Flutter 你好,我如何才能添加一个圆形加载指示器到我的按钮-颤振
我有一个颤振代码。我不想在单击submit按钮时什么也不显示,而是想在单击按钮时显示循环加载指示器,以便让用户保持忙碌,但我面临的挑战是如何将我的教程转换为我的代码 以下是教程:Flutter 你好,我如何才能添加一个圆形加载指示器到我的按钮-颤振,flutter,dart,flutter-layout,flutter-dependencies,flutter-web,Flutter,Dart,Flutter Layout,Flutter Dependencies,Flutter Web,我有一个颤振代码。我不想在单击submit按钮时什么也不显示,而是想在单击按钮时显示循环加载指示器,以便让用户保持忙碌,但我面临的挑战是如何将我的教程转换为我的代码 以下是教程: ... children: <Widget>[ new Padding( padding: const EdgeInsets.all(16.0), child: new MaterialButton(
...
children: <Widget>[
new Padding(
padding: const EdgeInsets.all(16.0),
child: new MaterialButton(
child: setUpButtonChild(),
onPressed: () {
setState(() {
if (_state == 0) {
animateButton();
}
});
},
elevation: 4.0,
minWidth: double.infinity,
height: 48.0,
color: Colors.lightGreen,
),
)
],
Widget setUpButtonChild() {
if (_state == 0) {
return new Text(
"Click Here",
style: const TextStyle(
color: Colors.white,
fontSize: 16.0,
),
);
} else if (_state == 1) {
return CircularProgressIndicator(
valueColor: AlwaysStoppedAnimation<Color>(Colors.white),
);
} else {
return Icon(Icons.check, color: Colors.white);
}
}
void animateButton() {
setState(() {
_state = 1;
});
Timer(Duration(milliseconds: 1000), () {
setState(() {
_state = 2;
});
});
Timer(Duration(milliseconds: 3300), () {
Navigator.of(context).push(
MaterialPageRoute(
builder: (context) => AnchorsPage(),
),
);
});
}
您可以复制粘贴运行下面的完整代码
您可以直接使用软件包
或参考其源代码
您可以将
AnimationController
传递到http
作业并使用controller.forward
和reset
代码片段
void httpJob(AnimationController controller) async {
controller.forward();
print("delay start");
await Future.delayed(Duration(seconds: 3), () {});
print("delay stop");
controller.reset();
}
...
ProgressButton(
borderRadius: BorderRadius.all(Radius.circular(8)),
strokeWidth: 2,
child: Text(
"Sample",
style: TextStyle(
color: Colors.white,
fontSize: 24,
),
),
onPressed: (AnimationController controller) async {
await httpJob(controller);
}
工作演示
完整代码
import 'package:flutter/material.dart';
import 'package:progress_indicator_button/progress_button.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
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> {
int _counter = 0;
void _incrementCounter() {
setState(() {
_counter++;
});
}
void httpJob(AnimationController controller) async {
controller.forward();
print("delay start");
await Future.delayed(Duration(seconds: 3), () {});
print("delay stop");
controller.reset();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Container(
width: 200,
height: 60,
child: ProgressButton(
borderRadius: BorderRadius.all(Radius.circular(8)),
strokeWidth: 2,
child: Text(
"Sample",
style: TextStyle(
color: Colors.white,
fontSize: 24,
),
),
onPressed: (AnimationController controller) async {
await httpJob(controller);
},
),
),
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
导入“包装:颤振/材料.省道”;
导入“package:progress_indicator_button/progress_button.dart”;
void main(){
runApp(MyApp());
}
类MyApp扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
返回材料PP(
标题:“颤振演示”,
主题:主题数据(
主样本:颜色。蓝色,
视觉密度:视觉密度。自适应平台密度,
),
主页:MyHomePage(标题:“颤振演示主页”),
);
}
}
类MyHomePage扩展StatefulWidget{
MyHomePage({Key,this.title}):超级(Key:Key);
最后的字符串标题;
@凌驾
_MyHomePageState createState()=>\u MyHomePageState();
}
类_MyHomePageState扩展状态{
int _计数器=0;
void _incrementCounter(){
设置状态(){
_计数器++;
});
}
无效httpJob(AnimationController)异步{
controller.forward();
打印(“延迟启动”);
等待未来。延迟(持续时间(秒:3),({});
打印(“延迟停止”);
controller.reset();
}
@凌驾
小部件构建(构建上下文){
返回脚手架(
appBar:appBar(
标题:文本(widget.title),
),
正文:中(
子:列(
mainAxisAlignment:mainAxisAlignment.center,
儿童:[
容器(
宽度:200,
身高:60,
孩子:前进按钮(
borderRadius:borderRadius.all(半径圆形(8)),
冲程宽度:2,
子:文本(
“样本”,
样式:TextStyle(
颜色:颜色,白色,
尺寸:24,
),
),
onPressed:(AnimationController)异步{
等待httpJob(控制器);
},
),
),
正文(
“您已经按了这么多次按钮:”,
),
正文(
“$”计数器“,
风格:Theme.of(context).textTheme.headline4,
),
],
),
),
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),
),
);
}
}
import 'package:flutter/material.dart';
import 'package:progress_indicator_button/progress_button.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
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> {
int _counter = 0;
void _incrementCounter() {
setState(() {
_counter++;
});
}
void httpJob(AnimationController controller) async {
controller.forward();
print("delay start");
await Future.delayed(Duration(seconds: 3), () {});
print("delay stop");
controller.reset();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Container(
width: 200,
height: 60,
child: ProgressButton(
borderRadius: BorderRadius.all(Radius.circular(8)),
strokeWidth: 2,
child: Text(
"Sample",
style: TextStyle(
color: Colors.white,
fontSize: 24,
),
),
onPressed: (AnimationController controller) async {
await httpJob(controller);
},
),
),
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}