Added support on X11 for a global option to delay switching screens

when the mouse reaches a jump zone.

lib/platform/CXWindowsPrimaryScreen.cpp

@@ -102,6 +102,12 @@ CXWindowsPrimaryScreen::setOptions(const COptionsList& options)
 	}
 }
 
+UInt32
+CXWindowsPrimaryScreen::addOneShotTimer(double timeout)
+{
+	return m_screen->addOneShotTimer(timeout);
+}
+
 KeyModifierMask
 CXWindowsPrimaryScreen::getToggleMask() const
 {
@@ -387,6 +393,12 @@ CXWindowsPrimaryScreen::onEvent(CEvent* event)
 	return false;
 }
 
+void
+CXWindowsPrimaryScreen::onOneShotTimerExpired(UInt32 id)
+{
+	m_receiver->onOneShotTimerExpired(id);
+}
+
 SInt32
 CXWindowsPrimaryScreen::getJumpZoneSize() const
 {

lib/platform/CXWindowsPrimaryScreen.h

@@ -40,6 +40,7 @@ public:
 	virtual void		warpCursor(SInt32 x, SInt32 y);
 	virtual void		resetOptions();
 	virtual void		setOptions(const COptionsList& options);
+	virtual UInt32		addOneShotTimer(double timeout);
 	virtual KeyModifierMask	getToggleMask() const;
 	virtual bool		isLockedToScreen() const;
 	virtual IScreen*	getScreen() const;
@@ -48,6 +49,7 @@ public:
 	virtual void		onScreensaver(bool activated);
 	virtual bool		onPreDispatch(const CEvent* event);
 	virtual bool		onEvent(CEvent* event);
+	virtual void		onOneShotTimerExpired(UInt32 id);
 	virtual SInt32		getJumpZoneSize() const;
 
 protected:

lib/platform/CXWindowsScreen.cpp

@@ -54,14 +54,13 @@
 // CXWindowsScreen::CTimer
 //
 
-CXWindowsScreen::CTimer::CTimer(IJob* job, double timeout) :
+CXWindowsScreen::CTimer::CTimer(IJob* job, double startTime, double resetTime) :
 	m_job(job),
-	m_timeout(timeout)
+	m_timeout(resetTime),
+	m_time(resetTime),
+	m_startTime(startTime)
 {
-	assert(m_job != NULL);
 	assert(m_timeout > 0.0);
-
-	reset();
 }
 
 CXWindowsScreen::CTimer::~CTimer()
@@ -72,19 +71,23 @@ CXWindowsScreen::CTimer::~CTimer()
 void
 CXWindowsScreen::CTimer::run()
 {
+	if (m_job != NULL) {
 		m_job->run();
 	}
+}
 
 void
 CXWindowsScreen::CTimer::reset()
 {
 	m_time      = m_timeout;
+	m_startTime = 0.0;
 }
 
 CXWindowsScreen::CTimer::CTimer&
 CXWindowsScreen::CTimer::operator-=(double dt)
 {
-	m_time -= dt;
+	m_time     -= dt - m_startTime;
+	m_startTime = 0.0;
 	return *this;
 }
 
@@ -118,7 +121,8 @@ CXWindowsScreen::CXWindowsScreen(IScreenReceiver* receiver,
 	m_w(0), m_h(0),
 	m_screensaver(NULL),
 	m_screensaverNotify(false),
-	m_atomScreensaver(None)
+	m_atomScreensaver(None),
+	m_oneShotTimer(NULL)
 {
 	assert(s_screen       == NULL);
 	assert(m_receiver     != NULL);
@@ -137,6 +141,7 @@ CXWindowsScreen::~CXWindowsScreen()
 	assert(s_screen  != NULL);
 	assert(m_display == NULL);
 
+	delete m_oneShotTimer;
 	s_screen = NULL;
 }
 
@@ -145,7 +150,7 @@ CXWindowsScreen::addTimer(IJob* job, double timeout)
 {
 	CLock lock(&m_timersMutex);
 	removeTimerNoLock(job);
-	m_timers.push(CTimer(job, timeout));
+	m_timers.push(CTimer(job, m_time.getTime(), timeout));
 }
 
 void
@@ -172,6 +177,15 @@ CXWindowsScreen::removeTimerNoLock(IJob* job)
 	m_timers.swap(tmp);
 }
 
