ColorOpacityEffect class

An effect that animates a Paint's opacity by mutating its alpha.

Every variant is the same line - base + span * progress - so the constructors differ only in what they put in those two fields. A null _base means the alpha is read when the effect builds rather than being fixed up front.

Inheritance
Available extensions

Constructors

ColorOpacityEffect.by({required Paint paint, required double opacity, required EffectController controller, bool? cleanup, bool? enabled})
Shifts paint's opacity by opacity, relative to its alpha when this effect starts.
ColorOpacityEffect.fadeIn({required Paint paint, required EffectController controller, bool? cleanup, bool? enabled})
Fades paint in from fully transparent to fully opaque.
ColorOpacityEffect.fadeOut({required Paint paint, required EffectController controller, bool? cleanup, bool? enabled})
Fades paint out from fully opaque to fully transparent.

Properties

ancestors → Iterable<Node>
This node's ancestors in the tree.
no setterinherited
children → Iterable<Node>
This node's direct children.
no setterinherited
cleanup ↔ bool
Whether to detach once finished. Defaults to false.
getter/setter pairinherited
controller → EffectController
Drives this effect.
finalinherited
descendants → Iterable<Node>
This node's descendants in depth-first preorder.
no setterinherited
enabled ↔ bool
Whether this node updates and renders. Defaults to true.
getter/setter pairinherited
hashCode → int
The hash code for this object.
no setterinherited
hasParent → bool
True if this node has a non-null parent.
no setterinherited
isFinished → bool
Whether this effect has finished and no longer needs updating.
no setterinherited
isForward → bool
Whether this effect is running in the forward direction.
no setterinherited
isMounted → bool
True while this node is part of a mounted tree.
no setterinherited
isReverse → bool
Whether this effect is running in the reverse direction.
no setterinherited
isRunning → bool
Whether this effect has started progressing.
no setterinherited
onFinish → Signal0
Emitted once, when this effect finishes progressing.
finalinherited
onMax → Signal0
Emitted each time progress reaches 1.
finalinherited
onMin → Signal0
Emitted each time progress reaches 0.
finalinherited
onMount → Signal0
Emitted when this node is added to a scene.
finalinherited
onProgress → Signal1<double>
Emitted after each update once this effect starts progressing, with its current progress.
finalinherited
onSceneResize → Signal1<Vector2>
Emitted when the scene resizes, and once at mount.
finalinherited
onStart → Signal0
Emitted once, when this effect starts progressing.
finalinherited
onUnmount → Signal0
Emitted when this node is removed from a scene.
finalinherited
paint → Paint
The paint whose alpha channel is mutated as this effect progresses.
final
parent → Node?
The parent that owns this node, or null when it is parentless.
no setterinherited
previousProgress → double
This effect's progress as of the previous onProgress emission.
no setterinherited
priority ↔ int
This node's order in updating and rendering in its parent. Defaults to 0.
getter/setter pairinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
scene → Scene<Node>
This node's owning scene. Only valid while isMounted.
no setterinherited

Methods

add<T extends Node>(T node) → T
Adds node to this node. The node is returned.
inherited
addAll(Iterable<Node> nodes) → void
Adds all nodes to this node.
inherited
attach(Node node) → void
Adds this node to the target node.
inherited
build() → void
Declares this node's children and behavior.
override
contains(Node other) → bool
Checks if this node contains the other node in its tree.
inherited
containsPoint(Vector2 point) → bool
Whether this node's hit area contains point.
inherited
cycles(Node node) → bool
True if node is (or soon will be) an ancestor of this node.
inherited
debugDraw(DebugDraw draw) → void
Draws to the debug overlay every frame, in the same space as draw.
inherited
debugRender(Canvas canvas) → void
Renders the debug overlay for this node and its children to canvas.
inherited
debugRenderSelf(Canvas canvas) → void
Runs this node's debugDraw callbacks, in the same space as renderSelf.
inherited
detach() → bool
Removes this node from its parent, or from the parent it is on its way to.
inherited
disable() → void
Disables this node, so it stops updating and rendering.
inherited
draw(Draw draw) → void
Draws to canvas every frame, in this node's own coordinate space.
inherited
enable() → void
Enables this node, so it resumes updating and rendering.
inherited
forward() → void
Run this effect in its forward direction.
inherited
hitTest(Vector2 point) → Iterable<Node>
Finds every enabled node in this subtree whose hit area contains point, per containsPoint, topmost first.
inherited
mount() → Scene<T>

Available on T, provided by the Mount extension

Mounts this node as the root of a new Scene and returns it.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
owns(Node other) → bool
Checks if this node owns the other node.
inherited
provide<T>(T value) → void
Provides value as this node's instance of T, overwriting any value previously provided for T.
inherited
query<T extends Node>() → Iterable<T>
This node's direct children of type T, in priority order.
inherited
read<T>() → T
Reads the nearest instance of T provided by this node or an ancestor, checking this node first.
inherited
readOrNull<T>() → T?
Reads the nearest instance of T provided by this node or an ancestor, checking this node first. Returns null if none was provided.
inherited
reassemble() → void
What this node does when the tree is reassembled.
inherited
rebuild() → void
Re-derives this node by running build again over the wreckage of the last one.
inherited
remove(Node node) → bool
Removes the child node.
inherited
removeAll() → void
Removes all children.
inherited
render(Canvas canvas) → void
Renders this node and its children to canvas.
inherited
renderSelf(Canvas canvas) → void
Runs this node's draw callbacks.
inherited
reset() → void
Resets this effect back to its start.
inherited
reverse() → void
Run this effect in its reverse direction.
inherited
tick(Tick tick) → void
Calls tick with the elapsed seconds on every frame.
inherited
toString() → String
A string representation of this object.
inherited
trash(Cleanup cleanup) → void
Defers cleanup until this build stops being current.
inherited
update(double dt) → void
Updates this node and its children by dt seconds.
inherited

Operators

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