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ewmh.c

/* 
 *  Matchbox Window Manager - A lightweight window manager not for the
 *                            desktop.
 *
 *  Authored By Matthew Allum <mallum@o-hand.com>
 *
 *  Copyright (c) 2002, 2004 OpenedHand Ltd - http://o-hand.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, 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.
 *
 */

#include "ewmh.h"

static void set_supported(Wm *w);
static void set_compliant(Wm *w);

void
ewmh_init(Wm *w)
{
  /*  
      The list below *MUST* be kept in the same order as the corresponding
      emun in structs.h or *everything* will break.
      Doing it like this avoids a mass of round trips on startup.
  */

  char *atom_names[] = {
    "WM_STATE",
    "WM_CHANGE_STATE",
    "WM_PROTOCOLS",
    "WM_DELETE_WINDOW",
    "WM_COLORMAP_WINDOWS",
    "_MB_THEME",
    "_MB_THEME_NAME",

    "_NET_WM_WINDOW_TYPE_TOOLBAR",
    "_NET_WM_WINDOW_TYPE_DOCK",
    "_NET_WM_WINDOW_TYPE_DIALOG",
    "_NET_WM_WINDOW_TYPE_SPLASH",
    "_NET_WM_WINDOW_TYPE_DESKTOP",
    "_NET_WM_WINDOW_TYPE_NORMAL",
    "_MB_COMMAND",

    "_MB_CLIENT_EXEC_MAP",
    "_MB_CLIENT_STARTUP_LIST",
  
    "_NET_WM_STATE",
    "_NET_WM_STATE_FULLSCREEN",
    "_NET_WM_STATE_MODAL",
  
    "_NET_SUPPORTED",
    "_NET_CLIENT_LIST",
    "_NET_NUMBER_OF_DESKTOPS",
    "_NET_ACTIVE_WINDOW",
    "_NET_SUPPORTING_WM_CHECK",
  
    "_NET_CLOSE_WINDOW",
  
    "_NET_WM_NAME",
    "UTF8_STRING",
    "_NET_CLIENT_LIST_STACKING",
    "_NET_CURRENT_DESKTOP",
    "_NET_WM_DESKTOP",
    "_NET_WM_ICON",
    "_NET_DESKTOP_GEOMETRY",
    "_NET_WORKAREA",
  
    "_NET_SHOWING_DESKTOP",
  
    "_MOTIF_WM_HINTS",

    "_NET_WM_CONTEXT_HELP",
    "_NET_WM_CONTEXT_ACCEPT",

    "_NET_WM_ALLOWED_ACTIONS",
    "_NET_WM_ACTION_MOVE",
    "_NET_WM_ACTION_RESIZE",
    "_NET_WM_ACTION_MINIMIZE",
    "_NET_WM_ACTION_SHADE",
    "_NET_WM_ACTION_STICK",
    "_NET_WM_ACTION_MAXIMIZE_HORZ",
    "_NET_WM_ACTION_MAXIMIZE_VERT",
    "_NET_WM_ACTION_FULLSCREEN",
    "_NET_WM_ACTION_CHANGE_DESKTOP",
    "_NET_WM_ACTION_CLOSE",
    
    "_NET_STARTUP_ID",

    "_WIN_SUPPORTING_WM_CHECK",

    "_MB_WM_WINDOW_TYPE_MESSAGE",

    "_NET_WM_WINDOW_TYPE",

    "_NET_WM_PING",
    "_NET_WM_PID",
    "WM_CLIENT_MACHINE",
    "_MB_WM_STATE_DOCK_TITLEBAR",
    "_NET_WM_CONTEXT_CUSTOM",
    "_NET_WM_WINDOW_TYPE_MENU",
    "CM_TRANSLUCENCY",
    "_MB_DOCK_TITLEBAR_SHOW_ON_DESKTOP",
    "_MB_GRAB_TRANSFER",
    "_NET_WM_WINDOW_TYPE_INPUT",
    "_NET_WM_STATE_ABOVE",
    "WM_TRANSIENT_FOR",
    "_NET_WM_SYNC_REQUEST_COUNTER",
    "_NET_WM_SYNC_REQUEST",
    "_MB_CURRENT_APP_WINDOW",
    "_MB_APP_WINDOW_LIST_STACKING",
    "_NET_WM_USER_TIME"

  };

  XInternAtoms (w->dpy, atom_names, ATOM_COUNT,
                False, w->atoms);

#ifdef USE_XSYNC
  ewmh_sync_init(w);
#endif
}

void
ewmh_init_props(Wm *w)
{
  int num_desktops = 1;
  
  set_compliant(w);
  set_supported(w);
  
  XChangeProperty(w->dpy, w->root, w->atoms[_NET_NUMBER_OF_DESKTOPS],
              XA_CARDINAL, 32, PropModeReplace,
              (unsigned char *)&num_desktops, 1);
  