+UInt32
+CXWindowsScreen::addOneShotTimer(double timeout)
+{
+	CLock lock(&m_timersMutex);
+	// FIXME -- support multiple one-shot timers
+	m_oneShotTimer = new CTimer(NULL, m_time.getTime(), timeout);
+	return 0;
+}
+
 void
 CXWindowsScreen::setWindow(Window window)
 {
@@ -262,19 +276,27 @@ CXWindowsScreen::mainLoop()
 #endif
 	while (!m_stop) {
 		// compute timeout to next timer
+		double dtimeout;
+		{
+			CLock timersLock(&m_timersMutex);
+			dtimeout = (m_timers.empty() ? -1.0 : m_timers.top());
+			if (m_oneShotTimer != NULL &&
+				(dtimeout == -1.0 || *m_oneShotTimer < dtimeout)) {
+				dtimeout = *m_oneShotTimer;
+			}
+		}
 #if HAVE_POLL
-		int timeout = (m_timers.empty() ? -1 :
+		int timeout = static_cast<int>(1000.0 * dtimeout);
-								static_cast<int>(1000.0 * m_timers.top()));
 #else
 		struct timeval timeout;
 		struct timeval* timeoutPtr;
-		if (m_timers.empty()) {
+		if (dtimeout < 0.0) {
 			timeoutPtr = NULL;
 		}
 		else {
-			timeout.tv_sec  = static_cast<int>(m_timers.top());
+			timeout.tv_sec  = static_cast<int>(dtimeout);
 			timeout.tv_usec = static_cast<int>(1.0e+6 *
-									(m_timers.top() - timeout.tv_sec));
+									(dtimeout - timeout.tv_sec));
 			timeoutPtr      = &timeout;
 		}
 
@@ -697,6 +719,7 @@ CXWindowsScreen::createBlankCursor()
 bool
 CXWindowsScreen::processTimers()
 {
+	bool oneShot = false;
 	std::vector<IJob*> jobs;
 	{
 		CLock lock(&m_timersMutex);
@@ -705,10 +728,21 @@ CXWindowsScreen::processTimers()
 		const double time = m_time.getTime();
 
 		// done if no timers have expired
-		if (m_timers.empty() || m_timers.top() > time) {
+		if ((m_oneShotTimer == NULL || *m_oneShotTimer > time) &&
+			(m_timers.empty() || m_timers.top() > time)) {
 			return false;
 		}
 
+		// handle one shot timers
+		if (m_oneShotTimer != NULL) {
+			*m_oneShotTimer -= time;
+			if (*m_oneShotTimer <= 0.0) {
+				delete m_oneShotTimer;
+				m_oneShotTimer = NULL;
+				oneShot = true;
+			}
+		}
+
 		// subtract current time from all timers.  note that this won't
 		// change the order of elements in the priority queue (except
 		// for floating point round off which we'll ignore).
@@ -718,6 +752,7 @@ CXWindowsScreen::processTimers()
 		}
 
 		// process all timers at or below zero, saving the jobs
+		if (!m_timers.empty()) {
 			while (m_timers.top() <= 0.0) {
 				CTimer timer = m_timers.top();
 				jobs.push_back(timer.getJob());
@@ -725,11 +760,19 @@ CXWindowsScreen::processTimers()
 				m_timers.pop();
 				m_timers.push(timer);
 			}
+		}
 
 		// reset the clock
 		m_time.reset();
 	}
 
+	// now notify of the one shot timers
+	if (oneShot) {
+		m_mutex.unlock();
+		m_eventHandler->onOneShotTimerExpired(0);
+		m_mutex.lock();
+	}
+
 	// now run the jobs.  note that if one of these jobs removes
 	// a timer later in the jobs list and deletes that job pointer
 	// then this will crash when it tries to run that job.

lib/platform/CXWindowsScreen.h

@@ -69,6 +69,14 @@ public:
 	*/
 	void				removeTimer(IJob*);
 
+	//! Install a one-shot timer
+	/*!
+	Installs a one-shot timer for \c timeout seconds and returns the
+	id of the timer (which will be passed to the receiver's
+	\c onTimerExpired()).
+	*/
+	UInt32				addOneShotTimer(double timeout);
+
 	//! Set window
 	/*!
 	Set the window (created by the subclass).  This performs some
@@ -216,7 +224,7 @@ private:
 	// a timer priority queue element
 	class CTimer {
 	public:
-		CTimer(IJob* job, double timeout);
+		CTimer(IJob* job, double startTime, double resetTime);
 		~CTimer();
 
