Attempts mouse event capture.

OSBindings/Qt/mainwindow.cpp

@@ -709,30 +709,41 @@ void MainWindow::setUIPhase(UIPhase phase) {
 	ui->topTipLabel->setVisible(phase == UIPhase::SelectingMachine);
 
 	// Consider setting a window title, if it's knowable.
-	switch(phase) {
-		case UIPhase::SelectingMachine:
-			setWindowTitle(tr("Select a machine..."));
-		break;
-		case UIPhase::RequestingROMs:
-			setWindowTitle(tr("Provide ROMs..."));
-		break;
-
-		default:
-			// Update the window title. TODO: clearly I need a proper functional solution for the window title.
-			if(openFileName.isEmpty()) {
-				const auto machineType = targets[0]->machine;
-				setWindowTitle(QString::fromStdString(Machine::LongNameForTargetMachine(machineType)));
-			} else {
-				setWindowTitle(openFileName);
-			}
-		break;
-	}
+	setWindowTitle();
 
 	// Set appropriate focus if necessary; e.g. this ensures that machine-picker
 	// widgets aren't still selectable after a machine starts.
 	if(phase != UIPhase::SelectingMachine) {
 		ui->openGLWidget->setFocus();
 	}
+
+	// Indicate whether to catch mouse input.
+	ui->openGLWidget->setMouseDelegate(
+		(phase == UIPhase::RunningMachine && machine && machine->mouse_machine()) ? this : nullptr
+	);
+}
+
+void MainWindow::setWindowTitle() {
+	QString title;
+
+	switch(uiPhase) {
+		case UIPhase::SelectingMachine:		title = tr("Select a machine...");		break;
+		case UIPhase::RequestingROMs:		title = tr("Provide ROMs...");			break;
+
+		default:
+			// Update the window title. TODO: clearly I need a proper functional solution for the window title.
+			if(openFileName.isEmpty()) {
+				const auto machineType = targets[0]->machine;
+				title = QString::fromStdString(Machine::LongNameForTargetMachine(machineType));
+			} else {
+				title = openFileName;
+			}
+		break;
+	}
+
+	if(mouseIsCaptured) title += " (press control+escape to release mouse)";
+
+	QMainWindow::setWindowTitle(title);
 }
 
 // MARK: - Event Processing
@@ -817,6 +828,27 @@ bool MainWindow::processEvent(QKeyEvent *event) {
 	return false;
 }
 
+void MainWindow::setMouseIsCaptured(bool isCaptured) {
+	mouseIsCaptured = isCaptured;
+	setWindowTitle();
+}
+
+void MainWindow::moveMouse(QPoint vector) {
+	std::unique_lock lock(machineMutex);
+	auto mouseMachine = machine->mouse_machine();
+	if(!mouseMachine) return;
+
+	mouseMachine->get_mouse().move(vector.x(), vector.y());
+}
+
+void MainWindow::setButtonPressed(int index, bool isPressed) {
+	std::unique_lock lock(machineMutex);
+	auto mouseMachine = machine->mouse_machine();
+	if(!mouseMachine) return;
+
+	mouseMachine->get_mouse().set_button_pressed(index, isPressed);
+}
+
 // MARK: - New Machine Creation
 
 #include "../../Analyser/Static/Acorn/Target.hpp"

OSBindings/Qt/mainwindow.h

@@ -21,7 +21,7 @@ QT_BEGIN_NAMESPACE
 namespace Ui { class MainWindow; }
 QT_END_NAMESPACE
 
-class MainWindow : public QMainWindow, public Outputs::Speaker::Speaker::Delegate {
+class MainWindow : public QMainWindow, public Outputs::Speaker::Speaker::Delegate, public ScanTargetWidget::MouseDelegate {
 		Q_OBJECT
 
 		void createActions();
@@ -35,6 +35,10 @@ class MainWindow : public QMainWindow, public Outputs::Speaker::Speaker::Delegat
 		void keyPressEvent(QKeyEvent *event) override;
 		void keyReleaseEvent(QKeyEvent *event) override;
 
+		void setMouseIsCaptured(bool) override;
+		void moveMouse(QPoint) override;
+		void setButtonPressed(int index, bool isPressed) override;
+
 	private:
 		std::unique_ptr<Ui::MainWindow> ui;
 		std::unique_ptr<Timer> timer;
@@ -117,6 +121,9 @@ class MainWindow : public QMainWindow, public Outputs::Speaker::Speaker::Delegat
 
 		void addAtari2600Menu();
 		void toggleAtari2600Switch(Atari2600Switch toggleSwitch);
+
+		void setWindowTitle();
+		bool mouseIsCaptured = false;
 };
 
