signature for a function that creates a Widget which is used to open a search view.
SearchCallback T >
= int ? Function(List <DropdownMenuEntry <T > entries , String query
A callback function that returns the index of the item that matches the
current contents of a text field.
SelectableDayForRangePredicate
= bool Function(DateTime day , DateTime ?selectedStartDay , DateTime ?selectedEndDay
Signature for predicating enabled dates in date range pickers.
SelectableDayPredicate
= bool Function(DateTime day
Signature for predicating dates for enabled date selections.
Signature for a widget builder that builds a context menu for the given
SelectableRegionState .
SelectionChangedCallback
= void Function(TextSelection selection , SelectionChangedCause ?cause
Signature for the callback that reports when the user changes the selection
(including the cursor location).
SemanticFormatterCallback
= String Function(double value
A callback that formats a numeric value from a Slider or RangeSlider widget.
SemanticIndexCallback
= int ? Function(Widget widget , int localIndex
A callback which produces a semantic index given a widget and the local index.
SemanticsBuilderCallback
= List <CustomPainterSemantics Function(Size size
Signature of the function returned by CustomPainter.semanticsBuilder .
ServiceExtensionCallback
= Future <Map <String dynamic > Function(Map <String String parameters
Signature for service extensions.
ShaderCallback
= Shader Function(Rect bounds
Signature for a function that creates a Shader for a given Rect .
ShaderWarmUpImageCallback
= bool Function(Image image
The signature of debugCaptureShaderWarmUpImage .
ShaderWarmUpPictureCallback
= bool Function(Picture picture
The signature of debugCaptureShaderWarmUpPicture .
SharedAppDataInitCallback T >
= T Function()
The type of the SharedAppData.getValue init parameter.
SliverLayoutWidgetBuilder
= Widget Function(BuildContext context , SliverConstraints constraints
The signature of the SliverLayoutBuilder builder function.
StackTraceDemangler
= StackTrace Function(StackTrace details
Signature for a function that demangles StackTrace objects into a format
that can be parsed by StackFrame .
StatefulWidgetBuilder
= Widget Function(BuildContext context , StateSetter setState
Signature for the builder callback used by StatefulBuilder .
StateSetter
= void Function(VoidCallback fn
The signature of State.setState functions.
StepIconBuilder
= Widget ? Function(int stepIndex , StepState stepState
A builder that creates the icon widget for the Step at stepIndex, given
stepState.
StringConversionSinkBase StringConversionSink
This class provides a base-class for converters that need to accept String
inputs.
StringConversionSinkMixin StringConversionSink
This class provides a mixin for converters that need to accept String
inputs.
SuggestionsBuilder
= FutureOr <Iterable <Widget Function(BuildContext context , SearchController controller
Signature for a function that creates a Widget to build the suggestion list
based on the input in the search bar.
SystemUiChangeCallback
= Future <void > Function(bool systemOverlaysAreVisible
Signature for listening to changes in the SystemUiMode .
TapRegionCallback
= void Function(PointerDownEvent event
The type of callback that TapRegion.onTapOutside and
TapRegion.onTapInside take.
TextInputFormatFunction
= TextEditingValue Function(TextEditingValue oldValue , TextEditingValue newValue
Function signature expected for creating custom TextInputFormatter
shorthands via TextInputFormatter.withFunction .
ToolbarBuilder
= Widget Function(BuildContext context , Widget child
The type for a Function that builds a toolbar's container with the given
child.
TooltipTriggeredCallback
= void Function()
Signature for when a tooltip is triggered.
TransformCallback
= Matrix4 Function(double animationValue
Signature for the callback to MatrixTransition.onTransform .
TransitionBuilder
= Widget Function(BuildContext context , Widget ?child
A builder that builds a widget given a child.
TraversalRequestFocusCallback
= void Function(FocusNode node , {double ?alignment , ScrollPositionAlignmentPolicy ?alignmentPolicy , Curve ?curve , Duration ?duration
Signature for the callback that's called when a traversal policy
requests focus.
TreeSliverNodeBuilder
= Widget Function(BuildContext context , TreeSliverNode <Object ? node , AnimationStyle animationStyle
Signature for a function that creates a Widget to represent the given
TreeSliverNode in the TreeSliver .
TreeSliverNodeCallback
= void Function(TreeSliverNode <Object ? node
Signature for a function that is called when a TreeSliverNode is toggled,
changing its expanded state.
TreeSliverRowExtentBuilder
= double Function(TreeSliverNode <Object ? node , SliverLayoutDimensions dimensions
Signature for a function that returns an extent for the given
TreeSliverNode in the TreeSliver .
TweenConstructor T extends Object >
= Tween <T > Function(T targetValue
Signature for a Tween factory.
TweenVisitor T extends Object >
= Tween <T > ? Function(Tween <T > ?tween , T targetValue , TweenConstructor <T > constructor
Signature for callbacks passed to ImplicitlyAnimatedWidgetState.forEachTween .
TwoDimensionalIndexedWidgetBuilder
= Widget ? Function(BuildContext context , ChildVicinity vicinity
Signature for a function that creates a widget for a given ChildVicinity ,
e.g., in a TwoDimensionalScrollView , but may return null.
TwoDimensionalViewportBuilder
= Widget Function(BuildContext context , ViewportOffset verticalPosition , ViewportOffset horizontalPosition
Signature used by TwoDimensionalScrollable to build the viewport through
which the scrollable content is displayed.
UntilPredicate
= bool Function(int offset , bool forward
Signature for a predicate that takes an offset into a UTF-16 string, and a
boolean that indicates the search direction.
ValueChanged T >
= void Function(T value
Signature for callbacks that report that an underlying value has changed.
ValueGetter T >
= T Function()
Signature for callbacks that are to report a value on demand.
ValueListenableTransformer T >
= T Function(T
Signature for method used to transform values in Animation.fromValueListenable .
ValueSetter T >
= void Function(T value
Signature for callbacks that report that a value has been set.
ValueWidgetBuilder T >
= Widget Function(BuildContext context , T value , Widget ?child
Builds a Widget when given a concrete value of a ValueListenable<T> .
ViewBuilder
= Widget Function(Iterable <Widget suggestions
Signature for a function that creates a Widget to layout the suggestion list.
ViewportBuilder
= Widget Function(BuildContext context , ViewportOffset position
Signature used by Scrollable to build the viewport through which the
scrollable content is displayed.
VoidCallback
= void Function()
Signature of callbacks that have no arguments and return no data.
WidgetBuilder
= Widget Function(BuildContext context
Signature for a function that creates a widget, e.g. StatelessWidget.build
or State.build .
WidgetPropertyResolver T >
= T Function(Set <WidgetState states
Signature for the function that returns a value of type T based on a given
set of states.
WidgetStateMap T >
= Map <WidgetStatesConstraint T >
A Map used to resolve to a single value of type T based on
the current set of Widget states.
WillPopCallback
= Future <bool Function()
Signature for a callback that verifies that it's OK to call Navigator.pop .
ZoneBinaryCallback R , T1 , T2 >
= R Function(T1 , T2
ZoneCallback R >
= R Function()
ZoneUnaryCallback R , T >
= R Function(T