  XChangeProperty(w->dpy, w->root, w->atoms[_NET_CURRENT_DESKTOP],
              XA_CARDINAL, 32, PropModeReplace,
              (unsigned char *)&num_desktops, 1);
}

int
ewmh_handle_root_message(Wm *w, XClientMessageEvent *e)
{
  /* Handle client messages _sent_ to root window */

   Client *c = NULL;

   dbg("%s() called\n", __func__);

   if (e->message_type == w->atoms[_NET_ACTIVE_WINDOW])
     {
       dbg("%s() got active window message for win %li", __func__, e->window);
       if ((c = wm_find_client(w, e->window, WINDOW)) != NULL)
       {
         if (c->type == MBCLIENT_TYPE_DIALOG
             && c->trans != NULL)
           {
             /* 
                * If an attempt has been made to activate a hidden
                * dialog, activate its parent app first.
                *
                * Note this is mainly to work with some task selectors
                * ( eg the gnome one, which activates top dialog ).
                *
                * XXX wm_activate_client() should probably do this.
             */

             Client *parent = c->trans;

             while (parent->trans != NULL)
             parent = parent->trans;

             if (parent != wm_get_visible_main_client(w))
             wm_activate_client(parent);
           }
         /* Likely activated by a TN so start pinging if aggresive setup */
         if (w->config->ping_aggressive 
             && c->type == MBCLIENT_TYPE_APP
             && c != wm_get_visible_main_client(w))
           ewmh_ping_client_start (c);
         wm_activate_client(c);
       }
       return 1;
     } 
   else if (e->message_type == w->atoms[_NET_CLOSE_WINDOW]) 
     {
       if ((c = wm_find_client(w, e->window, WINDOW)) != NULL)
       client_deliver_delete(c);
       return 1;
     } 
   else if (e->message_type == w->atoms[WM_PROTOCOLS]
          && e->data.l[0] == w->atoms[_NET_WM_PING]) 
     {
       if ((c = wm_find_client(w, e->data.l[1], WINDOW)) != NULL)
       {
         dbg("%s() pong from %s\n", __func__, c->name);

         /* We got a response to a ping. stop pinging it now
          * until close button is pressed again. 
         */
         if (c->ping_handler_called)
           {
             int len;
             char *buf;
             /* aha! this was thought be be dead but has come
            * alive again..
             */
             len = strlen(w->config->ping_handler) + 32;
             buf = malloc(len);

             if (buf)
             {
               snprintf(buf, len-1, "%s %i %li 1",
                      w->config->ping_handler,
                      c->pid,
                      c->window);
               
               fork_exec(buf);
               
               free(buf);
             }
           }

         if (w->config->ping_aggressive)
           {
             if (c->pings_pending >= 0)
             c->pings_pending--;
           }
         else
           {
             /* Regular pinging, assume 1 reply and the  
            * app is alive. 
             */
             if (c->pings_pending > 0) 
             {
               ewmh_ping_client_stop(c);
             }
           }
       }
     } 
   else if (e->message_type == w->atoms[WINDOW_STATE]) 
     {
       if (e->data.l[1] == w->atoms[WINDOW_STATE_FULLSCREEN]
         && ((c = wm_find_client(w, e->window, WINDOW)) != NULL)
         && c->type == MBCLIENT_TYPE_APP)
       {
         dbg("got EWMH fullscreen state change\n");
         switch (e->data.l[0])
           {
           case _NET_WM_STATE_REMOVE:
             if (c->flags & CLIENT_FULLSCREEN_FLAG)
             main_client_toggle_fullscreen(c);
             break;
           case _NET_WM_STATE_ADD:
             if (!(c->flags & CLIENT_FULLSCREEN_FLAG))
             main_client_toggle_fullscreen(c);
             break;
           case _NET_WM_STATE_TOGGLE:
             main_client_toggle_fullscreen(c);
             break;
           }
       }
       else if (e->data.l[1] == w->atoms[WINDOW_STATE_ABOVE]
            && ((c = wm_find_client(w, e->window, WINDOW)) != NULL)
            && c->type == MBCLIENT_TYPE_DIALOG)
       {
         dbg("got EWMH above state change\n");
         switch (e->data.l[0])
           {
           case _NET_WM_STATE_REMOVE:
             c->flags &= ~CLIENT_HAS_ABOVE_STATE;
             break;
           case _NET_WM_STATE_ADD:
             c->flags |= CLIENT_HAS_ABOVE_STATE;
             break;
           case _NET_WM_STATE_TOGGLE:
             c->flags ^= CLIENT_HAS_ABOVE_STATE;
             break;
           }
         wm_activate_client(c);
       }
       return 1;
     } 
   else if (e->message_type == w->atoms[_NET_SHOW_DESKTOP]
          && wm_get_desktop(w) ) 
     {
       dbg("%s() got desktop message\n", __func__);
       if (e->data.l[0] == 1)
       {                /* Show the desktop, if not shown */
         if (!(w->flags & DESKTOP_RAISED_FLAG))
           wm_toggle_desktop(w);
       } else {                 /* Hide the desktop, if shown */
         if (w->flags & DESKTOP_RAISED_FLAG)
           wm_toggle_desktop(w);
       }
     }
   
   return 0;
}

void
ewmh_update_lists(Wm *w)
{
   Client        *c = NULL;
   Window        *wins = NULL;
   int            cnt = 0;
   
   dbg("%s(): called %i\n", __func__, n_stack_items(w)); 

