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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */

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/* Metacity X screen handler */

/* 
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 * Copyright (C) 2001, 2002 Havoc Pennington
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 * Copyright (C) 2002, 2003 Red Hat Inc.
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 * Some ICCCM manager selection code derived from fvwm2,
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 * Copyright (C) 2001 Dominik Vogt, Matthias Clasen, and fvwm2 team
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 * Copyright (C) 2003 Rob Adams
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 * Copyright (C) 2004-2006 Elijah Newren
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 * 
 * 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.
 */
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#include <config.h>
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#include "screen.h"
#include "util.h"
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#include "errors.h"
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#include "window.h"
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#include "frame.h"
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#include "prefs.h"
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#include "workspace.h"
#include "keybindings.h"
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#include "stack.h"
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#include "xprops.h"
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#include "compositor.h"
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#ifdef HAVE_SOLARIS_XINERAMA
#include <X11/extensions/xinerama.h>
#endif
#ifdef HAVE_XFREE_XINERAMA
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#include <X11/extensions/Xinerama.h>
#endif

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#include <X11/Xatom.h>
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#include <locale.h>
#include <string.h>
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#include <stdio.h>
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static char* get_screen_name (MetaDisplay *display,
                              int          number);

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static void update_num_workspaces  (MetaScreen *screen,
                                    guint32     timestamp);
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static void update_focus_mode      (MetaScreen *screen);
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static void set_workspace_names    (MetaScreen *screen);
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static void prefs_changed_callback (MetaPreference pref,
                                    gpointer       data);
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static void set_desktop_geometry_hint (MetaScreen *screen);
static void set_desktop_viewport_hint (MetaScreen *screen);

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#ifdef HAVE_STARTUP_NOTIFICATION
static void meta_screen_sn_event   (SnMonitorEvent *event,
                                    void           *user_data);
#endif

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static int
set_wm_check_hint (MetaScreen *screen)
{
  unsigned long data[1];

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  g_return_val_if_fail (screen->display->leader_window != None, 0);
  
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  data[0] = screen->display->leader_window;

  XChangeProperty (screen->display->xdisplay, screen->xroot,
                   screen->display->atom_net_supporting_wm_check,
                   XA_WINDOW,
                   32, PropModeReplace, (guchar*) data, 1);
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  return Success;
}