 #endif // MAINWINDOW_H

OSBindings/Qt/scantargetwidget.cpp

@@ -1,9 +1,12 @@
 #include "scantargetwidget.h"
 
 #include <QApplication>
+#include <QCursor>
 #include <QDebug>
 #include <QDesktopWidget>
 #include <QGuiApplication>
+#include <QKeyEvent>
+#include <QMouseEvent>
 #include <QOpenGLContext>
 #include <QScreen>
 #include <QTimer>
@@ -21,10 +24,10 @@ void ScanTargetWidget::initializeGL() {
 }
 
 void ScanTargetWidget::paintGL() {
-	if(requested_redraw_time_) {
+	if(requestedRedrawTime) {
 		const auto now = Time::nanos_now();
-		vsyncPredictor.add_timer_jitter(now - requested_redraw_time_);
-		requested_redraw_time_ = 0;
+		vsyncPredictor.add_timer_jitter(now - requestedRedrawTime);
+		requestedRedrawTime = 0;
 	}
 
 	// TODO: if Qt 5.14 can be guaranteed, just use window()->screen().
@@ -81,27 +84,27 @@ void ScanTargetWidget::vsync() {
 	vsyncPredictor.announce_vsync();
 
 	const auto time_now = Time::nanos_now();
-	requested_redraw_time_ = vsyncPredictor.suggested_draw_time();
-	const auto delay_time = (requested_redraw_time_ - time_now) / 1'000'000;
+	requestedRedrawTime = vsyncPredictor.suggested_draw_time();
+	const auto delay_time = (requestedRedrawTime - time_now) / 1'000'000;
 	if(delay_time > 0) {
 		QTimer::singleShot(delay_time, this, SLOT(repaint()));
 	} else {
-		requested_redraw_time_ = 0;
+		requestedRedrawTime = 0;
 		repaint();
 	}
 }
 
 void ScanTargetWidget::resizeGL(int w, int h) {
-	if(width != w || height != h) {
-		width = w;
-		height = h;
+	if(rawWidth != w || rawHeight != h) {
+		rawWidth = w;
+		rawHeight = h;
 		resize();
 	}
 }
 
 void ScanTargetWidget::resize() {
-	const int newScaledWidth = int(float(width) * outputScale);
-	const int newScaledHeight = int(float(height) * outputScale);
+	const int newScaledWidth = int(float(rawWidth) * outputScale);
+	const int newScaledHeight = int(float(rawHeight) * outputScale);
 
 	if(newScaledWidth != scaledWidth || newScaledHeight != scaledHeight) {
 		scaledWidth = newScaledWidth;
@@ -121,7 +124,7 @@ void ScanTargetWidget::stop() {
 	isConnected = false;
 	setDefaultClearColour();
 	vsyncPredictor.pause();
-	requested_redraw_time_ = 0;
+	requestedRedrawTime = 0;
 	repaint();
 }
 
