ShaderMask class

A widget that applies a mask generated by a Shader to its child.

For example, ShaderMask can be used to gradually fade out the edge of a child by using a RadialGradient mask.

This example makes the text look like it is on fire:
link 
ShaderMask(
  shaderCallback: (Rect bounds) {
    return RadialGradient(
      center: Alignment.topLeft,
      radius: 1.0,
      colors: <Color>[Colors.yellow, Colors.deepOrange.shade900],
      tileMode: TileMode.mirror,
    ).createShader(bounds);
  },
  child: const Text(
    "I'm burning the memories",
    style: TextStyle(color: Colors.white),
  ),
)

See also:

  • Opacity, which can apply a uniform alpha effect to its child.
  • CustomPaint, which lets you draw directly on the canvas.
  • DecoratedBox, for another approach at decorating child widgets.
  • BackdropFilter, which applies an image filter to the background.
Inheritance

Constructors

ShaderMask.new({Key? key, required ShaderCallback shaderCallback, BlendMode blendMode = BlendMode.modulate, Widget? child})
Creates a widget that applies a mask generated by a Shader to its child.
const

Properties

blendMode → BlendMode
The BlendMode to use when applying the shader to the child.
final
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
shaderCallback → ShaderCallback
Called to create the dart:ui.Shader that generates the mask.
final

Methods

createElement() → SingleChildRenderObjectElement
RenderObjectWidgets always inflate to a RenderObjectElement subclass.
inherited
createRenderObject(BuildContext context) → RenderShaderMask
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 RenderShaderMask 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

Operators

operator ==(Object other) → bool
The equality operator.
inherited