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import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:flutter_homescreen/homescreen_model.dart';
import 'package:flutter_homescreen/page_dashboard.dart';
import 'package:flutter_homescreen/page_home.dart';
import 'package:flutter_homescreen/page_hvac.dart';
import 'package:flutter_homescreen/page_media.dart';
import 'package:flutter_homescreen/widget_clock.dart';
enum PageIndex { home, dashboard, hvac, media, demo3d }
class Homescreen extends StatefulWidget {
Homescreen({Key? key}) : super(key: key);
@override
_HomescreenState createState() => _HomescreenState();
}
class _HomescreenState extends State<Homescreen> with TickerProviderStateMixin {
int _selectedIndex = 0;
int _previousIndex = 0;
setNavigationIndex(int index) {
setState(() {
_previousIndex = _selectedIndex;
_selectedIndex = index;
});
}
Widget _childForIndex(int selectedIndex) {
switch (PageIndex.values[selectedIndex]) {
case PageIndex.home:
return HomePage(
key: ValueKey(selectedIndex),
onSetNavigationIndex: setNavigationIndex);
case PageIndex.dashboard:
return DashboardPage(key: ValueKey(selectedIndex));
case PageIndex.hvac:
return HVACPage(key: ValueKey(selectedIndex));
case PageIndex.media:
return MediaPage(key: ValueKey(selectedIndex));
case PageIndex.demo3d:
return Text('3D demo');
default:
return Text('Undefined');
}
}
@override
Widget build(BuildContext context) {
return Container(
color: Colors.deepPurple.shade50,
child: Center(
child: LayoutBuilder(
builder: _buildLayout,
)));
}
Widget _buildLayout(BuildContext context, BoxConstraints constraints) {
// size the icons so they cover the left edge of the screen
var iconSize = constraints.maxHeight / (PageIndex.values.length + 2);
var railSize = constraints.maxHeight / (PageIndex.values.length + 1);
return Scaffold(
body: Row(
children: <Widget>[
Container(
decoration: BoxDecoration(
gradient: LinearGradient(
begin: Alignment.centerLeft,
end: Alignment.centerRight,
colors: [
Colors.blueGrey.shade800,
Colors.blueGrey.shade900
])),
child: Stack(
children: [
NavigationRail(
backgroundColor: Colors.transparent,
selectedIndex: _selectedIndex,
groupAlignment: -1.0,
minWidth: railSize,
// leading widget?
// leading: Icon(Icons.house_outlined, size: iconSize),
// trailing widget does not expand to bottom
onDestinationSelected: (int index) {
setNavigationIndex(index);
},
selectedIconTheme: IconTheme.of(context).copyWith(
size: iconSize,
color: Colors.orangeAccent.shade100,
),
unselectedIconTheme: IconTheme.of(context).copyWith(
size: iconSize,
color: Colors.blueGrey.shade400,
),
labelType: NavigationRailLabelType.none,
destinations: <NavigationRailDestination>[
NavigationRailDestination(
icon: Icon(Icons.house),
selectedIcon: Icon(Icons.house),
label: Text('Home'),
),
NavigationRailDestination(
icon: Icon(Icons.drive_eta),
selectedIcon: Icon(Icons.drive_eta),
label: Text('Dashboard'),
),
NavigationRailDestination(
icon: Icon(Icons.thermostat),
selectedIcon: Icon(Icons.thermostat),
label: Text('HVAC'),
),
NavigationRailDestination(
icon: Icon(Icons.music_note),
selectedIcon: Icon(Icons.music_note),
label: Text('Media'),
),
NavigationRailDestination(
icon: Icon(Icons.view_in_ar),
selectedIcon: Icon(Icons.view_in_ar),
label: Text('3D example'),
),
],
),
Positioned(
bottom: 0,
left: 0,
right: 0,
// This is the info widget with time, date, etc.
child: ClockWiddget(
size: railSize,
textColor: Colors.blueGrey.shade100,
),
)
],
),
),
VerticalDivider(
thickness: 1,
width: 1,
color: Colors.grey.shade900,
),
// This is the main content.
Expanded(
child: ChangeNotifierProvider(
// See: https://docs.flutter.dev/development/data-and-backend/state-mgmt/simple
// Also: https://docs.flutter.dev/development/data-and-backend/state-mgmt/options
create: (context) => HomescreenModel(),
child: AnimatedSwitcher(
duration: const Duration(milliseconds: 500),
reverseDuration: const Duration(milliseconds: 500),
switchInCurve: Curves.easeInOut,
switchOutCurve: Curves.easeInOut,
transitionBuilder: (Widget child, Animation<double> animation) {
if (child.key != ValueKey(_selectedIndex)) {
return FadeTransition(
opacity: Tween<double>(begin: 1.0, end: 1.0)
.animate(animation),
child: child,
);
}
Offset beginOffset = new Offset(
0.0, (_selectedIndex > _previousIndex ? 1.0 : -1.0));
return SlideTransition(
position:
Tween<Offset>(begin: beginOffset, end: Offset.zero)
.animate(animation),
child: FadeTransition(
opacity: Tween<double>(begin: 0.0, end: 1.0).animate(
CurvedAnimation(
parent: animation,
curve: Interval(0.5, 1.0),
),
),
child: child,
),
);
},
child: _childForIndex(_selectedIndex),
),
),
),
],
),
);
}
}
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