DraggableScrollableActuator class Null safety

A widget that can notify a descendent DraggableScrollableSheet that it should reset its position to the initial state.

The Scaffold uses this widget to notify a persistent bottom sheet that the user has tapped back if the sheet has started to cover more of the body than when at its initial position. This is important for users of assistive technology, where dragging may be difficult to communicate.

This is just a wrapper on top of DraggableScrollableController. It is primarily useful for controlling a sheet in a part of the widget tree that the current code does not control (e.g. library code trying to affect a sheet in library users' code). Generally, it's easier to control the sheet directly by creating a controller and passing the controller to the sheet in its constructor (see DraggableScrollableSheet.controller).



DraggableScrollableActuator({Key? key, required Widget child})
Creates a widget that can notify descendent DraggableScrollableSheets to reset to their initial position.


child Widget
This child's DraggableScrollableSheet descendant will be reset when the reset method is applied to a context that includes it.
hashCode int
The hash code for this object.
@nonVirtual, read-only, inherited
key Key?
Controls how one widget replaces another widget in the tree.
final, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited


build(BuildContext context) Widget
Describes the part of the user interface represented by this widget.
createElement() StatelessElement
Creates a StatelessElement to manage this widget's location in the tree.
debugDescribeChildren() List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) String
A string representation of this object.
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) String
Returns a string representation of this node and its descendants.
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) String
Returns a one-line detailed description of the object.
toStringShort() String
A short, textual description of this widget.


operator ==(Object other) bool
The equality operator.
@nonVirtual, inherited

Static Methods

reset(BuildContext context) bool
Notifies any descendant DraggableScrollableSheet that it should reset to its initial position.