AnimatedSliverMultiBoxAdaptorElement class

An element that lazily builds children for a SliverWithKeepAliveWidget.

Implements RenderSliverBoxChildManager, which lets this element manage the children of subclasses of RenderSliverMultiBoxAdaptor.

This class takes the implementation of the standard SliverMultiBoxAdaptorElement class and adds support for animations and reordering feature.

Inheritance

• Object
• DiagnosticableTree
• Element
• RenderObjectElement
• AnimatedSliverMultiBoxAdaptorElement

Implemented types

• MultiRenderSliverBoxChildManager
• BuildContext

Constructors

AnimatedSliverMultiBoxAdaptorElement(AnimatedSliverMultiBoxAdaptorWidget widget)

Creates an element that lazily builds children for the given widget with support for animations and reordering.

Properties

childCount → int

no setter, override

debugDoingBuild → bool

Whether the widget is currently updating the widget or render tree.

no setter, inherited

debugIsActive → bool

Returns true if the Element is active.

no setter, inherited

debugIsDefunct → bool

Returns true if the Element is defunct.

no setter, inherited

delegate → AnimatedSliverChildDelegate

no setter

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 setter, inherited

dirty → bool

Returns true if the element has been marked as needing rebuilding.

no setter, inherited

hashCode → int

The hash code for this object.

no setter, inherited

isHorizontal → bool

no setter

listOfPopUps → List<_PopUpList>

no setter, override

managedPopUpLists → Iterable<_PopUpList>

no setter

mounted → bool

Whether the Widget this context is associated with is currently mounted in the widget tree.

no setter, inherited

owner → BuildOwner?

The object that manages the lifecycle of this element.

no setter, inherited

renderObject → AnimatedRenderSliverMultiBoxAdaptor

The underlying RenderObject for this element.

no setter, override

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 setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

size → Size?

The size of the RenderBox returned by findRenderObject.

no setter, inherited

slot → Object?

Information set by parent to define where this child fits in its parent's child list.

no setter, inherited

widget → AnimatedSliverMultiBoxAdaptorWidget

The configuration for this element.

no setter, override

Methods

activate() → void

Transition from the "inactive" to the "active" lifecycle state.

inherited

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

batch(VoidCallback callback) → void

See AnimatedListController.batch.

build(int index, {bool measureOnly = false, _PopUpList? popUpList}) → Widget?

buildIndexFromContext(BuildContext context) → _Slot?

computeItemBox(int index, bool absolute) → Rect?

See AnimatedListController.computeItemBox.

createChild(_PopUpList? popUpList, int index, {required RenderBox? after}) → void

Copied from SliverMultiBoxAdaptorElement.createChild.

override

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

debugAssertChildListLocked() → bool

Copied from SliverMultiBoxAdaptorElement.debugAssertChildListLocked.

override

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

Copied from SliverMultiBoxAdaptorElement.debugVisitOnstageChildren.

override

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

didAdoptChild(RenderBox child) → void

Copied from SliverMultiBoxAdaptorElement.didAdoptChild. An assertion has been removed to allow adoption of off-list elements.

override

didChangeDependencies() → void

Called when a dependency of this element changes.

override

didFinishLayout(_PopUpList? popUpList) → void

Copied from SliverMultiBoxAdaptorElement.didFinishLayout.

override

didStartLayout(_PopUpList? popUpList) → void

Copied from SliverMultiBoxAdaptorElement.didStartLayout.

override

dispatchNotification(Notification notification) → void

Start bubbling this notification at the given build context.

inherited

disposableElement(Widget widget, void callback(RenderBox)) → void

It creates an disposable off-list element built with the specified widget, and executes the callback. Eventually, the child is disposed.

doesDependOnInheritedElement(InheritedElement ancestor) → bool

Returns true if dependOnInheritedElement was previously called with ancestor.

inherited

estimateLayoutOffset(int buildIndex, int childCount, {double? time, _MovingPopUpList? popUpList}) → _Measure

estimateMaxScrollOffset(SliverConstraints constraints, {int? firstIndex, int? lastIndex, double? leadingScrollOffset, double? trailingScrollOffset}) → double

Copied from SliverMultiBoxAdaptorElement.estimateMaxScrollOffset. The SliverMultiBoxAdaptorWidget.estimateMaxScrollOffset method call has been removed just now.

override

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

forgetChild(Element child) → void

Copied from SliverMultiBoxAdaptorElement.forgetChild.

