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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| extensions: |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,107 @@ | ||
| import 'dart:math'; | ||
| import 'package:flutter/material.dart'; | ||
|
|
||
| /// A custom StatefulWidget that creates an animated wave progress bar. | ||
| /// | ||
| /// The [WaveProgressBar] takes a progress value and an optional gradient to | ||
| /// display an animated wave indicating the current progress. | ||
| class WaveProgressBar extends StatefulWidget { | ||
| /// The current progress value. Expected to be between 0.0 and 1.0. | ||
| final double progress; | ||
|
|
||
| /// An optional gradient to color the wave. Defaults to null, which uses a solid blue color. | ||
| final Gradient? gradient; | ||
|
|
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| /// Creates an instance of [WaveProgressBar]. | ||
| /// | ||
| /// Requires a [progress] value and optionally takes a [gradient]. | ||
| const WaveProgressBar({Key? key, required this.progress, this.gradient}) | ||
| : super(key: key); | ||
|
|
||
| @override | ||
| _WaveProgressBarState createState() => _WaveProgressBarState(); | ||
| } | ||
|
|
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| /// The state class for [WaveProgressBar] which manages the animation controller. | ||
| class _WaveProgressBarState extends State<WaveProgressBar> | ||
| with SingleTickerProviderStateMixin { | ||
| /// The animation controller for the wave animation. | ||
| AnimationController? _controller; | ||
|
|
||
| @override | ||
| void initState() { | ||
| super.initState(); | ||
| _controller = | ||
| AnimationController(vsync: this, duration: const Duration(seconds: 2)) | ||
| ..addListener(() => setState(() {})) | ||
| ..repeat(); | ||
| } | ||
|
|
||
| @override | ||
| void dispose() { | ||
| _controller?.dispose(); | ||
| super.dispose(); | ||
| } | ||
|
|
||
| @override | ||
| Widget build(BuildContext context) { | ||
|
|
||
| return CustomPaint( | ||
| painter: WavePainter( | ||
| progress: widget.progress, | ||
| animationValue: _controller!.value, | ||
| gradient: widget.gradient), | ||
| child: Container(), | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| /// A custom painter class to draw the wave based on the progress and animation values. | ||
| class WavePainter extends CustomPainter { | ||
| /// The current progress value. | ||
| final double progress; | ||
|
|
||
| /// The current value of the animation, used to animate the wave. | ||
| final double animationValue; | ||
|
|
||
| /// An optional gradient used to color the wave. | ||
| final Gradient? gradient; | ||
|
|
||
| /// Creates an instance of [WavePainter] with the given [progress], [animationValue], and [gradient]. | ||
| WavePainter( | ||
| {required this.progress, required this.animationValue, this.gradient}); | ||
|
|
||
| @override | ||
| void paint(Canvas canvas, Size size) { | ||
| final paint = Paint(); | ||
| if (gradient != null) { | ||
| Rect rect = Rect.fromLTWH(0, 0, size.width, size.height); | ||
| paint.shader = gradient!.createShader(rect); | ||
| } else { | ||
| paint.color = Colors.blue; | ||
| } | ||
|
|
||
| final path = Path(); | ||
| for (double i = 0.0; i < size.width; i++) { | ||
| double waveHeight = | ||
| sin((i / size.width * 2 * pi) + (2 * pi * animationValue)) * 20; | ||
| double y = (1 - progress) * size.height + waveHeight; | ||
| if (i == 0) { | ||
| path.moveTo(i, y); | ||
| } else { | ||
| path.lineTo(i, y); | ||
| } | ||
| } | ||
|
|
||
| path.lineTo(size.width, size.height); | ||
| path.lineTo(0, size.height); | ||
| path.close(); | ||
|
|
||
| canvas.drawPath(path, paint); | ||
| } | ||
|
|
||
| @override | ||
| bool shouldRepaint(covariant CustomPainter oldDelegate) { | ||
| return oldDelegate != this; | ||
| } | ||
| } |
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