static int
set_supported_hint (MetaScreen *screen)
{
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#define N_SUPPORTED 59
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  Atom atoms[N_SUPPORTED];
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  atoms[0] = screen->display->atom_net_wm_name;
  atoms[1] = screen->display->atom_net_close_window;
  atoms[2] = screen->display->atom_net_wm_state;
  atoms[3] = screen->display->atom_net_wm_state_shaded;
  atoms[4] = screen->display->atom_net_wm_state_maximized_vert;
  atoms[5] = screen->display->atom_net_wm_state_maximized_horz;
  atoms[6] = screen->display->atom_net_wm_desktop;
  atoms[7] = screen->display->atom_net_number_of_desktops;
  atoms[8] = screen->display->atom_net_current_desktop;
  atoms[9] = screen->display->atom_net_wm_window_type;
  atoms[10] = screen->display->atom_net_wm_window_type_desktop;
  atoms[11] = screen->display->atom_net_wm_window_type_dock;
  atoms[12] = screen->display->atom_net_wm_window_type_toolbar;
  atoms[13] = screen->display->atom_net_wm_window_type_menu;
  atoms[14] = screen->display->atom_net_wm_window_type_dialog;
  atoms[15] = screen->display->atom_net_wm_window_type_normal;
  atoms[16] = screen->display->atom_net_wm_state_modal;
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  atoms[17] = screen->display->atom_net_client_list;
  atoms[18] = screen->display->atom_net_client_list_stacking;
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  atoms[19] = screen->display->atom_net_wm_state_skip_taskbar;
  atoms[20] = screen->display->atom_net_wm_state_skip_pager;
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  atoms[21] = screen->display->atom_net_wm_icon_name;
  atoms[22] = screen->display->atom_net_wm_icon;
  atoms[23] = screen->display->atom_net_wm_icon_geometry;
  atoms[24] = screen->display->atom_net_wm_moveresize;
  atoms[25] = screen->display->atom_net_active_window;
  atoms[26] = screen->display->atom_net_wm_strut;
  atoms[27] = screen->display->atom_net_wm_state_hidden;
  atoms[28] = screen->display->atom_net_wm_window_type_utility;
  atoms[29] = screen->display->atom_net_wm_window_type_splash;
  atoms[30] = screen->display->atom_net_wm_state_fullscreen;
  atoms[31] = screen->display->atom_net_wm_ping;
  atoms[32] = screen->display->atom_net_wm_pid;
  atoms[33] = screen->display->atom_net_workarea;
  atoms[34] = screen->display->atom_net_showing_desktop;
  atoms[35] = screen->display->atom_net_desktop_layout;
  atoms[36] = screen->display->atom_net_desktop_names;
  atoms[37] = screen->display->atom_net_wm_allowed_actions;
  atoms[38] = screen->display->atom_net_wm_action_move;
  atoms[39] = screen->display->atom_net_wm_action_resize;
  atoms[40] = screen->display->atom_net_wm_action_shade;
  atoms[41] = screen->display->atom_net_wm_action_stick;
  atoms[42] = screen->display->atom_net_wm_action_maximize_horz;
  atoms[43] = screen->display->atom_net_wm_action_maximize_vert;
  atoms[44] = screen->display->atom_net_wm_action_change_desktop;
  atoms[45] = screen->display->atom_net_wm_action_close;
  atoms[46] = screen->display->atom_net_wm_state_above;
  atoms[47] = screen->display->atom_net_wm_state_below;
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  atoms[48] = screen->display->atom_net_startup_id;
  atoms[49] = screen->display->atom_net_wm_strut_partial;
  atoms[50] = screen->display->atom_net_wm_action_fullscreen;
  atoms[51] = screen->display->atom_net_wm_action_minimize;
  atoms[52] = screen->display->atom_net_frame_extents;
  atoms[53] = screen->display->atom_net_request_frame_extents;
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  atoms[54] = screen->display->atom_net_wm_user_time;
  atoms[55] = screen->display->atom_net_wm_state_demands_attention;
  atoms[56] = screen->display->atom_net_desktop_geometry;
  atoms[57] = screen->display->atom_net_desktop_viewport;
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  atoms[58] = screen->display->atom_net_wm_user_time_window;
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  //atoms[58] = screen->display->atom_net_restack_window;
  //atoms[59] = screen->display->atom_net_moveresize_window;
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  XChangeProperty (screen->display->xdisplay, screen->xroot,
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                   screen->display->atom_net_supported,
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                   XA_ATOM,
                   32, PropModeReplace, (guchar*) atoms, N_SUPPORTED);
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  return Success;
#undef N_SUPPORTED
}

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static int
set_wm_icon_size_hint (MetaScreen *screen)
{
#define N_VALS 6
  gulong vals[N_VALS];

  /* min width, min height, max w, max h, width inc, height inc */
  vals[0] = META_ICON_WIDTH;
  vals[1] = META_ICON_HEIGHT;
  vals[2] = META_ICON_WIDTH;
  vals[3] = META_ICON_HEIGHT;
  vals[4] = 0;
  vals[5] = 0;
  
  XChangeProperty (screen->display->xdisplay, screen->xroot,
                   screen->display->atom_wm_icon_size,
                   XA_CARDINAL,
                   32, PropModeReplace, (guchar*) vals, N_VALS);
  
  return Success;
#undef N_VALS
}

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static void
reload_xinerama_infos (MetaScreen *screen)
{
  MetaDisplay *display;

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  {
    GList *tmp;

    tmp = screen->workspaces;
    while (tmp != NULL)
      {
        MetaWorkspace *space = tmp->data;

        meta_workspace_invalidate_work_area (space);
        
        tmp = tmp->next;
      }
  }

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  display = screen->display;
  
  if (screen->xinerama_infos)
    g_free (screen->xinerama_infos);
  
  screen->xinerama_infos = NULL;
  screen->n_xinerama_infos = 0;
  screen->last_xinerama_index = 0;

  screen->display->xinerama_cache_invalidated = TRUE;
  
#ifdef HAVE_XFREE_XINERAMA
  if (XineramaIsActive (display->xdisplay))
    {
      XineramaScreenInfo *infos;
      int n_infos;
      int i;
      
      n_infos = 0;
      infos = XineramaQueryScreens (display->xdisplay, &n_infos);

      meta_topic (META_DEBUG_XINERAMA,
                  "Found %d Xinerama screens on display %s\n",
                  n_infos, display->name);

      if (n_infos > 0)
        {
          screen->xinerama_infos = g_new (MetaXineramaScreenInfo, n_infos);
          screen->n_xinerama_infos = n_infos;
          
