49 lines
1.5 KiB
Dart
49 lines
1.5 KiB
Dart
// Copyright 2020 Ben Hills and the project contributors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/material.dart';
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import 'package:flutter/widgets.dart';
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/// This class will observe the current route.
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///
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/// This gives us an easy way to tell what screen we are on from elsewhere within
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/// the application. This is useful, for example, when responding to external links
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/// and determining if we need to display the podcast details or just update the
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/// current screen.
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class NavigationRouteObserver extends NavigatorObserver {
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final List<Route<dynamic>?> _routeStack = <Route<dynamic>?>[];
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static final NavigationRouteObserver _instance = NavigationRouteObserver._internal();
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NavigationRouteObserver._internal();
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factory NavigationRouteObserver() {
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return _instance;
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}
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@override
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void didPop(Route<dynamic> route, Route<dynamic>? previousRoute) {
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_routeStack.removeLast();
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}
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@override
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void didPush(Route<dynamic> route, Route<dynamic>? previousRoute) {
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_routeStack.add(route);
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}
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@override
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void didRemove(Route<dynamic> route, Route<dynamic>? previousRoute) {
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_routeStack.remove(route);
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}
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@override
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void didReplace({Route<dynamic>? newRoute, Route<dynamic>? oldRoute}) {
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int oldRouteIndex = _routeStack.indexOf(oldRoute);
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_routeStack.replaceRange(oldRouteIndex, oldRouteIndex + 1, [newRoute]);
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}
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Route<dynamic>? get top => _routeStack.last;
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}
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