DropdownButton2<T> class
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- DropdownButton2
Constructors
-
DropdownButton2({Key? key, required List<
DropdownMenuItem< ? items, DropdownButtonBuilder? selectedItemBuilder, T? value, Widget? hint, Widget? disabledHint, ValueChanged<T> >T?> ? onChanged, int dropdownElevation = 8, TextStyle? style, Widget? underline, Widget? icon, Widget? iconOnClick, Color? iconDisabledColor, Color? iconEnabledColor, double iconSize = 24.0, bool isDense = false, bool isExpanded = false, double itemHeight = kMinInteractiveDimension, Color? focusColor, FocusNode? focusNode, bool autofocus = false, double? dropdownMaxHeight, bool? enableFeedback, AlignmentGeometry alignment = AlignmentDirectional.centerStart, double? buttonHeight, double? buttonWidth, EdgeInsetsGeometry? buttonPadding, BoxDecoration? buttonDecoration, int? buttonElevation, EdgeInsetsGeometry? itemPadding, double? dropdownWidth, EdgeInsetsGeometry? dropdownPadding, BoxDecoration? dropdownDecoration, Color? selectedItemHighlightColor, Radius? scrollbarRadius, double? scrollbarThickness, bool? scrollbarAlwaysShow, Offset? offset, Widget? customButton, List<int> ? customItemsIndexes, double? customItemsHeight, bool openWithLongPress = false, bool dropdownOverButton = false, bool dropdownFullScreen = false, void onMenuStateChange(bool isOpen)?})
Properties
- alignment → AlignmentGeometry
-
Defines how the hint or the selected item is positioned within the button.
final
- autofocus → bool
-
True if this widget will be selected as the initial focus when no other
node in its scope is currently focused.
final
-
The decoration of the Button
final
-
The elevation of the Button
final
-
The height of the button.
final
-
The inner padding of the Button
final
-
The width of the button
final
- customButton → Widget?
-
Uses custom widget like icon,image,etc.. instead of the default button
final
- customItemsHeight → double?
-
The height of the items you passed their indexes using customItemsIndexes parameter
final
-
customItemsIndexes
→ List<
int> ? -
Indexes of the items you want to give different height (useful for adding dividers)
final
- disabledHint → Widget?
-
A preferred placeholder widget that is displayed when the dropdown is disabled.
final
- dropdownDecoration → BoxDecoration?
-
The decoration of the dropdown menu
final
- dropdownElevation → int
-
The z-coordinate at which to place the menu when open.
final
- dropdownFullScreen → bool
-
Opens the dropdown menu in fullscreen mode (Above AppBar & TabBar)
final
- dropdownMaxHeight → double?
-
The maximum height of the menu.
final
- dropdownOverButton → bool
-
Opens the dropdown menu over the button instead of below it
final
- dropdownPadding → EdgeInsetsGeometry?
-
The inner padding of the dropdown menu
final
- dropdownWidth → double?
-
The width of the dropdown menu
final
- enableFeedback → bool?
-
Whether detected gestures should provide acoustic and/or haptic feedback.
final
- focusColor → Color?
-
The color for the button's Material when it has the input focus.
final
- focusNode → FocusNode?
-
An optional focus node to use as the focus node for this widget.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- hint → Widget?
-
A placeholder widget that is displayed by the dropdown button.
final
- icon → Widget?
-
The widget to use for the drop-down button's icon.
final
- iconDisabledColor → Color?
-
The color of any Icon descendant of icon if this button is disabled,
i.e. if onChanged is null.
final
- iconEnabledColor → Color?
-
The color of any Icon descendant of icon if this button is enabled,
i.e. if onChanged is defined.
final
- iconOnClick → Widget?
-
Shows different icon when dropdown menu open
final
- iconSize → double
-
The size to use for the drop-down button's icon.
final
- isDense → bool
-
Reduce the button's height.
final
- isExpanded → bool
-
Set the dropdown's inner contents to horizontally fill its parent.
final
- itemHeight → double
-
If null, then the menu item heights will vary according to each menu item's
intrinsic height.
final
- itemPadding → EdgeInsetsGeometry?
-
The padding of menu items
final
-
items
→ List<
DropdownMenuItem< ?T> > -
The list of items the user can select.
final
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- offset → Offset?
-
Changes the position of the dropdown menu
final
-
onChanged
→ ValueChanged<
T?> ? -
Called when the user selects an item.
final
- onMenuStateChange → void Function(bool isOpen)?
-
Called when the dropdown menu is opened or closed.
final
- openWithLongPress → bool
-
Opens the dropdown menu on long-pressing instead of tapping
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- scrollbarAlwaysShow → bool?
-
Always show the scrollbar even when a scroll is not underway
final
- scrollbarRadius → Radius?
-
The radius of the scrollbar's corners
final
- scrollbarThickness → double?
-
The thickness of the scrollbar
final
- selectedItemBuilder → DropdownButtonBuilder?
-
A builder to customize the dropdown buttons corresponding to the
DropdownMenuItems in items.
final
- selectedItemHighlightColor → Color?
-
The highlight color of the current selected item
final
- style → TextStyle?
-
The text style to use for text in the dropdown button and the dropdown
menu that appears when you tap the button.
final
- underline → Widget?
-
The widget to use for drawing the drop-down button's underline.
final
- value → T?
-
The value of the currently selected DropdownMenuItem.
final
Methods
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree.
inherited
-
createState(
) → State< DropdownButton2< T> > -
Creates the mutable state for this widget at a given location in the tree.
override
-
debugDescribeChildren(
) → List< DiagnosticsNode> -
Returns a list of DiagnosticsNode objects describing this node's
children.
inherited
-
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node.
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
toDiagnosticsNode(
{String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode -
Returns a debug representation of the object that is used by debugging
tools and by DiagnosticsNode.toStringDeep.
inherited
-
toString(
{DiagnosticLevel minLevel = DiagnosticLevel.info}) → String -
A string representation of this object.
inherited
-
toStringDeep(
{String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, int wrapWidth = 65}) → String -
Returns a string representation of this node and its descendants.
inherited
-
toStringShallow(
{String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String -
Returns a one-line detailed description of the object.
inherited
-
toStringShort(
) → String -
A short, textual description of this widget.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited