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import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
class Destination {
const Destination(this.index, this.title, this.icon, this.color);
final int index;
final String title;
final IconData icon;
final MaterialColor color;
}
const List<Destination> allDestinations = <Destination>[
Destination(0, 'Home', Icons.home, Colors.teal),
Destination(1, 'Business', Icons.business, Colors.cyan),
Destination(2, 'School', Icons.school, Colors.orange),
Destination(3, 'Flight', Icons.flight, Colors.blue)
];
class RootPage extends StatelessWidget {
const RootPage({ Key key, this.destination }) : super(key: key);
final Destination destination;
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(destination.title),
backgroundColor: destination.color,
),
backgroundColor: destination.color[50],
body: SizedBox.expand(
child: InkWell(
onTap: () {
Navigator.pushNamed(context, "/list");
},
),
),
);
}
}
class ListPage extends StatelessWidget {
const ListPage({ Key key, this.destination }) : super(key: key);
final Destination destination;
@override
Widget build(BuildContext context) {
const List<int> shades = <int>[50, 100, 200, 300, 400, 500, 600, 700, 800, 900];
return Scaffold(
appBar: AppBar(
title: Text(destination.title),
backgroundColor: destination.color,
),
backgroundColor: destination.color[50],
body: SizedBox.expand(
child: ListView.builder(
itemCount: shades.length,
itemBuilder: (BuildContext context, int index) {
return SizedBox(
height: 128,
child: Card(
color: destination.color[shades[index]].withOpacity(0.25),
child: InkWell(
onTap: () {
Navigator.pushNamed(context, "/text");
},
child: Center(
child: Text('Item $index', style: Theme.of(context).primaryTextTheme.display1),
),
),
),
);
},
),
),
);
}
}
class TextPage extends StatefulWidget {
const TextPage({ Key key, this.destination }) : super(key: key);
final Destination destination;
@override
_TextPageState createState() => _TextPageState();
}
class _TextPageState extends State<TextPage> {
TextEditingController _textController;
@override
void initState() {
super.initState();
_textController = TextEditingController(
text: 'sample text: ${widget.destination.title}',
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.destination.title),
backgroundColor: widget.destination.color,
),
backgroundColor: widget.destination.color[50],
body: Container(
padding: const EdgeInsets.all(32.0),
alignment: Alignment.center,
child: TextField(controller: _textController),
),
);
}
@override
void dispose() {
_textController.dispose();
super.dispose();
}
}
class DestinationView extends StatefulWidget {
const DestinationView({ Key key, this.destination }) : super(key: key);
final Destination destination;
@override
_DestinationViewState createState() => _DestinationViewState();
}
class _DestinationViewState extends State<DestinationView> {
@override
Widget build(BuildContext context) {
return Navigator(
onGenerateRoute: (RouteSettings settings) {
return MaterialPageRoute(
settings: settings,
builder: (BuildContext context) {
switch(settings.name) {
case '/':
return RootPage(destination: widget.destination);
case '/list':
return ListPage(destination: widget.destination);
case '/text':
return TextPage(destination: widget.destination);
}
},
);
},
);
}
}
class HomePage extends StatefulWidget {
@override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> with TickerProviderStateMixin<HomePage> {
List<Key> _destinationKeys;
List<AnimationController> _faders;
int _currentIndex = 0;
@override
void initState() {
super.initState();
_faders = allDestinations.map<AnimationController>((Destination destination) {
return AnimationController(vsync: this, duration: Duration(milliseconds: 200));
}).toList();
_faders[_currentIndex].value = 1.0;
_destinationKeys = List<Key>.generate(allDestinations.length, (int index) => GlobalKey()).toList();
}
@override
void dispose() {
for (AnimationController controller in _faders)
controller.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: SafeArea(
top: false,
child: Stack(
fit: StackFit.expand,
children: allDestinations.map((Destination destination) {
final Widget view = FadeTransition(
opacity: _faders[destination.index].drive(CurveTween(curve: Curves.fastOutSlowIn)),
child: KeyedSubtree(
key: _destinationKeys[destination.index],
child: DestinationView(
destination: destination,
),
),
);
if (destination.index == _currentIndex) {
_faders[destination.index].forward();
return view;
} else {
_faders[destination.index].reverse();
if (_faders[destination.index].isAnimating) {
return IgnorePointer(child: view);
}
return Offstage(child: view);
}
}).toList(),
),
),
bottomNavigationBar: BottomNavigationBar(
currentIndex: _currentIndex,
onTap: (int index) {
setState(() {
_currentIndex = index;
});
},
items: allDestinations.map((Destination destination) {
return BottomNavigationBarItem(
icon: Icon(destination.icon),
backgroundColor: destination.color,
title: Text(destination.title)
);
}).toList(),
),
);
}
}
void main() {
runApp(MaterialApp(home: HomePage()));
}
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