Qt: Clear active buttons when focus is lost

CHANGES

@@ -30,6 +30,7 @@ Misc:
  - Qt: Set default log level to FATAL, ERROR and WARN
  - Qt: Clarify some phrasing in the menus
  - GBA Memory: Implement 16- and 32-bit loads from SRAM
+ - Qt: Clear active buttons when focus is lost
 
 0.1.0: (2014-12-13)
  - Initial release

src/platform/qt/GameController.cpp

@@ -272,6 +272,11 @@ void GameController::keyReleased(int key) {
 	updateKeys();
 }
 
+void GameController::clearKeys() {
+	m_activeKeys = 0;
+	updateKeys();
+}
+
 void GameController::setAudioBufferSamples(int samples) {
 	if (m_gameOpen) {
 		threadInterrupt();

src/platform/qt/GameController.h

@@ -80,6 +80,7 @@ public slots:
 	void frameAdvance();
 	void keyPressed(int key);
 	void keyReleased(int key);
+	void clearKeys();
 	void setAudioBufferSamples(int samples);
 	void setFPSTarget(float fps);
 	void loadState(int slot);

src/platform/qt/Window.cpp

@@ -280,6 +280,11 @@ void Window::closeEvent(QCloseEvent* event) {
 	QMainWindow::closeEvent(event);
 }
 
+void Window::focusOutEvent(QFocusEvent*) {
+	m_controller->setTurbo(false, false);
+	m_controller->clearKeys();
+}
+
 void Window::toggleFullScreen() {
 	if (isFullScreen()) {
 		showNormal();

src/platform/qt/Window.h

@@ -83,6 +83,7 @@ protected:
 	virtual void keyReleaseEvent(QKeyEvent* event) override;
 	virtual void resizeEvent(QResizeEvent*) override;
 	virtual void closeEvent(QCloseEvent*) override;
+	virtual void focusOutEvent(QFocusEvent*) override;
 
 private slots:
 	void gameStarted(GBAThread*);