Fixed getting locked to screen after ctrl+alt+del. Also fixed

cursor not being hidden on win32 server when on client screens
(which happened when using low-level hooks).

lib/platform/CMSWindowsPrimaryScreen.cpp

@@ -319,7 +319,8 @@ CMSWindowsPrimaryScreen::CMSWindowsPrimaryScreen(
 	m_threadID(0),
 	m_mark(0),
 	m_markReceived(0),
-	m_lowLevel(false)
+	m_lowLevel(false),
+	m_cursorThread(0)
 {
 	assert(m_receiver != NULL);
 
@@ -787,6 +788,13 @@ CMSWindowsPrimaryScreen::preDestroyWindow(HWND)
 	m_uninstall();
 }
 
+void
+CMSWindowsPrimaryScreen::onAccessibleDesktop()
+{
+	// get the current keyboard state
+	updateKeys();
+}
+
 void
 CMSWindowsPrimaryScreen::onPreMainLoop()
 {
@@ -833,6 +841,18 @@ CMSWindowsPrimaryScreen::onPostClose()
 void
 CMSWindowsPrimaryScreen::onPreEnter()
 {
+	// show cursor if we hid it
+	if (m_cursorThread != 0) {
+		if (m_threadID != m_cursorThread) {
+			AttachThreadInput(m_threadID, m_cursorThread, TRUE);
+		}
+		ShowCursor(TRUE);
+		if (m_threadID != m_cursorThread) {
+			AttachThreadInput(m_threadID, m_cursorThread, FALSE);
+		}
+		m_cursorThread = 0;
+	}
+
 	// enable ctrl+alt+del, alt+tab, etc
 	if (m_is95Family) {
 		DWORD dummy = 0;
@@ -869,6 +889,19 @@ CMSWindowsPrimaryScreen::onPostLeave(bool success)
 			DWORD dummy = 0;
 			SystemParametersInfo(SPI_SETSCREENSAVERRUNNING, TRUE, &dummy, 0);
 		}
+
+		// hide the cursor if using low level hooks
+		if (m_lowLevel) {
+			HWND hwnd      = GetForegroundWindow();
+			m_cursorThread = GetWindowThreadProcessId(hwnd, NULL);
+			if (m_threadID != m_cursorThread) {
+				AttachThreadInput(m_threadID, m_cursorThread, TRUE);
+			}
+			ShowCursor(FALSE);
+			if (m_threadID != m_cursorThread) {
+				AttachThreadInput(m_threadID, m_cursorThread, FALSE);
+			}
+		}
 	}
 }
 
@@ -876,10 +909,13 @@ void
 CMSWindowsPrimaryScreen::createWindow()
 {
 	// open the desktop and the window
-	HWND window = m_screen->openDesktop();
-	if (window == NULL) {
+	m_window = m_screen->openDesktop();
+	if (m_window == NULL) {
 		throw XScreenOpenFailure();
 	}
+
+	// we don't ever want our window to activate
+	EnableWindow(m_window, FALSE);
 }
 
 void
@@ -892,14 +928,25 @@ CMSWindowsPrimaryScreen::destroyWindow()
 bool
 CMSWindowsPrimaryScreen::showWindow()
 {
-	// do nothing.  we don't need to show a window to capture input.
+	// we don't need a window to capture input but we need a window
+	// to hide the cursor when using low-level hooks.  do not try to
+	// take the activation;  we want the currently active window to
+	// stay active.
+	if (m_lowLevel) {
+		SetWindowPos(m_window, HWND_TOPMOST, m_xCenter, m_yCenter, 1, 1,
+							SWP_NOACTIVATE);
+		ShowWindow(m_window, SW_SHOWNA);
+	}
 	return true;
 }
 
 void
 CMSWindowsPrimaryScreen::hideWindow()
 {
-	// do nothing.  we don't need to show a window to capture input.
+	// hide our window
+	if (m_lowLevel) {
+		ShowWindow(m_window, SW_HIDE);
+	}
 }
 
 void

lib/platform/CMSWindowsPrimaryScreen.h

@@ -52,6 +52,7 @@ public:
 	virtual SInt32		getJumpZoneSize() const;
 	virtual void		postCreateWindow(HWND);
 	virtual void		preDestroyWindow(HWND);
+	virtual void		onAccessibleDesktop();
 
 protected:
 	// CPrimaryScreen overrides
@@ -101,6 +102,9 @@ private:
 	// the main loop's thread id
 	DWORD				m_threadID;
 
+	// my window
+	HWND				m_window;
+
 	// used to discard queued messages that are no longer needed
 	UInt32				m_mark;
 	UInt32				m_markReceived;
@@ -128,10 +132,8 @@ private:
 	SetRelayFunc		m_setRelay;
 	bool				m_lowLevel;
 
-	// stuff for restoring active window
-	HWND				m_lastForegroundWindow;
-	HWND				m_lastActiveWindow;
-	DWORD				m_lastActiveThread;
+	// stuff for hiding the cursor
+	DWORD				m_cursorThread;
 };
 
