SliverPinnedPersistentHeaderElement class

Inheritance
Available extensions

Properties

accessibleNavigation → bool

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

accessibleNavigation → bool 用户是否使用TalkBack或VoiceOver等辅助功能服务与应用程序进行交互。
no setter
boldText → bool

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

alwaysUse24HourFormat → bool 格式化时间时是否使用24小时格式。
no setter
bottomNavigationBarHeight → double

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

获取导航栏高度
no setter
buildScope → BuildScope
A BuildScope whose dirty Elements can only be rebuilt by BuildOwner.buildScope calls whose context argument is an Element within this BuildScope.
no setterinherited
canRequestFocus → bool

Available on BuildContext, provided by the ExtensionFocusScopeContext extension

no setter
child ↔ Element?
getter/setter pair
debugDoingBuild → bool
Whether the widget is currently updating the widget or render tree.
no setterinherited
debugIsActive → bool
Returns true if the Element is active.
no setterinherited
debugIsDefunct → bool
Returns true if the Element is defunct.
no setterinherited
depth → int
An integer that is guaranteed to be greater than the parent's, if any. The element at the root of the tree must have a depth greater than 0.
no setterinherited
deviceHeight → double

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

手机屏幕高
no setter
devicePixelRatio → double

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

devicePixelRatio → double 单位逻辑像素的设备像素数量，即设备像素比。这个数字可能不是2的幂，实际上它甚至也可能不是整数。例如，Nexus 6的设备像素比为3.5。
no setter
deviceSize → Size

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

size → Size 设备尺寸信息，如屏幕的大小，单位 pixels
no setter
deviceWidth → double

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

手机屏幕的宽
no setter
dirty → bool
Returns true if the element has been marked as needing rebuilding.
no setterinherited
disableAnimations → bool

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

disableAnimations → bool 平台是否要求尽可能禁用或减少使用动画。
no setter
focusScope → FocusScopeNode

Available on BuildContext, provided by the ExtensionFocusScopeContext extension

FocusScope
no setter
getRenderBox → RenderBox?

Available on BuildContext, provided by the ExtensionContext extension

no setter
getWidgetBounds → Rect

Available on BuildContext, provided by the ExtensionContext extension

get Widget Bounds (width, height, left, top, right, bottom and so on).Widgets must be rendered completely. 获取widget Rect
no setter
hasFocus → bool

Available on BuildContext, provided by the ExtensionFocusScopeContext extension

no setter
hashCode → int
The hash code for this object.
no setterinherited
hasPrimaryFocus → bool

Available on BuildContext, provided by the ExtensionFocusScopeContext extension

no setter
height → double

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

The same of MediaQuery.of(context).size.height Note: updates when you rezise your screen (like on a browser or desktop window)
no setter
heightPixel → double

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

手机屏幕高分辨率
no setter
iconButtonTheme → IconButtonThemeData

Available on BuildContext, provided by the ExtensionContext extension

no setter
iconColor → Color?

Available on BuildContext, provided by the ExtensionContext extension

give access to Theme.of(context).iconTheme.color
no setter
iconTheme → IconThemeData

Available on BuildContext, provided by the ExtensionContext extension

no setter
invertColors → bool

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

invertColors → bool 设备是否反转平台的颜色
no setter
isDarkMode → bool

Available on BuildContext, provided by the ExtensionContext extension

Check if dark mode theme is enable
no setter
isFirstFocus → bool

Available on BuildContext, provided by the ExtensionFocusScopeContext extension

no setter
isLandscape → bool

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

check if device is on landscape mode
no setter
isLargeTablet → bool

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

True if the shortestSide is largest than 720p
no setter
isPhone → bool

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

True if the shortestSide is smaller than 600p
no setter
isPortrait → bool

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

check if device is on portrait mode
no setter
isSmallTablet → bool

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

True if the shortestSide is largest than 600p
no setter
isTablet → bool

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

True if the current device is Tablet
no setter
maybeOverlay → OverlayState?

Available on BuildContext, provided by the ExtensionContext extension

no setter
maybeView → FlutterView?