@@ -130,3 +133,76 @@ void ScanTargetWidget::setDefaultClearColour() {
 	const QColor backgroundColour = palette().color(QWidget::backgroundRole());
 	glClearColor(backgroundColour.redF(), backgroundColour.greenF(), backgroundColour.blueF(), 1.0);
 }
+
+void ScanTargetWidget::setMouseDelegate(MouseDelegate *delegate) {
+	if(!delegate && mouseIsCaptured) {
+		releaseMouse();
+	}
+	mouseDelegate = delegate;
+	setMouseTracking(delegate);
+}
+
+void ScanTargetWidget::keyPressEvent(QKeyEvent *event) {
+	if(mouseIsCaptured && event->key() == Qt::Key_Escape && event->modifiers()&Qt::ControlModifier) {
+		releaseMouse();
+
+		QCursor cursor;
+		cursor.setShape(Qt::ArrowCursor);
+		setCursor(cursor);
+	}
+}
+
+void ScanTargetWidget::releaseMouse() {
+	QOpenGLWidget::releaseMouse();
+	mouseIsCaptured = false;
+	mouseDelegate->setMouseIsCaptured(false);
+}
+
+void ScanTargetWidget::mousePressEvent(QMouseEvent *event) {
+	if(mouseDelegate) {
+		if(!mouseIsCaptured) {
+			mouseIsCaptured = true;
+			grabMouse();
+
+			QCursor cursor;
+			cursor.setPos(mapToGlobal(QPoint(width() / 2, height() / 2)));
+			cursor.setShape(Qt::BlankCursor);
+			setCursor(cursor);
+
+			mouseDelegate->setMouseIsCaptured(true);
+		} else {
+			setMouseButtonPressed(event->button(), true);
+		}
+	}
+}
+
+void ScanTargetWidget::mouseReleaseEvent(QMouseEvent *event) {
+	if(mouseDelegate && !mouseIsCaptured) {
+		setMouseButtonPressed(event->button(), false);
+	}
+}
+
+void ScanTargetWidget::setMouseButtonPressed(Qt::MouseButton button, bool isPressed) {
+	switch(button) {
+		default: break;
+		case Qt::LeftButton:	mouseDelegate->setButtonPressed(0, isPressed);	break;
+		case Qt::RightButton:	mouseDelegate->setButtonPressed(1, isPressed);	break;
+		case Qt::MiddleButton:	mouseDelegate->setButtonPressed(2, isPressed);	break;
+	}
+}
+
+void ScanTargetWidget::mouseMoveEvent(QMouseEvent *event) {
+	// Recentre the mouse cursor upon every move if it is currently captured.
+	if(mouseDelegate && mouseIsCaptured) {
+		const QPoint centre = QPoint(width() / 2, height() / 2);
+		const QPoint vector = event->pos() - centre;
+
+		mouseDelegate->moveMouse(vector);
+
+		QCursor::setPos(mapToGlobal(centre));
+	}
+}
+
+bool ScanTargetWidget::isMouseCaptured() {
+	return mouseIsCaptured;
+}

OSBindings/Qt/scantargetwidget.h

@@ -8,23 +8,44 @@
 
 #include "../../ClockReceiver/VSyncPredictor.hpp"
 
-class ScanTargetWidget : public QOpenGLWidget
-{
+class ScanTargetWidget : public QOpenGLWidget {
 	public:
 		ScanTargetWidget(QWidget *parent = nullptr);
 		~ScanTargetWidget();
 
-		// Sets the current scan producer; this scan producer will be
-		// handed a suitable scan target as soon as one exists.
+		/// Sets the current scan producer; this scan producer will be
+		/// handed a suitable scan target as soon as one exists.
 		void setScanProducer(MachineTypes::ScanProducer *);
 
+		/// Destructs the current scan target
 		void stop();
 
+		struct MouseDelegate {
+			virtual void setMouseIsCaptured(bool) = 0;
+			virtual void moveMouse(QPoint) = 0;
+			virtual void setButtonPressed(int index, bool isPressed) = 0;
+		};
+		/// If a delegate is assigned then this widget will respond to clicks by capturing
+		/// the mouse, unless and until either ::stop() is called or ctrl+escape is pressed.
+		/// Mouse events can be tracked by the main window while the mouse is captured.
+		void setMouseDelegate(MouseDelegate *);
+
+		/// @returns @c true if the mouse is currently captured; @c false otherwise.
+		bool isMouseCaptured();
+
 	protected:
 		void initializeGL() override;
 		void resizeGL(int w, int h) override;
 		void paintGL() override;
 
+		void mousePressEvent(QMouseEvent *) override;
+		void mouseReleaseEvent(QMouseEvent *) override;
+		void mouseMoveEvent(QMouseEvent *) override;
+		void keyPressEvent(QKeyEvent *) override;
+
+		void releaseMouse();
+		void setMouseButtonPressed(Qt::MouseButton, bool);
+
 	private:
 		// This should be created only once there's an OpenGL context. So it
 		// can't be done at creation time.
@@ -34,15 +55,18 @@ class ScanTargetWidget : public QOpenGLWidget
 		GLuint framebuffer = 0;
 		MachineTypes::ScanProducer *producer = nullptr;
 
-		Time::Nanos requested_redraw_time_ = 0;
+		Time::Nanos requestedRedrawTime = 0;
 
 		void setDefaultClearColour();
 
-		int width = 0, height = 0;
+		int rawWidth = 0, rawHeight = 0;
 		int scaledWidth = 0, scaledHeight = 0;
 		float outputScale = 1.0f;
 		void resize();
 
+		MouseDelegate *mouseDelegate = nullptr;
+		bool mouseIsCaptured = false;
+
 	private slots:
 		void vsync();
 };