[SERVER] Implement all four VNC projection modes

1 files changed, 173 insertions, 23 deletions

diff --git a/src/server/mainwindow/mainwindow.cpp b/src/server/mainwindow/mainwindow.cpp
index bbd6b33..48a1a57 100644
--- a/src/server/mainwindow/mainwindow.cpp
+++ b/src/server/mainwindow/mainwindow.cpp
@@ -61,7 +61,10 @@ MainWindow::MainWindow(QWidget* parent) :
 
 	// Close button in tool bar
 	connect(ui->action_Exit, SIGNAL(triggered()), this, SLOT(onButtonExit()));
-	connect(ui->action_BroadcastScreen, SIGNAL(triggered()), this, SLOT(onButtonBroadcast()));
+	connect(ui->action_BroadcastScreen, SIGNAL(triggered()), this, SLOT(onButtonStudentToAll()));
+	connect(ui->action_TutorToAll, SIGNAL(triggered()), this, SLOT(onButtonTutorToAll()));
+	connect(ui->action_StudentToTutor, SIGNAL(triggered()), this, SLOT(onButtonStudentToTutor()));
+	connect(ui->action_TutorToStudent, SIGNAL(triggered()), this, SLOT(onButtonTutorToStudent()));
 	connect(ui->action_Lock, SIGNAL(toggled(bool)), this, SLOT(onButtonLock(bool)));
 	// Clicking the session name label shows the edit field for it
 	connect(_sessionNameLabel, SIGNAL(clicked()), this, SLOT(onSessionNameClick()));
@@ -350,45 +353,192 @@ void MainWindow::onButtonChat()
 	 */
 }
 