Available on BuildContext, provided by the ExtensionContext extension

Returns the FlutterView that the provided context will render into.
no setter
mediaQuery → MediaQueryData

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

similar to MediaQuery.of(context).padding
no setter
mediaQueryShortestSide → double

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

get the shortestSide from screen
no setter
mediaQuerySize → Size

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

The same of MediaQuery.of(context).size
no setter
mounted → bool
Whether the Widget this context is associated with is currently mounted in the widget tree.
no setterinherited

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

NavigatorState
no setter
nearestScope → FocusScopeNode

Available on BuildContext, provided by the ExtensionFocusScopeContext extension

no setter
orientation → Orientation

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

orientation → Orientation 屏幕方向（横向/纵向）
no setter
overlay → OverlayState?

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

overlay
no setter
overlay → OverlayState?

Available on BuildContext, provided by the ExtensionContext extension

no setter
owner → BuildOwner?
The object that manages the lifecycle of this element.
no setterinherited
padding → EdgeInsets

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

padding → EdgeInsets 显示器的部分被系统UI部分遮挡，通常由硬件显示“凹槽”或系统状态栏
no setter
parent → FocusNode?

Available on BuildContext, provided by the ExtensionFocusScopeContext extension

no setter
platformBrightness → Brightness

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

platformBrightness → Brightness 当前的亮度模式
no setter
renderObject → RenderSliverPinnedPersistentHeader
The underlying RenderObject for this element.
no setteroverride
renderObjectAttachingChild → Element?
Returns the child of this Element that will insert a RenderObject into an ancestor of this Element to construct the render tree.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
showNavBar → bool

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

True if width be larger than 800
no setter
size → Size?
The size of the RenderBox returned by findRenderObject.
no setterinherited
slot → Object?
Information set by parent to define where this child fits in its parent's child list.
no setterinherited
statusBarHeight → double

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

获取状态栏高度
no setter
tabBarTheme → TabBarTheme

Available on BuildContext, provided by the ExtensionContext extension

no setter
textScaleFactor → double

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

textScaleFactor → double 每个逻辑像素的字体像素数
no setter
textTheme → TextTheme

Available on BuildContext, provided by the ExtensionContext extension

similar to MediaQuery.of(context).padding
no setter
theme → ThemeData

Available on BuildContext, provided by the ExtensionContext extension

similar to MediaQuery.of(context).padding
no setter
userGestureInProgress → bool

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

userGestureInProgress
no setter
view → FlutterView

Available on BuildContext, provided by the ExtensionContext extension

Returns the FlutterView that the provided context will render into.
no setter
viewInsets → EdgeInsets

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

viewInsets → EdgeInsets 显示器的各个部分完全被系统UI遮挡，通常是设备的键盘
no setter
viewPadding → EdgeInsets

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

viewPadding → EdgeInsets 显示器的部分被系统UI部分遮挡，通常由硬件显示“凹槽”或系统状态栏
no setter
widget → SliverPinnedPersistentHeaderRenderObjectWidget
The configuration for this element.
no setteroverride
width → double

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

The same of MediaQuery.of(context).size.width Note: updates when you rezise your screen (like on a browser or desktop window)
no setter
widthPixel → double

Available on BuildContext, provided by the ExtensionContextWithMediaQuery extension

手机屏幕的宽分辨率
no setter

Methods

activate() → void
Transition from the "inactive" to the "active" lifecycle state.
inherited
addListener(VoidCallback listener) → void

Available on BuildContext, provided by the ExtensionFocusScopeContext extension

attach(BuildContext? context, {FocusOnKeyEventCallback? onKeyEvent, FocusOnKeyCallback? onKey}) → FocusAttachment

Available on BuildContext, provided by the ExtensionFocusScopeContext extension

attachNotificationTree() → void
Called in Element.mount and Element.activate to register this element in the notification tree.
inherited
attachRenderObject(Object? newSlot) → void
Add renderObject to the render tree at the location specified by newSlot.
inherited
autofocus([FocusNode? focusNode]) → void

