fix(mac): properly handle system initiated quit events

src/lib/gui/MainWindow.cpp

@@ -163,6 +163,11 @@ MainWindow::MainWindow()
   applyConfig();
   m_statusBar->setSecurityIcon(TlsUtility::isEnabled());
   restoreWindow();
+
+#ifdef Q_OS_MACOS
+  // Route native quits (Cmd+Q / Apple menu Quit / Dock "Quit") to the usual close-to-tray decision instead.
+  installQuitHandler([this] { return !maybeHideToTray(); });
+#endif
 }
 MainWindow::~MainWindow()
 {
@@ -898,16 +903,25 @@ void MainWindow::handlePeerFingerprint(const QString &fingerprint)
   }
 }
 
+bool MainWindow::maybeHideToTray()
+{
+  if (!Settings::value(Settings::Gui::CloseToTray).toBool()) {
+    return false;
+  }
+
+  if (Settings::value(Settings::Gui::CloseReminder).toBool()) {
+    messages::showCloseReminder(this);
+    Settings::setValue(Settings::Gui::CloseReminder, false);
+  }
+  Settings::setValue(Settings::Gui::WindowGeometry, geometry());
+  qDebug() << "hiding to tray";
+  hide();
+  return true;
+}
+
 void MainWindow::closeEvent(QCloseEvent *event)
 {
-  if (Settings::value(Settings::Gui::CloseToTray).toBool() && event->spontaneous()) {
+  if (event->spontaneous() && maybeHideToTray()) {
-    if (Settings::value(Settings::Gui::CloseReminder).toBool()) {
-      messages::showCloseReminder(this);
-      Settings::setValue(Settings::Gui::CloseReminder, false);
-    }
-    Settings::setValue(Settings::Gui::WindowGeometry, geometry());
-    qDebug() << "hiding to tray";
-    hide();
     event->ignore();
     return;
   }

src/lib/gui/MainWindow.h

@@ -122,6 +122,7 @@ private:
   void handlePeerFingerprint(const QString &fingerprint);
   void handleMissingKeyboardLayouts(const QString &layouts);
   void closeEvent(QCloseEvent *event) override;
+  bool maybeHideToTray();
   void secureSocket(bool secureSocket);
   void connectSlots();
   void handleLogLine(const QString &line);

src/lib/gui/OSXHelpers.h

@@ -8,9 +8,12 @@
 
 #include <QString>
 
+#include <functional>
+
 void requestOSXNotificationPermission();
 bool isOSXDevelopmentBuild();
 bool showOSXNotification(const QString &title, const QString &body);
 bool isOSXInterfaceStyleDark();
 void forceAppActive();
 void macOSNativeHide();
+void installQuitHandler(std::function<bool()> shouldQuit);

src/lib/gui/OSXHelpers.mm

@@ -13,12 +13,19 @@
 #import <UserNotifications/UNNotificationContent.h>
 #import <UserNotifications/UNNotificationTrigger.h>
 #import <UserNotifications/UNUserNotificationCenter.h>
+#import <objc/runtime.h>
 
 #import <QtGlobal>
 
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wdeprecated-declarations"
 
+namespace {
+std::function<bool()> s_shouldQuit;
+IMP s_originalShouldTerminate = nullptr;
+BOOL s_isSystemShuttingDown = NO;
+} // namespace
+
 void requestOSXNotificationPermission()
 {
 #if OSX_DEPLOYMENT_TARGET >= 1014
@@ -107,3 +114,44 @@ void macOSNativeHide()
   [NSApp hide:nil];
   [[NSApplication sharedApplication] setActivationPolicy:NSApplicationActivationPolicyAccessory];
 }
+
+static NSApplicationTerminateReply deskflow_applicationShouldTerminate(id self, SEL _cmd, NSApplication *sender)
+{
+  // Don't intercept a system shutdown (or logoff/restart)
+  if (!s_isSystemShuttingDown && s_shouldQuit && !s_shouldQuit()) {
+    return NSTerminateCancel;
+  }
+
+  // Execute Qt's applicationShouldTerminate
+  if (s_originalShouldTerminate) {
+    using ShouldTerminateFn = NSApplicationTerminateReply (*)(id, SEL, NSApplication *);
+    return reinterpret_cast<ShouldTerminateFn>(s_originalShouldTerminate)(self, _cmd, sender);
+  }
+
+  return NSTerminateNow;
+}
+
+void installQuitHandler(std::function<bool()> shouldQuit)
+{
+  s_shouldQuit = std::move(shouldQuit);
+
+  Class cls = [[NSApp delegate] class];
+  SEL selector = @selector(applicationShouldTerminate:);
+
+  Method method = class_getInstanceMethod(cls, selector);
+  if (method) {
+    s_originalShouldTerminate = method_getImplementation(method);
+    method_setImplementation(method, (IMP)deskflow_applicationShouldTerminate);
+  } else {
+    class_addMethod(cls, selector, (IMP)deskflow_applicationShouldTerminate, "l@:@");
+  }
+
+  // shutdown is also triggered for logout/restart
+  [[[NSWorkspace sharedWorkspace] notificationCenter] addObserverForName:NSWorkspaceWillPowerOffNotification
+                                                                  object:nil
+                                                                   queue:[NSOperationQueue mainQueue]
+                                                              usingBlock:^(NSNotification *note) {
+                                                                Q_UNUSED(note)
+                                                                s_isSystemShuttingDown = YES;
+                                                              }];
+}