Qt: Add option to pause on application focus loss

src/core/host_interface.cpp

@@ -417,6 +417,8 @@ void HostInterface::SetDefaultSettings(SettingsInterface& si)
   si.SetFloatValue("Main", "FastForwardSpeed", 0.0f);
   si.SetBoolValue("Main", "IncreaseTimerResolution", true);
   si.SetBoolValue("Main", "StartPaused", false);
+  si.SetBoolValue("Main", "StartFullscreen", false);
+  si.SetBoolValue("Main", "PauseOnFocusLoss", false);
   si.SetBoolValue("Main", "SaveStateOnExit", true);
   si.SetBoolValue("Main", "ConfirmPowerOff", true);
   si.SetBoolValue("Main", "LoadDevicesFromSaveStates", false);

src/core/settings.cpp

@@ -114,6 +114,7 @@ void Settings::Load(SettingsInterface& si)
   increase_timer_resolution = si.GetBoolValue("Main", "IncreaseTimerResolution", true);
   start_paused = si.GetBoolValue("Main", "StartPaused", false);
   start_fullscreen = si.GetBoolValue("Main", "StartFullscreen", false);
+  pause_on_focus_loss = si.GetBoolValue("Main", "PauseOnFocusLoss", false);
   save_state_on_exit = si.GetBoolValue("Main", "SaveStateOnExit", true);
   confim_power_off = si.GetBoolValue("Main", "ConfirmPowerOff", true);
   load_devices_from_save_states = si.GetBoolValue("Main", "LoadDevicesFromSaveStates", false);
@@ -259,6 +260,7 @@ void Settings::Save(SettingsInterface& si) const
   si.SetBoolValue("Main", "IncreaseTimerResolution", increase_timer_resolution);
   si.SetBoolValue("Main", "StartPaused", start_paused);
   si.SetBoolValue("Main", "StartFullscreen", start_fullscreen);
+  si.SetBoolValue("Main", "PauseOnFocusLoss", pause_on_focus_loss);
   si.SetBoolValue("Main", "SaveStateOnExit", save_state_on_exit);
   si.SetBoolValue("Main", "ConfirmPowerOff", confim_power_off);
   si.SetBoolValue("Main", "LoadDevicesFromSaveStates", load_devices_from_save_states);

src/core/settings.h

@@ -83,6 +83,7 @@ struct Settings
   bool increase_timer_resolution = true;
   bool start_paused = false;
   bool start_fullscreen = false;
+  bool pause_on_focus_loss = false;
   bool save_state_on_exit = true;
   bool confim_power_off = true;
   bool load_devices_from_save_states = false;

src/duckstation-qt/generalsettingswidget.cpp

@@ -17,6 +17,8 @@ GeneralSettingsWidget::GeneralSettingsWidget(QtHostInterface* host_interface, QW
   }
 
   SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.pauseOnStart, "Main", "StartPaused", false);
+  SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.pauseOnFocusLoss, "Main", "PauseOnFocusLoss",
+                                               false);
   SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.startFullscreen, "Main", "StartFullscreen",
                                                false);
   SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.renderToMain, "Main", "RenderToMainWindow", true);
@@ -87,7 +89,7 @@ GeneralSettingsWidget::GeneralSettingsWidget(QtHostInterface* host_interface, QW
                                 "to use XInput over SDL2 for compatibility."));
 
