Qt: Add a method for the emulation thread to focus the display widget

src/duckstation-qt/mainwindow.cpp

@@ -84,11 +84,6 @@ void MainWindow::destroyDisplayWindow()
   m_display_widget = nullptr;
 }
 
-void MainWindow::toggleFullscreen()
-{
-  setFullscreen(!m_display_widget->isFullScreen());
-}
-
 void MainWindow::setFullscreen(bool fullscreen)
 {
   if (fullscreen)
@@ -110,6 +105,19 @@ void MainWindow::setFullscreen(bool fullscreen)
   m_ui.actionFullscreen->setChecked(fullscreen);
 }
 
+void MainWindow::toggleFullscreen()
+{
+  setFullscreen(!m_display_widget->isFullScreen());
+}
+
+void MainWindow::focusDisplayWidget()
+{
+  if (m_ui.mainContainer->currentIndex() != 1)
+    return;
+
+  m_display_widget->setFocus();
+}
+
 void MainWindow::onEmulationStarted()
 {
   m_emulation_running = true;
@@ -349,6 +357,7 @@ void MainWindow::connectSignals()
   connect(m_host_interface, &QtHostInterface::destroyDisplayWindowRequested, this, &MainWindow::destroyDisplayWindow);
   connect(m_host_interface, &QtHostInterface::setFullscreenRequested, this, &MainWindow::setFullscreen);
   connect(m_host_interface, &QtHostInterface::toggleFullscreenRequested, this, &MainWindow::toggleFullscreen);
+  connect(m_host_interface, &QtHostInterface::focusDisplayWidgetRequested, this, &MainWindow::focusDisplayWidget);
   connect(m_host_interface, &QtHostInterface::emulationStarted, this, &MainWindow::onEmulationStarted);
   connect(m_host_interface, &QtHostInterface::emulationStopped, this, &MainWindow::onEmulationStopped);
   connect(m_host_interface, &QtHostInterface::emulationPaused, this, &MainWindow::onEmulationPaused);

src/duckstation-qt/mainwindow.h

@@ -29,6 +29,7 @@ private Q_SLOTS:
   void destroyDisplayWindow();
   void setFullscreen(bool fullscreen);
   void toggleFullscreen();
+  void focusDisplayWidget();
   void onEmulationStarted();
   void onEmulationStopped();
   void onEmulationPaused(bool paused);

src/duckstation-qt/qthostinterface.cpp

@@ -303,10 +303,13 @@ void QtHostInterface::OnSystemPaused(bool paused)
 {
   HostInterface::OnSystemPaused(paused);
 
-  if (!paused)
-    wakeThread();
-
   emit emulationPaused(paused);
+
+  if (!paused)
+  {
+    wakeThread();
+    emit focusDisplayWidgetRequested();
+  }
 }
 
 void QtHostInterface::OnSystemDestroyed()

src/duckstation-qt/qthostinterface.h

@@ -75,6 +75,7 @@ Q_SIGNALS:
   void destroyDisplayWindowRequested();
   void setFullscreenRequested(bool fullscreen);
   void toggleFullscreenRequested();
+  void focusDisplayWidgetRequested();
   void systemPerformanceCountersUpdated(float speed, float fps, float vps, float avg_frame_time,
                                         float worst_frame_time);
   void runningGameChanged(const QString& filename, const QString& game_code, const QString& game_title);