Qt: Hide cursor opportunistically

src/platform/qt/Display.cpp

@@ -51,6 +51,10 @@ Display::Display(QWidget* parent)
 {
 	setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);
 	setMinimumSize(VIDEO_HORIZONTAL_PIXELS, VIDEO_VERTICAL_PIXELS);
+	connect(&m_mouseTimer, SIGNAL(timeout()), this, SIGNAL(hideCursor()));
+	m_mouseTimer.setSingleShot(true);
+	m_mouseTimer.setInterval(MOUSE_DISAPPEAR_TIMER);
+	setMouseTracking(true);
 }
 
 void Display::resizeEvent(QResizeEvent*) {
@@ -69,3 +73,9 @@ void Display::filter(bool filter) {
 void Display::showMessage(const QString& message) {
 	m_messagePainter.showMessage(message);
 }
+
+void Display::mouseMoveEvent(QMouseEvent*) {
+	emit showCursor();
+	m_mouseTimer.stop();
+	m_mouseTimer.start();
+}

src/platform/qt/Display.h

@@ -33,6 +33,10 @@ public:
 	bool isAspectRatioLocked() const { return m_lockAspectRatio; }
 	bool isFiltered() const { return m_filter; }
 
+signals:
+	void showCursor();
+	void hideCursor();
+
 public slots:
 	virtual void startDrawing(GBAThread* context) = 0;
 	virtual void stopDrawing() = 0;
@@ -47,15 +51,19 @@ public slots:
 
 protected:
 	void resizeEvent(QResizeEvent*);
+	virtual void mouseMoveEvent(QMouseEvent*) override;
 
 	MessagePainter* messagePainter() { return &m_messagePainter; }
 
+
 private:
 	static Driver s_driver;
+	static const int MOUSE_DISAPPEAR_TIMER = 2000;
 
 	MessagePainter m_messagePainter;
 	bool m_lockAspectRatio;
 	bool m_filter;
+	QTimer m_mouseTimer;
 };
 
 }

src/platform/qt/DisplayGL.cpp

@@ -21,6 +21,8 @@ DisplayGL::DisplayGL(const QGLFormat& format, QWidget* parent)
 	, m_drawThread(nullptr)
 	, m_context(nullptr)
 {
+	m_gl->setMouseTracking(true);
+	m_gl->setAttribute(Qt::WA_TransparentForMouseEvents); // This doesn't seem to work?
 }
 
 DisplayGL::~DisplayGL() {

src/platform/qt/DisplayGL.h

@@ -9,6 +9,7 @@
 #include "Display.h"
 
 #include <QGLWidget>
+#include <QMouseEvent>
 #include <QThread>
 #include <QTimer>
 
@@ -27,6 +28,7 @@ public:
 protected:
 	void paintEvent(QPaintEvent*) override {}
 	void resizeEvent(QResizeEvent*) override {}
+	void mouseMoveEvent(QMouseEvent* event) override { event->ignore(); }
 };
 
 class PainterGL;

src/platform/qt/Window.cpp

@@ -128,6 +128,12 @@ Window::Window(ConfigController* config, int playerId, QWidget* parent)
 	connect(this, SIGNAL(audioBufferSamplesChanged(int)), m_controller, SLOT(setAudioBufferSamples(int)));
 	connect(this, SIGNAL(fpsTargetChanged(float)), m_controller, SLOT(setFPSTarget(float)));
 	connect(&m_fpsTimer, SIGNAL(timeout()), this, SLOT(showFPS()));
+	connect(m_display, &Display::hideCursor, [this]() {
+		setCursor(Qt::BlankCursor);
+	});
+	connect(m_display, &Display::showCursor, [this]() {
+		unsetCursor();
+	});
 
 	m_log.setLevels(GBA_LOG_WARN | GBA_LOG_ERROR | GBA_LOG_FATAL | GBA_LOG_STATUS);
 	m_fpsTimer.setInterval(FPS_TIMER_INTERVAL);