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tabbed_route.dart
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tabbed_route.dart
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import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
import 'cupertino.dart';
void main() {
runApp(const MyApp());
}
/// Sample app which uses the [GoTabbedRoute]
class MyApp extends StatefulWidget {
const MyApp({Key? key}) : super(key: key);
@override
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
/// A controller on [GoTabbedRoute], indicating the current index would be
/// useful
final GoTabbedRouteController tabbedRouteController = GoTabbedRouteController(
initialLocationBuilder: (context, index) => ['/red', '/green', '/blue'][index],
);
void _selectTabIndex(BuildContext context, int index) => tabbedRouteController.go(index);
@override
Widget build(BuildContext context) => MaterialApp.router(
routeInformationParser: _router.routeInformationParser,
routerDelegate: _router.routerDelegate,
title: 'GoRouter Example: Sub-routes',
);
late final _router = GoRouter(
initialLocation: '/red',
routes: [
GoTabbedRoute(
path: '/',
controller: tabbedRouteController,
routes: TabItem.values.map(_coloredRoute).toList(),
pageBuilder: (context, state, child) => MaterialPage<void>(
key: state.pageKey,
child: child,
),
navigatorBuilder: (context, child) => Scaffold(
body: child,
bottomNavigationBar: BottomNavigation(
currentTabIndex: tabbedRouteController.currentIndex,
onSelectTabIndex: _selectTabIndex,
),
),
),
],
errorPageBuilder: (context, state) => MaterialPage<void>(
key: state.pageKey,
child: ErrorPage(state.error),
),
);
GoRoute _coloredRoute(TabItem tabItem) => GoRoute(
path: tabName[tabItem]!,
pageBuilder: (context, state) => MaterialPage<void>(
key: state.pageKey,
child: Builder(
builder: (context) => ColorsListScreen(
color: activeTabColor[tabItem]!,
title: tabName[tabItem]!,
onPush: (materialIndex) {
context.go('/${tabName[tabItem]!}/details_$materialIndex');
},
)),
),
routes: [
GoRoute(
path: 'details_:materialIndex',
pageBuilder: (context, state) => MaterialPage<void>(
key: state.pageKey,
child: ColorDetailScreen(
color: activeTabColor[tabItem]!,
title: tabName[tabItem]!,
materialIndex: int.parse(state.params['materialIndex']!),
),
),
),
]);
}
class BottomNavigation extends StatelessWidget {
const BottomNavigation({
required this.currentTabIndex,
required this.onSelectTabIndex,
Key? key,
}) : super(key: key);
TabItem get _currentTab {
if (currentTabIndex == 0) {
return TabItem.red;
} else if (currentTabIndex == 1) {
return TabItem.green;
} else {
return TabItem.blue;
}
}
final int currentTabIndex;
final void Function(BuildContext context, int index) onSelectTabIndex;
@override
Widget build(BuildContext context) => BottomNavigationBar(
type: BottomNavigationBarType.fixed,
items: [
_buildItem(TabItem.red),
_buildItem(TabItem.green),
_buildItem(TabItem.blue),
],
onTap: (index) => onSelectTabIndex(context, index),
currentIndex: currentTabIndex,
selectedItemColor: activeTabColor[_currentTab],
);
BottomNavigationBarItem _buildItem(TabItem tabItem) => BottomNavigationBarItem(
icon: Icon(
Icons.layers,
color: _colorTabMatching(tabItem),
),
label: tabName[tabItem],
);
Color _colorTabMatching(TabItem item) =>
_currentTab == item ? activeTabColor[item]! : Colors.grey;
}
class ColorDetailScreen extends StatelessWidget {
const ColorDetailScreen({
required this.color,
required this.title,
Key? key,
this.materialIndex = 500,
}) : super(key: key);
final MaterialColor color;
final String title;
final int materialIndex;
@override
Widget build(BuildContext context) => Scaffold(
appBar: AppBar(
backgroundColor: color,
title: Text(
'$title[$materialIndex]',
),
),
body: Container(
color: color[materialIndex],
),
);
}
class ColorsListScreen extends StatelessWidget {
ColorsListScreen({
required this.color,
required this.title,
this.onPush,
Key? key,
}) : super(key: key);
final MaterialColor color;
final String title;
final ValueChanged<int>? onPush;
@override
Widget build(BuildContext context) => Scaffold(
appBar: AppBar(
title: Text(
title,
),
backgroundColor: color,
),
body: Container(
color: Colors.white,
child: _buildList(),
));
final List<int> materialIndices = [900, 800, 700, 600, 500, 400, 300, 200, 100, 50];
Widget _buildList() => ListView.builder(
itemCount: materialIndices.length,
itemBuilder: (content, index) {
final materialIndex = materialIndices[index];
return Container(
color: color[materialIndex],
child: ListTile(
title: Text('$materialIndex', style: const TextStyle(fontSize: 24)),
trailing: const Icon(Icons.chevron_right),
onTap: () => onPush?.call(materialIndex),
),
);
});
}
enum TabItem { red, green, blue }
const Map<TabItem, String> tabName = {
TabItem.red: 'red',
TabItem.green: 'green',
TabItem.blue: 'blue',
};
const Map<TabItem, MaterialColor> activeTabColor = {
TabItem.red: Colors.red,
TabItem.green: Colors.green,
TabItem.blue: Colors.blue,
};