Available on BuildContext, provided by the ExtensionFocusScopeContext extension

自动获取焦点
build(double shrinkOffset, double? minExtent, double maxExtent, bool overlapsContent) → void
canPop() → bool

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

canPop
deactivate() → void
Transition from the "active" to the "inactive" lifecycle state.
inherited
deactivateChild(Element child) → void
Move the given element to the list of inactive elements and detach its render object from the render tree.
inherited
debugDeactivated() → void
Called, in debug mode, after children have been deactivated (see deactivate).
inherited
debugDescribeChildren() → List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
inherited
debugExpectsRenderObjectForSlot(Object? slot) → bool
Whether the child in the provided slot (or one of its descendants) must insert a RenderObject into its ancestor RenderObjectElement by calling RenderObjectElement.insertRenderObjectChild on it.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
inherited
debugGetCreatorChain(int limit) → String
Returns a description of what caused this element to be created.
inherited
debugGetDiagnosticChain() → List<Element>
Returns the parent chain from this element back to the root of the tree.
inherited
debugVisitOnstageChildren(ElementVisitor visitor) → void
Calls the argument for each child considered onstage.
inherited
dependOnInheritedElement(InheritedElement ancestor, {Object? aspect}) → InheritedWidget
Registers this build context with ancestor such that when ancestor's widget changes this build context is rebuilt.
inherited
dependOnInheritedWidgetOfExactType<T extends InheritedWidget>({Object? aspect}) → T?
Returns the nearest widget of the given type T and creates a dependency on it, or null if no appropriate widget is found.
inherited
describeElement(String name, {DiagnosticsTreeStyle style = DiagnosticsTreeStyle.errorProperty}) → DiagnosticsNode
Returns a description of the Element associated with the current build context.
inherited
describeMissingAncestor({required Type expectedAncestorType}) → List<DiagnosticsNode>
Adds a description of a specific type of widget missing from the current build context's ancestry tree.
inherited
describeOwnershipChain(String name) → DiagnosticsNode
Adds a description of the ownership chain from a specific Element to the error report.
inherited
describeWidget(String name, {DiagnosticsTreeStyle style = DiagnosticsTreeStyle.errorProperty}) → DiagnosticsNode
Returns a description of the Widget associated with the current build context.
inherited
detachRenderObject() → void
Remove renderObject from the render tree.
inherited
didChangeDependencies() → void
Called when a dependency of this element changes.
inherited
dispatchNotification(Notification notification) → void
Start bubbling this notification at the given build context.
inherited
doesDependOnInheritedElement(InheritedElement ancestor) → bool
Returns true if dependOnInheritedElement was previously called with ancestor.
inherited
findAncestorRenderObjectOfType<T extends RenderObject>() → T?
Returns the RenderObject object of the nearest ancestor RenderObjectWidget widget that is an instance of the given type T.
inherited
findAncestorStateOfType<T extends State<StatefulWidget>>() → T?
Returns the State object of the nearest ancestor StatefulWidget widget that is an instance of the given type T.
inherited
findAncestorWidgetOfExactType<T extends Widget>() → T?
Returns the nearest ancestor widget of the given type T, which must be the type of a concrete Widget subclass.
inherited
findRenderObject() → RenderObject?
The current RenderObject for the widget. If the widget is a RenderObjectWidget, this is the render object that the widget created for itself. Otherwise, it is the render object of the first descendant RenderObjectWidget.
inherited
findRootAncestorStateOfType<T extends State<StatefulWidget>>() → T?
Returns the State object of the furthest ancestor StatefulWidget widget that is an instance of the given type T.
inherited
focusInDirection(TraversalDirection direction) → bool

Available on BuildContext, provided by the ExtensionFocusScopeContext extension

forgetChild(Element child) → void
Remove the given child from the element's child list, in preparation for the child being reused elsewhere in the element tree.
override
getElementForInheritedWidgetOfExactType<T extends InheritedWidget>() → InheritedElement?
Obtains the element corresponding to the nearest widget of the given type T, which must be the type of a concrete InheritedWidget subclass.
inherited
getInheritedWidgetOfExactType<T extends InheritedWidget>() → T?
Returns the nearest widget of the given InheritedWidget subclass T or null if an appropriate ancestor is not found.
inherited
getWidgetGlobalToLocal({Offset point = Offset.zero, RenderObject? ancestor}) → Offset