#ifdef USE_LIBSN
   unsigned char *bin_map_str = NULL; 
   int  bin_map_cnt = 0;
   SnCycle *current_cycle = w->sn_cycles;

   dbg("%s() called\n", __func__);

   while(current_cycle != NULL)
     {
       dbg("%s() checking cycle %s\n", __func__, current_cycle->bin_name);
       if (current_cycle->xid != None)
      {
        dbg("%s() has xid %li\n", __func__, current_cycle->xid);
        bin_map_cnt += (strlen(current_cycle->bin_name) + 32);
        dbg("%s(): bin_map_cnt : %i, name: %s\n", __func__, 
            bin_map_cnt, current_cycle->bin_name) ;
      }
       current_cycle = current_cycle->next;
     }
   
  if (bin_map_cnt)
    {
      bin_map_str = malloc(sizeof(unsigned char)*bin_map_cnt);
      memset( bin_map_str, 0, bin_map_cnt);
      
      current_cycle = w->sn_cycles;
      
      while(current_cycle != NULL)
      {
        if (current_cycle->xid != None)
          {
            char str_tmp[256] = "";
            snprintf(str_tmp, 256, "%s=%li|", 
                   current_cycle->bin_name, 
                   current_cycle->xid);
            
            strcat(bin_map_str, str_tmp);
            
            dbg("%s(): bin_map_str : %s , str_tmp: %s \n", 
              __func__, bin_map_str, str_tmp) ;
          }
        current_cycle = current_cycle->next;
      }
      
      if (bin_map_str) 
      {
        XChangeProperty(w->dpy, w->root, w->atoms[MB_CLIENT_EXEC_MAP] ,
                    XA_STRING, 8, PropModeReplace,
                    (unsigned char *)bin_map_str, strlen(bin_map_str)
                    );
        free(bin_map_str);
      } else {
        dbg("%s() deleting MB_CLIENT_EXEC_MAP\n", __func__);
        XDeleteProperty(w->dpy, w->root, w->atoms[MB_CLIENT_EXEC_MAP]);
      }
      XFlush(w->dpy);
    }
  else
    {
      dbg("%s() deleting MB_CLIENT_EXEC_MAP\n", __func__);
      XDeleteProperty(w->dpy, w->root, w->atoms[MB_CLIENT_EXEC_MAP]);
    }

#endif

  /* Root window client win lists */

   if (!stack_empty(w))
   {
     MBList *item = NULL;
     Window *app_wins = NULL;
     int     app_win_cnt = 0;

     dbg("%s(): updating ewmh list props %i items\n", 
       __func__, n_stack_items(w) ) ;   

     wins     = malloc(sizeof(Window)*n_stack_items(w));
     app_wins = malloc(sizeof(Window)*n_stack_items(w));

     stack_enumerate(w,c)
       {
       wins[cnt++] = c->window;
       if (c->type == MBCLIENT_TYPE_APP)
         app_wins[app_win_cnt++] = c->window;
       }
  
     XChangeProperty(w->dpy, w->root, w->atoms[_NET_CLIENT_LIST_STACKING] ,
                 XA_WINDOW, 32, PropModeReplace,
                 (unsigned char *)wins, n_stack_items(w));

     XChangeProperty(w->dpy, w->root, w->atoms[_MB_APP_WINDOW_LIST_STACKING],
                 XA_WINDOW, 32, PropModeReplace,
                 (unsigned char *)app_wins, app_win_cnt);

     free(app_wins);

     /* Update _NET_CLIENT_LIST but with 'age' order rathe rthan stacking */

     cnt = 0;

     list_enumerate(w->client_age_list, item)
       {
       c = (Client*)item->data;
       wins[cnt++] = c->window;
       dbg("%s() adding %s\n", __func__, c->name);
       }

     XChangeProperty(w->dpy, w->root, w->atoms[_NET_CLIENT_LIST] ,
                 XA_WINDOW, 32, PropModeReplace,
                 (unsigned char *)wins, n_stack_items(w));
   }

  if (wins)
    free(wins);
}

void
ewmh_update_desktop_hint(Wm *w)
{
   /* Desktop showing hint */

   int val = (w->flags & DESKTOP_RAISED_FLAG) ? 1 : 0;

