Qt: Add hotkey to toggle mouse lock

pcsx2-gsrunner/Main.cpp

@@ -212,6 +212,10 @@ void Host::SetMouseMode(bool relative_mode, bool hide_cursor)
 {
 }
 
+void Host::SetMouseLock(bool state)
+{
+}
+
 std::optional<WindowInfo> Host::AcquireRenderWindow(bool recreate_window)
 {
 	return GSRunner::GetPlatformWindowInfo();

pcsx2-qt/MainWindow.cpp

@@ -440,6 +440,7 @@ void MainWindow::connectVMThreadSignals(EmuThread* thread)
 	connect(thread, &EmuThread::onReleaseRenderWindowRequested, this, &MainWindow::releaseRenderWindow, Qt::BlockingQueuedConnection);
 	connect(thread, &EmuThread::onResizeRenderWindowRequested, this, &MainWindow::displayResizeRequested);
 	connect(thread, &EmuThread::onMouseModeRequested, this, &MainWindow::mouseModeRequested);
+	connect(thread, &EmuThread::onMouseLockRequested, this, &MainWindow::mouseLockRequested);
 	connect(thread, &EmuThread::onFullscreenUIStateChange, this, &MainWindow::onFullscreenUIStateChange);
 	connect(thread, &EmuThread::onVMStarting, this, &MainWindow::onVMStarting);
 	connect(thread, &EmuThread::onVMStarted, this, &MainWindow::onVMStarted);
@@ -2664,6 +2665,30 @@ void MainWindow::mouseModeRequested(bool relative_mode, bool hide_cursor)
 		updateDisplayWidgetCursor();
 }
 
+void MainWindow::mouseLockRequested(bool state)
+{
+#ifdef __linux__ // Mouse locking is only supported on X11
+	const bool mouse_lock_supported = QGuiApplication::platformName().toLower() == "xcb";
+    if (!mouse_lock_supported)
+        return;
+#endif
+
+    Host::SetBaseBoolSettingValue("EmuCore", "EnableMouseLock", state);
+    Host::CommitBaseSettingChanges();
+
+    if (state) {
+        setupMouseMoveHandler();
+    } else {
+        Common::DetachMousePositionCb();
+    }
+
+    if (m_settings_window)
+    {
+        InterfaceSettingsWidget* interface_settings = m_settings_window->getInterfaceSettingsWidget();
+        interface_settings->updateMouseLockCheckbox(state ? Qt::Checked : Qt::Unchecked);
+    }
+}
+
 void MainWindow::releaseRenderWindow()
 {
 	// Now we can safely destroy the display window.

pcsx2-qt/MainWindow.h

@@ -138,6 +138,7 @@ private Q_SLOTS:
 	std::optional<WindowInfo> acquireRenderWindow(bool recreate_window, bool fullscreen, bool render_to_main, bool surfaceless);
 	void displayResizeRequested(qint32 width, qint32 height);
 	void mouseModeRequested(bool relative_mode, bool hide_cursor);
+    void mouseLockRequested(bool state);
 	void releaseRenderWindow();
 	void setupMouseMoveHandler();
 	void onGameListRefreshComplete();

pcsx2-qt/QtHost.cpp

@@ -1737,6 +1737,11 @@ void Host::SetMouseMode(bool relative_mode, bool hide_cursor)
 	emit g_emu_thread->onMouseModeRequested(relative_mode, hide_cursor);
 }
 
+void Host::SetMouseLock(bool state)
+{
+    emit g_emu_thread->onMouseLockRequested(state);
+}
+
 void QtHost::LockVMWithDialog()
 {
 	s_vm_locked_with_dialog++;

pcsx2-qt/QtHost.h

@@ -119,6 +119,7 @@ Q_SIGNALS:
 	void onResizeRenderWindowRequested(qint32 width, qint32 height);
 	void onReleaseRenderWindowRequested();
 	void onMouseModeRequested(bool relative_mode, bool hide_cursor);
+	void onMouseLockRequested(bool state);
 	void onFullscreenUIStateChange(bool running);
 
 	/// Called when the VM is starting initialization, but has not been completed yet.

pcsx2-qt/Settings/InterfaceSettingsWidget.cpp

@@ -250,6 +250,12 @@ void InterfaceSettingsWidget::updatePromptOnStateLoadSaveFailureCheckbox(Qt::Che
 	m_ui.promptOnStateLoadSaveFailure->setCheckState(state);
 }
 
+void InterfaceSettingsWidget::updateMouseLockCheckbox(Qt::CheckState state)
+{
+	QSignalBlocker blocker(m_ui.mouseLock);
+	m_ui.mouseLock->setCheckState(state);
+}
+
 void InterfaceSettingsWidget::onRenderToSeparateWindowChanged()
 {
 	m_ui.hideMainWindow->setEnabled(m_ui.renderToSeparateWindow->isChecked());

pcsx2-qt/Settings/InterfaceSettingsWidget.h

@@ -16,6 +16,7 @@ public:
 	~InterfaceSettingsWidget();
 
 	void updatePromptOnStateLoadSaveFailureCheckbox(Qt::CheckState state);
+    void updateMouseLockCheckbox(Qt::CheckState state);
 
 Q_SIGNALS:
 	void themeChanged();

pcsx2/Hotkeys.cpp

@@ -340,4 +340,9 @@ DEFINE_HOTKEY("DecreaseVolume", TRANSLATE_NOOP("Hotkeys", "Audio"), TRANSLATE_NO
 		if (!pressed && VMManager::HasValidVM())
 			HotkeyAdjustVolume(-5);
 	})
+DEFINE_HOTKEY("ToggleMouseLock", TRANSLATE_NOOP("Hotkeys", "System"), TRANSLATE_NOOP("Hotkeys", "Toggle Mouse Lock"),
+	[](s32 pressed) {
+		if (!pressed)
+			Host::SetMouseLock(!Host::GetBoolSettingValue("EmuCore", "EnableMouseLock"));
+	})
 END_HOTKEY_LIST()

pcsx2/Input/InputManager.h

@@ -323,4 +323,7 @@ namespace Host
 
 	/// Enables relative mouse mode in the host, and/or hides the cursor.
 	void SetMouseMode(bool relative_mode, bool hide_cursor);
+
+	/// Changes the mouse lock setting
+	void SetMouseLock(bool state);
 } // namespace Host

tests/ctest/core/StubHost.cpp

@@ -90,6 +90,10 @@ void Host::SetMouseMode(bool relative_mode, bool hide_cursor)
 {
 }
 
+void Host::SetMouseLock(bool state)
+{
+}
+
 std::optional<WindowInfo> Host::AcquireRenderWindow(bool recreate_window)
 {
 	return std::nullopt;