ShaderMask class Null safety

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 ui.Gradient.linear mask.

link
This example makes the text look like it is on fire: 
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'),
)

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({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.
nonVirtual">@nonVirtualread-onlyinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited
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.
protected">@protectedinherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
inherited
didUnmountRenderObject(covariant RenderObject renderObject) → void
A render object previously associated with this widget has been removed from the tree. The given RenderObject will be of the same type as returned by this object's createRenderObject.
protected">@protectedinherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent 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}) → 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.
nonVirtual">@nonVirtualinherited