   XChangeProperty(w->dpy, w->root, w->atoms[_NET_SHOW_DESKTOP],
               XA_CARDINAL, 32, PropModeReplace, 
               (unsigned char *)&val, 1);
}

void
ewmh_update_rects(Wm *w)
{
  CARD32 val[4];

  val[0] = wm_get_offsets_size(w, WEST, NULL, True);
  val[1] = wm_get_offsets_size(w, NORTH, NULL, True);
  val[2] = w->dpy_width - wm_get_offsets_size(w, WEST, NULL, True)
    - wm_get_offsets_size(w, EAST, NULL, True);
  val[3] = w->dpy_height - wm_get_offsets_size(w, NORTH, NULL, True)
    - wm_get_offsets_size(w, SOUTH, NULL, True);

  if (w->flags & DESKTOP_DECOR_FLAG)
    {
      /* Desktop is decorated, needs to know frame border sizes  */

      val[0] += theme_frame_defined_width_get(w->mbtheme, 
                                       FRAME_MAIN_WEST );
      val[2] -= theme_frame_defined_width_get(w->mbtheme, 
                                       FRAME_MAIN_EAST );
      val[3] -= theme_frame_defined_height_get(w->mbtheme, FRAME_MAIN); 
    }

  dbg("%s(): vals now is %li, %li, %li, %li ( root: %li )\n", 
      __func__, val[0], val[1], val[2], val[3], w->root );

  XChangeProperty(w->dpy, w->root, w->atoms[_NET_WORKAREA],
              XA_CARDINAL, 32, PropModeReplace, (unsigned char *)val, 4);
  
  XChangeProperty(w->dpy, w->root, w->atoms[_NET_DESKTOP_GEOMETRY],
              XA_CARDINAL, 32, PropModeReplace, (unsigned char *)val, 4);

}

void 
ewmh_state_set(Client *c)
{
  Wm   *w = c->wm;

  Atom atom_states[2];
  int  n_atom_states = 0;

  /* We need to set ewmh state as some apps need to know when they 
   * return from fullscreen
   */
  if (c->flags & CLIENT_FULLSCREEN_FLAG)
    atom_states[n_atom_states++] = w->atoms[WINDOW_STATE_FULLSCREEN];

  if  (c->flags & CLIENT_IS_MODAL_FLAG)
    atom_states[n_atom_states++] = w->atoms[WINDOW_STATE_MODAL];

  /* XXX Should avoid trashing states here we dont handle. 
   *     Otherwise things like skip taskbar state get trashed. 
  */
  if (n_atom_states)
    XChangeProperty(w->dpy, c->window, w->atoms[WINDOW_STATE],
                XA_ATOM, 32, PropModeReplace, 
                (unsigned char *)atom_states, n_atom_states);
  else
    XChangeProperty(w->dpy, c->window, w->atoms[WINDOW_STATE],
                XA_ATOM, 32, PropModeReplace, 
                (unsigned char *)NULL, 0);

}

Bool 
ewmh_state_check(Client *c, Atom atom_state_wanted)
{
  Wm   *w = c->wm;

  unsigned long n;
  unsigned long extra;
  int           format, status, i;
  Atom          realType, *value = NULL;

  status = XGetWindowProperty(w->dpy, c->window,
                        w->atoms[WINDOW_STATE],
                        0L, 1000000L,
                        0, XA_ATOM, &realType, &format,
                        &n, &extra, (unsigned char **) &value);
  if (status == Success)
    {
      if (realType == XA_ATOM && format == 32 && n > 0)
      {
        for(i=0; i < n; i++)
          if (value[i] && value[i] == atom_state_wanted)
            {
            if (value) XFree(value);
            return True;
            }
      }
    }
  
  if (value) 
    XFree(value);

   return False;
}

void 
ewmh_set_allowed_actions(Wm *w, Client *c)
{
  int num_actions = 1;

  Atom actions[] = {
    w->atoms[_NET_WM_ACTION_CLOSE],
    0, 0
  }; 

  if (c->type == MBCLIENT_TYPE_APP)
    actions[num_actions++] = w->atoms[_NET_WM_ACTION_FULLSCREEN];

  if (c->type == MBCLIENT_TYPE_PANEL || c->type == MBCLIENT_TYPE_DIALOG)
    actions[num_actions++] = w->atoms[_NET_WM_ACTION_MOVE];

  XChangeProperty(w->dpy, c->window, w->atoms[_NET_WM_ALLOWED_ACTIONS],
              XA_ATOM, 32, PropModeReplace, (unsigned char *)actions,
              num_actions);
}

void 
ewmh_set_active(Wm *w)
{

  static unsigned long last_active; 
  unsigned long        val[1] = { 0 };

  if (w->focused_client != NULL)
    val[0] = w->focused_client->window;

  if (last_active == val[0])  /* avoid the roundtrip if pos */
    return;

  last_active = val[0]; 

  dbg("%s() setting %li as active\n", __func__, val[0] );

  XChangeProperty(w->dpy, w->root, w->atoms[_NET_ACTIVE_WINDOW] ,
              XA_WINDOW, 32, PropModeReplace,
              (unsigned char *)val, 1);
}

int
ewmh_get_user_time (Client *c)
{
  Wm *w = c->wm;