          i = 0;
          while (i < n_infos)
            {
              screen->xinerama_infos[i].number = infos[i].screen_number;
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              screen->xinerama_infos[i].rect.x = infos[i].x_org;
              screen->xinerama_infos[i].rect.y = infos[i].y_org;
              screen->xinerama_infos[i].rect.width = infos[i].width;
              screen->xinerama_infos[i].rect.height = infos[i].height;
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              meta_topic (META_DEBUG_XINERAMA,
                          "Xinerama %d is %d,%d %d x %d\n",
                          screen->xinerama_infos[i].number,
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                          screen->xinerama_infos[i].rect.x,
                          screen->xinerama_infos[i].rect.y,
                          screen->xinerama_infos[i].rect.width,
                          screen->xinerama_infos[i].rect.height);
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              ++i;
            }
        }
      
      meta_XFree (infos);
    }
  else
    {
      meta_topic (META_DEBUG_XINERAMA,
                  "No XFree86 Xinerama extension or XFree86 Xinerama inactive on display %s\n",
                  display->name);
    }
#else
  meta_topic (META_DEBUG_XINERAMA,
              "Metacity compiled without XFree86 Xinerama support\n");
#endif /* HAVE_XFREE_XINERAMA */

#ifdef HAVE_SOLARIS_XINERAMA
  /* This code from GDK, Copyright (C) 2002 Sun Microsystems */
  if (screen->n_xinerama_infos == 0 &&
      XineramaGetState (screen->display->xdisplay,
                        screen->number))
    {
      XRectangle monitors[MAXFRAMEBUFFERS];
      unsigned char hints[16];
      int result;
      int n_monitors;
      int i;

      n_monitors = 0;
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      result = XineramaGetInfo (screen->display->xdisplay,
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                                screen->number,
				monitors, hints,
                                &n_monitors);
      /* Yes I know it should be Success but the current implementation 
       * returns the num of monitor
       */
      if (result > 0)
	{
          g_assert (n_monitors > 0);
          
          screen->xinerama_infos = g_new (MetaXineramaScreenInfo, n_monitors);
          screen->n_xinerama_infos = n_monitors;
          
          i = 0;
          while (i < n_monitors)
            {
              screen->xinerama_infos[i].number = i;
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              screen->xinerama_infos[i].rect.x = monitors[i].x;
              screen->xinerama_infos[i].rect.y = monitors[i].y;
              screen->xinerama_infos[i].rect.width = monitors[i].width;
              screen->xinerama_infos[i].rect.height = monitors[i].height;
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              meta_topic (META_DEBUG_XINERAMA,
                          "Xinerama %d is %d,%d %d x %d\n",
                          screen->xinerama_infos[i].number,
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                          screen->xinerama_infos[i].rect.x,
                          screen->xinerama_infos[i].rect.y,
                          screen->xinerama_infos[i].rect.width,
                          screen->xinerama_infos[i].rect.height);              
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              ++i;
            }
	}
    }
  else if (screen->n_xinerama_infos == 0)
    {
      meta_topic (META_DEBUG_XINERAMA,
                  "No Solaris Xinerama extension or Solaris Xinerama inactive on display %s\n",
                  display->name);
    }
#else
  meta_topic (META_DEBUG_XINERAMA,
              "Metacity compiled without Solaris Xinerama support\n");
#endif /* HAVE_SOLARIS_XINERAMA */

  
  /* If no Xinerama, fill in the single screen info so
   * we can use the field unconditionally
   */
  if (screen->n_xinerama_infos == 0)
    {
      if (g_getenv ("METACITY_DEBUG_XINERAMA"))
        {
          meta_topic (META_DEBUG_XINERAMA,
                      "Pretending a single monitor has two Xinerama screens\n");
          
          screen->xinerama_infos = g_new (MetaXineramaScreenInfo, 2);
          screen->n_xinerama_infos = 2;
          
          screen->xinerama_infos[0].number = 0;
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          screen->xinerama_infos[0].rect = screen->rect;
          screen->xinerama_infos[0].rect.width = screen->rect.width / 2;
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          screen->xinerama_infos[1].number = 1;
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          screen->xinerama_infos[1].rect = screen->rect;
          screen->xinerama_infos[1].rect.x = screen->rect.width / 2;
          screen->xinerama_infos[1].rect.width = screen->rect.width / 2;
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        }
      else
        {
          meta_topic (META_DEBUG_XINERAMA,
                      "No Xinerama screens, using default screen info\n");
          
          screen->xinerama_infos = g_new (MetaXineramaScreenInfo, 1);
          screen->n_xinerama_infos = 1;
          
          screen->xinerama_infos[0].number = 0;
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          screen->xinerama_infos[0].rect = screen->rect;
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        }
    }

  g_assert (screen->n_xinerama_infos > 0);
  g_assert (screen->xinerama_infos != NULL);
}

