refactor: use window_manager for close handling on Linux

A fix was merged that makes it work on Linux.

See: leanflutter/window_manager#343

lib/app.dart

@@ -36,8 +36,6 @@ class _AppState extends State<App> with TrayListener, WindowListener {
 
   @override
   void onWindowClose() {
-    /// Only working on Windows for some reason.
-    /// Linux will use `flutter_window_close` instead.
     if (settingsCubit.state.closeToTray) {
       AppWindow.instance.hide();
       return;

lib/main.dart

@@ -59,10 +59,11 @@ Future<void> main(List<String> args) async {
     exit(0);
   } else {}
 
-  final appWindow = AppWindow(storage);
-
   final hotkeyService = HotkeyService(activeWindow);
 
+  final appWindow = AppWindow(storage);
+  appWindow.initialize();
+
   final settingsCubit = await SettingsCubit.init(
     autostartService: AutostartService(),
     hotkeyService: hotkeyService,
@@ -107,8 +108,4 @@ Future<void> main(List<String> args) async {
       child: const App(),
     ),
   );
-
-  final bool? startHiddenInTray = await storage.getValue('startHiddenInTray');
-
-  if (startHiddenInTray != true) await appWindow.show();
 }

lib/window/app_window.dart

@@ -1,12 +1,10 @@
 import 'dart:io';
 import 'dart:ui';
 
-import 'package:flutter_window_close/flutter_window_close.dart';
 import 'package:window_manager/window_manager.dart';
 
 import '../core/helpers/json_converters.dart';
 import '../logs/logs.dart';
-import '../settings/settings.dart';
 import '../storage/storage_repository.dart';
 
 /// Represents the main window of the app.
@@ -17,23 +15,16 @@ class AppWindow {
 
   AppWindow(this._storage) {
     instance = this;
-    _listenForWindowClose();
   }
 
-  void _listenForWindowClose() {
-    if (!Platform.isLinux) return;
+  void initialize() {
+    windowManager.waitUntilReadyToShow().then((_) async {
+      final bool? startHiddenInTray =
+          await _storage.getValue('startHiddenInTray');
 
-    /// For now using `flutter_window_close` on Linux, because the
-    /// `onWindowClose` from `window_manager` is only working on Windows for
-    /// some reason. Probably best to switch to only using `window_manager` if
-    /// it starts also working on Linux in the future.
-    FlutterWindowClose.setWindowShouldCloseHandler(() async {
-      await hide();
-      final shouldExitProgram = (settingsCubit.state.closeToTray) //
-          ? false
-          : true;
-
-      return shouldExitProgram;
+      if (startHiddenInTray != true) {
+        await show();
+      }
     });
   }
 

pubspec.lock

@@ -293,10 +293,10 @@ packages:
     dependency: "direct main"
     description:
       name: flutter_markdown
-      sha256: "9e0202b5339cd88ac0f109abae8502681bfab0b13a8e02a0e7158124610b5d98"
+      sha256: "86b76dbf30496024d6c816bdc13b97de9449dce1f035a73ee7b4ab7f67eab70b"
       url: "https://pub.dev"
     source: hosted
-    version: "0.6.15+1"
+    version: "0.6.16"
   flutter_svg:
     dependency: transitive
     description:
@@ -315,14 +315,6 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
-  flutter_window_close:
-    dependency: "direct main"
-    description:
-      name: flutter_window_close
-      sha256: "63f5846efbf0974ec233e6b5f468aa604a4857157f4c6c44fd482621804a0464"
-      url: "https://pub.dev"
-    source: hosted
-    version: "0.2.2"
   freezed:
     dependency: "direct dev"
     description:
@@ -1152,10 +1144,10 @@ packages:
     dependency: "direct main"
     description:
       name: window_manager
-      sha256: "95096fede562cbb65f30d38b62d819a458f59ba9fe4a317f6cee669710f6676b"
+      sha256: "9eef00e393e7f9308309ce9a8b2398c9ee3ca78b50c96e8b4f9873945693ac88"
       url: "https://pub.dev"
     source: hosted
-    version: "0.3.4"
+    version: "0.3.5"
   window_size:
     dependency: "direct main"
     description:

pubspec.yaml

@@ -16,7 +16,6 @@ dependencies:
   flutter_localizations:
     sdk: flutter
   flutter_markdown: ^0.6.9+1
-  flutter_window_close: ^0.2.2
   freezed_annotation: ^2.2.0
   helpers:
     git:
@@ -43,7 +42,7 @@ dependencies:
   url_launcher: ^6.0.4
   win32: ^5.0.5
   win32_suspend_process: ^1.1.0
-  window_manager: ^0.3.0
+  window_manager: ^0.3.5
   window_size:
     git:
       url: https://github.com/google/flutter-desktop-embedding.git