  Atom          real_type; 
  int           real_format;
  unsigned long items_read, items_left;
  int          *data = NULL, result = -1;

  if (XGetWindowProperty(w->dpy, c->window,
                   w->atoms[_NET_WM_USER_TIME], 
                   0L, 2L, False,
                   XA_CARDINAL, 
                   &real_type, 
                   &real_format,
                   &items_read, 
                   &items_left,
                   (unsigned char **) &data) == Success
      && items_read)
    result = *data;

  if (data)
    XFree(data);

  return result;
}

void 
ewmh_set_current_app_window(Wm *w)
{
  Client              *c;
  static unsigned long last_active; 
  unsigned long        val[1] = { 0 };

  if ((c = wm_get_visible_main_client(w)) != NULL)
    val[0] = c->window;

  if (last_active == val[0])  /* avoid the roundtrip if pos */
    return;

  last_active = val[0]; 

  XChangeProperty(w->dpy, w->root, w->atoms[_MB_CURRENT_APP_WINDOW] ,
              XA_WINDOW, 32, PropModeReplace,
              (unsigned char *)val, 1);
}


void
ewmh_ping_client_start (Client *c)
{
#ifndef NO_PING
  if (c->has_ping_protocol && c->pings_pending == -1) 
    {
      c->pings_pending       = 0;
      c->pings_sent          = 0;
      c->ping_handler_called = False;
      c->wm->n_active_ping_clients++;

      dbg("starting pinging '%s' , active: %i\n", 
        c->name, c->wm->n_active_ping_clients);
    }
#endif
}

void
ewmh_ping_client_stop (Client *c)
{
#ifndef NO_PING
  if (c->has_ping_protocol && c->pings_pending != -1) 
    {
      dbg("stopping pinging '%s' , pending: %i\n", 
        c->name, c->pings_pending);

      c->pings_pending = -1;
      c->wm->n_active_ping_clients--;

      dbg("stopping pinging '%s' , active: %i\n", 
        c->name, c->wm->n_active_ping_clients);
    }
#endif
}

void
ewmh_hung_app_check(Wm *w)
{
#ifndef NO_PING

  Client *c = NULL;

  if (stack_empty(w)) 
    return;

  dbg("%s() called\n", __func__ );

  stack_enumerate(w, c)
    {
      if (c->has_ping_protocol && c->pings_pending != -1)
      {
        XEvent e;
        
        c->pings_pending++;

        dbg("%s() pinging %s\n", __func__, c->name);

        e.type = ClientMessage;
        e.xclient.window = c->window;
        e.xclient.message_type = w->atoms[WM_PROTOCOLS];
        e.xclient.format = 32;
        e.xclient.data.l[0] = w->atoms[_NET_WM_PING];

        /* To save a load of code bloat, we just set the timestamp
         * to the client window ID. This could be slightly evil but
         * makes things much more compact. 
        */
        e.xclient.data.l[1] = c->window;
        XSendEvent(w->dpy, c->window, False, 0, &e);
        XSync(w->dpy, False);

        c->pings_sent++;

        if (c->pings_pending > PING_PENDING_MAX)
          {
            if (w->config->ping_handler && c->pid)
            {
              /* fire off external binary to handle hung app 
                   * if env var is set. 
              */
              int   len;
              char *buf = NULL;

              if (!c->ping_handler_called)
                {
                  len = strlen(w->config->ping_handler) + 32;
                  buf = malloc(len);

                  if (buf)
                  {
                    snprintf(buf, len-1, "%s %i %li",
                           w->config->ping_handler,
                           c->pid,
                           c->window);
                    
                    fork_exec(buf);
                    
                    free(buf);
                    c->ping_handler_called = True;
                  }
                }

              /* dont ping any more */
               if ( !w->config->ping_aggressive )
                {
                  ewmh_ping_client_stop (c);
                }
            }
            else
            client_obliterate(c);
          }

        if (w->config->ping_aggressive 
            && c->pings_sent >= PING_CHECK_DURATION)
          ewmh_ping_client_stop (c);
      }
    }

#endif
}

static void set_supported(Wm *w) /*  */
{
  int num_supported = 0;

  Atom supported[] = {
    w->atoms[WINDOW_TYPE_TOOLBAR],
    w->atoms[WINDOW_TYPE_DOCK],
    w->atoms[WINDOW_TYPE_DIALOG],
    w->atoms[WINDOW_TYPE_DESKTOP],
    w->atoms[WINDOW_TYPE_SPLASH],
    w->atoms[WINDOW_TYPE_MENU],
    w->atoms[WINDOW_STATE],
    w->atoms[WINDOW_STATE_FULLSCREEN],
    w->atoms[WINDOW_STATE_MODAL],
    w->atoms[_NET_SUPPORTED],
    w->atoms[_NET_CLIENT_LIST],
    w->atoms[_NET_NUMBER_OF_DESKTOPS],
    w->atoms[_NET_ACTIVE_WINDOW],
    w->atoms[_NET_SUPPORTING_WM_CHECK],
    w->atoms[_NET_CLOSE_WINDOW],
    w->atoms[_NET_CURRENT_DESKTOP],
    w->atoms[_NET_CLIENT_LIST_STACKING],
    w->atoms[_NET_CURRENT_DESKTOP],
    w->atoms[_NET_SHOW_DESKTOP],
    w->atoms[_NET_WM_NAME],
    w->atoms[_NET_WM_ICON],
    w->atoms[_NET_WM_ALLOWED_ACTIONS],
    w->atoms[_NET_WM_ACTION_MOVE],
    w->atoms[_NET_WM_ACTION_FULLSCREEN],
    w->atoms[_NET_WM_ACTION_CLOSE],
    w->atoms[_NET_STARTUP_ID],
    w->atoms[_NET_WM_PING],
    w->atoms[_NET_WORKAREA],
    w->atoms[_NET_DESKTOP_GEOMETRY],
    w->atoms[_NET_WM_PING],
    w->atoms[_NET_WM_PID],
    w->atoms[CM_TRANSLUCENCY],
    0, 0
   };

  num_supported = sizeof(supported)/sizeof(Atom) - 2;