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MetaScreen*
meta_screen_new (MetaDisplay *display,
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                 int          number,
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                 guint32      timestamp)
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{
  MetaScreen *screen;
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  Window xroot;
  Display *xdisplay;
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  XWindowAttributes attr;
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  Window new_wm_sn_owner;
  Window current_wm_sn_owner;
  gboolean replace_current_wm;
  Atom wm_sn_atom;
  char buf[128];
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  guint32 manager_timestamp;
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  gulong current_workspace;
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  replace_current_wm = meta_get_replace_current_wm ();
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  /* Only display->name, display->xdisplay, and display->error_traps
   * can really be used in this function, since normally screens are
   * created from the MetaDisplay constructor
   */
  
  xdisplay = display->xdisplay;
  
  meta_verbose ("Trying screen %d on display '%s'\n",
                number, display->name);

  xroot = RootWindow (xdisplay, number);

  /* FVWM checks for None here, I don't know if this
   * ever actually happens
   */
  if (xroot == None)
    {
      meta_warning (_("Screen %d on display '%s' is invalid\n"),
                    number, display->name);
      return NULL;
    }

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  sprintf (buf, "WM_S%d", number);
  wm_sn_atom = XInternAtom (xdisplay, buf, False);  
  
  current_wm_sn_owner = XGetSelectionOwner (xdisplay, wm_sn_atom);

  if (current_wm_sn_owner != None)
    {
      XSetWindowAttributes attrs;
      
      if (!replace_current_wm)
        {
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          meta_warning (_("Screen %d on display \"%s\" already has a window manager; try using the --replace option to replace the current window manager.\n"),
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                        number, display->name);

          return NULL;
        }

      /* We want to find out when the current selection owner dies */
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      meta_error_trap_push_with_return (display);
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      attrs.event_mask = StructureNotifyMask;
      XChangeWindowAttributes (xdisplay,
                               current_wm_sn_owner, CWEventMask, &attrs);
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      if (meta_error_trap_pop_with_return (display, FALSE) != Success)
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        current_wm_sn_owner = None; /* don't wait for it to die later on */
    }

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  new_wm_sn_owner = meta_create_offscreen_window (xdisplay, xroot);
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  manager_timestamp = timestamp;
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  XSetSelectionOwner (xdisplay, wm_sn_atom, new_wm_sn_owner,
                      manager_timestamp);

  if (XGetSelectionOwner (xdisplay, wm_sn_atom) != new_wm_sn_owner)
    {
      meta_warning (_("Could not acquire window manager selection on screen %d display \"%s\"\n"),
                    number, display->name);

      XDestroyWindow (xdisplay, new_wm_sn_owner);
      
      return NULL;
    }
  
  {
    /* Send client message indicating that we are now the WM */
    XClientMessageEvent ev;
    
    ev.type = ClientMessage;
    ev.window = xroot;
    ev.message_type = display->atom_manager;
    ev.format = 32;
    ev.data.l[0] = manager_timestamp;
    ev.data.l[1] = wm_sn_atom;

    XSendEvent (xdisplay, xroot, False, StructureNotifyMask, (XEvent*)&ev);
  }

  /* Wait for old window manager to go away */
  if (current_wm_sn_owner != None)
    {
      XEvent event;

      /* We sort of block infinitely here which is probably lame. */
      
      meta_verbose ("Waiting for old window manager to exit\n");
      do
        {
          XWindowEvent (xdisplay, current_wm_sn_owner,
                        StructureNotifyMask, &event);
        }
      while (event.type != DestroyNotify);
    }
  
  /* select our root window events */
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  meta_error_trap_push_with_return (display);
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  /* We need to or with the existing event mask since
   * gtk+ may be interested in other events.
   */
  XGetWindowAttributes (xdisplay, xroot, &attr);
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  XSelectInput (xdisplay,
                xroot,
                SubstructureRedirectMask | SubstructureNotifyMask |
                ColormapChangeMask | PropertyChangeMask |
                LeaveWindowMask | EnterWindowMask |
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                KeyPressMask | KeyReleaseMask |
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                FocusChangeMask | StructureNotifyMask |
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#ifdef HAVE_COMPOSITE_EXTENSIONS
                ExposureMask |
#endif
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		attr.your_event_mask);
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  if (meta_error_trap_pop_with_return (display, FALSE) != Success)
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    {
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      meta_warning (_("Screen %d on display \"%s\" already has a window manager\n"),
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                    number, display->name);
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      XDestroyWindow (xdisplay, new_wm_sn_owner);
      
