Flutter开发过程中,Drawer控件的使用频率也是比较高的,其实有过移动端开发经验的人来说,Flutter中的Drawer控件就相当于ios开发或者Android开发中的“抽屉”效果,从侧边栏滑出导航菜单。对于Flutter中的Drawer控件的常规用法就不多介绍,网上大把的教程。
那么本篇博文分享一个网上教程不多的一个知识点,那就是自定义Drawer的滑出位置的大小,自定义Drawer滑出位置就需要修改一个double的widthPercent属性,widthPercent一般默认值是0.7,然后想要修改widthPercent的默认值,或者设置想要的任何大于0小于1之间的值都可以根据这个来设置。具体操作如下所示:
1、首先封装这个方法(看官可以直接复制使用)
class CustomDrawer extends StatelessWidget { final double elevation; final Widget child; final String semanticLabel; final double widthPercent; const CustomDrawer({ Key key, this.elevation = 16.0, this.child, this.semanticLabel, this.widthPercent = 0.7, }) : assert(widthPercent!=null&&widthPercent<1.0&&widthPercent>0.0) ,super(key: key); @override Widget build(BuildContext context) { assert(debugCheckHasMaterialLocalizations(context)); String label = semanticLabel; switch (defaultTargetPlatform) { case TargetPlatform.iOS: label = semanticLabel; break; case TargetPlatform.android: case TargetPlatform.fuchsia: label = semanticLabel ?? MaterialLocalizations.of(context)?.drawerLabel; } final double _width=MediaQuery.of(context).size.width*widthPercent; return Semantics( scopesRoute: true, namesRoute: true, explicitChildNodes: true, label: label, child: ConstrainedBox( constraints: BoxConstraints.expand(width: _width), child: Material( elevation: elevation, child: child, ), ), ); } }
2、调用的地方
@override Widget build(BuildContext context) { return InkWell( onTap: () { Navigator.of(context).pop(); Navigator.of(context).push(new MaterialPageRoute( builder: (BuildContext context) => new AccountManagersPage(''))); }, child: new CustomDrawer( //调用修改Drawer的方法 widthPercent:0.5, //设置Drawer滑出位置居屏幕的一半宽度 child: Container( color: Color(0xFF1F1D5B), child: Column( children:[ Expanded( child: ListView(children: [ Column( children: [ ListTile( title: Text('设备列表', style: TextStyle(color: Color(0xFF8B89EF))), contentPadding: EdgeInsets.symmetric( horizontal: 15.0, vertical: 0.0), ), ListTile( leading: CircleAvatar( backgroundImage: new ExactAssetImage( 'images/menu_lamp_pole.png'), radius: 15.0, ), title: Text('灯杆', style: TextStyle( color: Color(0xFFffffff), fontSize: 18.0, )), onTap: () { Navigator.of(context).pop(); //Navigator.of(context).push(new MaterialPageRoute(builder:(BuildContext context) => new BigScreenPage(0,'灯杆列表'))); Navigator.of(context).push(new MaterialPageRoute( builder: (BuildContext context) => new MainPoleView())); }), // Divider(), ListTile( leading: CircleAvatar( backgroundImage: new ExactAssetImage('images/menu_charge.png'), radius: 15.0, ), title: Text('充电桩', style: TextStyle( color: Color(0xFFffffff), fontSize: 18.0, )), onTap: () { Navigator.of(context).pop(); Navigator.of(context).push(new MaterialPageRoute( builder: (BuildContext context) => new BigScreenPage(6, '充电桩列表'))); }), ], ) ]), ) ], ), ), ), ); }
实现效果如下所示:
总结
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