  /* Check to see if the theme supports help / accept buttons */
  if (( theme_frame_supports_button_type(w->mbtheme, FRAME_MAIN, 
                               BUTTON_ACTION_ACCEPT)
      || w->config->use_title == False )
      && theme_frame_supports_button_type(w->mbtheme, FRAME_DIALOG, 
                                BUTTON_ACTION_ACCEPT))
    supported[num_supported++] = w->atoms[_NET_WM_CONTEXT_ACCEPT];

  if (( theme_frame_supports_button_type(w->mbtheme, FRAME_MAIN, 
                               BUTTON_ACTION_HELP)
      || w->config->use_title == False )
      && theme_frame_supports_button_type(w->mbtheme, FRAME_DIALOG, 
                                BUTTON_ACTION_HELP))
    supported[num_supported++] = w->atoms[_NET_WM_CONTEXT_HELP];

  XChangeProperty(w->dpy, w->root, w->atoms[_NET_SUPPORTED],
              XA_ATOM, 32, PropModeReplace, (unsigned char *)supported,
              num_supported);
}

unsigned char *
ewmh_get_utf8_prop(Wm *w, Window win, Atom req_atom)
{
  Atom           type;
  int            format, result;
  unsigned long  bytes_after, n_items;
  unsigned char *str = NULL;

  misc_trap_xerrors();

  result =  XGetWindowProperty (w->dpy, win, req_atom,
                        0, 1024L,
                        False, w->atoms[UTF8_STRING],
                        &type, &format, &n_items,
                        &bytes_after, (unsigned char **)&str);



  if (misc_untrap_xerrors() || result != Success || str == NULL)
    {
      if (str) XFree (str);
      return NULL;
    }

  if (type != w->atoms[UTF8_STRING] || format != 8 || n_items == 0)
    {
      XFree (str);
      return NULL;
    }

  if (ewmh_utf8_validate(str, n_items))
    {
      dbg("%s() got %s\n", __func__, str);
      return str;
    }

  fprintf(stderr, "matchbox: UTF8 encoding bad on win %li\n", win);

  return NULL;  /* XXX check this value is correctly Xfree'd  */
}

#ifndef REDUCE_BLOAT

int*
ewmh_get_icon_prop_data(Wm *w, Window win)
{
  Atom           type;
  int            format, result;
  unsigned long  bytes_after, n_items;
  unsigned char *data = NULL;

  misc_trap_xerrors();

  result =  XGetWindowProperty (w->dpy, win, w->atoms[_NET_WM_ICON],
                        0, 100000L,
                        False, XA_CARDINAL,
                        &type, &format, &n_items,
                        &bytes_after, (unsigned char **)&data);

  if (misc_untrap_xerrors() || result != Success || data == NULL)
    {
      if (data) XFree (data);
      return NULL;
    }

  return (int *)data;
}

#endif

static void set_compliant(Wm *w) /* lets clients know were compliant (ish) */
{
   unsigned long  val[1];
   Window  win;
   XSetWindowAttributes attr;
   char *app_name = "matchbox";
   
   attr.override_redirect = True;
   win = XCreateWindow(w->dpy, w->root,
                   -200, -200, 5, 5, 0,
                   CopyFromParent,
                   CopyFromParent,
                   CopyFromParent,
                   CWOverrideRedirect, &attr );

   val[0] = win;
   
   /* Crack Needed to stop gnome session hanging ? */
   XChangeProperty(w->dpy, w->root,w->atoms[_WIN_SUPPORTING_WM_CHECK],
               XA_WINDOW, 32, PropModeReplace, (unsigned char *)val,
               1);

   XChangeProperty(w->dpy, win, w->atoms[_WIN_SUPPORTING_WM_CHECK],
               XA_WINDOW, 32, PropModeReplace,
               (unsigned char *)val, 1);

   /* Correct way of doing it */
   XChangeProperty(w->dpy, w->root, w->atoms[_NET_SUPPORTING_WM_CHECK],
               XA_WINDOW, 32, PropModeReplace, (unsigned char *)val,
               1);

   XChangeProperty(w->dpy, win, w->atoms[_NET_SUPPORTING_WM_CHECK],
               XA_WINDOW, 32, PropModeReplace,
               (unsigned char *)val, 1);


