ShaderMaskLayer class
A composited layer that applies a shader to its children.
The shader is only applied inside the given maskRect. The shader itself uses the top left of the maskRect as its origin.
The maskRect does not affect the positions of any child layers.
- Inheritance
-
- Object
- Layer
- ContainerLayer
- ShaderMaskLayer
Constructors
- ShaderMaskLayer({Shader? shader, Rect? maskRect, BlendMode? blendMode})
- Creates a shader mask layer.
Properties
- alwaysNeedsAddToScene → bool
-
Subclasses may override this to true to disable retained rendering.
no setterinherited
- attached → bool
-
Whether the layer tree containing this layer is attached to an owner.
no setterinherited
- blendMode ↔ BlendMode?
-
The blend mode to apply when blending the shader with the children.
getter/setter pair
- debugCreator ↔ Object?
-
The object responsible for creating this layer.
getter/setter pairinherited
- debugDisposed → bool
-
If asserts are enabled, returns whether dispose has
been called since the last time any retained resources were created.
no setterinherited
- debugHandleCount → int
-
Returns the number of objects holding a LayerHandle to this layer.
no setterinherited
- debugSubtreeNeedsAddToScene → bool?
-
Whether this or any descendant layer in the subtree needs addToScene.
no setterinherited
- depth → int
-
The depth of this layer in the layer tree.
no setterinherited
- engineLayer ↔ EngineLayer?
-
Stores the engine layer created for this layer in order to reuse engine
resources across frames for better app performance.
getter/setter pairinherited
- firstChild → Layer?
-
The first composited layer in this layer's child list.
no setterinherited
- hasChildren → bool
-
Returns whether this layer has at least one child layer.
no setterinherited
- hashCode → int
-
The hash code for this object.
no setterinherited
- lastChild → Layer?
-
The last composited layer in this layer's child list.
no setterinherited
- maskRect ↔ Rect?
-
The position and size of the shader.
getter/setter pair
- nextSibling → Layer?
-
This layer's next sibling in the parent layer's child list.
no setterinherited
- owner → Object?
-
The owner for this layer (null if unattached).
no setterinherited
- parent → ContainerLayer?
-
This layer's parent in the layer tree.
no setterinherited
- previousSibling → Layer?
-
This layer's previous sibling in the parent layer's child list.
no setterinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- shader ↔ Shader?
-
The shader to apply to the children.
getter/setter pair
- subtreeHasCompositionCallbacks → bool
-
Whether the subtree rooted at this layer has any composition callback
observers.
no setterinherited
Methods
-
addChildrenToScene(
SceneBuilder builder) → void -
Uploads all of this layer's children to the engine.
inherited
-
addCompositionCallback(
CompositionCallback callback) → VoidCallback -
Adds a callback for when the layer tree that this layer is part of gets
composited, or when it is detached and will not be rendered again.
inherited
-
addToScene(
SceneBuilder builder) → void -
Override this method to upload this layer to the engine.
override
-
append(
Layer child) → void -
Adds the given layer to the end of this layer's child list.
inherited
-
applyTransform(
Layer? child, Matrix4 transform) → void -
Applies the transform that would be applied when compositing the given
child to the given matrix.
inherited
-
attach(
covariant Object owner) → void -
Mark this layer as attached to the given owner.
inherited
-
buildScene(
SceneBuilder builder) → Scene -
Consider this layer as the root and build a scene (a tree of layers)
in the engine.
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.
override
-
debugMarkClean(
) → void -
Mark that this layer is in sync with engine.
inherited
-
depthFirstIterateChildren(
) → List< Layer> -
Returns the descendants of this layer in depth first order.
inherited
-
describeClipBounds(
) → Rect? -
Describes the clip that would be applied to contents of this layer,
if any.
inherited
-
detach(
) → void -
Mark this layer as detached from its owner.
inherited
-
dispose(
) → void -
Clears any retained resources that this layer holds.
inherited
-
find<
S extends Object> (Offset localPosition) → S? -
Search this layer and its subtree for the first annotation of type
S
under the point described bylocalPosition
.inherited -
findAllAnnotations<
S extends Object> (Offset localPosition) → AnnotationResult< S> -
Search this layer and its subtree for all annotations of type
S
under the point described bylocalPosition
.inherited -
findAnnotations<
S extends Object> (AnnotationResult< S> result, Offset localPosition, {required bool onlyFirst}) → bool -
Search this layer and its subtree for annotations of type
S
at the location described bylocalPosition
.inherited -
markNeedsAddToScene(
) → void -
Mark that this layer has changed and addToScene needs to be called.
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
redepthChild(
Layer child) → void -
Adjust the depth of the given
child
to be greater than this node's own depth.inherited -
redepthChildren(
) → void -
Adjust the depth of this node's children, if any.
inherited
-
remove(
) → void -
Removes this layer from its parent layer's child list.
inherited
-
removeAllChildren(
) → void -
Removes all of this layer's children from its child list.
inherited
-
supportsRasterization(
) → bool -
Whether or not this layer, or any child layers, can be rasterized with
Scene.toImage or Scene.toImageSync.
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 brief description of this object, usually just the runtimeType and the
hashCode.
inherited
-
updateSubtreeNeedsAddToScene(
) → void -
Traverses the layer subtree starting from this layer and determines whether it needs addToScene.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited