how to implement button with timeout in flutter
434
Solution 1
You can easily achieve it with a CustomPainter
widget. Check the source code below and tweak it to your needs.
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;
}
Solution 2
Try this:
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),
),
],
),
),
);
}
}