UnboundedPositioned class

A Positioned widget that allows hit testing on its child outside its bounds.

Use this inside an UnboundedStack for layer widgets that need to receive hit tests for positions outside the layer's layout bounds.

This is essential for infinite canvas implementations where:

• The layer fills the visible viewport (e.g., 800x600)
• Content within the layer can be at arbitrary canvas coordinates (e.g., 5000, 5000)
• Hit tests need to reach content regardless of position

Example usage:

UnboundedStack(
  clipBehavior: Clip.none,
  children: [
    UnboundedPositioned.fill(
      child: NodesContainer(...), // Contains nodes at arbitrary positions
    ),
  ],
)

Inheritance

• Object
• DiagnosticableTree
• Widget
• StatelessWidget
• UnboundedPositioned

Available extensions

• AnnotationLayerSupport

Constructors

UnboundedPositioned({Key? key, double? left, double? top, double? right, double? bottom, double? width, double? height, required Widget child})

const

UnboundedPositioned.fill({Key? key, required Widget child})

Creates a Positioned that fills its parent while allowing unbounded hit testing.

const

Properties

bottom → double?

final

child → Widget

final

hashCode → int

The hash code for this object.

no setter, inherited

height → double?

final

key → Key?

Controls how one widget replaces another widget in the tree.

final, inherited

left → double?

final

right → double?

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

top → double?

final

width → double?

final

Methods

build(BuildContext context) → Widget

Describes the part of the user interface represented by this widget.

override

createElement() → StatelessElement

Creates a StatelessElement to manage this widget's location in the tree.

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

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