 		// manipulators
@@ -242,6 +250,7 @@ private:
 		IJob*			m_job;
 		double			m_timeout;
 		double			m_time;
+		double			m_startTime;
 	};
 
 private:
@@ -278,6 +287,7 @@ private:
 	CTimerPriorityQueue	m_timers;
 	CStopwatch			m_time;
 	CMutex				m_timersMutex;
+	CTimer*				m_oneShotTimer;
 
 	// pointer to (singleton) screen.  this is only needed by
 	// ioErrorHandler().

lib/platform/CXWindowsSecondaryScreen.cpp

@@ -263,6 +263,12 @@ CXWindowsSecondaryScreen::onEvent(CEvent* event)
 	}
 }
 
+void
+CXWindowsSecondaryScreen::onOneShotTimerExpired(UInt32)
+{
+	// ignore
+}
+
 SInt32
 CXWindowsSecondaryScreen::getJumpZoneSize() const
 {

lib/platform/CXWindowsSecondaryScreen.h

@@ -51,6 +51,7 @@ public:
 	virtual void		onScreensaver(bool activated);
 	virtual bool		onPreDispatch(const CEvent* event);
 	virtual bool		onEvent(CEvent* event);
+	virtual void		onOneShotTimerExpired(UInt32 id);
 	virtual SInt32		getJumpZoneSize() const;
 
 protected:

lib/server/CConfig.cpp

@@ -624,6 +624,9 @@ CConfig::getOptionName(OptionID id)
 	if (id == kOptionHeartbeat) {
 		return "heartbeat";
 	}
+	if (id == kOptionScreenSwitchDelay) {
+		return "switchDelay";
+	}
 	return NULL;
 }
 
@@ -659,7 +662,8 @@ CConfig::getOptionValue(OptionID id, OptionValue value)
 			return "none";
 		}
 	}
-	if (id == kOptionHeartbeat) {
+	if (id == kOptionHeartbeat ||
+		id == kOptionScreenSwitchDelay) {
 		return CStringUtil::print("%d", value);
 	}
 
@@ -767,6 +771,9 @@ CConfig::readSectionOptions(std::istream& s)
 		else if (name == "heartbeat") {
 			addOption("", kOptionHeartbeat, parseInt(value));
 		}
+		else if (name == "switchDelay") {
+			addOption("", kOptionScreenSwitchDelay, parseInt(value));
+		}
 		else {
 			throw XConfigRead("unknown argument");
 		}

lib/server/CPrimaryClient.cpp

@@ -63,6 +63,12 @@ CPrimaryClient::reconfigure(UInt32 activeSides)
 	m_screen->reconfigure(activeSides);
 }
 
+UInt32
+CPrimaryClient::addOneShotTimer(double timeout)
+{
+	return m_screen->addOneShotTimer(timeout);
+}
+
 void
 CPrimaryClient::getClipboard(ClipboardID id, CString& data) const
 {

lib/server/CPrimaryClient.h

@@ -59,6 +59,13 @@ public:
 	*/
 	void				reconfigure(UInt32 activeSides);
 
+	//! Install a one-shot timer
+	/*!
+	Installs a one-shot timer for \c timeout seconds and returns the
+	id of the timer (which will be passed to \c onTimerExpired()).
+	*/
+	UInt32				addOneShotTimer(double timeout);
+
 	//@}
 	//! @name accessors
 	//@{

lib/server/CServer.cpp

@@ -59,7 +59,9 @@ CServer::CServer(const CString& serverName) :
 	m_seqNum(0),
 	m_activeSaver(NULL),
 	m_httpServer(NULL),
-	m_httpAvailable(&m_mutex, s_httpMaxSimultaneousRequests)
+	m_httpAvailable(&m_mutex, s_httpMaxSimultaneousRequests),
+	m_switchWaitDelay(0.0),
+	m_switchWaitScreen(NULL)
 {
 	// do nothing
 }
@@ -220,13 +222,18 @@ CServer::setConfig(const CConfig& config)
 	// process global options
 	const CConfig::CScreenOptions* options = m_config.getOptions("");
 	if (options != NULL && options->size() > 0) {
-/*
 		for (CConfig::CScreenOptions::const_iterator index = options->begin();
 									index != options->end(); ++index) {
 			const OptionID id       = index->first;
 			const OptionValue value = index->second;
+			if (id == kOptionScreenSwitchDelay) {
+				m_switchWaitDelay = 1.0e-3 * static_cast<double>(value);
+				if (m_switchWaitDelay < 0.0) {
+					m_switchWaitDelay = 0.0;
+				}
+				clearSwitchWait();
+			}
 		}
-*/
 	}
 