Available on BuildContext, provided by the ExtensionContext extension

Get the coordinates of the widget on the screen.Widgets must be rendered completely. 获取widget在屏幕上的坐标,widget必须渲染完成
getWidgetLocalToGlobal({Offset point = Offset.zero, RenderObject? ancestor}) → Offset

Available on BuildContext, provided by the ExtensionContext extension

Get the coordinates of the widget on the screen.Widgets must be rendered completely. 获取widget在屏幕上的坐标,widget必须渲染完成
getWidgetRectGlobalToLocal({Offset point = Offset.zero, RenderObject? ancestor}) → Rect?

Available on BuildContext, provided by the ExtensionContext extension

Get the Rect of the widget on the screen.Widgets must be rendered completely. 获取widget在屏幕上的Rect,widget必须渲染完成
getWidgetRectLocalToGlobal({Offset point = Offset.zero, RenderObject? ancestor}) → Rect?

Available on BuildContext, provided by the ExtensionContext extension

Get the Rect of the widget on the screen.Widgets must be rendered completely. 获取widget在屏幕上的Rect,widget必须渲染完成
heightTransformer({double dividedBy = 1, double reducedBy = 0.0}) → double

Available on BuildContext, provided by the ExtensionContext extension

Gives you the power to get a portion of the height. Useful for responsive applications.
inflateWidget(Widget newWidget, Object? newSlot) → Element
Create an element for the given widget and add it as a child of this element in the given slot.
inherited
insertRenderObjectChild(covariant RenderObject child, covariant dynamic slot) → void
Insert the given child into renderObject at the given slot.
override
markNeedsBuild() → void
Marks the element as dirty and adds it to the global list of widgets to rebuild in the next frame.
inherited
maybePop<T extends Object?>([T? result]) → Future<bool>

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

maybePop
mount(Element? parent, dynamic newSlot) → void
Add this element to the tree in the given slot of the given parent.
override
moveRenderObjectChild(covariant RenderObject child, covariant dynamic oldSlot, covariant dynamic newSlot) → void
Move the given child from the given old slot to the given new slot.
override
nextFocus() → bool

Available on BuildContext, provided by the ExtensionFocusScopeContext extension

noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
performRebuild() → void
Cause the widget to update itself.
override
pop<T extends Object?>([T? result]) → void

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

pop
popAndPushNamed<T extends Object?, TO extends Object?>(String routeName, {TO? result, Object? arguments}) → Future<T?>

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

popAndPushNamed
popUntil(RoutePredicate predicate) → void

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

popUntil
previousFocus() → bool

Available on BuildContext, provided by the ExtensionFocusScopeContext extension

push<T extends Object?>(Route<T> route) → Future<T?>

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

push
pushAndRemoveUntil<T extends Object?>(Route<T> newRoute, RoutePredicate predicate) → Future<T?>

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

pushAndRemoveUntil
pushNamed<T extends Object?>(String routeName, {Object? arguments}) → Future<T?>

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

pushNamed
pushNamedAndRemoveUntil<T extends Object?>(String newRouteName, RoutePredicate predicate, {Object? arguments}) → Future<T?>

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

pushNamedAndRemoveUntil
pushReplacement<T extends Object?, TO extends Object?>(Route<T> newRoute, {TO? result}) → Future<T?>

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

pushReplacement
pushReplacementNamed<T extends Object?, TO extends Object?>(String routeName, {TO? result, Object? arguments}) → Future<T?>

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

pushReplacementNamed
ratio({double dividedBy = 1, double reducedByW = 0.0, double reducedByH = 0.0}) → double

