IntersectionObserverLayer class

Inheritance

Constructors

IntersectionObserverLayer({required Size elementSize, required Offset paintOffset, required IntersectionChangeCallback onIntersectionChange})

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
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
elementSize ← Size
no getter
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
id ↔ int
getter/setter pair
lastChild → Layer?
The last composited layer in this layer's child list.
no setterinherited
nextSibling → Layer?
This layer's next sibling in the parent layer's child list.
no setterinherited
onIntersectionChange → IntersectionChangeCallback
final
owner → Object?
The owner for this layer (null if unattached).
no setterinherited
paintOffset ← Offset
no getter
parent → ContainerLayer?
This layer's parent in the layer tree.
no setterinherited
previousLayerHash ↔ int
getter/setter pair
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
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, [Offset layerOffset = Offset.zero]) → void
See Layer.addToScene.
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
See AbstractNode.attach.
override
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
See Diagnosticable.debugFillProperties.
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
See AbstractNode.detach.
override
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 by localPosition.
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 by localPosition.
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 by localPosition.
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