Flutter 如何在flatter中创建按钮

如何以这种方式创建这些按钮？我的学术工作需要。请帮帮我

---

欢迎来到软件与颤振

每个问题都有答案，请检查下面的代码，包括完整的源代码：）

我使用CustomPaint绘制圆角三角形，使用这个方便的网站：

导入“包装：颤振/材料.省道”；
将“dart:ui”导入为ui；
void main（）{
runApp（MyApp（））；
}
类MyApp扩展了无状态小部件{
//此小部件是应用程序的根。
@凌驾
小部件构建（构建上下文）{
返回材料PP(
标题：“颤振演示”，
主题：主题数据(
//这是应用程序的主题。
//
//尝试使用“flutter run”运行应用程序。您将看到
//应用程序有一个蓝色工具栏。然后，在不退出应用程序的情况下，重试
//将下面的primarySwatch更改为Colors.green，然后调用
//“热重新加载”（在运行“颤振运行”的控制台中按“r”，
//或者只需将更改保存到颤振IDE中的“热重新加载”。
//请注意，计数器没有重置回零；应用程序
//未重新启动。
主样本：颜色。蓝色，
//这使视觉密度适应您运行的平台
//上的应用程序。对于桌面平台，控件将更小且更简单
//比移动平台更紧密（密度更高）。
视觉密度：视觉密度。自适应平台密度，
),
主页：MyHomePage（标题：“颤振演示主页”），
);
}
}
类MyHomePage扩展StatefulWidget{
MyHomePage（{Key，this.title}）：超级（Key:Key）；
//此小部件是应用程序的主页。它是有状态的，表示
//它有一个状态对象（定义如下），其中包含影响
//看起来怎么样。
//此类是状态的配置。它保存值（在此
//案例名称）由家长（在本例中为应用程序小部件）提供，以及
//由State的build方法使用。小部件子类中的字段包括
//始终标记为“最终”。
最后的字符串标题；
@凌驾
_MyHomePageState createState（）=>\u MyHomePageState（）；
}
类_MyHomePageState扩展状态{
int _计数器=0；
风险值宽度=192.0；
var高度=48.0；
void _incrementCounter（）{
设置状态（）{
//这个对setState的调用告诉颤振框架，某些东西
//已在此状态下更改，这将导致它重新运行下面的生成方法
//以便显示能够反映更新的值。如果我们更改
//_计数器，而不调用setState（），则生成方法将不可用
//再打一次电话，似乎什么也没发生。
_计数器++；
});
}
@凌驾
小部件构建（构建上下文）{
//每次调用setState时都会重新运行此方法，例如，按done
//通过上面的_incrementCounter方法。
//
//对颤振框架进行了优化，以制定重新运行的构建方法
//快速，这样你就可以重建任何需要更新的东西
//而不是必须单独更改小部件的实例。
返回脚手架(
背景颜色：颜色（0xFF4B0A2B），
appBar:appBar(
//在这里，我们从MyHomePage对象中获取由创建的值
//使用App.build方法，并使用它设置appbar标题。
标题：文本（widget.title），
),
正文：中(
//中心是一个布局小部件。它接受一个子元素并对其进行定位
/在父母的中间。
子：列(
//Column也是一个布局小部件，它包含一系列子项和子项
//垂直排列。默认情况下，它会调整自身大小以适应其位置
//孩子们水平移动，并试图和父母一样高。
//
//调用“调试绘制”（在控制台中按“p”，选择
//Android中颤振检查器的“切换调试绘制”操作
//或Visual Studio代码中的“切换调试绘制”命令）
//查看每个小部件的线框。
//
//列具有各种属性来控制其自身大小和大小
//它如何定位其子对象。这里我们使用mainAxisAlignment
//将子对象垂直居中；此处的主轴是垂直轴
//轴，因为柱是垂直的（交叉轴为
//水平）。
mainAxisAlignment:mainAxisAlignment.center，
儿童：[
容器（宽度：宽度，高度：高度，子项：customButtonWidget（）），
],
),
),
浮动操作按钮：浮动操作按钮(
按下时：\ u递增计数器，
工具提示：“增量”，
子：图标（Icons.add），
)，//此尾随逗号使生成方法的自动格式设置更方便。
);
}
Widget customButtonWidget（）{
列表颜色=[colors.deepOrange，colors.yellow]；
列表停止=[0.0,0.7]；
返回堆栈(
儿童：[
//圆盒
填充物(
填充：边缘方向。从STEB开始（宽度*0.19,0,0,0），
子：容器(
装饰：新盒子装饰(
梯度：线性梯度(
颜色：_颜色，
停止：_停止，
),
borderRadius：仅限新的borderRadius(
左上角：常数半径。圆形（0.0），
右上角：常数半径。圆形（40.0），
右下角：常数半径。圆形（40.0），
左下角：常数半径。圆形（0.0），
)),
孩子：新中心(
子项：新文本（“视图”，textScaleFactor:2.0，），
)),
),
定制油漆(
size:size（64，高度）//您可以将[WIDTH]替换为所需的
import 'package:flutter/material.dart';
import 'dart:ui' as ui;