 	// tell primary screen about reconfiguration
@@ -496,6 +503,36 @@ CServer::onScreensaver(bool activated)
 	}
 }
 
+void
+CServer::onOneShotTimerExpired(UInt32 id)
+{
+	CLock lock(&m_mutex);
+
+	// ignore old timer or if there's no jump screen anymore
+	if (m_switchWaitScreen == NULL || id != m_switchWaitTimer) {
+		clearSwitchWait();
+		return;
+	}
+
+	// ignore if mouse is locked to screen
+	if (isLockedToScreenNoLock()) {
+		clearSwitchWait();
+		return;
+	}
+
+	// switch screen
+	switchScreen(m_switchWaitScreen, m_switchWaitX, m_switchWaitY, false);
+}
+
+void
+CServer::clearSwitchWait()
+{
+	if (m_switchWaitScreen != NULL) {
+		LOG((CLOG_DEBUG1 "cancel switch wait"));
+		m_switchWaitScreen = NULL;
+	}
+}
+
 void
 CServer::onKeyDown(KeyID id, KeyModifierMask mask)
 {
@@ -582,11 +619,6 @@ CServer::onMouseMovePrimaryNoLock(SInt32 x, SInt32 y)
 	assert(m_primaryClient != NULL);
 	assert(m_active == m_primaryClient);
 
-	// ignore if mouse is locked to screen
-	if (isLockedToScreenNoLock()) {
-		return false;
-	}
-
 	// get screen shape
 	SInt32 ax, ay, aw, ah;
 	m_active->getShape(ax, ay, aw, ah);
@@ -616,6 +648,7 @@ CServer::onMouseMovePrimaryNoLock(SInt32 x, SInt32 y)
 	}
 	else {
 		// still on local screen
+		clearSwitchWait();
 		return false;
 	}
 
@@ -623,6 +656,27 @@ CServer::onMouseMovePrimaryNoLock(SInt32 x, SInt32 y)
 	// then ignore the move.
 	IClient* newScreen = getNeighbor(m_active, dir, x, y);
 	if (newScreen == NULL) {
+		clearSwitchWait();
+		return false;
+	}
+
+	// if waiting before a switch then prepare to switch later
+	if (m_switchWaitDelay > 0.0) {
+		if (m_switchWaitScreen == NULL || dir != m_switchWaitDir) {
+			m_switchWaitDir    = dir;
+			m_switchWaitScreen = newScreen;
+			m_switchWaitX      = x;
+			m_switchWaitY      = y;
+			m_switchWaitTimer  = m_primaryClient->addOneShotTimer(
+													m_switchWaitDelay);
+			LOG((CLOG_DEBUG1 "waiting to switch"));
+		}
+		return false;
+	}
+
+	// ignore if mouse is locked to screen
+	if (isLockedToScreenNoLock()) {
+		LOG((CLOG_DEBUG1 "locked to screen"));
 		return false;
 	}
 
@@ -667,12 +721,9 @@ CServer::onMouseMoveSecondaryNoLock(SInt32 dx, SInt32 dy)
 	SInt32 ax, ay, aw, ah;
 	m_active->getShape(ax, ay, aw, ah);
 
-	// switch screens if the mouse is outside the screen and not
-	// locked to the screen
-	IClient* newScreen = NULL;
-	if (!isLockedToScreenNoLock()) {
 	// find direction of neighbor
 	EDirection dir;
+	IClient* newScreen = NULL;
 	if (m_x < ax) {
 		dir = kLeft;
 	}
@@ -692,47 +743,88 @@ CServer::onMouseMoveSecondaryNoLock(SInt32 dx, SInt32 dy)
 		dir = kLeft;
 	}
 
