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working-area.c

/*
 * Guifications - The end all, be all, toaster popup plugin
 * Copyright (C) 2003-2004 Gary Kramlich
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*
  2005.07.22 Modified by Hong Jen Yee (PCMan)
  This piece of code detecting working area is got from Guifications, a plug-in for Gaim.
*/

# include <gdk/gdk.h>
# include <gdk/gdkx.h>
# include <X11/Xlib.h>
# include <X11/Xutil.h>
# include <X11/Xatom.h>

gboolean
gf_display_get_workarea(GdkScreen* g_screen, GdkRectangle *rect) {
      Atom xa_desktops, xa_current, xa_workarea, xa_type;
      Display *x_display;
      Window x_root;
      guint32 desktops = 0, current = 0;
      gulong *workareas, len, fill;
      guchar *data;
      gint format;

      GdkDisplay *g_display;
      Screen *x_screen;

      /* get the gdk display */
      g_display = gdk_display_get_default();
      if(!g_display)
            return FALSE;

      /* get the x display from the gdk display */
      x_display = gdk_x11_display_get_xdisplay(g_display);
      if(!x_display)
            return FALSE;

      /* get the x screen from the gdk screen */
      x_screen = gdk_x11_screen_get_xscreen(g_screen);
      if(!x_screen)
            return FALSE;

      /* get the root window from the screen */
      x_root = XRootWindowOfScreen(x_screen);

      /* find the _NET_NUMBER_OF_DESKTOPS atom */
      xa_desktops = XInternAtom(x_display, "_NET_NUMBER_OF_DESKTOPS", True);
      if(xa_desktops == None)
            return FALSE;

      /* get the number of desktops */
      if(XGetWindowProperty(x_display, x_root, xa_desktops, 0, 1, False,
                                      XA_CARDINAL, &xa_type, &format, &len, &fill,
                                      &data) != Success)
      {
            return FALSE;
      }

      if(!data)
            return FALSE;

      desktops = *(guint32 *)data;
      XFree(data);

      /* find the _NET_CURRENT_DESKTOP atom */
      xa_current = XInternAtom(x_display, "_NET_CURRENT_DESKTOP", True);
      if(xa_current == None)
            return FALSE;

      /* get the current desktop */
      if(XGetWindowProperty(x_display, x_root, xa_current, 0, 1, False,
                                      XA_CARDINAL, &xa_type, &format, &len, &fill,
                                      &data) != Success)
      {
            return FALSE;
      }

      if(!data)
            return FALSE;

      current = *(guint32 *)data;
      XFree(data);

      /* find the _NET_WORKAREA atom */
      xa_workarea = XInternAtom(x_display, "_NET_WORKAREA", True);
      if(xa_workarea == None)
            return FALSE;

      if(XGetWindowProperty(x_display, x_root, xa_workarea, 0, (glong)(4 * 32),
                                      False, AnyPropertyType, &xa_type, &format, &len,
                                      &fill, &data) != Success)
      {
            return FALSE;
      }

      /* make sure the type and format are good */
      if(xa_type == None || format == 0)
            return FALSE;

      /* make sure we don't have any leftovers */
      if(fill)
            return FALSE;

      /* make sure len divides evenly by 4 */
      if(len % 4)
            return FALSE;

      /* it's good, lets use it */
      workareas = (gulong *)(guint32 *)data;

      rect->x = (guint32)workareas[current * 4];
      rect->y = (guint32)workareas[current * 4 + 1];
      rect->width = (guint32)workareas[current * 4 + 2];
      rect->height = (guint32)workareas[current * 4 + 3];

      /* clean up our memory */
      XFree(data);

      return TRUE;
}

void get_working_area( GdkScreen* screen, GdkRectangle* area )
{
      if( !gf_display_get_workarea(screen, area) )
      {
            area->x = 0;
            area->y = 0;
            area->width = gdk_screen_width();
            area->height = gdk_screen_height();
      }
}

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