Qt: Fix window close in nogui mode

src/duckstation-qt/displaywidget.cpp

@@ -162,6 +162,23 @@ void DisplayWidget::updateCursor(bool hidden)
   }
 }
 
+void DisplayWidget::handleCloseEvent(QCloseEvent* event)
+{
+  // Closing the separate widget will either cancel the close, or trigger shutdown.
+  // In the latter case, it's going to destroy us, so don't let Qt do it first.
+  if (QtHost::IsSystemValid())
+  {
+    QMetaObject::invokeMethod(g_main_window, "requestShutdown", Q_ARG(bool, true), Q_ARG(bool, true),
+                              Q_ARG(bool, false));
+  }
+  else
+  {
+    QMetaObject::invokeMethod(g_main_window, "requestExit");
+  }
+
+  event->ignore();
+}
+
 void DisplayWidget::updateCenterPos()
 {
 #ifdef _WIN32
@@ -348,11 +365,7 @@ bool DisplayWidget::event(QEvent* event)
 
     case QEvent::Close:
     {
-      // Closing the separate widget will either cancel the close, or trigger shutdown.
+      handleCloseEvent(static_cast<QCloseEvent*>(event));
-      // In the latter case, it's going to destroy us, so don't let Qt do it first.
-      QMetaObject::invokeMethod(g_main_window, "requestShutdown", Q_ARG(bool, true), Q_ARG(bool, true),
-                                Q_ARG(bool, false));
-      event->ignore();
       return true;
     }
 
@@ -416,13 +429,9 @@ DisplayWidget* DisplayContainer::removeDisplayWidget()
 
 bool DisplayContainer::event(QEvent* event)
 {
-  if (event->type() == QEvent::Close)
+  if (event->type() == QEvent::Close && m_display_widget)
   {
-    // Closing the separate widget will either cancel the close, or trigger shutdown.
+    m_display_widget->handleCloseEvent(static_cast<QCloseEvent*>(event));
-    // In the latter case, it's going to destroy us, so don't let Qt do it first.
-    QMetaObject::invokeMethod(g_main_window, "requestShutdown", Q_ARG(bool, true), Q_ARG(bool, true),
-                              Q_ARG(bool, false));
-    event->ignore();
     return true;
   }
 

src/duckstation-qt/displaywidget.h

@@ -5,6 +5,8 @@
 #include <QtWidgets/QWidget>
 #include <optional>
 
+class QCloseEvent;
+
 class DisplayWidget final : public QWidget
 {
   Q_OBJECT
@@ -24,6 +26,8 @@ public:
   void updateRelativeMode(bool enabled);
   void updateCursor(bool hidden);
 
+  void handleCloseEvent(QCloseEvent* event);
+
 Q_SIGNALS:
   void windowResizedEvent(int width, int height, float scale);
   void windowRestoredEvent();

src/duckstation-qt/mainwindow.cpp

@@ -2259,9 +2259,6 @@ void MainWindow::closeEvent(QCloseEvent* event)
     return;
   }
 
-  if (g_emu_thread->isRunningFullscreenUI())
-    g_emu_thread->stopFullscreenUI();
-
   saveGeometryToConfig();
   m_is_closing = true;
 
@@ -2412,7 +2409,7 @@ bool MainWindow::requestShutdown(bool allow_confirm /* = true */, bool allow_sav
     // Closing the window should shut down everything. If we don't set the closing flag here,
     // the VM shutdown may not complete by the time closeEvent() is called, leading to a confirm.
     m_is_closing = true;
-    close();
+    QGuiApplication::quit();
   }
 
   return true;
@@ -2424,7 +2421,9 @@ void MainWindow::requestExit(bool allow_save_to_state /* = true */)
   if (!requestShutdown(true, allow_save_to_state, true))
     return;
 
-  close();
+  // We could use close here, but if we're not visible (e.g. quitting from fullscreen), closing the window
+  // doesn't quit the application.
+  QGuiApplication::quit();
 }
 
 void MainWindow::checkForSettingChanges()

src/duckstation-qt/qthost.cpp

@@ -1373,7 +1373,9 @@ void EmuThread::stop()
 
 void EmuThread::stopInThread()
 {
-  m_shutdown_flag.store(true);
+  stopFullscreenUI();
+
+  m_shutdown_flag = true;
   m_event_loop->quit();
 }
 
@@ -1390,7 +1392,7 @@ void EmuThread::run()
   startBackgroundControllerPollTimer();
 
   // main loop
-  while (!m_shutdown_flag.load())
+  while (!m_shutdown_flag)
   {
     if (System::IsRunning())
     {
@@ -1398,9 +1400,6 @@ void EmuThread::run()
     }
     else
     {
-      m_event_loop->processEvents(QEventLoop::AllEvents);
-      CommonHost::PumpMessagesOnCPUThread();
-
       // we want to keep rendering the UI when paused and fullscreen UI is enabled
       if (!FullscreenUI::HasActiveWindow() && !System::IsRunning())
       {
@@ -1409,6 +1408,9 @@ void EmuThread::run()
         continue;
       }
 
+      m_event_loop->processEvents(QEventLoop::AllEvents);
+      CommonHost::PumpMessagesOnCPUThread();
+      if (g_host_display)
         renderDisplay(false);
     }
   }

src/duckstation-qt/qthost.h

@@ -210,8 +210,7 @@ private:
   QEventLoop* m_event_loop = nullptr;
   QTimer* m_background_controller_polling_timer = nullptr;
 
-  std::atomic_bool m_shutdown_flag{false};
+  bool m_shutdown_flag = false;
-
   bool m_run_fullscreen_ui = false;
   bool m_is_rendering_to_main = false;
   bool m_is_fullscreen = false;