Flutter 颤振中超时按钮的实现
用户可以点击按钮直到计时器结束。我不知道如何开始布局。对于这种情况,颤振sdk是否有任何内置(或类似的实现)小部件 试试这个:Flutter 颤振中超时按钮的实现,flutter,dart,button,timer,progress-bar,Flutter,Dart,Button,Timer,Progress Bar,用户可以点击按钮直到计时器结束。我不知道如何开始布局。对于这种情况,颤振sdk是否有任何内置(或类似的实现)小部件 试试这个: class Button extends StatefulWidget { @override _ButtonState createState() => _ButtonState(); } class _ButtonState extends State<Button> { double progress; Timer timer;
class Button extends StatefulWidget {
@override
_ButtonState createState() => _ButtonState();
}
class _ButtonState extends State<Button> {
double progress;
Timer timer;
@override
void initState() {
timer = Timer.periodic(Duration(milliseconds: 50), (timer) {
if (progress <= 0) return timer.cancel();
setState(() {
progress -= 0.0025;
});
});
progress = 1;
super.initState();
}
@override
void dispose() {
timer.cancel();
super.dispose();
}
@override
Widget build(BuildContext context) {
return ClipRRect(
borderRadius: BorderRadius.circular(5),
child: Container(
height: 70,
width: 200,
child: Stack(
alignment: Alignment.center,
children: [
SizedBox.expand(
child: LinearProgressIndicator(
value: progress,
backgroundColor: Colors.grey,
valueColor: AlwaysStoppedAnimation(Colors.green),
),
),
Text(
'Button',
style: TextStyle(color: Colors.white),
),
],
),
),
);
}
}
class按钮扩展StatefulWidget{
@凌驾
_ButtonState createState()=>\u ButtonState();
}
类_ButtonState扩展状态{
双重进步;
定时器;
@凌驾
void initState(){
计时器=计时器。周期性(持续时间(毫秒:50),(计时器){
如果(progress您可以使用CustomPainter
小部件轻松实现它。请检查下面的源代码,并根据您的需要进行调整
导入“dart:async”;
进口“包装:颤振/材料.省道”;
类MyProgressButton扩展StatefulWidget{
@凌驾
_MyProgressButtonState createState()=>\u MyProgressButtonState();
}
类_MyProgressButtonState扩展状态{
定时器(u定时器),;
int _progress=0;
int_totalActionTimeInSeconds=3;
void _initCounter(){
_计时器?.cancel();
_进度=0;
_计时器=计时器。周期性(常量持续时间(毫秒:50),(41;{
设置状态(()=>_进度+=50);
if(持续时间(毫秒):进度.unseconds>=\u TotalActionTimeUnseconds){
_timer.cancel();
//做点什么
}
});
}
void_stopCounter(){
_计时器?.cancel();
设置状态(()=>_进度=0);
}
@凌驾
小部件构建(构建上下文){
返回手势检测器(
onTapDown:()=>_initCounter(),
onTapUp:()=>_停止计数器(),
孩子:定制油漆(
画师:_MyCustomButtonPainter((_progress/1000)/_totalActionTimeInSeconds),
子:容器(
对齐:对齐.center,
宽度:500.0,
高度:200.0,
child:Text('Press me'),
),
),
);
}
}
类_MyCustomButtonPainer扩展CustomPainter{
const_MyCustomButtonPainter(本进度);
最终双倍进展;
@凌驾
空心油漆(帆布,尺寸){
最终油漆=油漆()…颜色=颜色。灰色;
最终双按钮宽度=尺寸。宽度;
最终双钮扣高度=尺寸。高度;
画布.绘图更正(
从矩形到半径(
垂直于LTRB(0.0,0.0,按钮宽度,按钮宽度),
圆形半径(5.0),
),
油漆,
);
paint.color=Colors.green;
画布.绘图更正(
从矩形到半径(
LTRB的矩形(0.0,0.0,进度*按钮宽度,按钮宽度),
圆形半径(5.0),
),
油漆,
);
}
@凌驾
bool应该重新绘制(\u MyCustomButtonPainter oldDelegate)=>this.progress!=oldDelegate.progress;
}
试试这个类似的答案事实上,我也是这么做的。哈哈哈!))
import 'dart:async';
import 'package:flutter/material.dart';
class MyProgressButton extends StatefulWidget {
@override
_MyProgressButtonState createState() => _MyProgressButtonState();
}
class _MyProgressButtonState extends State<MyProgressButton> {
Timer _timer;
int _progress = 0;
int _totalActionTimeInSeconds = 3;
void _initCounter() {
_timer?.cancel();
_progress = 0;
_timer = Timer.periodic(const Duration(milliseconds: 50), (_) {
setState(() => _progress += 50);
if (Duration(milliseconds: _progress).inSeconds >= _totalActionTimeInSeconds) {
_timer.cancel();
// Do something
}
});
}
void _stopCounter() {
_timer?.cancel();
setState(() => _progress = 0);
}
@override
Widget build(BuildContext context) {
return GestureDetector(
onTapDown: (_) => _initCounter(),
onTapUp: (_) => _stopCounter(),
child: CustomPaint(
painter: _MyCustomButtonPainter((_progress / 1000) / _totalActionTimeInSeconds),
child: Container(
alignment: Alignment.center,
width: 500.0,
height: 200.0,
child: Text('Press me'),
),
),
);
}
}
class _MyCustomButtonPainter extends CustomPainter {
const _MyCustomButtonPainter(this.progress);
final double progress;
@override
void paint(Canvas canvas, Size size) {
final Paint paint = Paint()..color = Colors.grey;
final double buttonWidth = size.width;
final double buttonHeight = size.height;
canvas.drawRRect(
RRect.fromRectAndRadius(
Rect.fromLTRB(0.0, 0.0, buttonWidth, buttonHeight),
Radius.circular(5.0),
),
paint,
);
paint.color = Colors.green;
canvas.drawRRect(
RRect.fromRectAndRadius(
Rect.fromLTRB(0.0, 0.0, progress * buttonWidth, buttonHeight),
Radius.circular(5.0),
),
paint,
);
}
@override
bool shouldRepaint(_MyCustomButtonPainter oldDelegate) => this.progress != oldDelegate.progress;
}