adding builder for single route item

example/android/build.gradle

@@ -26,6 +26,6 @@ subprojects {
     project.evaluationDependsOn(':app')
 }
 
-task clean(type: Delete) {
+tasks.register("clean", Delete) {
     delete rootProject.buildDir
 }

lib/bart/bart_model.dart

@@ -11,9 +11,14 @@ typedef BartPageBuilder = Widget Function(
   RouteSettings? settings,
 );
 
+typedef IconBuilder = Widget Function(
+  BuildContext context,
+);
+
 class BartMenuRoute {
   String? label;
   IconData? icon;
+  IconBuilder? iconBuilder;
 
   /// The optional [IconData] that's displayed when this
   /// [NavigationDestination] is selected.
@@ -32,6 +37,7 @@ class BartMenuRoute {
   BartMenuRoute._({
     this.label,
     this.icon,
+    this.iconBuilder,
     this.selectedIcon,
     required this.path,
     required this.pageBuilder,
@@ -43,7 +49,16 @@ class BartMenuRoute {
     this.maintainState,
     this.transitionsBuilder,
     this.transitionDuration,
-  });
+  }) {
+    assert(
+      icon != null || iconBuilder != null,
+      "You must provide an icon or an iconWidget",
+    );
+    assert(
+      icon == null || iconBuilder == null,
+      "You can't provide both an icon and an iconWidget",
+    );
+  }
 
   factory BartMenuRoute.bottomBar({
     required String label,
@@ -69,6 +84,30 @@ class BartMenuRoute {
         showBottomBar: true,
       );
 
+  factory BartMenuRoute.bottomBarBuilder({
+    required String? label,
+    required IconBuilder builder,
+    required String path,
+    required BartPageBuilder pageBuilder,
+    RouteTransitionsBuilder? transitionsBuilder,
+    Duration? transitionDuration,
+    bool cache = true,
+    IconData? selectedIcon,
+  }) =>
+      BartMenuRoute._(
+        label: label,
+        iconBuilder: builder,
+        path: path,
+        cache: cache,
+        type: BartMenuRouteType.bottomNavigation,
+        pageBuilder: pageBuilder,
+        settings: RouteSettings(name: path),
+        transitionsBuilder: transitionsBuilder,
+        transitionDuration: transitionDuration,
+        selectedIcon: selectedIcon,
+        showBottomBar: true,
+      );
+
   factory BartMenuRoute.innerRoute({
     required String path,
     required BartPageBuilder pageBuilder,

lib/bart/widgets/bottom_bar/styles/bottom_bar_cupertino.dart

@@ -20,7 +20,7 @@ class BartCupertinoBottomBar extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return CupertinoTabBar(
-      items: routeWidgetList,
+      items: getRouteWidgetList(context),
       currentIndex: currentIndex,
       iconSize: theme.iconSize,
       border: theme.border,
@@ -32,10 +32,23 @@ class BartCupertinoBottomBar extends StatelessWidget {
     );
   }
 
-  List<BottomNavigationBarItem> get routeWidgetList => routes
-      .map((route) => BottomNavigationBarItem(
-            icon: Icon(route.icon),
-            label: route.label,
-          ))
-      .toList();
+  List<BottomNavigationBarItem> getRouteWidgetList(BuildContext context) =>
+      routes.map(
+        (route) {
+          if (route.icon != null) {
+            return BottomNavigationBarItem(
+              icon: Icon(route.icon),
+              label: route.label,
+            );
+          } else if (route.iconBuilder != null) {
+            return BottomNavigationBarItem(
+              icon: route.iconBuilder!(context),
+              label: route.label,
+            );
+          }
+          throw Exception(
+            "You must provide an icon or an iconBuilder for each route",
+          );
+        },
+      ).toList();
 }

lib/bart/widgets/bottom_bar/styles/bottom_bar_material.dart

@@ -63,7 +63,7 @@ class BartMaterial3BottomBar extends StatelessWidget {
   Widget build(BuildContext context) {
     return NavigationBar(
       selectedIndex: currentIndex,
-      destinations: routeWidgetList,
+      destinations: getRouteWidgetList(context),
       elevation: theme.elevation,
       backgroundColor: theme.bgColor,
       height: theme.height,
@@ -73,13 +73,30 @@ class BartMaterial3BottomBar extends StatelessWidget {
     );
   }
 
-  List<NavigationDestination> get routeWidgetList => routes
-      .where((element) => element.type == BartMenuRouteType.bottomNavigation)
-      .map((route) => NavigationDestination(
-            icon: Icon(route.icon),
-            label: route.label ?? '',
-            selectedIcon:
-                route.selectedIcon != null ? Icon(route.selectedIcon) : null,
-          ))
-      .toList();
+  List<NavigationDestination> getRouteWidgetList(BuildContext context) => routes
+          .where(
+              (element) => element.type == BartMenuRouteType.bottomNavigation)
+          .map(
+        (route) {
+          if (route.icon != null) {
+            return NavigationDestination(
+              icon: Icon(route.icon),
+              label: route.label ?? '',
+              selectedIcon:
+                  route.selectedIcon != null ? Icon(route.selectedIcon) : null,
+            );
+          } else if (route.iconBuilder != null) {
+            return NavigationDestination(
+              icon: route.iconBuilder!(context),
+              label: route.label ?? '',
+              // selectedIcon: route.selectedIconBuilder != null
+              //     ? route.selectedIconBuilder!(context)
+              //     : null,
+            );
+          }
+          throw Exception(
+            "You must provide an icon or an iconBuilder for each route",
+          );
+        },
+      ).toList();
 }

lib/bart/widgets/nested_navigator.dart

@@ -43,7 +43,7 @@ class _NestedNavigatorState extends State<NestedNavigator>
       child: Navigator(
         key: widget.navigationKey,
         initialRoute: widget.initialRoute,
-        observers: [routeObserver],
+        // observers: [routeObserver],
         onGenerateRoute: (RouteSettings routeSettings) {
           Actions.invoke(context, AppBarBuildIntent.empty());
           hideAppBar(context);
@@ -101,15 +101,15 @@ class _NestedNavigatorState extends State<NestedNavigator>
         },
       ),
       onWillPop: () {
-        // showBottomBar(context);
+        showBottomBar(context);
         if (widget.onWillPop != null) {
           widget.onWillPop!();
         }
-        if (widget.navigationKey.currentState!.canPop()) {
+        if (widget.navigationKey.currentState != null &&
+            widget.navigationKey.currentState!.canPop()) {
           widget.navigationKey.currentState!.pop();
-          return Future<bool>.value(false);
         }
-        return Future<bool>.value(true);
+        return Future<bool>.value(false);
       },
     );
   }