(Offset.zero); // Draw background circle paint.color = backgroundColor; canvas.drawCircle(center, radius, paint); // Calculate the sweep angle based on progress final sweepAngle = progress * 2 * pi; // Draw progress arc paint.color = progressColor; canvas.drawArc( Rect.fromCircle(center...
drawCircle(tangent!.position, ballRadius, paint); } } 示例(两横纵向圆环上滚动的小球) controller = AnimationController(duration: const Duration(seconds: 2), vsync: this); animation = Tween<double>(begin: 0, end: 1.0).animate(CurvedAnimation( parent: controller, curve: Curves.easeInOutSine,...
{ final bool isDone; final double width; final bool isInProgress; final Color backgroundColor; final Color progressColor; CirclePainter({ this.isDone = false, this.width = 4, this.isInProgress = false, required this.progressColor, required this.backgroundColor, }); @override void paint(...
原始的Indicator在滑动时,是固定尺寸的,在Tabbar源码中,我们找到_IndicatorPainter,这个CustomPainter负责了对Indicator的绘制,所以,我们要想获得类似Material组件弹性伸缩的效果,那就必须修改绘制时的宽度,显然,我们来到了paint函数,在这里,发现两个rect——fromRect和toRect,它们执行的lerp操作,就成了我们想要的Indicator动...
drawCircle 画圆 drawOval 画椭圆 drawArc 画圆弧 3. 画笔Paint 现在画布有了,我们最后还缺一个画笔,Flutter提供了Paint类来实现画笔。在Paint中,我们可以配置画笔的各种属性如粗细、颜色、样式等。如: var paint = Paint() //创建一个画笔并配置其属性 ..isAntiAlias = true //是否抗锯齿 ..style = Paint...
circular(10.0) // 圆角 ), // 设置shape为CircleBorder(side:BorderSide(color:Colors.white)) 圆形按钮 onPressed: () { }, ); 通过在外层加Container:设置宽高。通过在外层加Container和Expanded:自适应宽或高。 FlatButton(已弃用) 默认背景透明并不带阴影。按下后,会有背景色。 FlatButton({ Key?
不同类型指示器列表https://pub.dev/packages/percent_indicator 试用此模板代码
shape: CircleBorder(side: BorderSide(color: Colors.white,)) //圆形按钮 class ButtonDemoPage extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text("按钮演示页面"), ), body: Center( child: Column( mainAxisAlignment: MainAxis...
CircleAvatar (circle_avatar.dart) DataTable (data_table.dart) _DropdownMenuItemContainer (dropdown.dart) DropdownMenuItem (dropdown.dart) _DropdownRoutePage (dropdown.dart) DrawerHeader (drawer_header.dart) FlutterLogo (flutter_logo.dart) ...
Circle Indicator(12 ★)—— PageViewer 的圆形指示器,作者是Lung Razvan。 Quick Actions—— 与应用程序的主屏幕快速操作进行交互。 Swiper(12 ★) - Horizontal, Vertical, Partial swipe with indicator byXueliang Ren. 认证 本地身份验证—— Ios 和 Android 上的 Touch ID、锁屏密码和指纹验证 ...