分階段

Phased

Simplified state management focused on animations

Installation 💻

❗ In order to start using Phased you must have the Flutter SDK installed on your machine.

Add phased to your pubspec.yaml:

dependencies:
  phased:

Install it:

flutter packages get

Description

Phased is a simple state management meant to be used to build animations, its objective is to provide an easy, boilerplateless way to create and manage the state of an animation, so developers can focus on building the animations themselves.

The package consists of two classes: PhasedState, which describes the state and offers control methods for an animation, and Phased, an abstract Widget that will build the animation itself.

Example

To build a simple animation that blinks a child using opacity, the following code can be used:

class BlinkState extends PhasedState<bool> {
  BlinkState() : super(values: [true, false]);
}

class Blink extends Phased<bool> {
  const Blink({
    super.key,
    required super.state,
    required this.child,
  });

  final Widget child;

  @override
  Widget build(BuildContext context) {
    return AnimatedOpacity(
      opacity: state.phaseValue(
        values: const {true: 1},
        defaultValue: 0,
      ),
      onEnd: state.next,
      duration: const Duration(milliseconds: 250),
      child: child,
    );
  }
}

Then to use it:

Blink(
  state: BlinkState(),
  child: Container(
    width: 100,
    height: 100,
    color: Colors.blue,
  ),
);

For more complex examples, check the example folder.

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