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

getItemSizesFromSliverList(int buildFrom, int buildTo) → _SizeResult?

getItemVisibleSize(int index) → _PercentageSize?

See AnimatedListController.getItemVisibleSize.

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 _Slot? slot) → void

Copied from SliverMultiBoxAdaptorElement.insertRenderObjectChild. This method has been changed to prevent inserting off-list elements into the children list.

override

markNeedsBuild() → void

Marks the element as dirty and adds it to the global list of widgets to rebuild in the next frame.

inherited

markNeedsLayout() → void

measureItem(Widget widget) → double

Measures the size of the widget.

measureItems(_Cancelled? cancelled, int count, IndexedWidgetBuilder builder, [double startingSize = 0, int startingCount = 0]) → Future<_Measure>

Measures the size of a bunch of off-list children up to count elements. You have to provide a builder to build the i-th widget. The calculation is asynchronous and can be cancelled.

mount(Element? parent, dynamic newSlot) → void

This method has been overridden to give the render object the didChangeDependencies method and to link this list view to its controller.

override

moveRenderObjectChild(covariant RenderObject child, covariant _Slot? oldSlot, covariant _Slot? newSlot) → void

Copied from SliverMultiBoxAdaptorElement.moveRenderObjectChild. This method has been changed to prevent assertion errors.

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

notifyChangedRange(int from, int count, AnimatedWidgetBuilder changedItemBuilder) → void

See AnimatedListController.notifyChangedRange.

notifyInsertedRange(int from, int count) → void

See AnimatedListController.notifyInsertedRange.

notifyMovedRange(int from, int count, int newIndex) → void

See AnimatedListController.notifyMovedRange.

notifyRemovedRange(int from, int count, AnimatedWidgetBuilder removedItemBuilder) → void

See AnimatedListController.notifyRemovedRange.

notifyReplacedRange(int from, int removeCount, int insertCount, AnimatedWidgetBuilder removedItemBuilder) → void

See AnimatedListController.notifyReplacedRange.

notifyStartReorder(BuildContext context, double dx, double dy) → bool

See AnimatedListController.notifyStartReorder.

notifyStopReorder(bool cancel) → void

See AnimatedListController.notifyStopReorder.

notifyUpdateReorder(double dx, double dy) → void

See AnimatedListController.notifyUpdateReorder.

oldIndexToNewIndex(int? index, _PopUpList? popUpList) → _ReindexResult

This function takes the old index of a child and calculates the new one by considering all the pending updates. This method can return null if the child no longer exists (for example, all elements of a remove interval disappear when it becomes a resizing interval).

performRebuild() → void

Inspired by SliverMultiBoxAdaptorElement.performRebuild.

override

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

removeChild(_PopUpList? popUpList, RenderBox child) → void

Copied from SliverMultiBoxAdaptorElement.removeChild.

override

removeRenderObjectChild(covariant RenderObject child, covariant _Slot? slot) → void

Copied from SliverMultiBoxAdaptorElement.removeRenderObjectChild. This method has been changed to prevent the removal of unlisted children (eg off-list elements).

override

renderBoxAt(int buildIndex) → RenderBox?

reorderCancel() → void

resizingIntervalUpdated(_AnimatedSpaceInterval interval, double delta) → void

Notifies that the resizing interval has changed its size by the delta amount.

setDidUnderflow(bool value) → void

Copied from SliverMultiBoxAdaptorElement.setDidUnderflow. The didUnderflow variabile is no longer needed.

override

test() → void

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}) → 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

unmount() → void

This method has been overridden to give the render object a dispose method and to unlink this list view from its controller.

override

update(covariant AnimatedSliverMultiBoxAdaptorWidget newWidget) → void

Change the widget used to configure this element.

override

updateChild(Element? child, Widget? newWidget, dynamic newSlot) → Element?

Copied from SliverMultiBoxAdaptorElement.updateChild.

override

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

Copied from SliverMultiBoxAdaptorElement.visitChildren. This method has been changed to include pop-up elements.

override

wrapWidget(AnimatedWidgetBuilder builder, int index, AnimatedWidgetBuilderData data, [bool map = true]) → Widget

Operators

operator ==(Object other) → bool

Compare two widgets for equality.

inherited