-		// get neighbor if we should switch
+	// switch screens if the mouse is outside the screen and not
+	// locked to the screen
+	bool clamp = false;
 	if (newScreen == NULL) {
-			LOG((CLOG_DEBUG1 "leave \"%s\" on %s", m_active->getName().c_str(), CConfig::dirName(dir)));
+		// get neighbor we should switch to
-
-			// get new position or clamp to current screen
 		newScreen = getNeighbor(m_active, dir, m_x, m_y);
+		LOG((CLOG_DEBUG1 "leave \"%s\" on %s", m_active->getName().c_str(), CConfig::dirName(dir)));
 		if (newScreen == NULL) {
-				LOG((CLOG_DEBUG1 "no neighbor; clamping"));
+			LOG((CLOG_DEBUG1 "no neighbor %s", CConfig::dirName(dir)));
-				if (m_x < ax) {
+			clamp = true;
-					m_x = ax;
 		}
-				else if (m_x > ax + aw - 1) {
+		else if (m_switchWaitDelay > 0.0) {
-					m_x = ax + aw - 1;
+			// wait to switch;  prepare to switch later
-				}
+			if (m_switchWaitScreen == NULL || dir != m_switchWaitDir) {
-				if (m_y < ay) {
+				m_switchWaitDir    = dir;
-					m_y = ay;
+				m_switchWaitScreen = newScreen;
-				}
+				m_switchWaitX      = m_x;
-				else if (m_y > ay + ah - 1) {
+				m_switchWaitY      = m_y;
-					m_y = ay + ah - 1;
+				m_switchWaitTimer  = m_primaryClient->addOneShotTimer(
+														m_switchWaitDelay);
+				LOG((CLOG_DEBUG1 "waiting to switch"));
 			}
+
+			// don't try to switch screen now
+			m_x   = xOld + dx;
+			m_y   = yOld + dy;
+			clamp = true;
 		}
+		else if (isLockedToScreenNoLock()) {
+			// clamp to edge when locked to screen
+			LOG((CLOG_DEBUG1 "locked to screen"));
+			clamp = true;
 		}
 	}
 	else {
-		// clamp to edge when locked
+		// on same screen.  if waiting and mouse is not on the border
+		// we're waiting on then stop waiting.
+		if (m_switchWaitScreen != NULL) {
+			bool clearWait;
+			SInt32 zoneSize = m_primaryClient->getJumpZoneSize();
+			switch (m_switchWaitDir) {
+			case kLeft:
+				clearWait = (m_x >= ax + zoneSize);
+				break;
+
+			case kRight:
+				clearWait = (m_x <= ax + aw - 1 - zoneSize);
+				break;
+
+			case kTop:
+				clearWait = (m_y >= ay + zoneSize);
+				break;
+
+			case kBottom:
+				clearWait = (m_y <= ay + ah - 1 + zoneSize);
+				break;
+			}
+			if (clearWait) {
+				clearSwitchWait();
+			}
+		}
+	}
+
+	// clamp mouse to edge
+	if (clamp) {
 		if (m_x < ax) {
 			m_x = ax;
-			LOG((CLOG_DEBUG1 "clamp to left of \"%s\"", m_active->getName().c_str()));
+			LOG((CLOG_DEBUG2 "clamp to left of \"%s\"", m_active->getName().c_str()));
 		}
 		else if (m_x > ax + aw - 1) {
 			m_x = ax + aw - 1;
-			LOG((CLOG_DEBUG1 "clamp to right of \"%s\"", m_active->getName().c_str()));
+			LOG((CLOG_DEBUG2 "clamp to right of \"%s\"", m_active->getName().c_str()));
 		}
 		if (m_y < ay) {
 			m_y = ay;
-			LOG((CLOG_DEBUG1 "clamp to top of \"%s\"", m_active->getName().c_str()));
+			LOG((CLOG_DEBUG2 "clamp to top of \"%s\"", m_active->getName().c_str()));
 		}
 		else if (m_y > ay + ah - 1) {
 			m_y = ay + ah - 1;
-			LOG((CLOG_DEBUG1 "clamp to bottom of \"%s\"", m_active->getName().c_str()));
+			LOG((CLOG_DEBUG2 "clamp to bottom of \"%s\"", m_active->getName().c_str()));
 		}
+		newScreen = NULL;
 	}
 
 	// warp cursor if on same screen
@@ -801,6 +893,9 @@ CServer::switchScreen(IClient* dst, SInt32 x, SInt32 y, bool forScreensaver)
 
 	LOG((CLOG_INFO "switch from \"%s\" to \"%s\" at %d,%d", m_active->getName().c_str(), dst->getName().c_str(), x, y));
 
