ADD appBarBreakpoint (#4434)

Thsi PR add the ability to display an AppBar on any desired Breakpoint.  It can be usefull to display an AppBar even on a desktop application. 

related to : flutter/flutter#130117

packages/flutter_adaptive_scaffold/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.1.6
+
+* Added support for displaying an AppBar on any Breakpoint by introducing appBarBreakpoint
+
 ## 0.1.5
 
 * Added support for Right-to-left (RTL) directionality.

packages/flutter_adaptive_scaffold/lib/src/adaptive_scaffold.dart

@@ -101,6 +101,7 @@ class AdaptiveScaffold extends StatefulWidget {
     this.appBar,
     this.navigationRailWidth = 72,
     this.extendedNavigationRailWidth = 192,
+    this.appBarBreakpoint,
   });
 
   /// The destinations to be used in navigation items. These are converted to
@@ -215,6 +216,13 @@ class AdaptiveScaffold extends StatefulWidget {
   /// Defaults to [Breakpoints.smallDesktop].
   final Breakpoint drawerBreakpoint;
 
+  /// An optional [Breakpoint] which overrides the [appBar] breakpoint to display
+  /// an [AppBar] without depending on the drawer visibility.
+  ///
+  /// By default, an [AppBar] will show on [Breakpoints.smallDesktop] if [useDrawer] is set
+  /// to true.
+  final Breakpoint? appBarBreakpoint;
+
   /// Option to override the default [AppBar] when using drawer in desktop
   /// small.
   final PreferredSizeWidget? appBar;
@@ -489,7 +497,8 @@ class _AdaptiveScaffoldState extends State<AdaptiveScaffold> {
         Theme.of(context).navigationRailTheme;
 
     return Scaffold(
-      appBar: widget.drawerBreakpoint.isActive(context) && widget.useDrawer
+      appBar: widget.drawerBreakpoint.isActive(context) && widget.useDrawer ||
+              (widget.appBarBreakpoint?.isActive(context) ?? false)
           ? widget.appBar ?? AppBar()
           : null,
       drawer: widget.drawerBreakpoint.isActive(context) && widget.useDrawer

packages/flutter_adaptive_scaffold/pubspec.yaml

@@ -1,6 +1,6 @@
 name: flutter_adaptive_scaffold
 description: Widgets to easily build adaptive layouts, including navigation elements.
-version: 0.1.5
+version: 0.1.6
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+flutter_adaptive_scaffold%22
 repository: https://github.com/flutter/packages/tree/main/packages/flutter_adaptive_scaffold
 

packages/flutter_adaptive_scaffold/test/adaptive_scaffold_test.dart

@@ -580,6 +580,29 @@ void main() {
       expect(dir, TextDirection.rtl);
     },
   );
+
+  testWidgets(
+    'when appBarBreakpoint is provided validate an AppBar is showing without Drawer on larger than mobile',
+    (WidgetTester tester) async {
+      await tester.binding.setSurfaceSize(SimulatedLayout.medium.size);
+      await tester.pumpWidget(SimulatedLayout.medium
+          .app(appBarBreakpoint: AppBarAlwaysOnBreakpoint()));
+      await tester.pumpAndSettle();
+
+      final Finder appBar = find.byType(AppBar);
+      final Finder drawer = find.byType(Drawer);
+      expect(appBar, findsOneWidget);
+      expect(drawer, findsNothing);
+
+      await tester.binding.setSurfaceSize(SimulatedLayout.large.size);
+      await tester.pumpWidget(SimulatedLayout.large
+          .app(appBarBreakpoint: AppBarAlwaysOnBreakpoint()));
+      expect(drawer, findsNothing);
+      await tester.pumpAndSettle();
+
+      expect(appBar, findsOneWidget);
+    },
+  );
 }
 
 /// An empty widget that implements [PreferredSizeWidget] to ensure that

packages/flutter_adaptive_scaffold/test/simulated_layout.dart

@@ -34,10 +34,12 @@ class TestScaffold extends StatefulWidget {
     super.key,
     this.initialIndex = 0,
     this.isAnimated = true,
+    this.appBarBreakpoint,
   });
 
   final int? initialIndex;
   final bool isAnimated;
+  final Breakpoint? appBarBreakpoint;
 
   static const List<NavigationDestination> destinations =
       <NavigationDestination>[
@@ -75,6 +77,7 @@ class TestScaffoldState extends State<TestScaffold> {
         });
       },
       drawerBreakpoint: NeverOnBreakpoint(),
+      appBarBreakpoint: widget.appBarBreakpoint,
       internalAnimations: widget.isAnimated,
       smallBreakpoint: TestBreakpoint0(),
       mediumBreakpoint: TestBreakpoint800(),
@@ -122,6 +125,7 @@ enum SimulatedLayout {
   MaterialApp app({
     int? initialIndex,
     bool animations = true,
+    Breakpoint? appBarBreakpoint,
   }) {
     return MaterialApp(
       theme: ThemeData.light().copyWith(
@@ -136,6 +140,7 @@ enum SimulatedLayout {
         child: TestScaffold(
           initialIndex: initialIndex,
           isAnimated: animations,
+          appBarBreakpoint: appBarBreakpoint,
         ),
       ),
     );

packages/flutter_adaptive_scaffold/test/test_breakpoints.dart

@@ -41,3 +41,10 @@ class NeverOnBreakpoint extends Breakpoint {
     return false;
   }
 }
+
+class AppBarAlwaysOnBreakpoint extends Breakpoint {
+  @override
+  bool isActive(BuildContext context) {
+    return true;
+  }
+}