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
        // This makes the visual density adapt to the platform that you run
        // the app on. For desktop platforms, the controls will be smaller and
        // closer together (more dense) than on mobile platforms.
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  var WIDTH = 192.0;
  var HEIGHT = 48.0;

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      backgroundColor: Color(0xFF4B0A2B),
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also a layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Container(width: WIDTH, height: HEIGHT, child: customButtonWidget()),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }

  Widget customButtonWidget() {
    List<Color> _colors = [Colors.deepOrange, Colors.yellow];
    List<double> _stops = [0.0, 0.7];
    return Stack(
      children: [
        // round box
        Padding(
          padding: EdgeInsetsDirectional.fromSTEB(WIDTH*0.19, 0, 0, 0),
          child: Container(
              decoration: new BoxDecoration(
                  gradient: LinearGradient(
                    colors: _colors,
                    stops: _stops,
                  ),
                  borderRadius: new BorderRadius.only(
                    topLeft: const Radius.circular(0.0),
                    topRight: const Radius.circular(40.0),
                    bottomRight: const Radius.circular(40.0),
                    bottomLeft: const Radius.circular(0.0),
                  )),
              child: new Center(
                child: new Text("View",textScaleFactor: 2.0,),
              )),
        ),
        CustomPaint(
          size: Size(64, HEIGHT), //You can Replace [WIDTH] with your desired width for Custom Paint and height will be calculated automatically
          painter: RPSCustomPainter(),
        ),
      ],
    );
  }
}


class RPSCustomPainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {

    Path path_0 = Path();
    path_0.moveTo(size.width*0.6154700,size.height*0.9259259);
    path_0.cubicTo(size.width*0.5641500,size.height*1.024691,size.width*0.4358500,size.height*1.024691,size.width*0.3845300,size.height*0.9259259);
    path_0.lineTo(size.width*0.02368650,size.height*0.2314815);
    path_0.cubicTo(size.width*-0.02763350,size.height*0.1327159,size.width*0.03651650,size.height*0.009259167,size.width*0.1391565,size.height*0.009259185);
    path_0.lineTo(size.width*0.8608450,size.height*0.009259241);
    path_0.cubicTo(size.width*0.9634850,size.height*0.009259259,size.width*1.027635,size.height*0.1327161,size.width*0.9763150,size.height*0.2314815);
    path_0.lineTo(size.width*0.6154700,size.height*0.9259259);
    path_0.close();

    Paint paint_0_fill = Paint()..style=PaintingStyle.fill;
    paint_0_fill.shader = ui.Gradient.linear(Offset(size.width,size.height*0.5000000), Offset(size.width*0.1166667,size.height*0.5000000),
        [Color(0xffcccccc).withOpacity(1),Colors.white.withOpacity(1)], [0,1]);
    canvas.drawPath(path_0,paint_0_fill);
    Paint paint_0_stroke = Paint()..style=PaintingStyle.stroke;
    paint_0_stroke.shader = ui.Gradient.linear(Offset(size.width,size.height*0.5000000), Offset(size.width*0.1166667,size.height*0.5000000),
        [Color(0xffffff).withOpacity(1),Colors.white.withOpacity(0.9)], [0,1]);
    paint_0_stroke.strokeWidth=3;
    canvas.drawPath(path_0,paint_0_stroke);

  }

  @override
  bool shouldRepaint(covariant CustomPainter oldDelegate) {
    return true;
  }
}