--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/ExternalClient-Xlib.c	Mon Aug 13 08:45:50 2007 +0200
@@ -0,0 +1,147 @@
+/* External client, raw Xlib version.
+   Copyright (C) 1993, 1994 Sun Microsystems, Inc.
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public
+License as published by the Free Software Foundation; either
+version 2 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with this library; if not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
+
+/* Synched up with: Not in FSF. */
+
+/* Written by Ben Wing, February 1994. */
+
+#include <X11/Xlib.h>
+#include <X11/Xresource.h>
+#include <X11/Xutil.h>
+#include "extw-Xlib.h"
+
+/* this is not a perfect solution, but otherwise we have to include all
+   of the Xt junk */
+
+#define XtGeometryNo 1
+
+#if (XlibSpecificationRelease < 5)
+# define XPointer char *
+#endif
+
+static int context_inited;
+static XContext focus_context;
+
+/* does the specified window have the focus, given that the pointer just
+   entered (or left) the window (according to enter_p)?  This question
+   does not have an obvious answer in X.  (Basically, X sucks.) */
+
+static int
+window_has_focus_p (Display *display, Window win, int enter_p)
+{
+  Window focuswin;
+  int dummy;
+
+  XGetInputFocus(display, &focuswin, &dummy);
+  if (focuswin == PointerRoot)
+    return enter_p;
+  if (focuswin == win)
+    return True;
+  if (!enter_p)
+    return False;
+  do
+    {
+      Status st;
+      Window root_win, parent_win;
+      Window *child_win;
+      int nchild;
+
+      st = XQueryTree(display, win, &root_win, &parent_win, &child_win,
+		      &nchild);
+      if (!st)
+	return False;
+      XFree((XPointer)child_win);
+      if (parent_win == focuswin)
+	return True;
+      if (parent_win == root_win)
+	return False;
+      win = parent_win;
+    }
+  while (1);
+}
+
+  
+/* External entry points when using XLib directly */
+
+void ExternalClientInitialize (Display *display, Window win);
+void
+ExternalClientInitialize (Display *display, Window win)
+{
+  extw_initialize_atoms(display);
+  extw_which_side = extw_client_send;
+  if (!context_inited)
+    {
+      focus_context = XUniqueContext();
+      context_inited = 1;
+    }
+  XSaveContext(display, win, focus_context, 0);
+  XSelectInput(display, win, EnterWindowMask | LeaveWindowMask |
+	       FocusChangeMask);
+}
+
+void ExternalClientEventHandler (Display *display, Window win, XEvent *event);
+void
+ExternalClientEventHandler (Display *display, Window win, XEvent *event)
+{
+  if (win != event->xany.window)
+    return;
+  
+  if (event->type == ClientMessage &&
+      event->xclient.message_type == a_EXTW_NOTIFY &&
+      event->xclient.data.l[0] == extw_shell_send)
+    switch (event->xclient.data.l[1]) {
+    case extw_notify_gm:
+      /* for the moment, just refuse geometry requests. */
+      extw_send_notify_3(display, win, extw_notify_gm, XtGeometryNo, 0, 0);
+      break;
+      
+    case extw_notify_init:
+      extw_send_notify_3(display, win, extw_notify_init, EXTW_TYPE_XLIB, 0, 0);
+      break;
+      
+    case extw_notify_end:
+      XClearArea(display, win, 0, 0, 0, 0, True);
+      break;
+    }
+  else
+    {
+      int focus_status;
+      XPointer current_focus;
+
+      if (event->type == FocusIn)
+	focus_status = 1;
+      else if (event->type == FocusOut)
+	focus_status = 0;
+      else if (event->type == EnterNotify &&
+	       event->xcrossing.detail != NotifyInferior)
+	focus_status = window_has_focus_p(display, win, 1);
+      else if (event->type == LeaveNotify &&
+	       event->xcrossing.detail != NotifyInferior)
+	focus_status = window_has_focus_p(display, win, 0);
+      else
+	return;
+      XFindContext(display, win, focus_context, &current_focus);
+      if (focus_status != (int) current_focus)
+	{
+	  XSaveContext(display, win, focus_context, (XPointer) focus_status);
+	  extw_send_notify_3(display, win, focus_status ?
+			     extw_notify_focus_in : extw_notify_focus_out,
+			     0, 0, 0);
+	}
+    }
+}