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      return NULL;
    }
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  screen = g_new (MetaScreen, 1);
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  screen->closing = 0;
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  screen->display = display;
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  screen->number = number;
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  screen->screen_name = get_screen_name (display, number);
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  screen->xscreen = ScreenOfDisplay (xdisplay, number);
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  screen->xroot = xroot;
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  screen->rect.x = screen->rect.y = 0;
  screen->rect.width = WidthOfScreen (screen->xscreen);
  screen->rect.height = HeightOfScreen (screen->xscreen);
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  screen->current_cursor = -1; /* invalid/unset */
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  screen->default_xvisual = DefaultVisualOfScreen (screen->xscreen);
  screen->default_depth = DefaultDepthOfScreen (screen->xscreen);
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  screen->flash_window = None;
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  screen->wm_sn_selection_window = new_wm_sn_owner;
  screen->wm_sn_atom = wm_sn_atom;
  screen->wm_sn_timestamp = manager_timestamp;
  
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  screen->work_area_idle = 0;
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  screen->active_workspace = NULL;
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  screen->workspaces = NULL;
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  screen->rows_of_workspaces = 1;
  screen->columns_of_workspaces = -1;
  screen->vertical_workspaces = FALSE;
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  screen->starting_corner = META_SCREEN_TOPLEFT;
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  screen->compositor_data = NULL;
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  {
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    XFontStruct *font_info;
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    XGCValues gc_values;
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    gulong value_mask = 0;
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    gc_values.subwindow_mode = IncludeInferiors;
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    value_mask |= GCSubwindowMode;
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    gc_values.function = GXinvert;
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    value_mask |= GCFunction;
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    gc_values.line_width = META_WIREFRAME_XOR_LINE_WIDTH;
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    value_mask |= GCLineWidth;

    font_info = XLoadQueryFont (screen->display->xdisplay, "fixed");

    if (font_info != NULL)
      {
        gc_values.font = font_info->fid;
        value_mask |= GCFont;
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        XFreeFontInfo (NULL, font_info, 1);
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      }
    else
      meta_warning ("xserver doesn't have 'fixed' font.\n");

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    screen->root_xor_gc = XCreateGC (screen->display->xdisplay,
                                     screen->xroot,
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                                     value_mask,
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                                     &gc_values);
  }
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  screen->xinerama_infos = NULL;
  screen->n_xinerama_infos = 0;
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  screen->last_xinerama_index = 0;  
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  reload_xinerama_infos (screen);
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  meta_screen_set_cursor (screen, META_CURSOR_DEFAULT);
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  /* Handle creating a no_focus_window for this screen */  
  screen->no_focus_window = meta_create_offscreen_window (display->xdisplay,
                                                          screen->xroot);
  XSelectInput (display->xdisplay, screen->no_focus_window,
                FocusChangeMask | KeyPressMask | KeyReleaseMask);
  XMapWindow (display->xdisplay, screen->no_focus_window);
  /* Done with no_focus_window stuff */
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  set_wm_icon_size_hint (screen);
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  set_supported_hint (screen);
  
  set_wm_check_hint (screen);
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  set_desktop_viewport_hint (screen);

  set_desktop_geometry_hint (screen);

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  meta_screen_update_workspace_layout (screen);
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  /* Get current workspace */
  current_workspace = 0;
  if (meta_prop_get_cardinal (screen->display,
                              screen->xroot,
                              screen->display->atom_net_current_desktop,
                              &current_workspace))
    meta_verbose ("Read existing _NET_CURRENT_DESKTOP = %d\n",
                  (int) current_workspace);
  else
    meta_verbose ("No _NET_CURRENT_DESKTOP present\n");
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  /* Screens must have at least one workspace at all times,
   * so create that required workspace.
   */
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  meta_workspace_activate (meta_workspace_new (screen), timestamp);
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  update_num_workspaces (screen, timestamp);
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  set_workspace_names (screen);

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  screen->all_keys_grabbed = FALSE;
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  screen->keys_grabbed = FALSE;
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  meta_screen_grab_keys (screen);
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  screen->ui = meta_ui_new (screen->display->xdisplay,
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                            screen->xscreen);
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  screen->tab_popup = NULL;
  
