UnboundedStack class

A Stack that allows hit testing on children positioned outside its bounds.

Flutter's default Stack blocks hit testing for children outside its bounds, even when clipBehavior is Clip.none. This custom Stack overrides hitTest to allow gestures on overflow content.

This is essential for infinite canvas implementations where nodes and other elements can be positioned at arbitrary coordinates that may be outside the Stack's layout bounds after pan/zoom transformations.

Example usage:

UnboundedStack(
  clipBehavior: Clip.none,
  children: [
    Positioned(
      left: 5000, // Far outside typical bounds
      top: 5000,
      child: GestureDetector(
        onTap: () => print('Tap works!'),
        child: Container(...),
      ),
    ),
  ],
)

Inheritance

• Object
• DiagnosticableTree
• Widget
• RenderObjectWidget
• MultiChildRenderObjectWidget
• Stack
• UnboundedStack

Available extensions

• AnnotationLayerSupport

Constructors

UnboundedStack({Key? key, AlignmentGeometry alignment = AlignmentDirectional.topStart, TextDirection? textDirection, StackFit fit = StackFit.loose, Clip clipBehavior = Clip.hardEdge, List<Widget> children = const <Widget>[]})

const

Properties

alignment → AlignmentGeometry

How to align the non-positioned and partially-positioned children in the stack.

final, inherited

children → List<Widget>

The widgets below this widget in the tree.

final, inherited

clipBehavior → Clip

The content will be clipped (or not) according to this option.

final, inherited

fit → StackFit

How to size the non-positioned children in the stack.

final, inherited

hashCode → int

The hash code for this object.

no setter, 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.

no setter, inherited

textDirection → TextDirection?

The text direction with which to resolve alignment.

final, inherited

Methods

createElement() → MultiChildRenderObjectElement

RenderObjectWidgets always inflate to a RenderObjectElement subclass.

inherited

createRenderObject(BuildContext context) → RenderStack

Creates an instance of the RenderObject class that this RenderObjectWidget represents, using the configuration described by this RenderObjectWidget.

override

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

didUnmountRenderObject(covariant RenderObject renderObject) → void

This method is called when a RenderObject that was previously associated with this widget is removed from the render tree. The provided RenderObject will be of the same type as the one created by this widget's createRenderObject method.

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

updateRenderObject(BuildContext context, covariant RenderStack renderObject) → void

Copies the configuration described by this RenderObjectWidget to the given RenderObject, which will be of the same type as returned by this object's createRenderObject.

override

withAnnotationLayer(NodeFlowController<T> controller) → Widget

Available on Widget, provided by the AnnotationLayerSupport extension

Wraps this widget with an annotation layer.

Operators

operator ==(Object other) → bool

The equality operator.

inherited