-void MainWindow::onButtonBroadcast()
+void MainWindow::prepareForProjection(Client * const from, Client * const to)
+{
+	// Projection source is never allowed to be an active VNC viewer
+	if (from->isActiveVncClient())
+		from->stopVncClient();
+
+	if (to == NULL)
+	{
+		// One to many
+		from->setProjectionSource(true);
+
+		if (from->isActiveVncServer())
+		{
+			// From is already active, if there is at least one active client, assume it is not
+			// shutting down, so we can directly tell the new client to connect to it
+			for (QList<ConnectionFrame*>::iterator it(_clientFrames.begin()); it != _clientFrames.end(); ++it)
+			{
+				Client *c = (**it).client();
+				if (c == NULL || c->id() == from->id())
+					continue;
+				if (c->currentProjectionSource() != from->id())
+					continue;
+				// Yep :-)
+				this->onVncServerStateChange(from);
+				return;
+			}
+		}
+		// Could not take shortcut, (re)start VNC server on source
+		from->startVncServer();
+		return;
+	}
+
+	// One to one is desired, figure out what to do with current client
+
+	if (to->isActiveVncClient())
+		to->stopVncClient();
+	to->setDesiredProjectionSource(from->id());
+
+	if (from->isActiveVncServer())
+	{
+		// From is already active, if there is at least one active client, assume it is not
+		// shutting down, so we can directly tell the new client to connect to it
+		for (QList<ConnectionFrame*>::iterator it(_clientFrames.begin()); it != _clientFrames.end(); ++it)
+		{
+			Client *c = (**it).client();
+			if (c == NULL || c->id() == from->id())
+				continue;
+			if (c->currentProjectionSource() != from->id())
+				continue;
+			// Yep :-)
+			this->onVncServerStateChange(from);
+			return;
+		}
+	}
+	// Could not take shortcut, (re)start VNC server on source
+	from->startVncServer();
+}
+
+void MainWindow::onButtonStudentToAll()
 {
 	const qint64 now = QDateTime::currentMSecsSinceEpoch();
 	if (now < _buttonBlockTime)
 		return;
 	_buttonBlockTime = now + 3000;
-	Client *source = NULL; // the desired source (selected frame)
-	Client *oldSource = NULL; // if there is a client that is already broadcaster, save it here
+	//
+	Client *from = NULL;
 	for (QList<ConnectionFrame*>::iterator it(_clientFrames.begin()); it != _clientFrames.end(); ++it)
 	{
 		Client *c = (**it).client();
+		if (c == NULL)
+			continue;
 		if ((**it).selected())
-			source = c;
-		if (c != NULL && c->isProjectionSource())
-			oldSource = c;
+			from = c;
+		else
+			c->setProjectionSource(false);
 	}
-	if (source == NULL && oldSource == NULL)
-	{
-		QMessageBox::information(this, tr("No Projection Source selected"), tr("You did not select any active client as the connection source."));
+	if (from == NULL)
+		QMessageBox::critical(this,
+			tr("Projection"),
+			tr("No projection source selected.")
+		);
+	else
+		prepareForProjection(from, NULL);
+}
+
+void MainWindow::onButtonStudentToTutor()
+{
+	const qint64 now = QDateTime::currentMSecsSinceEpoch();
+	if (now < _buttonBlockTime)
 		return;
+	_buttonBlockTime = now + 3000;
+	//
+	Client *from = NULL;
+	Client *to = NULL;
+	for (QList<ConnectionFrame*>::iterator it(_clientFrames.begin()); it != _clientFrames.end(); ++it)
+	{
+		Client *c = (**it).client();
+		if (c == NULL)
+			continue;
+		if ((**it).selected())
+			from = c;
+		else if ((**it).isTutor())
+			to = c;
 	}
-	if (oldSource != NULL)
+	if (from == NULL)
+		QMessageBox::critical(this,
+			tr("Projection"),
+			tr("No projection source selected.")
+		);
+	else if (to == NULL)
+		QMessageBox::critical(this,
+			tr("Projection"),
+			tr("No tutor defined, or tutor is offline.")
+		);
+	else if (to == from)
+		QMessageBox::critical(this,
+			tr("Projection"),
+			tr("Selected projection target is tutor.")
+		);
+	else
+		prepareForProjection(from, to);
+}
+
+void MainWindow::onButtonTutorToAll()
+{
+	const qint64 now = QDateTime::currentMSecsSinceEpoch();
+	if (now < _buttonBlockTime)
+		return;
+	_buttonBlockTime = now + 3000;
+	//
+	Client *from = NULL;
+	for (QList<ConnectionFrame*>::iterator it(_clientFrames.begin()); it != _clientFrames.end(); ++it)
 	{
-		// Is already broadcast source, disable
-		oldSource->setProjectionSource(false);
-		oldSource->stopVncServer();
-		if (source == NULL || source->id() == oldSource->id())
-			return;
+		Client *c = (**it).client();
+		if (c == NULL)
+			continue;
+		if ((**it).isTutor())
+			from = c;
+		else
+			c->setProjectionSource(false);
 	}
-	source->setProjectionSource(true);
+	if (from == NULL)
+		QMessageBox::critical(this,
+			tr("Projection"),
+			tr("No tutor defined, or tutor is offline.")
+		);
+	else
+		prepareForProjection(from, NULL);
+}
+
+void MainWindow::onButtonTutorToStudent()
+{
+	const qint64 now = QDateTime::currentMSecsSinceEpoch();
+	if (now < _buttonBlockTime)
+		return;
+	_buttonBlockTime = now + 3000;
+	//
+	Client *from = NULL;
+	Client *to = NULL;
 	for (QList<ConnectionFrame*>::iterator it(_clientFrames.begin()); it != _clientFrames.end(); ++it)
 	{
 		Client *c = (**it).client();
-		if (c == NULL || c->id() == source->id())
+		if (c == NULL)
 			continue;
-		//c->setDesiredProjectionSource(source->id());
-		c->setProjectionSource(false);
+		if ((**it).selected())
+			to = c;
+		else if ((**it).isTutor())
+			from = c;
 	}
-	source->startVncServer();
+	if (from == NULL)
+		QMessageBox::critical(this,
+			tr("Projection"),
+			tr("No projection source selected.")
+		);
+	else if (to == NULL)
+		QMessageBox::critical(this,
+			tr("Projection"),
+			tr("No tutor defined, or tutor is offline.")
+		);
+	else if (to == from)
+		QMessageBox::critical(this,
+			tr("Projection"),
+			tr("Selected projection source is tutor.")
+		);
+	else
+		prepareForProjection(from, to);
 }
 
 void MainWindow::onButtonLock(bool checked)
@@ -518,11 +668,11 @@ void MainWindow::onClientAuthenticated(Client* client)
 		// Move to any free tile
 		placeFrameInFreeSlot(cf);
 	}
-	// Assign client instance
-	cf->assignClient(client);
 	// Make first active client tutor
 	if (!anyClient && !hasActiveTutor)
 		cf->setTutor(true);
+	// Assign client instance
+	cf->assignClient(client);
 	// ################
 	NetworkMessage msg;
 	// If clients are currently locked, tell this new client