Qt: Power off system correctly when exiting

src/duckstation-qt/mainwindow.cpp

@@ -161,8 +161,6 @@ void MainWindow::onStartBiosActionTriggered()
   m_host_interface->bootSystem(QString(), QString());
 }
 
-void MainWindow::onExitActionTriggered() {}
-
 void MainWindow::onGitHubRepositoryActionTriggered() {}
 
 void MainWindow::onIssueTrackerActionTriggered() {}
@@ -276,7 +274,7 @@ void MainWindow::connectSignals()
   connect(m_ui.actionPause, &QAction::toggled, m_host_interface, &QtHostInterface::pauseSystem);
   connect(m_ui.actionLoadState, &QAction::triggered, this, [this]() { m_ui.menuLoadState->exec(QCursor::pos()); });
   connect(m_ui.actionSaveState, &QAction::triggered, this, [this]() { m_ui.menuSaveState->exec(QCursor::pos()); });
-  connect(m_ui.actionExit, &QAction::triggered, this, &MainWindow::onExitActionTriggered);
+  connect(m_ui.actionExit, &QAction::triggered, this, &MainWindow::close);
   connect(m_ui.actionFullscreen, &QAction::triggered, this, &MainWindow::toggleFullscreen);
   connect(m_ui.actionSettings, &QAction::triggered, [this]() { doSettings(SettingsDialog::Category::Count); });
   connect(m_ui.actionConsoleSettings, &QAction::triggered,
@@ -403,3 +401,9 @@ void MainWindow::populateLoadSaveStateMenus(QString game_code)
     }
   }
 }
+
+void MainWindow::closeEvent(QCloseEvent* event)
+{
+  m_host_interface->powerOffSystem(true, true);
+  QMainWindow::closeEvent(event);
+}

src/duckstation-qt/mainwindow.h

@@ -12,7 +12,7 @@ class QLabel;
 class GameListWidget;
 class QtHostInterface;
 
-class MainWindow : public QMainWindow
+class MainWindow final : public QMainWindow
 {
   Q_OBJECT
 
@@ -35,11 +35,13 @@ private Q_SLOTS:
   void onChangeDiscFromFileActionTriggered();
   void onChangeDiscFromGameListActionTriggered();
   void onStartBiosActionTriggered();
-  void onExitActionTriggered();
   void onGitHubRepositoryActionTriggered();
   void onIssueTrackerActionTriggered();
   void onAboutActionTriggered();
 
+protected:
+  void closeEvent(QCloseEvent* event) override;
+
 private:
   void setupAdditionalUi();
   void connectSignals();