+	// stop waiting to switch
+	clearSwitchWait();
+
 	// record new position
 	m_x = x;
 	m_y = y;
@@ -1099,6 +1194,11 @@ CServer::closeClients(const CConfig& config)
 				// close that client
 				assert(index2->second != m_primaryClient);
 				index2->second->close();
+
+				// don't switch to it if we planned to
+				if (index2->second == m_switchWaitScreen) {
+					clearSwitchWait();
+				}
 			}
 			else {
 				++index;
@@ -1789,6 +1889,9 @@ CServer::removeConnection(const CString& name)
 		// record new position (center of primary screen)
 		m_primaryClient->getCursorCenter(m_x, m_y);
 
+		// stop waiting to switch if we were
+		clearSwitchWait();
+
 		// don't notify active screen since it probably already disconnected
 		LOG((CLOG_INFO "jump from \"%s\" to \"%s\" at %d,%d", active->getName().c_str(), m_primaryClient->getName().c_str(), m_x, m_y));
 

lib/server/CServer.h

@@ -141,6 +141,7 @@ public:
 
 	// IPrimaryScreenReceiver overrides
 	virtual void		onScreensaver(bool activated);
+	virtual void		onOneShotTimerExpired(UInt32 id);
 	virtual void		onKeyDown(KeyID, KeyModifierMask);
 	virtual void		onKeyUp(KeyID, KeyModifierMask);
 	virtual void		onKeyRepeat(KeyID, KeyModifierMask, SInt32 count);
@@ -197,6 +198,9 @@ private:
 	IClient*			getNeighbor(IClient*, EDirection,
 							SInt32& x, SInt32& y) const;
 
+	// reset switch wait state
+	void				clearSwitchWait();
+
 	// send screen options to \c client
 	void				sendOptions(IClient* client) const;
 
@@ -320,6 +324,12 @@ private:
 	CHTTPServer*		m_httpServer;
 	CCondVar<SInt32>	m_httpAvailable;
 	static const SInt32	s_httpMaxSimultaneousRequests;
+
+	double				m_switchWaitDelay;
+	EDirection			m_switchWaitDir;
+	UInt32				m_switchWaitTimer;
+	IClient*			m_switchWaitScreen;
+	SInt32				m_switchWaitX, m_switchWaitY;
 };
 
 #endif

lib/synergy/CPrimaryScreen.h

@@ -129,6 +129,13 @@ public:
 	*/
 	virtual void		setOptions(const COptionsList& options) = 0;
 
+	//! Install a one-shot timer
+	/*!
+	Installs a one-shot timer for \c timeout seconds and returns the
+	id of the timer.
+	*/
+	virtual UInt32		addOneShotTimer(double timeout) = 0;
+
 	//@}
 	//! @name accessors
 	//@{

lib/synergy/IPrimaryScreenReceiver.h

@@ -34,6 +34,12 @@ public:
 	*/
 	virtual void		onScreensaver(bool activated) = 0;
 
+	//! Notify of one-shot timer expiration
+	/*!
+	Called when a one-shot timer expires.
+	*/
+	virtual void		onOneShotTimerExpired(UInt32 id) = 0;
+
 	// call to notify of events.  onMouseMovePrimary() returns
 	// true iff the mouse enters a jump zone and jumps.
 	//! Notify of key press

lib/synergy/IScreenEventHandler.h

@@ -57,6 +57,12 @@ public:
 	*/
 	virtual bool		onEvent(CEvent* event) = 0;
 
+	//! Notify of one-shot timer expiration
+	/*!
+	Called when a one-shot timer expires.
+	*/
+	virtual void		onOneShotTimerExpired(UInt32 id) = 0;
+
 	//@}
 	//! @name accessors
 	//@{

lib/synergy/OptionTypes.h

@@ -51,6 +51,7 @@ static const OptionID	kOptionModifierMapForAlt     = OPTION_CODE("MMFA");
 static const OptionID	kOptionModifierMapForMeta    = OPTION_CODE("MMFM");
 static const OptionID	kOptionModifierMapForSuper   = OPTION_CODE("MMFR");
 static const OptionID	kOptionHeartbeat             = OPTION_CODE("HART");
+static const OptionID	kOptionScreenSwitchDelay     = OPTION_CODE("SSWT");
 //@}
 
 #undef OPTION_CODE