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lib/widgets/navigation_scaffold/components/fladder_appbar.dart

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+import 'package:fladder/screens/shared/default_titlebar.dart';
+import 'package:fladder/util/adaptive_layout.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:go_router/go_router.dart';
+
+bool get _isDesktop {
+  if (kIsWeb) return false;
+  return [
+    TargetPlatform.windows,
+    TargetPlatform.linux,
+    TargetPlatform.macOS,
+  ].contains(defaultTargetPlatform);
+}
+
+class FladderAppbar extends StatelessWidget implements PreferredSize {
+  final double height;
+  final String? label;
+  final bool automaticallyImplyLeading;
+  const FladderAppbar({this.height = 35, this.automaticallyImplyLeading = false, this.label, super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    if (AdaptiveLayout.of(context).isDesktop) {
+      return PreferredSize(
+          preferredSize: Size(double.infinity, height),
+          child: SizedBox(
+            height: height,
+            child: Row(
+              children: [
+                if (automaticallyImplyLeading && context.canPop()) BackButton(),
+                Expanded(
+                  child: DefaultTitleBar(
+                    label: label,
+                  ),
+                )
+              ],
+            ),
+          ));
+    } else {
+      return AppBar(
+        toolbarHeight: 0,
+        backgroundColor: Theme.of(context).colorScheme.surface.withOpacity(0),
+        scrolledUnderElevation: 0,
+        elevation: 0,
+        systemOverlayStyle: SystemUiOverlayStyle(),
+        title: const Text(""),
+        automaticallyImplyLeading: automaticallyImplyLeading,
+      );
+    }
+  }
+
+  @override
+  Widget get child => Container();
+
+  @override
+  Size get preferredSize => Size(double.infinity, _isDesktop ? height : 0);
+}