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Created December 13, 2020 05:04
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import 'package:flutter/material.dart';
PageTypes _toPageType(String key) => PageTypes.values.firstWhere((v) => "$v" == key, orElse: () => null);
enum PageTypes {
Page1,
Page2,
Page3,
}
class AppInformationParser extends RouteInformationParser<NavModel> {
@override
Future<NavModel> parseRouteInformation(RouteInformation routeInformation) async {
NavModel result = NavModel();
// If we have some deeplink location, parse it
if (routeInformation.location != null) {
List<String> keys = routeInformation.location.split("/");
//Assume the first key is our page type, will fall back to null.
if (keys.length > 0) {
result.currentPage = _toPageType(keys[0]);
}
}
return result;
}
@override
RouteInformation restoreRouteInformation(NavModel model) {
return RouteInformation(location: "${model.currentPage ?? "/"}");
}
}
class AppRouterDelegate extends RouterDelegate<NavModel> with ChangeNotifier, PopNavigatorRouterDelegateMixin {
AppRouterDelegate(this.model) {
this.model.addListener(notifyListeners);
}
final NavModel model;
NavModel get currentConfiguration => model;
// Provide a global-key for the Navigator, allowing us to use the PopNavigatorRouterDelegateMixin
@override
GlobalKey<NavigatorState> get navigatorKey => _navigatorKey;
GlobalKey<NavigatorState> _navigatorKey = GlobalKey();
@override
Widget build(BuildContext context) {
return Scaffold(
body: Navigator(
key: _navigatorKey,
pages: model.currentPageStack(),
onPopPage: model.handlePopPage,
),
);
}
@override
Future<void> setNewRoutePath(NavModel model) async {
this.model.currentPage = model.currentPage;
}
}
class NavModel extends ChangeNotifier {
PageTypes _currentPage;
PageTypes get currentPage => _currentPage;
set currentPage(PageTypes value) {
_currentPage = value;
notifyListeners();
}
bool handlePopPage(Route<dynamic> route, dynamic result) {
bool result = false;
if (route.didPop(result)) {
currentPage = null;
result = true;
}
return result;
}
List<Page> currentPageStack() {
return [
MaterialPage(child: _Home(), key: ValueKey("Home")),
if (currentPage == PageTypes.Page1) ...{
MaterialPage(child: _Page1(), key: ValueKey(currentPage)),
} else if (currentPage == PageTypes.Page2) ...{
MaterialPage(child: _Page2(), key: ValueKey(currentPage)),
} else if (currentPage == PageTypes.Page3) ...{
MaterialPage(child: _Page3(), key: ValueKey(currentPage)),
},
];
}
}
NavModel _navModel = NavModel();
class NavStep2BasicRouter extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp.router(
routeInformationParser: AppInformationParser(),
routerDelegate: AppRouterDelegate(_navModel),
);
}
}
/// ///////////////////////////////////////////
/// VIEWS
class _Home extends StatelessWidget {
const _Home({Key key}) : super(key: key);
@override
Widget build(BuildContext context) => _MyScaffold(title: "HOME", page: Container());
}
class _Page1 extends StatelessWidget {
const _Page1({Key key}) : super(key: key);
@override
Widget build(BuildContext context) => _MyScaffold(title: "Page1", page: Container(color: Colors.red.shade200));
}
class _Page2 extends StatelessWidget {
const _Page2({Key key}) : super(key: key);
@override
Widget build(BuildContext context) => _MyScaffold(title: "Page2", page: Container(color: Colors.blue.shade200));
}
class _Page3 extends StatelessWidget {
const _Page3({Key key}) : super(key: key);
@override
Widget build(BuildContext context) => _MyScaffold(title: "Page3", page: Container(color: Colors.green.shade200));
}
class _MyScaffold extends StatelessWidget {
const _MyScaffold({Key key, this.title, this.page}) : super(key: key);
final String title;
final Widget page;
@override
Widget build(BuildContext context) {
bool showHome = _navModel.currentPage != null;
return Row(
children: [
Container(
padding: EdgeInsets.symmetric(horizontal: 40, vertical: 60),
color: Colors.grey.shade200,
child: Column(
children: [
FlatButton(child: Text("PAGE1"), onPressed: () => _navModel.currentPage = PageTypes.Page1),
FlatButton(child: Text("PAGE2"), onPressed: () => _navModel.currentPage = PageTypes.Page2),
FlatButton(child: Text("PAGE3"), onPressed: () => _navModel.currentPage = PageTypes.Page3),
],
),
),
Flexible(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(title, style: TextStyle(fontSize: 24)),
if (showHome) ...{
TextButton(
child: Text("HOME > ", style: TextStyle(color: Colors.blue)),
onPressed: () => _navModel.currentPage = null),
},
Flexible(child: page),
],
),
),
)
],
);
}
}
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