 #endif

lib/platform/CMSWindowsScreen.cpp

@@ -68,7 +68,8 @@ CMSWindowsScreen::CMSWindowsScreen(IScreenReceiver* receiver,
 	m_installScreensaver(NULL),
 	m_uninstallScreensaver(NULL),
 	m_screensaver(NULL),
-	m_screensaverNotify(false)
+	m_screensaverNotify(false),
+	m_inaccessibleDesktop(false)
 {
 	assert(s_screen       == NULL);
 	assert(m_receiver     != NULL);
@@ -384,7 +385,7 @@ CMSWindowsScreen::syncDesktop()
 	// of sucking up more and more CPU each time it's called (even if
 	// the threads are already attached).  since we only expect one
 	// thread to call this more than once we can save just the last
-	// the attached thread.
+	// attached thread.
 	DWORD threadID = GetCurrentThreadId();
 	if (threadID != m_lastThreadID && threadID != m_threadID) {
 		m_lastThreadID = threadID;
@@ -493,16 +494,27 @@ CMSWindowsScreen::onPreDispatch(const CEvent* event)
 					if (isCurrentDesktop(desk)) {
 						CloseDesktop(desk);
 					}
-					else if (!m_screensaver->isActive()) {
+					else if (m_screensaver->isActive()) {
 						// don't switch desktops when the screensaver is
 						// active.  we'd most likely switch to the
 						// screensaver desktop which would have the side
 						// effect of forcing the screensaver to stop.
-						switchDesktop(desk);
-					}
-					else {
 						CloseDesktop(desk);
 					}
+					else {
+						switchDesktop(desk);
+					}
+
+					// if the desktop was inaccessible then notify the
+					// event handler of that.
+					if (m_inaccessibleDesktop) {
+						m_inaccessibleDesktop = false;
+						m_eventHandler->onAccessibleDesktop();
+					}
+				}
+				else if (!m_inaccessibleDesktop) {
+					// the desktop has become inaccessible
+					m_inaccessibleDesktop = true;
 				}
 			}
 

lib/platform/CMSWindowsScreen.h

@@ -191,6 +191,13 @@ private:
 	CMSWindowsScreenSaver*		m_screensaver;
 	bool						m_screensaverNotify;
 
+	// true when the current desktop is inaccessible.  while
+	// the desktop is inaccessible we won't receive user input
+	// and we'll lose track of the keyboard state.  when the
+	// desktop becomes accessible again we'll notify the event
+	// handler of that.
+	bool				m_inaccessibleDesktop;
+
 	static CMSWindowsScreen*	s_screen;
 };
 

lib/platform/CMSWindowsSecondaryScreen.cpp

@@ -417,6 +417,13 @@ CMSWindowsSecondaryScreen::preDestroyWindow(HWND)
 	// do nothing
 }
 
+void
+CMSWindowsSecondaryScreen::onAccessibleDesktop()
+{
+	// get the current keyboard state
+	updateKeys();
+}
+
 void
 CMSWindowsSecondaryScreen::onPreMainLoop()
 {

lib/platform/CMSWindowsSecondaryScreen.h

@@ -59,6 +59,7 @@ public:
 	virtual SInt32		getJumpZoneSize() const;
 	virtual void		postCreateWindow(HWND);
 	virtual void		preDestroyWindow(HWND);
+	virtual void		onAccessibleDesktop();
 
 protected:
 	// CSecondaryScreen overrides

lib/platform/CSynergyHook.cpp

@@ -111,10 +111,17 @@ void
 hideCursor(DWORD thread)
 {
 	// we should be running the context of the window who's cursor
-	// we want to hide so we shouldn't have to attach thread input.
-	g_cursor       = GetCursor();
+	// we want to hide so we shouldn't have to attach thread input
+	// but we'll check to make sure.
 	g_cursorThread = thread;
-	SetCursor(NULL);
+	if (g_cursorThread != 0) {
+		DWORD myThread = GetCurrentThreadId();
+		if (myThread != g_cursorThread)
+			AttachThreadInput(myThread, g_cursorThread, TRUE);
+		g_cursor = SetCursor(NULL);
+		if (myThread != g_cursorThread)
+			AttachThreadInput(myThread, g_cursorThread, FALSE);
+	}
 }
 
 static

lib/platform/IMSWindowsScreenEventHandler.h

@@ -37,6 +37,13 @@ public:
 	*/
 	virtual void		preDestroyWindow(HWND) = 0;
 
+	//! Notify of newly accessible desktop
+	/*!
+	This is called when the user switched from an inaccessible desktop
+	to an accessible desktop.
+	*/
+	virtual void		onAccessibleDesktop() = 0;
+
 	//@}
 
 	// IScreenEventHandler overrides

lib/synergy/CPrimaryScreen.cpp

@@ -172,12 +172,12 @@ CPrimaryScreen::leave()
 	// get keyboard state as we leave
 	updateKeys();
 
-	// subclass hook
-	onPostLeave(true);
-
 	// warp mouse to center
 	warpCursorToCenter();
 
+	// subclass hook
+	onPostLeave(true);
+
 	// local client now active
 	m_active = true;