Flutter 如何绘制简单的单选按钮?
我想在颤振上按此按钮作为练习: 以下是我已经做过的:Flutter 如何绘制简单的单选按钮?,flutter,dart,Flutter,Dart,我想在颤振上按此按钮作为练习: 以下是我已经做过的: Stack( children: [ Align( alignment: Alignment.center, child: ClipOval( child: Container(
Stack(
children: [
Align(
alignment: Alignment.center,
child: ClipOval(
child: Container(
color: Colors.grey,
width: 15,
height: 15),
)),
ClipOval(
child: Center(
child: Container(
color: widget.selected == i
? Color(0xFF3ACE00)
: Colors.grey,
width: 11,
height: 11)),
),
],
)
这两个问题是:
即使我使用Align
我无法像在图像中那样在按钮上绘制边框,ClipOval没有此选项您可以使用
容器
小部件
以下是如何:
class MyWidget extends StatelessWidget {
final bool checked;
MyWidget({this.checked});
@override
Widget build(BuildContext context) {
return Container(
width: 50,
height: 50,
decoration: BoxDecoration(
color: Colors.white,
shape: BoxShape.circle,
border: Border.all(color: Colors.black, width: 3.0),
),
child: Container(
margin: EdgeInsets.all(10.0),
decoration: BoxDecoration(
color: checked ? Colors.green : Colors.red,
shape: BoxShape.circle,
),
));
}
}
完整示例:
// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
debugShowCheckedModeBanner: false,
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
bool checked = false;
void _toggle() {
setState(() {
checked = !checked;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Container(
height: double.infinity,
child: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
InkWell(
onTap: _toggle,
child: MyWidget(checked: checked),
),
Text(checked ? "checked" : "unchecked")
]),
)));
}
}
class MyWidget extends StatelessWidget {
final bool checked;
MyWidget({this.checked});
@override
Widget build(BuildContext context) {
return Container(
width: 50,
height: 50,
decoration: BoxDecoration(
color: Colors.white,
shape: BoxShape.circle,
border: Border.all(color: Colors.black, width: 3.0),
),
child: Container(
margin: EdgeInsets.all(10.0),
decoration: BoxDecoration(
color: checked ? Colors.green : Colors.red,
shape: BoxShape.circle,
),
));
}
}
//版权所有(c)2019,Dart项目作者。请参阅作者档案
//详情请参阅。版权所有。此源代码的使用受
//可以在许可证文件中找到的BSD样式的许可证。
进口“包装:颤振/材料.省道”;
void main()=>runApp(MyApp());
类MyApp扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
返回材料PP(
标题:“颤振演示”,
debugShowCheckedModeBanner:false,
主题:主题数据(
主样本:颜色。蓝色,
),
主页:MyHomePage(标题:“颤振演示主页”),
);
}
}
类MyHomePage扩展StatefulWidget{
MyHomePage({Key,this.title}):超级(Key:Key);
最后的字符串标题;
@凌驾
_MyHomePageState createState()=>\u MyHomePageState();
}
类_MyHomePageState扩展状态{
bool checked=false;
void _toggle(){
设置状态(){
选中=!选中;
});
}
@凌驾
小部件构建(构建上下文){
返回脚手架(
appBar:appBar(
标题:文本(widget.title),
),
主体:容器(
高度:双无限,
儿童:中心(
子:列(
mainAxisAlignment:mainAxisAlignment.center,
儿童:[
墨水池(
onTap:_切换,
子项:MyWidget(选中:选中),
),
文本(选中?“选中”:“未选中”)
]),
)));
}
}
类MyWidget扩展了无状态Widget{
检查最终bool;
MyWidget({this.checked});
@凌驾
小部件构建(构建上下文){
返回容器(
宽度:50,
身高:50,
装饰:盒子装饰(
颜色:颜色,白色,
形状:BoxShape.circle,
边框:边框。全部(颜色:Colors.black,宽度:3.0),
),
子:容器(
保证金:所有边缘套(10.0),
装饰:盒子装饰(
颜色:选中?颜色。绿色:颜色。红色,
形状:BoxShape.circle,
),
));
}
}