source: trunk/third/gnome-core/panel/multiscreen-stuff.c @ 17152

/*
 *   multiscreen-stuff: Xinerama (and in the future multidisplay)
 *   support for the panel
 *
 *   Copyright (C) 2001 George Lebl <jirka@5z.com>
 *
 * 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
 */

#include <config.h>
#include <gnome.h>

#include "panel-include.h"
#include "foobar-widget.h"

#include <X11/X.h>
#include <X11/Xlib.h>
#include <gdk/gdkx.h>
#ifdef HAVE_LIBXINERAMA
#include <X11/extensions/Xinerama.h>
#endif

#include "multiscreen-stuff.h"

/* some globals */
static int              screens = 1;
static GdkRectangle *   rectangles = NULL;
static gboolean         initialized = FALSE;

void
multiscreen_init (void)
{
#ifdef HAVE_LIBXINERAMA
        gboolean have_xinerama = FALSE;
#endif

        if (initialized)
                return;

        if (g_getenv ("FAKE_XINERAMA_PANEL") != NULL) {
                /* fake xinerama setup for debugging */
                screens = 2;
                rectangles = g_new0 (GdkRectangle, 2);
                rectangles[1].x = 0;
                rectangles[1].y = 0;
                rectangles[1].width = gdk_screen_width () / 2;
                rectangles[1].height = gdk_screen_height () / 2;
                rectangles[0].x = gdk_screen_width () / 2;
                rectangles[0].y = gdk_screen_height () / 2;
                rectangles[0].width = gdk_screen_width () - rectangles[0].x;
                rectangles[0].height = gdk_screen_height () - rectangles[0].y;

                initialized = TRUE;

                return;
        }

#ifdef HAVE_LIBXINERAMA
        gdk_flush ();
        gdk_error_trap_push ();
        have_xinerama = XineramaIsActive (GDK_DISPLAY ());
        gdk_flush ();
        if (gdk_error_trap_pop () != 0)
                have_xinerama = FALSE;

        if (have_xinerama) {
                int screen_num, i;
                XineramaScreenInfo *xscreens =
                        XineramaQueryScreens (GDK_DISPLAY (),
                                              &screen_num);


                if (screen_num <= 0) {
                        /* EEEEEK!, should never happen */
                        goto no_xinerama;
                }

                rectangles = g_new0 (GdkRectangle, screen_num);
                screens = screen_num;

                for (i = 0; i < screen_num; i++) {
                        rectangles[i].x = xscreens[i].x_org;
                        rectangles[i].y = xscreens[i].y_org;
                        rectangles[i].width = xscreens[i].width;
                        rectangles[i].height = xscreens[i].height;
                }

                XFree (xscreens);
        } else
#endif
        {
#ifdef HAVE_LIBXINERAMA
no_xinerama:
#endif
                /* no xinerama */
                screens = 1;
                rectangles = g_new0 (GdkRectangle, 1);
                rectangles[0].x = 0;
                rectangles[0].y = 0;
                rectangles[0].width = gdk_screen_width ();
                rectangles[0].height = gdk_screen_height ();
        }

        initialized = TRUE;
}

int
multiscreen_screens (void)
{
        g_return_val_if_fail (initialized, 1);

        return screens;
}

int
multiscreen_x (int screen)
{
        g_return_val_if_fail (initialized, 0);
        g_return_val_if_fail (screen >= 0, 0);

        if (screen < screens)
                return rectangles[screen].x;
        else
                return gdk_screen_width () + 10;
}

int
multiscreen_y (int screen)
{
        g_return_val_if_fail (initialized, 0);
        g_return_val_if_fail (screen >= 0, 0);

        if (screen < screens)
                return rectangles[screen].y;
        else
                return gdk_screen_height () + 10;
}

int
multiscreen_width (int screen)
{
        g_return_val_if_fail (initialized, 0);
        g_return_val_if_fail (screen >= 0, 0);

        if (screen < screens)
                return rectangles[screen].width;
        else
                return gdk_screen_width ();
}

int
multiscreen_height (int screen)
{
        g_return_val_if_fail (initialized, 0);
        g_return_val_if_fail (screen >= 0, 0);

        if (screen < screens)
                return rectangles[screen].height;
        else
                return gdk_screen_height ();
}

int
multiscreen_screen_from_pos (int x, int y)
{
        int i;
        for (i = 0; i < screens; i++) {
                if (x >= rectangles[i].x &&
                    x <= rectangles[i].x + rectangles[i].width &&
                    y >= rectangles[i].y &&
                    y <= rectangles[i].y + rectangles[i].height)
                        return i;
        }
        return -1;
}

int
multiscreen_screen_from_panel (GtkWidget *widget)
{
        g_return_val_if_fail (widget != NULL, 0);
        g_return_val_if_fail (IS_BASEP_WIDGET (widget) ||
                              IS_FOOBAR_WIDGET (widget), 0);
        
        if (IS_BASEP_WIDGET (widget))
                return BASEP_WIDGET (widget)->screen;
        else if (IS_FOOBAR_WIDGET (widget))
                return FOOBAR_WIDGET (widget)->screen;
        else
                return 0;
}