   /* set utf8 name  */
   XChangeProperty(w->dpy, win,
               w->atoms[_NET_WM_NAME],
               w->atoms[UTF8_STRING],
               8, PropModeReplace,
                   (unsigned char *)app_name, strlen(app_name)+1);

   XStoreName(w->dpy, win, app_name);   
}


/* 

_NET_WM_SYNC_REQUEST

This protocol uses the XSync extension the protocol specification and
the library documentation<) to let client and window manager
synchronize the repaint of the window manager frame and the client
window. A client indicates that it is willing to participate in the
protocol by listing _NET_WM_SYNC_REQUEST in the WM_PROTOCOLS property
of the client window and storing the XID of an XSync counter in the
property _NET_WM_SYNC_REQUEST_COUNTER. The initial value of this
counter is not defined by this specification.

A window manager uses this protocol by preceding a ConfigureNotify
event sent to a client by a client message as follows:

type = ClientMessage
window = the respective client window
message_type = WM_PROTOCOLS
format = 32
data.l[0] = _NET_WM_SYNC_REQUEST
data.l[1] = timestamp
data.l[2] = low 32 bits of the update request number
data.l[3] = high 32 bits of the update request number
other data.l[] elements = 0

After receiving one or more such message/ConfigureNotify pairs, and
having handled all repainting associated with the ConfigureNotify
events, the client MUST set the _NET_WM_SYNC_REQUEST_COUNTER to the 64
bit number indicated by the data.l[2] and data.l[3] fields of the last
client message received.

By using either the Alarm or the Await mechanisms of the XSync
extension, the window manager can know when the client has finished
handling the ConfigureNotify events. The window manager SHOULD not
resize the window faster than the client can keep up.

The update request number in the client message is determined by the
window manager subject to the restriction that it MUST NOT be 0. The
number is generally intended to be incremented by one for each message
sent. Since the initial value of the XSync counter is not defined by
this specification, the window manager MAY set the value of the XSync
counter at any time, and MUST do so when it first manages a new
window.

*/

#ifdef USE_XSYNC

static void
sync_value_increment (XSyncValue *value)
{
  XSyncValue one;
  int overflow;
  
  XSyncIntToValue (&one, 1);
  XSyncValueAdd (value, *value, one, &overflow);
}

void
ewmh_sync_init(Wm *w)
{
  if (!XSyncQueryExtension (w->dpy,
                            &w->sync_event_base,
                            &w->sync_error_base))
    {
      dbg("%s() XSyncQueryExtension FAILED.\n", __func__);
      w->have_xsync = False;
      return;
    }

  w->have_xsync = True;
}

void
ewmh_sync_handle_event(Wm *w, XSyncAlarmNotifyEvent *ev)
{
  Client *client = NULL;

  stack_enumerate(w, client)
    {
      if (client->ewmh_sync_alarm == ev->alarm)
      break;
    }

  if (client)                 /* XXX should check alarm matches */
    {
      dbg("%s() found client %s\n", __func__, client->name);
      client->move_resize(client);
    }
}

Bool
ewmh_sync_client_move_resize(Client *client)
{
  Wm *w = client->wm;
  unsigned long highval, lowval;

  if (!w->have_xsync) 
    return False;
  
  if (!client->has_ewmh_sync)
    return False;

  if (client->ewmh_sync_is_waiting)
    return False;             /* XXX WRONG XXX */

  ewmh_sync_client_init_counter(client);

  lowval  = XSyncValueLow32 (client->ewmh_sync_value);
  highval = XSyncValueHigh32 (client->ewmh_sync_value);

  sync_value_increment (&client->ewmh_sync_value);

  dbg("%s() delivering _NET_WM_SYNC_REQUEST\n", __func__);

  client_deliver_message(client, 
                   w->atoms[WM_PROTOCOLS], 
                   w->atoms[_NET_WM_SYNC_REQUEST], 
                   CurrentTime, lowval, highval,
                   0);
  
  client->ewmh_sync_is_waiting = True;
  
  return True;
}

Bool
ewmh_sync_client_init_counter(Client *client)
{
  Wm *w = client->wm;

  XSyncAlarmAttributes values;
  Atom                 type;
  int                  format, result;
  long                 bytes_after, n_items;
  XID                 *value;

  if (!w->have_xsync) 
    return False;
  
  if (!client->has_ewmh_sync)
    return False;

  result =  XGetWindowProperty (w->dpy, client->window, 
                        w->atoms[_NET_WM_SYNC_REQUEST_COUNTER],
                        0, 1024L,
                        False, XA_CARDINAL,
                        &type, &format, &n_items,
                        &bytes_after, (unsigned char **)&value);

  if (result != Success || value == NULL || format != 32)
    {
      dbg("%s() _NET_WM_SYNC_REQUEST_COUNTER failed\n", __func__);
      if (value) XFree (value);
      return False;
    }

  dbg("%s() creating alarm\n", __func__);

  client->ewmh_sync_counter = *value;