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  screen->stack = meta_stack_new (screen);
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  meta_prefs_add_listener (prefs_changed_callback, screen);
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#ifdef HAVE_STARTUP_NOTIFICATION
  screen->sn_context =
    sn_monitor_context_new (screen->display->sn_display,
                            screen->number,
                            meta_screen_sn_event,
                            screen,
                            NULL);
  screen->startup_sequences = NULL;
  screen->startup_sequence_timeout = 0;
#endif
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  /* Switch to the _NET_CURRENT_DESKTOP workspace */
  {
    MetaWorkspace *space;
    
    space = meta_screen_get_workspace_by_index (screen,
                                                current_workspace);
    
    if (space != NULL)
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      meta_workspace_activate (space, timestamp);
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  }
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  meta_verbose ("Added screen %d ('%s') root 0x%lx\n",
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                screen->number, screen->screen_name, screen->xroot);
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  return screen;
}

void
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meta_screen_free (MetaScreen *screen,
                  guint32     timestamp)
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{
  MetaDisplay *display;
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  XGCValues gc_values = { 0 };
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  display = screen->display;
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  screen->closing += 1;
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  meta_display_grab (display);

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  if (screen->display->compositor)
    {
      meta_compositor_unmanage_screen (screen->display->compositor,
				       screen);
    }
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  meta_display_unmanage_windows_for_screen (display, screen, timestamp);
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  meta_prefs_remove_listener (prefs_changed_callback, screen);
  
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  meta_screen_ungrab_keys (screen);
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#ifdef HAVE_STARTUP_NOTIFICATION
  g_slist_foreach (screen->startup_sequences,
                   (GFunc) sn_startup_sequence_unref, NULL);
  g_slist_free (screen->startup_sequences);
  screen->startup_sequences = NULL;

  if (screen->startup_sequence_timeout != 0)
    {
      g_source_remove (screen->startup_sequence_timeout);
      screen->startup_sequence_timeout = 0;
    }
  if (screen->sn_context)
    {
      sn_monitor_context_unref (screen->sn_context);
      screen->sn_context = NULL;
    }
#endif
  
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  meta_ui_free (screen->ui);
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  meta_stack_free (screen->stack);
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  meta_error_trap_push_with_return (screen->display);
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  XSelectInput (screen->display->xdisplay, screen->xroot, 0);
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  if (meta_error_trap_pop_with_return (screen->display, FALSE) != Success)
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    meta_warning (_("Could not release screen %d on display \"%s\"\n"),
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                  screen->number, screen->display->name);
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  XDestroyWindow (screen->display->xdisplay,
                  screen->wm_sn_selection_window);
  
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  if (screen->work_area_idle != 0)
    g_source_remove (screen->work_area_idle);
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  if (XGetGCValues (screen->display->xdisplay,
                    screen->root_xor_gc,
                    GCFont,
                    &gc_values))
    {
      XUnloadFont (screen->display->xdisplay,
                   gc_values.font);
    }

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  XFreeGC (screen->display->xdisplay,
           screen->root_xor_gc);
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  if (screen->xinerama_infos)
    g_free (screen->xinerama_infos);
  
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  g_free (screen->screen_name);
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  g_free (screen);
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  XFlush (display->xdisplay);
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  meta_display_ungrab (display);
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}

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typedef struct
{
  Window		xwindow;
  XWindowAttributes	attrs;
} WindowInfo;

static GList *
list_windows (MetaScreen *screen)
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{
  Window ignored1, ignored2;
  Window *children;
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  guint n_children, i;
  GList *result;
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  XQueryTree (screen->display->xdisplay,
              screen->xroot,
              &ignored1, &ignored2, &children, &n_children);
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  result = NULL;
  for (i = 0; i < n_children; ++i)
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    {
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      WindowInfo *info = g_new0 (WindowInfo, 1);
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      meta_error_trap_push_with_return (screen->display);
      
      XGetWindowAttributes (screen->display->xdisplay,
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                            children[i], &info->attrs);

      if (meta_error_trap_pop_with_return (screen->display, TRUE))
	{
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          meta_verbose ("Failed to get attributes for window 0x%lx\n",
                        children[i]);
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	  g_free (info);
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        }
      else
        {
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	  info->xwindow = children[i];
	}
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      result = g_list_prepend (result, info);
    }
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  if (children)
    XFree (children);

  return g_list_reverse (result);
}

void
meta_screen_manage_all_windows (MetaScreen *screen)
{
  GList *windows;
  GList *list;

  meta_display_grab (screen->display);
  
  windows = list_windows (screen);

  meta_stack_freeze (screen->stack);
  for (list = windows; list != NULL; list = list->next)
    {
      WindowInfo *info = list->data;

      meta_window_new_with_attrs (screen->display, info->xwindow, TRUE,
				  &info->attrs);
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    }
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  meta_stack_thaw (screen->stack);
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  g_list_foreach (windows, (GFunc)g_free, NULL);
  g_list_free (windows);

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  meta_display_ungrab (screen->display);
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}

void
meta_screen_composite_all_windows (MetaScreen *screen)
{
  GList *windows, *list;

  if (!screen->display->compositor)
    return;
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  windows = list_windows (screen);

  meta_stack_freeze (screen->stack);

  for (list = windows; list != NULL; list = list->next)
    {
      WindowInfo *info = list->data;

      meta_compositor_add_window (screen->display->compositor,
				  info->xwindow, &info->attrs);
    }

  meta_stack_thaw (screen->stack);

  g_list_foreach (windows, (GFunc)g_free, NULL);
  g_list_free (windows);
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}
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MetaScreen*
meta_screen_for_x_screen (Screen *xscreen)
{
  MetaDisplay *display;
  
  display = meta_display_for_x_display (DisplayOfScreen (xscreen));

  if (display == NULL)
    return NULL;
  
  return meta_display_screen_for_x_screen (display, xscreen);
}
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static void
prefs_changed_callback (MetaPreference pref,
                        gpointer       data)
{
  MetaScreen *screen = data;
  
  if (pref == META_PREF_NUM_WORKSPACES)
    {
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      /* GConf doesn't provide timestamps, but luckily update_num_workspaces
       * often doesn't need it...
       */
      guint32 timestamp = 
        meta_display_get_current_time_roundtrip (screen->display);
      update_num_workspaces (screen, timestamp);
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    }
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  else if (pref == META_PREF_FOCUS_MODE)
    {
      update_focus_mode (screen);
    }
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  else if (pref == META_PREF_WORKSPACE_NAMES)
    {
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      set_workspace_names (screen);
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    }
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}


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static char*
get_screen_name (MetaDisplay *display,
                 int          number)
{
  char *p;
  char *dname;
  char *scr;
  
  /* DisplayString gives us a sort of canonical display,
   * vs. the user-entered name from XDisplayName()
   */
  dname = g_strdup (DisplayString (display->xdisplay));

  /* Change display name to specify this screen.
   */
  p = strrchr (dname, ':');
  if (p)
    {
      p = strchr (p, '.');
      if (p)
        *p = '\0';
    }
  
  scr = g_strdup_printf ("%s.%d", dname, number);

  g_free (dname);

  return scr;
}
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static gint
ptrcmp (gconstpointer a, gconstpointer b)
{
  if (a < b)
    return -1;
  else if (a > b)
    return 1;
  else
    return 0;
}

static void
listify_func (gpointer key, gpointer value, gpointer data)
{
  GSList **listp;
  
  listp = data;

  *listp = g_slist_prepend (*listp, value);
}

void
meta_screen_foreach_window (MetaScreen *screen,
                            MetaScreenWindowFunc func,
                            gpointer data)
{
  GSList *winlist;
  GSList *tmp;

  /* If we end up doing this often, just keeping a list
   * of windows might be sensible.
   */
  
  winlist = NULL;
  g_hash_table_foreach (screen->display->window_ids,
                        listify_func,
                        &winlist);
  
  winlist = g_slist_sort (winlist, ptrcmp);
  
  tmp = winlist;
  while (tmp != NULL)
    {
      /* If the next node doesn't contain this window
       * a second time, delete the window.
       */
      if (tmp->next == NULL ||
          (tmp->next && tmp->next->data != tmp->data))
        {
          MetaWindow *window = tmp->data;

          if (window->screen == screen)
            (* func) (screen, window, data);
        }
      
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      tmp = tmp->next;
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    }
  g_slist_free (winlist);
}

static void
queue_draw (MetaScreen *screen, MetaWindow *window, gpointer data)
{
  if (window->frame)
    meta_frame_queue_draw (window->frame);
}

void
meta_screen_queue_frame_redraws (MetaScreen *screen)
{
  meta_screen_foreach_window (screen, queue_draw, NULL);
}
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static void
queue_resize (MetaScreen *screen, MetaWindow *window, gpointer data)
{
  meta_window_queue_move_resize (window);
}

void
meta_screen_queue_window_resizes (MetaScreen *screen)
{
  meta_screen_foreach_window (screen, queue_resize, NULL);
}
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int
meta_screen_get_n_workspaces (MetaScreen *screen)
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{
  return g_list_length (screen->workspaces);
}

