Automatically configure backButtonDispatcher

CHANGELOG.md

@@ -1,5 +1,9 @@
+# 0.1.2
+* Add `NestedBackButtonDispatcher` class
+* Automatically configure `backButtonDispatcher` based on widget tree (no manual configuration required anymore!)
+
 # 0.1.1+3
-* add static `attach()` and `attachNamed()` functions to `AdvancedNavigator` class
+* Add static `attach()` and `attachNamed()` functions to `AdvancedNavigator` class
 
 # 0.1.1+2
 * Fix: named path '/' not forwarding requests to nested navigators

example/pubspec.lock

@@ -7,7 +7,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "0.1.1+3"
+    version: "0.1.2"
   async:
     dependency: transitive
     description:

lib/src/advanced_navigator.dart

@@ -392,6 +392,7 @@ class AdvancedNavigatorState extends State<AdvancedNavigator>
 
   DefaultRouterDelegate _routerDelegate;
   RouteInformationProvider _informationProvider;
+  BackButtonDispatcher _backButtonDispatcher;
 
   Set<AdvancedNavigatorState> _children;
 
@@ -499,8 +500,8 @@ class AdvancedNavigatorState extends State<AdvancedNavigator>
     );
 
     // persist state on rebuild: == null
+    var ancestor = context.findAncestorStateOfType<AdvancedNavigatorState>();
     if (_informationProvider == null) {
-      var ancestor = context.findAncestorStateOfType<AdvancedNavigatorState>();
       var initialLocation = widget.initialLocation
           ?? AdvancedNavigator.defaultPathName;
       var initialRouteInformation = RouteInformation(
@@ -530,13 +531,30 @@ class AdvancedNavigatorState extends State<AdvancedNavigator>
         );
       }
     }
+    if (_backButtonDispatcher == null) {
+      var backButtonDispatcher = widget.backButtonDispatcher;
+      if (backButtonDispatcher == null) {
+        if (ancestor != null) {
+          var route = ModalRoute.of(context);
+          if (route != null) {
+            backButtonDispatcher = NestedBackButtonDispatcher(
+              ancestor._backButtonDispatcher,
+              route: route,
+            );
+          }
+        } else {
+          backButtonDispatcher = RootBackButtonDispatcher();
+        }
+      }
+      _backButtonDispatcher = backButtonDispatcher;
+    }
 
     return Router(
       key: _routerKey,
       routerDelegate: _routerDelegate,
       routeInformationProvider: _informationProvider,
       routeInformationParser: DefaultRouteInformationParser(),
-      backButtonDispatcher: widget.backButtonDispatcher ?? RootBackButtonDispatcher(),
+      backButtonDispatcher: _backButtonDispatcher,
     );
   }
 }

pubspec.yaml

@@ -1,6 +1,6 @@
 name: advanced_navigator
 description: Flutter's Navigator 2.0 as one easy-to-use widget with full page history manipulation operations, simplified pop event delegation and powerful nesting. 
-version: 0.1.1+3
+version: 0.1.2
 repository: https://github.com/LucasAschenbach/advanced_navigator
 
 environment: