fix: maximized window optimization (AppFlowy-IO#5622)

Author: Xazin

frontend/appflowy_flutter/lib/core/config/kv_keys.dart

@@ -18,6 +18,13 @@ class KVKeys {
   ///   {'dx': 10.0, 'dy': 10.0}
   static const String windowPosition = 'windowPosition';
 
+  /// The key for saving the window status
+  ///
+  /// The value is a json string with the following format:
+  ///  { 'windowMaximized': true }
+  ///
+  static const String windowMaximized = 'windowMaximized';
+
   static const String kDocumentAppearanceFontSize =
       'kDocumentAppearanceFontSize';
   static const String kDocumentAppearanceFontFamily =

frontend/appflowy_flutter/lib/startup/tasks/app_window_size_manager.dart

@@ -83,4 +83,19 @@ class WindowSizeManager {
       '${scaleFactor.clamp(minScaleFactor, maxScaleFactor)}',
     );
   }
+
+  /// Set the window maximized status
+  Future<void> setWindowMaximized(bool isMaximized) async {
+    await getIt<KeyValueStorage>()
+        .set(KVKeys.windowMaximized, isMaximized.toString());
+  }
+
+  /// Get the window maximized status
+  Future<bool> getWindowMaximized() async {
+    return await getIt<KeyValueStorage>().getWithFormat<bool>(
+          KVKeys.windowMaximized,
+          (v) => bool.tryParse(v) ?? false,
+        ) ??
+        false;
+  }
 }

frontend/appflowy_flutter/lib/startup/tasks/windows.dart

@@ -13,12 +13,9 @@ import 'package:scaled_app/scaled_app.dart';
 import 'package:window_manager/window_manager.dart';
 
 class InitAppWindowTask extends LaunchTask with WindowListener {
-  InitAppWindowTask({
-    this.title = 'AppFlowy',
-  });
+  InitAppWindowTask({this.title = 'AppFlowy'});
 
   final String title;
-
   final windowSizeManager = WindowSizeManager();
 
   @override
@@ -48,7 +45,7 @@ class InitAppWindowTask extends LaunchTask with WindowListener {
     final position = await windowSizeManager.getPosition();
 
     if (PlatformExtension.isWindows) {
-      doWhenWindowReady(() {
+      doWhenWindowReady(() async {
         appWindow.minSize = windowOptions.minimumSize;
         appWindow.maxSize = windowOptions.maximumSize;
         appWindow.size = windowSize;
@@ -58,6 +55,13 @@ class InitAppWindowTask extends LaunchTask with WindowListener {
         }
 
         appWindow.show();
+
+        /// on Windows we maximize the window if it was previously closed
+        /// from a maximized state.
+        final isMaximized = await windowSizeManager.getWindowMaximized();
+        if (isMaximized) {
+          appWindow.maximize();
+        }
       });
     } else {
       await windowManager.waitUntilReadyToShow(windowOptions, () async {
@@ -78,16 +82,20 @@ class InitAppWindowTask extends LaunchTask with WindowListener {
   }
 
   @override
-  Future<void> onWindowResize() async {
-    super.onWindowResize();
+  Future<void> onWindowMaximize() async {
+    super.onWindowMaximize();
+    await windowSizeManager.setWindowMaximized(true);
+  }
 
-    final currentWindowSize = await windowManager.getSize();
-    return windowSizeManager.setSize(currentWindowSize);
+  @override
+  Future<void> onWindowUnmaximize() async {
+    super.onWindowUnmaximize();
+    await windowSizeManager.setWindowMaximized(false);
   }
 
   @override
-  void onWindowMaximize() async {
-    super.onWindowMaximize();
+  Future<void> onWindowResize() async {
+    super.onWindowResize();
 
     final currentWindowSize = await windowManager.getSize();
     return windowSizeManager.setSize(currentWindowSize);