  XSyncIntsToValue (&client->ewmh_sync_value, random(), 0);
  XSyncSetCounter (w->dpy, client->ewmh_sync_counter, client->ewmh_sync_value);

  sync_value_increment (&client->ewmh_sync_value);

  values.events = True;
  values.trigger.counter    = client->ewmh_sync_counter;
  values.trigger.wait_value = client->ewmh_sync_value;
  values.trigger.value_type = XSyncAbsolute;
  values.trigger.test_type  = XSyncPositiveComparison;
  XSyncIntToValue (&values.delta, 1);
  values.events = True;

  /* Note that by default, the alarm increments the trigger value
   * when it fires until the condition (counter.value < trigger.value)
   * is FALSE again.
   */
  client->ewmh_sync_alarm = XSyncCreateAlarm (w->dpy,
                                    XSyncCACounter 
                                    | XSyncCAValue 
                                    | XSyncCAValueType 
                                    | XSyncCATestType 
                                    | XSyncCADelta 
                                    | XSyncCAEvents,
                                    &values);
  XSync (w->dpy, False);

  /* XXX untrap error here */

  return True;
}

#endif


/* UTF8 - borrowed from glib. XXX fontconfig may actually provide these calls*/

#define UTF8_COMPUTE(Char, Mask, Len)                                         \
  if (Char < 128)                                                             \
    {                                                                         \
      Len = 1;                                                                \
      Mask = 0x7f;                                                            \
    }                                                                         \
  else if ((Char & 0xe0) == 0xc0)                                             \
    {                                                                         \
      Len = 2;                                                                \
      Mask = 0x1f;                                                            \
    }                                                                         \
  else if ((Char & 0xf0) == 0xe0)                                             \
    {                                                                         \
      Len = 3;                                                                \
      Mask = 0x0f;                                                            \
    }                                                                         \
  else if ((Char & 0xf8) == 0xf0)                                             \
    {                                                                         \
      Len = 4;                                                                \
      Mask = 0x07;                                                            \
    }                                                                         \
  else if ((Char & 0xfc) == 0xf8)                                             \
    {                                                                         \
      Len = 5;                                                                \
      Mask = 0x03;                                                            \
    }                                                                         \
  else if ((Char & 0xfe) == 0xfc)                                             \
    {                                                                         \
      Len = 6;                                                                \
      Mask = 0x01;                                                            \
    }                                                                         \
  else                                                                        \
    Len = -1;

#define UTF8_LENGTH(Char)              \
  ((Char) < 0x80 ? 1 :                 \
   ((Char) < 0x800 ? 2 :               \
    ((Char) < 0x10000 ? 3 :            \
     ((Char) < 0x200000 ? 4 :          \
      ((Char) < 0x4000000 ? 5 : 6)))))

#define UTF8_GET(Result, Chars, Count, Mask, Len)                             \
  (Result) = (Chars)[0] & (Mask);                                             \
  for ((Count) = 1; (Count) < (Len); ++(Count))                               \
    {                                                                         \
      if (((Chars)[(Count)] & 0xc0) != 0x80)                                  \
        {                                                                     \
          (Result) = -1;                                                      \
          break;                                                              \
        }                                                                     \
      (Result) <<= 6;                                                         \
      (Result) |= ((Chars)[(Count)] & 0x3f);                                  \
    }

#define UNICODE_VALID(Char)                   \
    ((Char) < 0x110000 &&                     \
     ((Char) < 0xD800 || (Char) >= 0xE000) && \
     (Char) != 0xFFFE && (Char) != 0xFFFF)

int
ewmh_utf8_len(unsigned char *str) /* Only parse _validated_ utf8 */
{
  unsigned char *p = str;

  int mask, len, result = 0;
  while (*p != '\0')
    {
      UTF8_COMPUTE(*p, mask, len);
      p += len;
      result++;
    }

  return result;
}

int
ewmh_utf8_get_byte_cnt(unsigned char *str, int num_chars)
{
  unsigned char *p = str;

  int mask, len, result = 0;
  while (*p != '\0' && num_chars-- > 0)
    {
      UTF8_COMPUTE(*p, mask, len);
      p += len;
      result += len;
    }
  return result;
}


Bool 
ewmh_utf8_validate(unsigned char *str, int max_len)
{
  unsigned char *p;

  if (str == NULL) return False;

  p = str;

  while ((max_len < 0 || (p - str) < max_len) && *p)
    {
      int i, mask = 0, len;
      unsigned int result;
      unsigned char c = (unsigned char) *p;

      UTF8_COMPUTE (c, mask, len);

      if (len == -1)
        break;

      /* check that the expected number of bytes exists in str */
      if (max_len >= 0 &&
          ((max_len - (p - str)) < len))
        break;

      UTF8_GET (result, p, i, mask, len);

      if (UTF8_LENGTH (result) != len) /* Check for overlong UTF-8 */
        break;

      if (result == -1)
        break;

      if (!UNICODE_VALID (result))
        break;

      p += len;
    }

  if (max_len >= 0 &&
      p != (str + max_len))
    return False;
  else if (max_len < 0 &&
           *p != '\0')
    return False;
  else
    return True;

}



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