added support for locking to a screen when the sroll lock is

toggled on or when any key or button is pressed.  fully
implemented on X but stubbed out for now on win32.

server/CMSWindowsPrimaryScreen.cpp

@@ -255,6 +255,12 @@ KeyModifierMask			CMSWindowsPrimaryScreen::getToggleMask() const
 	return mask;
 }
 
+bool					CMSWindowsPrimaryScreen::isLockedToScreen() const
+{
+	// FIXME
+	return false;
+}
+
 void					CMSWindowsPrimaryScreen::onOpenDisplay()
 {
 	assert(m_window == NULL);

server/CMSWindowsPrimaryScreen.h

@@ -27,6 +27,7 @@ public:
 	virtual SInt32		getJumpZoneSize() const;
 	virtual void		getClipboard(ClipboardID, IClipboard*) const;
 	virtual KeyModifierMask	getToggleMask() const;
+	virtual bool		isLockedToScreen() const;
 
 protected:
 	// CMSWindowsScreen overrides

server/CServer.cpp

@@ -489,7 +489,17 @@ void					CServer::onMouseWheel(SInt32 delta)
 
 bool					CServer::isLockedToScreen() const
 {
-	// FIXME
+	// locked if primary says we're locked
+	if (m_primary->isLockedToScreen()) {
+		return true;
+	}
+
+	// locked if scroll-lock is toggled on
+	if ((m_primary->getToggleMask() & KeyModifierScrollLock) != 0) {
+		return true;
+	}
+
+	// not locked
 	return false;
 }
 

server/CXWindowsPrimaryScreen.cpp

@@ -424,8 +424,9 @@ KeyModifierMask			CXWindowsPrimaryScreen::getToggleMask() const
 	int xRoot, yRoot, xWindow, yWindow;
 	unsigned int state;
 	if (!XQueryPointer(display, m_window, &root, &window,
-								&xRoot, &yRoot, &xWindow, &yWindow, &state))
+								&xRoot, &yRoot, &xWindow, &yWindow, &state)) {
 		return 0;
+	}
 
 	// convert to KeyModifierMask
 	KeyModifierMask mask = 0;
@@ -439,6 +440,38 @@ KeyModifierMask			CXWindowsPrimaryScreen::getToggleMask() const
 	return mask;
 }
 
+bool					CXWindowsPrimaryScreen::isLockedToScreen() const
+{
+	CDisplayLock display(this);
+
+	// query the pointer to get the button state
+	Window root, window;
+	int xRoot, yRoot, xWindow, yWindow;
+	unsigned int state;
+	if (XQueryPointer(display, m_window, &root, &window,
+								&xRoot, &yRoot, &xWindow, &yWindow, &state)) {
+		if ((state & (Button1Mask | Button2Mask | Button3Mask |
+								Button4Mask | Button5Mask)) != 0) {
+			return true;
+		}
+	}
+
+	// get logical keyboard state
+	char keyMap[32];
+	memset(keyMap, 0, sizeof(keyMap));
+	XQueryKeymap(display, keyMap);
+
+	// locked if any key is down
+	for (unsigned int i = 0; i < sizeof(keyMap); ++i) {
+		if (keyMap[i] != 0) {
+			return true;
+		}
+	}
+
+	// not locked
+	return false;
+}
+
 void					CXWindowsPrimaryScreen::onOpenDisplay()
 {
 	assert(m_window == None);

server/CXWindowsPrimaryScreen.h

@@ -25,6 +25,7 @@ public:
 	virtual SInt32		getJumpZoneSize() const;
 	virtual void		getClipboard(ClipboardID, IClipboard*) const;
 	virtual KeyModifierMask	getToggleMask() const;
+	virtual bool		isLockedToScreen() const;
 
 protected:
 	// CXWindowsScreen overrides

synergy/IPrimaryScreen.h

@@ -84,6 +84,11 @@ public:
 	// the returned mask should have the corresponding bit set for
 	// each toggle key that is active.
 	virtual KeyModifierMask	getToggleMask() const = 0;
+
+	// return true if any key or button is being pressed or if there's
+	// any other reason that the user should not be allowed to switch
+	// screens.
+	virtual bool		isLockedToScreen() const = 0;
 };
 
 #endif