BuildContext class abstract

A handle to the location of a widget in the widget tree.

Implementers

Constructors

BuildContext()

Properties

appTargetId → String
App's target id.
no setter
hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Associated widget's key.
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
widget → Widget
The configuration for this render element.
no setter
widgetRuntimeType → String
Widget's runtime type.
no setter

Methods

dependOnInheritedWidgetOfExactType<T extends InheritedWidget>() → T?
Obtains the nearest widget of the given type T, which must be the type of a concrete InheritedWidget subclass, and registers this build context with that widget such that when that widget changes (or a new widget of that type is introduced, or the widget goes away), this build context is rebuilt so that it can obtain new values from that widget.
findAncestorRenderElementOfExactType<T extends RenderElement>() → T?
Returns the nearest ancestor render element of the given type T, which must be the type of a concrete RenderElement subclass.
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.
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.
findClosestDomNode() → Element
Returns dom node that's associated with the current context.
findClosestDomNodeInAncestors() → Element?
Returns the nearest dom node in ancestors.
findClosestDomNodeInDescendants() → Element?
Returns the nearest dom node in descendants.
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.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
setMetaInformation({required String informationId, required MetaInformation information}) → void
Add or update document meta information.
toString() → String
A string representation of this object.
inherited
traverseAncestorElements(RenderElementCallback callback) → void
Traverse the ancestor elements.
traverseChildElements(RenderElementCallback callback) → void
Traverse the child elements of this render element.
unsetMetaInformation({required String informationId}) → void
Clear meta information associated with meta information id.
visitAncestorElements(RenderElementVisitor visitor) → void
Walks the ancestor chain, starting with the parent of this build context's widget, invoking the argument for each ancestor. The callback is given a reference to the ancestor widget's corresponding Element object. The walk stops when it reaches the root widget or when the callback returns false.
visitChildElements(RenderElementVisitor visitor) → void
Walks the children of this render element. The callback is given a reference to the child widget's corresponding Element object. The walk stops when it reaches the end of child or when the callback returns false.

Operators

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