On a button click show dialog as -
showDialog(
context: context,
builder: (_) => LogoutOverlay(),
);
Dialog design with two buttons -
class LogoutOverlay extends StatefulWidget {
@override
State<StatefulWidget> createState() => LogoutOverlayState();
}
class LogoutOverlayState extends State<LogoutOverlay>
with SingleTickerProviderStateMixin {
AnimationController controller;
Animation<double> scaleAnimation;
@override
void initState() {
super.initState();
controller =
AnimationController(vsync: this, duration: Duration(milliseconds: 450));
scaleAnimation =
CurvedAnimation(parent: controller, curve: Curves.elasticInOut);
controller.addListener(() {
setState(() {});
});
controller.forward();
}
@override
Widget build(BuildContext context) {
return Center(
child: Material(
color: Colors.transparent,
child: ScaleTransition(
scale: scaleAnimation,
child: Container(
margin: EdgeInsets.all(20.0),
padding: EdgeInsets.all(15.0),
height: 180.0,
decoration: ShapeDecoration(
color: Color.fromRGBO(41, 167, 77, 10),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(15.0))),
child: Column(
children: <Widget>[
Expanded(
child: Padding(
padding: const EdgeInsets.only(
top: 30.0, left: 20.0, right: 20.0),
child: Text(
"Are you sure, you want to logout?",
style: TextStyle(color: Colors.white, fontSize: 16.0),
),
)),
Expanded(
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Padding(
padding: const EdgeInsets.all(10.0),
child: ButtonTheme(
height: 35.0,
minWidth: 110.0,
child: RaisedButton(
color: Colors.white,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(5.0)),
splashColor: Colors.white.withAlpha(40),
child: Text(
'Logout',
textAlign: TextAlign.center,
style: TextStyle(
color: Colors.green,
fontWeight: FontWeight.bold,
fontSize: 13.0),
),
onPressed: () {
setState(() {
Route route = MaterialPageRoute(
builder: (context) => LoginScreen());
Navigator.pushReplacement(context, route);
});
},
)),
),
Padding(
padding: const EdgeInsets.only(
left: 20.0, right: 10.0, top: 10.0, bottom: 10.0),
child: ButtonTheme(
height: 35.0,
minWidth: 110.0,
child: RaisedButton(
color: Colors.white,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(5.0)),
splashColor: Colors.white.withAlpha(40),
child: Text(
'Cancel',
textAlign: TextAlign.center,
style: TextStyle(
color: Colors.green,
fontWeight: FontWeight.bold,
fontSize: 13.0),
),
onPressed: () {
setState(() {
/* Route route = MaterialPageRoute(
builder: (context) => LoginScreen());
Navigator.pushReplacement(context, route);
*/ });
},
))
),
],
))
],
)),
),
),
);
}
}
I would recommend the [Layouts][1], [Interactivity][2], and [Animation][3] tutorials. The [codelab][4] is also a good way to learn your way around Flutter.
Here's a sketch of how to build your app.
[![screenshot][5]][5]
import 'dart:math' as math;
import 'package:meta/meta.dart';
import 'package:flutter/material.dart';
void main() {
runApp(new MaterialApp(
theme: new ThemeData(
canvasColor: Colors.deepPurple,
iconTheme: new IconThemeData(color: Colors.white),
accentColor: Colors.pinkAccent,
brightness: Brightness.dark,
),
home: new MyHomePage(),
));
}
class ProgressPainter extends CustomPainter {
ProgressPainter({
@required this.animation,
@required this.backgroundColor,
@required this.color,
}) : super(repaint: animation);
/// Animation representing what we are painting
final Animation<double> animation;
/// The color in the background of the circle
final Color backgroundColor;
/// The foreground color used to indicate progress
final Color color;
@override
void paint(Canvas canvas, Size size) {
Paint paint = new Paint()
..color = backgroundColor
..strokeWidth = 5.0
..strokeCap = StrokeCap.round
..style = PaintingStyle.stroke;
canvas.drawCircle(size.center(Offset.zero), size.width / 2.0, paint);
paint.color = color;
double progressRadians = (1.0 - animation.value) * 2 * math.PI;
canvas.drawArc(
Offset.zero & size, math.PI * 1.5, -progressRadians, false, paint);
}
@override
bool shouldRepaint(ProgressPainter other) {
return animation.value != other.animation.value ||
color != other.color ||
backgroundColor != other.backgroundColor;
}
}
class MyHomePage extends StatefulWidget {
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> with TickerProviderStateMixin {
List<IconData> icons = <IconData>[
Icons.alarm, Icons.access_time, Icons.hourglass_empty, Icons.timer,
];
AnimationController _controller;
String get timeRemaining {
Duration duration = _controller.duration * _controller.value;
return '${duration.inMinutes} ${(duration.inSeconds % 60)
.toString()
.padLeft(2, '0')}';
}
@override
void initState() {
super.initState();
_controller = new AnimationController(
vsync: this,
duration: const Duration(seconds: 12),
)
..reverse(from: 0.4);
}
Widget build(BuildContext context) {
ThemeData themeData = Theme.of(context);
return new Scaffold(
body: new Padding(
padding: const EdgeInsets.all(10.0),
child:
new Column(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
new Row(
mainAxisAlignment: MainAxisAlignment.start,
children: icons.map((IconData iconData) {
return new Container(
margin: new EdgeInsets.all(10.0),
child: new IconButton(
icon: new Icon(iconData), onPressed: () {
// TODO: Implement
}),
);
}).toList(),
),
new Expanded(
child: new Align(
alignment: FractionalOffset.center,
child: new AspectRatio(
aspectRatio: 1.0,
child: new Stack(
children: <Widget>[
new Positioned.fill(
child: new AnimatedBuilder(
animation: _controller,
builder: (BuildContext context, Widget child) {
return new CustomPaint(
painter: new ProgressPainter(
animation: _controller,
color: themeData.indicatorColor,
backgroundColor: Colors.white,
),
);
}
),
),
new Align(
alignment: FractionalOffset.center,
child: new Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
new Text(
'Label', style: themeData.textTheme.subhead),
new AnimatedBuilder(
animation: _controller,
builder: (BuildContext context, Widget child) {
return new Text(
timeRemaining,
style: themeData.textTheme.display4,
);
}
),
new Text('+1', style: themeData.textTheme.title),
],
),
),
],
),
),
),
),
new Container(
margin: new EdgeInsets.all(10.0),
child: new Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
new IconButton(icon: new Icon(Icons.delete), onPressed: () {
// TODO: Implement delete
}),
new FloatingActionButton(
child: new AnimatedBuilder(
animation: _controller,
builder: (BuildContext context, Widget child) {
return new Icon(
_controller.isAnimating
? Icons.pause
: Icons.play_arrow
);
},
),
onPressed: () {
if (_controller.isAnimating)
_controller.stop();
else {
_controller.reverse(
from: _controller.value == 0.0 ? 1.0 : _controller
.value,
);
}
},
),
new IconButton(
icon: new Icon(Icons.alarm_add), onPressed: () {
// TODO: Implement add time
}),
],
),
),
],
),
),
);
}
}
[1]: https://flutter.io/tutorials/layout/
[2]: https://flutter.io/tutorials/interactive/
[3]: https://flutter.io/animations/
[4]: https://codelabs.developers.google.com/codelabs/flutter/index.html#0
[5]: https://i.stack.imgur.com/Y1gKR.png
