CanvasTransformProvider class

Provides access to the canvas transformation matrix for descendant widgets.

This allows widgets deep in the tree (like PortWidget) to access the current canvas zoom level without explicitly passing it through constructors.

Example:

// Access the scale from any descendant widget
final scale = CanvasTransformProvider.of(context)?.scale ?? 1.0;
Inheritance
Available extensions

Constructors

CanvasTransformProvider({Key? key, required Matrix4 transform, required Widget child})
const

Properties

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
scale → double
Gets the current canvas scale (zoom level) from the transform matrix.
no setter
transform → Matrix4
final

Methods

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 CanvasTransformProvider oldWidget) → bool
Whether the framework should notify widgets that inherit from this widget.
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

Static Methods

of(BuildContext context) → CanvasTransformProvider?
Retrieves the nearest CanvasTransformProvider ancestor from the widget tree.