Flutter-实现抽屉动画

在Flutter中，实现抽屉动画可以使用Drawer组件和AnimationController。以下是一个简单的例子：

import 'package:flutter/material.dart';
 
void main() => runApp(MyApp());
 
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MyHomePage(),
    );
  }
}
 
class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}
 
class _MyHomePageState extends State<MyHomePage> with TickerProviderStateMixin {
  AnimationController _controller;
  Animation<Offset> _offsetAnimation;
  final double _drawerMaxWidth = 200.0;
 
  @override
  void initState() {
    super.initState();
    _controller = AnimationController(
      vsync: this,
      duration: Duration(milliseconds: 200),
    );
    _offsetAnimation = Tween<Offset>(
      begin: Offset.zero,
      end: Offset(_drawerMaxWidth / MediaQuery.of(context).size.width, 0),
    ).animate(_controller);
  }
 
  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }
 
  void _toggleDrawer() {
    if (_controller.status == AnimationStatus.completed) {
      _controller.reverse();
    } else {
      _controller.forward();
    }
  }
 
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Drawer Animation Example'),
        leading: IconButton(
          icon: Icon(Icons.menu),
          onPressed: _toggleDrawer,
        ),
      ),
      body: Center(
        child: Text('Tap on menu button to open drawer'),
      ),
      drawer: SlideTransition(
        position: _offsetAnimation,
        child: Drawer(
          child: Container(
            width: _drawerMaxWidth,
            child: ListView(
              children: <Widget>[
                ListTile(
                  title: Text('Item 1'),
                  onTap: _toggleDrawer,
                ),
                ListTile(
                  title: Text('Item 2'),
                  onTap: _toggleDrawer,
                ),
                // ... more list items
              ],
            ),
          ),
        ),
      ),
    );
  }
}

在这个例子中，我们定义了一个_toggleDrawer方法来切换抽屉的打开和关闭状态。通过SlideTransition来实现位置动画，并