add the new '-remote' option. let the dispatchEvents loop work in 'local' or 'remote' mode.

otk/eventdispatcher.cc

@@ -34,11 +34,32 @@ void EventDispatcher::clearHandler(Window id)
   _map.erase(id);
 }
 
-void EventDispatcher::dispatchEvents(void)
+void EventDispatcher::dispatchEvents(bool remote)
 {
   XEvent e;
 
-  while (XPending(**display)) {
+  while (true) {
+    /*
+      There are slightly different event retrieval semantics here for local (or
+      high bandwidth) versus remote (or low bandwidth) connections to the
+      display/Xserver.
+    */
+    if (remote) {
+      if (!XPending(**display))
+        return;
+    } else {
+      /*
+        This XSync allows for far more compression of events, which makes
+        things like Motion events perform far far better. Since it also means
+        network traffic for every event instead of every X events (where X is
+        the number retrieved at a time), it probably should not be used for
+        setups where Openbox is running on a remote/low bandwidth
+        display/Xserver.
+      */
+      XSync(**display, false);
+      if (!XEventsQueued(**display, QueuedAlready))
+        return;
+    }
     XNextEvent(**display, &e);
 
 #if 0//defined(DEBUG)

otk/eventdispatcher.hh

@@ -19,7 +19,17 @@ public:
   virtual void clearAllHandlers(void);
   virtual void registerHandler(Window id, EventHandler *handler);
   virtual void clearHandler(Window id);
-  virtual void dispatchEvents(void);
+  //! Dispatch events from the X server to the appropriate EventHandlers
+  /*!
+    @param remote Is the Xserver on a remote (low bandwidth) connection or on a
+                  local (high bandwidth) connection. This allows you to specify
+                  'false' in which case slightly different semantics are used
+                  for event retrieval.<br>
+                  The default is 'true' since this should generally be used,
+                  only the Openbox window manager should need to specify
+                  'false' here.
+  */
+  virtual void dispatchEvents(bool remote = true);
 
   inline void setFallbackHandler(EventHandler *fallback)
   { _fallback = fallback; }

src/openbox.cc

@@ -95,6 +95,7 @@ Openbox::Openbox(int argc, char **argv)
   _focused_client = 0;
   _sync = false;
   _single = false;
+  _remote = false;
 
   parseCommandLine(argc, argv);
 
@@ -274,6 +275,8 @@ void Openbox::parseCommandLine(int argc, char **argv)
       _sync = true;
     } else if (arg == "-single") {
       _single = true;
+    } else if (arg == "-remote") {
+      _remote = true;
     } else if (arg == "-version") {
       showVersion();
       ::exit(0);
@@ -305,7 +308,8 @@ void Openbox::showHelp()
   // print program usage and command line options
   printf(_("Usage: %s [OPTIONS...]\n\
   Options:\n\
-  -display <string>  use display connection.\n\
+  -remote            optimize for a remote (low bandwidth) connection to the\n\
+                     display/Xserver.\n\
   -single            run on a single screen (default is to run every one).\n\
   -rc <string>       use alternate resource file.\n\
   -menu <string>     use alternate menu file.\n\
@@ -349,8 +353,10 @@ void Openbox::showHelp()
 void Openbox::eventLoop()
 {
   while (true) {
-    dispatchEvents(); // from otk::EventDispatcher
-    XFlush(**otk::display); // flush here before we go wait for timers
+    dispatchEvents(false); // from otk::EventDispatcher
+//    XFlush(**otk::display); // flush here before we go wait for timers
+                              // .. the XPending() should have done this last
+                              // already, it does a flush when it returns 0
     // don't wait if we're to shutdown
     if (_shutdown) break;
     otk::Timer::dispatchTimers(!_sync); // wait if not in sync mode

src/openbox.hh

@@ -94,6 +94,8 @@ private:
   bool _sync;
   //! Should Openbox run on a single screen or on all available screens?
   bool _single;
+  //! Optimize for a remote/low-bandwidth connection to the display?
+  bool _remote;
 
   //! A list of all managed clients
   ClientMap _clients;