AnimatedWidgetBaseState<T extends ImplicitlyAnimatedWidget> class abstract

Base state class for ImplicitlyAnimatedWidget.

Subclasses must override forEachTween to register tweens for each animatable property, and build to use the current tween values.

class _AnimatedOpacityState
    extends AnimatedWidgetBaseState<AnimatedOpacity> {
  Tween<double>? _opacity;

  @override
  void forEachTween(TweenVisitor visitor) {
    _opacity = visitor(
      _opacity,
      widget.opacity,
      (value) => Tween<double>(begin: value as double, end: value),
    ) as Tween<double>?;
  }

  @override
  Widget build(BuildContext context) {
    return Opacity(
      opacity: _opacity?.evaluate(controller) ?? widget.opacity,
      child: widget.child,
    );
  }
}
Inheritance
Mixed-in types

Constructors

AnimatedWidgetBaseState()

Properties

context ↔ BuildContext
The build context for this state.
getter/setter pairinherited
controller → AnimationController
The animation controller driving the implicit animation.
no setter
hashCode → int
The hash code for this object.
no setterinherited
mounted → bool
Whether this state is currently mounted in the element tree.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
widget ↔ T
The current configuration for this state.
getter/setter pairinherited

Methods

build(BuildContext context) → Widget
Builds the widget subtree for this state.
inherited
createAnimationController({double? value, Duration? duration, Duration? reverseDuration, double lowerBound = 0.0, double upperBound = 1.0, int fps = 30, Object? id}) → AnimationController
Creates and registers an AnimationController.
inherited
didUpdateWidget(covariant T oldWidget) → Cmd?
Called when the widget configuration changes.
override
dispose() → void
Disposes all registered controllers and clears the list.
inherited
forEachTween(TweenVisitor visitor) → void
Called to register tweens for each animatable property.
handleInit() → Cmd?
Called once when the widget tree is first mounted.
inherited
handleIntercept(Msg msg) → Cmd?
Called before children during message dispatch.
inherited
handleUpdate(Msg msg) → Cmd?
Intercepts AnimationTickMsg and dispatches it to the matching controller via AnimationController.processTick.
inherited
initState() → void
Called when the state is inserted into the tree.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
registerAnimationController(AnimationController controller) → void
Registers an externally-created controller for tick dispatch and automatic disposal.
inherited
setState(void fn()) → void
Notifies the framework that this state's internal data has changed.
inherited
toString() → String
A string representation of this object.
inherited
unregisterAnimationController(AnimationController controller) → bool
Unregisters a controller so it no longer receives tick dispatch and is no longer automatically disposed.
inherited

Operators

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