opt.: backup & titlebar

lib/view/widget/appbar.dart

@@ -0,0 +1,95 @@
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+import 'package:window_manager/window_manager.dart';
+
+int? _titlebarHeight;
+bool _drawTitlebar = false;
+
+class CustomAppBar extends StatelessWidget implements PreferredSizeWidget {
+  const CustomAppBar({
+    super.key,
+    this.title,
+    this.actions,
+    this.centerTitle,
+    this.leading,
+    this.backgroundColor,
+  });
+
+  final Widget? title;
+  final List<Widget>? actions;
+  final bool? centerTitle;
+  final Widget? leading;
+  final Color? backgroundColor;
+
+  @override
+  Widget build(BuildContext context) {
+    final bar = AppBar(
+      key: key,
+      title: title,
+      actions: actions,
+      centerTitle: centerTitle,
+      leading: leading,
+      backgroundColor: backgroundColor,
+      toolbarHeight: (_titlebarHeight ?? 0) + kToolbarHeight,
+    );
+    if (!_drawTitlebar) return bar;
+    return Stack(
+      children: [
+        bar,
+        Positioned(
+          right: 0,
+          top: 0,
+          child: Row(
+            children: [
+              const SizedBox(width: 8),
+              IconButton(
+                icon: const Icon(Icons.minimize),
+                onPressed: () => windowManager.minimize(),
+              ),
+              const SizedBox(width: 8),
+              IconButton(
+                icon: const Icon(Icons.crop_square),
+                onPressed: () async {
+                  if (await windowManager.isMaximized()) {
+                    windowManager.unmaximize();
+                  } else {
+                    windowManager.maximize();
+                  }
+                },
+              ),
+              const SizedBox(width: 8),
+              IconButton(
+                icon: const Icon(Icons.close),
+                onPressed: () => windowManager.close(),
+              ),
+              const SizedBox(width: 8),
+            ],
+          ),
+        ),
+      ],
+    );
+  }
+
+  static Future<void> updateTitlebarHeight() async {
+    switch (Platform.operatingSystem) {
+      case 'macos':
+        final newTitlebarHeight = await windowManager.getTitleBarHeight();
+        if (_titlebarHeight != newTitlebarHeight) {
+          _titlebarHeight = newTitlebarHeight;
+        }
+        break;
+      // Draw a titlebar on Linux
+      case 'linux' || 'windows':
+        _titlebarHeight = 27;
+        _drawTitlebar = true;
+        break;
+      default:
+        break;
+    }
+  }
+
+  @override
+  Size get preferredSize =>
+      Size.fromHeight((_titlebarHeight ?? 0) + kToolbarHeight);
+}