问题描述
您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。
解决方法
欢迎使用 SOF 和 Flutter。
每个问题都有答案，请查看下面的代码，包含完整的源代码:)
我使用 CustomPaint 绘制圆角三角形，使用这个方便的网站：https://fluttershapemaker.com/
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),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.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,[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,[Color(0xffffff).withOpacity(1),Colors.white.withOpacity(0.9)],1]);
paint_0_stroke.strokeWidth=3;
canvas.drawPath(path_0,paint_0_stroke);
}
@override
bool shouldRepaint(covariant CustomPainter oldDelegate) {
return true;
}
}
您可以使用 ElevatedButton 小部件
Widget buttonElevated() {
return
ElevatedButton(
child: Text("Elevated Button",style: TextStyle(fontSize: 30))
onPressed: onPress,//function
);
}