MetaWorkspace*
meta_screen_get_workspace_by_index (MetaScreen  *screen,
                                    int          idx)
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{
  GList *tmp;
  int i;

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  /* should be robust, idx is maybe from an app */
  if (idx < 0)
    return NULL;
  
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  i = 0;
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  tmp = screen->workspaces;
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  while (tmp != NULL)
    {
      MetaWorkspace *w = tmp->data;

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      if (i == idx)
        return w;

      ++i;
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      tmp = tmp->next;
    }

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  return NULL;
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}
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static void
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set_number_of_spaces_hint (MetaScreen *screen,
			   int         n_spaces)
{
  unsigned long data[1];

  if (screen->closing > 0)
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    return;
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  data[0] = n_spaces;

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  meta_verbose ("Setting _NET_NUMBER_OF_DESKTOPS to %lu\n", data[0]);
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  meta_error_trap_push (screen->display);
  XChangeProperty (screen->display->xdisplay, screen->xroot,
                   screen->display->atom_net_number_of_desktops,
                   XA_CARDINAL,
                   32, PropModeReplace, (guchar*) data, 1);
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  meta_error_trap_pop (screen->display, FALSE);
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}

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static void
set_desktop_geometry_hint (MetaScreen *screen)
{
  unsigned long data[2];

  if (screen->closing > 0)
    return;

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  data[0] = screen->rect.width;
  data[1] = screen->rect.height;
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  meta_verbose ("Setting _NET_DESKTOP_GEOMETRY to %lu, %lu\n", data[0], data[1]);
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  meta_error_trap_push (screen->display);
  XChangeProperty (screen->display->xdisplay, screen->xroot,
                   screen->display->atom_net_desktop_geometry,
                   XA_CARDINAL,
                   32, PropModeReplace, (guchar*) data, 2);
  meta_error_trap_pop (screen->display, FALSE);
}

static void
set_desktop_viewport_hint (MetaScreen *screen)
{
  unsigned long data[2];

  if (screen->closing > 0)
    return;

  /*
   * Metacity does not implement viewports, so this is a fixed 0,0
   */
  data[0] = 0;
  data[1] = 0;

  meta_verbose ("Setting _NET_DESKTOP_VIEWPORT to 0, 0\n");

  meta_error_trap_push (screen->display);
  XChangeProperty (screen->display->xdisplay, screen->xroot,
                   screen->display->atom_net_desktop_viewport,
                   XA_CARDINAL,
                   32, PropModeReplace, (guchar*) data, 2);
  meta_error_trap_pop (screen->display, FALSE);
}

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static void
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update_num_workspaces (MetaScreen *screen,
                       guint32     timestamp)
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{
  int new_num;
  GList *tmp;
  int i;
  GList *extras;
  MetaWorkspace *last_remaining;
  gboolean need_change_space;
  
  new_num = meta_prefs_get_num_workspaces ();

  g_assert (new_num > 0);

  last_remaining = NULL;
  extras = NULL;
  i = 0;
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  tmp = screen->workspaces;
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  while (tmp != NULL)
    {
      MetaWorkspace *w = tmp->data;

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      if (i >= new_num)
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        extras = g_list_prepend (extras, w);
      else
        last_remaining = w;
          
      ++i;
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      tmp = tmp->next;
    }

  g_assert (last_remaining);
  
  /* Get rid of the extra workspaces by moving all their windows
   * to last_remaining, then activating last_remaining if
   * one of the removed workspaces was active. This will be a bit
   * wacky if the config tool for changing number of workspaces
   * is on a removed workspace ;-)
   */
  need_change_space = FALSE;
  tmp = extras;
  while (tmp != NULL)
    {
      MetaWorkspace *w = tmp->data;

      meta_workspace_relocate_windows (w, last_remaining);      

      if (w == screen->active_workspace)
        need_change_space = TRUE;
      
      tmp = tmp->next;
    }

  if (need_change_space)
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    meta_workspace_activate (last_remaining, timestamp);
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  /* Should now be safe to free the workspaces */
  tmp = extras;
  while (tmp != NULL)
    {
      MetaWorkspace *w = tmp->data;

      g_assert (w->windows == NULL);
      meta_workspace_free (w);
      
      tmp = tmp->next;
    }
  
  g_list_free (extras);
  
  while (i < new_num)
    {
      meta_workspace_new (screen);
      ++i;
    }
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  set_number_of_spaces_hint (screen, new_num);

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  meta_screen_queue_workarea_recalc (screen);
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}
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static void
update_focus_mode (MetaScreen *screen)
{