Available on BuildContext, provided by the ExtensionContext extension

Divide the height proportionally by the given value
reassemble() → void
Called whenever the application is reassembled during debugging, for example during hot reload.
inherited
rebuild({bool force = false}) → void
Cause the widget to update itself. In debug builds, also verify various invariants.
inherited
removeListener(VoidCallback listener) → void

Available on BuildContext, provided by the ExtensionFocusScopeContext extension

removeRenderObjectChild(covariant RenderObject child, covariant dynamic slot) → void
Remove the given child from renderObject.
override
removeRoute(Route route) → void

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

removeRoute
removeRouteBelow(Route route) → void

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

removeRouteBelow
requestFocus([FocusNode? focusNode]) → void

Available on BuildContext, provided by the ExtensionFocusScopeContext extension

focusNode==null 移出焦点 （可用于关闭键盘） focusNode！!= null 获取焦点
restorablePopAndPushNamed<T extends Object?, TO extends Object?>(String routeName, {TO? result, Object? arguments}) → String

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

restorablePopAndPushNamed
restorablePush<T extends Object?>(RestorableRouteBuilder<T> routeBuilder, {Object? arguments}) → String

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

restorablePush
restorablePushNamed<T extends Object?>(String routeName, {Object? arguments}) → String

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

restorablePushNamed
restorablePushNamedAndRemoveUntil<T extends Object?>(String newRouteName, RoutePredicate predicate, {Object? arguments}) → String

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

restorablePushNamedAndRemoveUntil
restorablePushReplacement<T extends Object?, TO extends Object?>(RestorableRouteBuilder<T> routeBuilder, {TO? result, Object? arguments}) → String

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

restorablePushReplacement
restorablePushReplacementNamed<T extends Object?, TO extends Object?>(String routeName, {TO? result, Object? arguments}) → String

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

restorablePushReplacementNamed
restorableReplace<T extends Object?>({required Route oldRoute, required RestorableRouteBuilder<T> newRouteBuilder, Object? arguments}) → String

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

restorableReplace
restorableReplaceRouteBelow<T extends Object?>({required Route anchorRoute, required RestorableRouteBuilder<T> newRouteBuilder, Object? arguments}) → String

Available on BuildContext, provided by the ExtensionNavigatorStateContext extension

restorableReplaceRouteBelow
setFirstFocus(FocusScopeNode scope) → void

Available on BuildContext, provided by the ExtensionFocusScopeContext extension

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 element.
inherited
unfocus({UnfocusDisposition disposition = UnfocusDisposition.scope}) → void

Available on BuildContext, provided by the ExtensionFocusScopeContext extension

unmount() → void
Transition from the "inactive" to the "defunct" lifecycle state.
override
update(covariant SliverPinnedPersistentHeaderRenderObjectWidget newWidget) → void
Change the widget used to configure this element.
override
updateChild(Element? child, Widget? newWidget, Object? newSlot) → Element?
Update the given child with the given new configuration.
inherited
updateChildren(List<Element> oldChildren, List<Widget> newWidgets, {Set<Element>? forgottenChildren, List<Object?>? slots}) → List<Element>
Updates the children of this element to use new widgets.
inherited
updateSlot(Object? newSlot) → void
Called by updateSlotForChild when the framework needs to change the slot that this Element occupies in its ancestor.
inherited
updateSlotForChild(Element child, Object? newSlot) → void
Change the slot that the given child occupies in its parent.
inherited
visitAncestorElements(ConditionalElementVisitor visitor) → void
Walks the ancestor chain, starting with the parent of this build context's widget, invoking the argument for each ancestor.
inherited
visitChildElements(ElementVisitor visitor) → void
Wrapper around visitChildren for BuildContext.
inherited
visitChildren(ElementVisitor visitor) → void
Calls the argument for each child. Must be overridden by subclasses that support having children.
override
widthTransformer({double dividedBy = 1, double reducedBy = 0.0}) → double

Available on BuildContext, provided by the ExtensionContext extension

Gives you the power to get a portion of the width. Useful for responsive applications.

Operators

operator ==(Object other) → bool
Compare two widgets for equality.
inherited