   // Since this one is compile-time selected, we don't put it in the .ui file.
-  int current_col = 0;
+  int current_col = 1;
   int current_row = m_ui.formLayout_4->rowCount() - current_col;
 #ifdef WITH_DISCORD_PRESENCE
   {

src/duckstation-qt/generalsettingswidget.ui

@@ -32,7 +32,7 @@
       <string>Behaviour</string>
      </property>
      <layout class="QGridLayout" name="formLayout_4">
-      <item row="0" column="1">
+      <item row="1" column="0">
        <widget class="QCheckBox" name="confirmPowerOff">
         <property name="text">
          <string>Confirm Power Off</string>
@@ -53,24 +53,24 @@
         </property>
        </widget>
       </item>
-      <item row="2" column="0">
-       <widget class="QCheckBox" name="startFullscreen">
+      <item row="0" column="1">
+       <widget class="QCheckBox" name="pauseOnFocusLoss">
         <property name="text">
-         <string>Start Fullscreen</string>
+         <string>Pause On Focus Loss</string>
         </property>
        </widget>
       </item>
-      <item row="1" column="0">
-       <widget class="QCheckBox" name="saveStateOnExit">
+      <item row="2" column="0">
+       <widget class="QCheckBox" name="startFullscreen">
         <property name="text">
-         <string>Save State On Exit</string>
+         <string>Start Fullscreen</string>
         </property>
        </widget>
       </item>
       <item row="1" column="1">
-       <widget class="QCheckBox" name="loadDevicesFromSaveStates">
+       <widget class="QCheckBox" name="saveStateOnExit">
         <property name="text">
-         <string>Load Devices From Save States</string>
+         <string>Save State On Exit</string>
         </property>
        </widget>
       </item>
@@ -88,6 +88,13 @@
         </property>
        </widget>
       </item>
+      <item row="4" column="0">
+       <widget class="QCheckBox" name="loadDevicesFromSaveStates">
+        <property name="text">
+         <string>Load Devices From Save States</string>
+        </property>
+       </widget>
+      </item>
      </layout>
     </widget>
    </item>

src/duckstation-qt/mainwindow.cpp

@@ -342,6 +342,31 @@ void MainWindow::onRunningGameChanged(const QString& filename, const QString& ga
     m_display_widget->setWindowTitle(windowTitle());
 }
 
+void MainWindow::onApplicationStateChanged(Qt::ApplicationState state)
+{
+  if (!m_emulation_running || !g_settings.pause_on_focus_loss)
+    return;
+
+  const bool focus_loss = (state != Qt::ApplicationActive);
+  if (focus_loss)
+  {
+    if (!m_was_paused_by_focus_loss && !System::IsPaused())
+    {
+      m_host_interface->pauseSystem(true);
+      m_was_paused_by_focus_loss = true;
+    }
+  }
+  else
+  {
+    if (m_was_paused_by_focus_loss)
+    {
+      if (System::IsPaused())
+        m_host_interface->pauseSystem(false);
+      m_was_paused_by_focus_loss = false;
+    }
+  }
+}
+
 void MainWindow::onStartDiscActionTriggered()
 {
   QString filename =
@@ -796,6 +821,8 @@ void MainWindow::connectSignals()
   updateEmulationActions(false, false);
   onEmulationPaused(false);
 
+  connect(qApp, &QGuiApplication::applicationStateChanged, this, &MainWindow::onApplicationStateChanged);
+
   connect(m_ui.actionStartDisc, &QAction::triggered, this, &MainWindow::onStartDiscActionTriggered);
   connect(m_ui.actionStartBios, &QAction::triggered, this, &MainWindow::onStartBIOSActionTriggered);
   connect(m_ui.actionResumeLastState, &QAction::triggered, m_host_interface,

src/duckstation-qt/mainwindow.h

@@ -60,6 +60,7 @@ private Q_SLOTS:
   void onSystemPerformanceCountersUpdated(float speed, float fps, float vps, float average_frame_time,
                                           float worst_frame_time);
   void onRunningGameChanged(const QString& filename, const QString& game_code, const QString& game_title);
+  void onApplicationStateChanged(Qt::ApplicationState state);
 
   void onStartDiscActionTriggered();
   void onStartBIOSActionTriggered();
@@ -137,4 +138,5 @@ private:
   CheatManagerDialog* m_cheat_manager_dialog = nullptr;
 
   bool m_emulation_running = false;
+  bool m_was_paused_by_focus_loss = false;
 };