CellHookContext class abstract

Interface providing methods for defining cells and watch functions that are persisted between builds of a widget.

Inheritance

Properties

debugDoingBuild → bool
Whether the widget is currently updating the widget or render tree.
no setterinherited
hashCode → int
The hash code for this object.
no setterinherited
mounted → bool
Whether the Widget this context is associated with is currently mounted in the widget tree.
no setterinherited
owner → BuildOwner?
The BuildOwner for this context. The BuildOwner is in charge of managing the rendering pipeline for this context.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
size → Size?
The size of the RenderBox returned by findRenderObject.
no setterinherited
widget → Widget
The current configuration of the Element that is this BuildContext.
no setterinherited

Methods

cell<T, V extends ValueCell<T>>(CreateCell<V> create) → V
Return an instance of a ValueCell that is kept between builds of the widget.
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
dispatchNotification(Notification notification) → void
Start bubbling this notification at the given build context.
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
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
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() → String
A string representation of this object.
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
Walks the children of this widget.
inherited
watch(VoidCallback watch) → void
Register a callback function to be called whenever the values of cells change.

Operators

operator ==(Object other) → bool
The equality operator.
inherited