DragBoundary class

Provides a DragBoundaryDelegate for its descendants whose bounds are those defined by this widget.

forRectOf and forRectMaybeOf returns a delegate for a drag object of type Rect.

This example demonstrates dragging a red box, constrained within the bounds of a green box.

To create a local project with this code sample, run:
flutter create --sample=widgets.DragBoundary.1 mysample

Inheritance

Constructors

DragBoundary({required Widget child, Key? key}): Creates a widget that provides a boundary to its descendants.
const

child → Widget: The widget below this widget in the tree.
finalinherited
hashCode → int: The hash code for this object.
no setterinherited
key → Key?: Controls how one widget replaces another widget in the tree.
finalinherited
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited

createElement() → InheritedElement: Inflates this configuration to a concrete instance.
inherited
debugDescribeChildren() → List<DiagnosticsNode>: Returns a list of DiagnosticsNode objects describing this node's children.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void: Add additional properties associated with the node.
inherited
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
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 widget.
inherited
updateShouldNotify(covariant InheritedWidget oldWidget) → bool: Whether the framework should notify widgets that inherit from this widget.
override

forRectMaybeOf(BuildContext context, {bool useGlobalPosition = true}) → DragBoundaryDelegate<Rect>?: Retrieve the DragBoundary from the nearest ancestor to get its DragBoundaryDelegate of Rect.
forRectOf(BuildContext context, {bool useGlobalPosition = true}) → DragBoundaryDelegate<Rect>: Retrieve the DragBoundary from the nearest ancestor to get its DragBoundaryDelegate of Rect.