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import 'package:flutter/material.dart';
class AnimationsWidget extends StatefulWidget {
const AnimationsWidget({super.key});
@override
AnimationsWidgetState createState() => AnimationsWidgetState();
}
class AnimationsWidgetState extends State<AnimationsWidget>
with TickerProviderStateMixin {
late AnimationController _controller;
late AnimationController _customController;
late Animation<double> _animation;
late Animation<double> _customAnimation;
bool _isVisible = false;
bool _isLarge = false;
@override
void initState() {
super.initState();
_controller = AnimationController(
vsync: this, // 必须传入一个TickerProvider，通常为当前State对象
duration: const Duration(seconds: 2), // 设置动画持续时间
);
_animation = Tween(begin: 0.0, end: 1.0).animate(_controller);
// // 添加动画状态监听，可以在动画状态改变时执行自定义逻辑
_controller.addStatusListener((status) {
if (status == AnimationStatus.completed) {
_controller.reverse(); // 当动画完成时，反向播放动画
} else if (status == AnimationStatus.dismissed) {
_controller.forward(); // 当动画回到初始状态时，正向播放动画
}
});
_customController = AnimationController(
duration: const Duration(seconds: 2),
vsync: this,
)..repeat(reverse: true);
_customAnimation =
Tween<double>(begin: 0, end: 100).animate(_customController)
..addListener(() {
setState(() {});
});
}
@override
void dispose() {
_controller.dispose();
_customController.dispose(); // 在组件销毁时释放AnimationController
super.dispose();
}
@override
Widget build(BuildContext context) {
return SingleChildScrollView(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
ElevatedButton(
onPressed: () {
showExplicitAnimations();
},
child: const Text('显式动画')),
const SizedBox(
height: 20,
),
// AnimatedOpacity(
// opacity: _visible ? 1.0 : 0.0,
// duration: const Duration(seconds: 1),
// child: Container(
// width: 200,
// height: _visible? 100 : 0,
// color: Colors.blue,
// ),
// ),
AnimatedContainer(
duration: const Duration(seconds: 1),
curve: Curves.fastOutSlowIn,
width: _isVisible ? 300.0 : 200.0,
height: _isVisible ? 50.0 : 200.0,
color: _isVisible ? Colors.blue : Colors.red,
child: const Center(
child: Text(
'切换颜色和大小',
style: TextStyle(color: Colors.white),
),
),
),
ElevatedButton(
onPressed: () {
showImplicitAnimations();
},
child: const Text('隐式动画')),
const SizedBox(
height: 20,
),
AnimatedPhysicalModel(
duration: const Duration(milliseconds: 500),
shape: BoxShape.rectangle,
elevation: _isLarge ? 20 : 0,
color: _isLarge ? Colors.blue : Colors.purple,
shadowColor: Colors.black,
borderRadius:
_isLarge ? BorderRadius.circular(20) : BorderRadius.circular(0),
child: const SizedBox(
width: 200,
height: 80,
child: Center(
child: Text(
'切换大小',
style: TextStyle(color: Colors.white),
),
),
),
),
ElevatedButton(
onPressed: () {
showPhysicsBasedAnimation();
},
child: const Text(' 物理动画')),
const SizedBox(
height: 20,
),
CustomPaint(
painter: MyCustomPainter(_customAnimation.value),
child: const SizedBox(
width: 200,
height: 200,
),
),
ElevatedButton(
onPressed: () {
showCustomAnimations();
},
child: const Text('自定义动画')),
],
));
}
void showExplicitAnimations() {
showDialog(
context: context,
builder: (context) {
return Center(
child: AnimatedBuilder(
animation: _animation,
builder: (context, child) {
return Transform.scale(
scale: _animation.value,
child: AlertDialog(
title: const Text('Animated Dialog'),
content: const Text('This is an animated dialog.'),
actions: [
TextButton(
onPressed: () {
Navigator.of(context).pop();
},
child: const Text('Close'),
),
],
),
);
},
),
);
},
);
_controller.reset();
_controller.forward();
}
void showImplicitAnimations() {
setState(() {
_isVisible = !_isVisible;
});
}
void showPhysicsBasedAnimation() {
setState(() {
_isLarge = !_isLarge;
});
}
void showCustomAnimations() {
_customController.reset();
_customController.forward();
}
}
class MyCustomPainter extends CustomPainter {
final double radius;
MyCustomPainter(this.radius);
@override
void paint(Canvas canvas, Size size) {
debugPrint('size:$size, radius:$radius');
final paint = Paint();
paint.color = Colors.green;
paint.style = PaintingStyle.fill;
canvas.drawCircle(Offset(size.width / 2, size.height / 2), radius, paint);
}
@override
bool shouldRepaint(covariant CustomPainter oldDelegate) {
return true;
}
}
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