Flutter animating change dialog height - flutter

Question

Here we solved changing the dialog height, now how can I animate this changing height of dialog.
Full source code:
void main() => runApp(MaterialApp(home: DialogCustomHeight()));
class DialogCustomHeight extends StatefulWidget {
#override
State<StatefulWidget> createState() => DialogCustomHeightState();
}
class DialogCustomHeightState extends State<DialogCustomHeight> {
bool fullScreenDialog = false;
#override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: RaisedButton(
color: Colors.white,
child: Text('show dialog'),
onPressed: () => _showDialog(),
),
),
);
}
_showDialog() {
bool _fromTop = false;
return showGeneralDialog(
barrierLabel: "Label",
barrierDismissible: true,
barrierColor: Colors.black.withOpacity(0.5),
transitionDuration: Duration(milliseconds: 200),
context: context,
pageBuilder: (context, anim1, anim2) {
return MyDialog(fromTop: _fromTop, fullScreen: fullScreenDialog);
},
transitionBuilder: (context, anim1, anim2, child) {
return FadeTransition(
opacity: new CurvedAnimation(parent: anim1, curve: Curves.easeOut),
child: SlideTransition(
position: Tween(begin: Offset(0, _fromTop ? -0.1 : 0.1), end: Offset(0, 0)).animate(anim1),
child: child,
),
);
},
);
}
}
class MyDialog extends StatefulWidget {
final bool fromTop;
final bool fullScreen;
const MyDialog({Key key, this.fromTop, this.fullScreen}) : super(key: key);
#override
_MyDialogState createState() => _MyDialogState();
}
class _MyDialogState extends State<MyDialog> {
bool _fromTop, _fullScreen;
#override
void initState() {
super.initState();
_fromTop = widget.fromTop;
_fullScreen = widget.fullScreen;
}
#override
Widget build(BuildContext context) {
return Align(
alignment: _fromTop ? Alignment.topCenter : Alignment.bottomCenter,
child: Container(
height: _fullScreen ? MediaQuery.of(context).size.height : MediaQuery.of(context).size.height * 0.500,
child: SizedBox.expand(
child: ClipRRect(
borderRadius: BorderRadius.only(
bottomRight: Radius.circular(10.0),
bottomLeft: Radius.circular(10.0),
),
child: Container(
color: Colors.green,
child: Center(
child: RaisedButton(
color: Colors.white,
child: Text('change height'),
onPressed: () {
setState(() {
_fullScreen = !_fullScreen;
});
},
),
),
),
),
),
),
);
}
}

Answer 1

All you need to do is use AnimatedContainer and give it a duration. That's all
#override
Widget build(BuildContext context) {
return Align(
alignment: _fromTop ? Alignment.topCenter : Alignment.bottomCenter,
child: AnimatedContainer(
duration: Duration(seconds: 1),
height: _fullScreen ? MediaQuery.of(context).size.height : MediaQuery.of(context).size.height * 0.5,
child: SizedBox.expand(
child: ClipRRect(
borderRadius: BorderRadius.only(
bottomRight: Radius.circular(20.0),
bottomLeft: Radius.circular(20.0),
),
child: Container(
color: Colors.teal,
child: Center(
child: RaisedButton(
child: Text('change height'),
onPressed: () {
setState(() {
_fullScreen = !_fullScreen;
});
},
),
),
),
),
),
),
);
}