CustomPainterSemantics class
Contains properties describing information drawn in a rectangle contained by the Canvas used by a CustomPaint.
This information is used, for example, by assistive technologies to improve the accessibility of applications.
Implement CustomPainter.semanticsBuilder to build the semantic description of the whole picture drawn by a CustomPaint, rather than one particular rectangle.
See also:
- SemanticsNode, which is created using the properties of this class.
- CustomPainter, which creates instances of this class.
- Annotations
Constructors
-
CustomPainterSemantics({Key? key, required Rect rect, required SemanticsProperties properties, Matrix4? transform, Set<
SemanticsTag> ? tags}) -
Creates semantics information describing a rectangle on a canvas.
const
Properties
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Identifies this object in a list of siblings.
final
- properties → SemanticsProperties
-
Contains properties that are assigned to the SemanticsNode created or
updated from this object.
final
- rect → Rect
-
The location and size of the box on the canvas where this piece of semantic
information applies.
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
-
Tags used by the parent SemanticsNode to determine the layout of the
semantics tree.
final
- transform → Matrix4?
-
The transform from the canvas' coordinate system to its parent's
coordinate system.
final
Methods
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited