How to use 'CupertinoFullscreenDialogTransition'? - flutter

Question

I didn't find any example for constructor CupertinoFullscreenDialogTransition
https://api.flutter.dev/flutter/cupertino/CupertinoFullscreenDialogTransition-class.html
I tried to understand below code but I didn't get it.
CupertinoFullscreenDialogTransition({
Key key,
#required Animation<double> animation,
#required this.child,
}) : _positionAnimation = CurvedAnimation(
parent: animation,
curve: Curves.linearToEaseOut,
// The curve must be flipped so that the reverse animation doesn't play
// an ease-in curve, which iOS does not use.
reverseCurve: Curves.linearToEaseOut.flipped,
).drive(_kBottomUpTween),
super(key: key);

Answer 1

Here's a more complete example
import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
static const String _title = 'AppBar tutorial';
#override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData(
brightness: Brightness.light,
primaryColor: Colors.blue[900],
appBarTheme: AppBarTheme(iconTheme: IconThemeData(color: Colors.white)),
),
title: _title,
home: CupertinoFullscreenDialogTransitionPage(),
);
}
}
//First Page
class CupertinoFullscreenDialogTransitionPage extends StatefulWidget {
#override
_CupertinoFullscreenDialogTransitionState createState() =>
_CupertinoFullscreenDialogTransitionState();
}
class _CupertinoFullscreenDialogTransitionState
extends State<CupertinoFullscreenDialogTransitionPage> {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: PreferredSize(
preferredSize: Size.fromHeight(60),
child: AppBar(
title: Text("Cupertino Screen Transition"),
centerTitle: true,
),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
CupertinoButton.filled(
child: Text("Next Page Cupertino Transition"),
onPressed: () => Navigator.of(context).push(
PageRouteBuilder(
opaque: false,
pageBuilder: (context, _, __) {
return FullDialogPage();
},
),
),
),
],
)),
);
}
}
//Second Page
class FullDialogPage extends StatefulWidget {
#override
_FullDialogPageState createState() => _FullDialogPageState();
}
class _FullDialogPageState extends State<FullDialogPage>
with TickerProviderStateMixin {
AnimationController _primary, _secondary;
Animation<double> _animationPrimary, _animationSecondary;
#override
void initState() {
//Primaty
_primary = AnimationController(vsync: this, duration: Duration(seconds: 1));
_animationPrimary = Tween<double>(begin: 0, end: 1)
.animate(CurvedAnimation(parent: _primary, curve: Curves.easeOut));
//Secondary
_secondary =
AnimationController(vsync: this, duration: Duration(seconds: 1));
_animationSecondary = Tween<double>(begin: 0, end: 1)
.animate(CurvedAnimation(parent: _secondary, curve: Curves.easeOut));
_primary.forward();
super.initState();
}
#override
void dispose() {
_primary.dispose();
_secondary.dispose();
super.dispose();
}
#override
Widget build(BuildContext context) {
return CupertinoFullscreenDialogTransition(
primaryRouteAnimation: _animationPrimary,
secondaryRouteAnimation: _animationSecondary,
linearTransition: false,
child: Scaffold(
appBar: AppBar(
backgroundColor: Colors.indigo[900],
title: Text("Testing"),
leading: IconButton(
icon: Icon(Icons.arrow_back),
onPressed: () {
_primary.reverse();
Future.delayed(Duration(seconds: 1), () {
Navigator.of(context).pop();
});
},
),
),
),
);
}
}

Answer 2

I've made this simple example, I hope it helps you understand how to implement the CupertinoFullscreenDialogTransition Widget.
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.orange,
),
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> with SingleTickerProviderStateMixin{
AnimationController _animationController;
#override
void initState() {
_animationController = AnimationController(
vsync: this,
duration: Duration(milliseconds: 500),
);
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Stackoverflow playground'),
),
body: Container(
child: Column(
children: <Widget>[
CupertinoFullscreenDialogTransition(
primaryRouteAnimation: _animationController,
secondaryRouteAnimation: _animationController,
linearTransition: false,
child: Center(
child: Container(
color: Colors.blueGrey,
width: 300,
height: 300,
),
),
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: <Widget>[
RaisedButton(
onPressed: () => _animationController.forward(),
child: Text('Forward'),
),
RaisedButton(
onPressed: () => _animationController.reverse(),
child: Text('Reverse'),
),
],
),
],
),
)
);
}
}