gdkevents-x11.c

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      XGetWindowProperty (GDK_DISPLAY_XDISPLAY (display), 
			  GDK_WINDOW_XID (window),
                          gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_DESKTOP"),
			  0, G_MAXLONG, False, XA_CARDINAL, &type, 
			  &format, &nitems,
                          &bytes_after, &data);
      gdk_error_trap_pop ();

      if (type != None)
        {
	  desktop = (gulong *)data;
          toplevel->on_all_desktops = (*desktop == 0xFFFFFFFF);
          XFree (desktop);
        }
      else
	toplevel->on_all_desktops = FALSE;
      
      do_net_wm_state_changes (window);
    }
}

static void
gdk_check_wm_state_changed (GdkWindow *window)
{
  GdkToplevelX11 *toplevel = _gdk_x11_window_get_toplevel (window);
  GdkDisplay *display = GDK_WINDOW_DISPLAY (window);
  
  Atom type;
  gint format;
  gulong nitems;
  gulong bytes_after;
  guchar *data;
  Atom *atoms = NULL;
  gulong i;

  gboolean had_sticky = toplevel->have_sticky;

  toplevel->have_sticky = FALSE;
  toplevel->have_maxvert = FALSE;
  toplevel->have_maxhorz = FALSE;
  toplevel->have_fullscreen = FALSE;

  type = None;
  gdk_error_trap_push ();
  XGetWindowProperty (GDK_DISPLAY_XDISPLAY (display), GDK_WINDOW_XID (window),
		      gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_STATE"),
		      0, G_MAXLONG, False, XA_ATOM, &type, &format, &nitems,
		      &bytes_after, &data);
  gdk_error_trap_pop ();

  if (type != None)
    {
      Atom sticky_atom = gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_STATE_STICKY");
      Atom maxvert_atom = gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_STATE_MAXIMIZED_VERT");
      Atom maxhorz_atom	= gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_STATE_MAXIMIZED_HORZ");
      Atom fullscreen_atom = gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_STATE_FULLSCREEN");

      atoms = (Atom *)data;

      i = 0;
      while (i < nitems)
        {
          if (atoms[i] == sticky_atom)
            toplevel->have_sticky = TRUE;
          else if (atoms[i] == maxvert_atom)
            toplevel->have_maxvert = TRUE;
          else if (atoms[i] == maxhorz_atom)
            toplevel->have_maxhorz = TRUE;
          else if (atoms[i] == fullscreen_atom)
            toplevel->have_fullscreen = TRUE;
          
          ++i;
        }

      XFree (atoms);
    }

  /* When have_sticky is turned on, we have to check the DESKTOP property
   * as well.
   */
  if (toplevel->have_sticky && !had_sticky)
    gdk_check_wm_desktop_changed (window);
  else
    do_net_wm_state_changes (window);
}

#define HAS_FOCUS(toplevel)                           \
  ((toplevel)->has_focus || (toplevel)->has_pointer_focus)

static void
generate_focus_event (GdkWindow *window,
		      gboolean   in)
{
  GdkEvent event;
  
  event.type = GDK_FOCUS_CHANGE;
  event.focus_change.window = window;
  event.focus_change.send_event = FALSE;
  event.focus_change.in = in;
  
  gdk_event_put (&event);
}

static void
set_screen_from_root (GdkDisplay *display,
		      GdkEvent   *event,
		      Window      xrootwin)
{
  GdkScreen *screen;

  screen = _gdk_x11_display_screen_for_xrootwin (display, xrootwin);
  g_assert (screen);

  gdk_event_set_screen (event, screen);
}

static void
translate_key_event (GdkDisplay *display,
		     GdkEvent   *event,
		     XEvent     *xevent)
{
  GdkKeymap *keymap = gdk_keymap_get_for_display (display);
  gunichar c = 0;
  guchar buf[7];

  event->key.type = xevent->xany.type == KeyPress ? GDK_KEY_PRESS : GDK_KEY_RELEASE;
  event->key.time = xevent->xkey.time;

  event->key.state = (GdkModifierType) xevent->xkey.state;
  event->key.group = _gdk_x11_get_group_for_state (display, xevent->xkey.state);
  event->key.hardware_keycode = xevent->xkey.keycode;

  event->key.keyval = GDK_VoidSymbol;

  gdk_keymap_translate_keyboard_state (keymap,
				       event->key.hardware_keycode,
				       event->key.state,
				       event->key.group,
				       &event->key.keyval,
				       NULL, NULL, NULL);

  /* Fill in event->string crudely, since various programs
   * depend on it.
   */
  event->key.string = NULL;
  
  if (event->key.keyval != GDK_VoidSymbol)
    c = gdk_keyval_to_unicode (event->key.keyval);

  if (c)
    {
      gsize bytes_written;
      gint len;

      /* Apply the control key - Taken from Xlib
       */
      if (event->key.state & GDK_CONTROL_MASK)
	{
	  if ((c >= '@' && c < '\177') || c == ' ') c &= 0x1F;
	  else if (c == '2')
	    {
	      event->key.string = g_memdup ("\0\0", 2);
	      event->key.length = 1;
	      buf[0] = '\0';
	      goto out;
	    }
	  else if (c >= '3' && c <= '7') c -= ('3' - '\033');
	  else if (c == '8') c = '\177';
	  else if (c == '/') c = '_' & 0x1F;
	}
      
      len = g_unichar_to_utf8 (c, buf);
      buf[len] = '\0';
      
      event->key.string = g_locale_from_utf8 (buf, len,
					      NULL, &bytes_written,
					      NULL);
      if (event->key.string)
	event->key.length = bytes_written;
    }
  else if (event->key.keyval == GDK_Escape)
    {
      event->key.length = 1;
      event->key.string = g_strdup ("\033");
    }
  else if (event->key.keyval == GDK_Return ||
	  event->key.keyval == GDK_KP_Enter)
    {
      event->key.length = 1;
      event->key.string = g_strdup ("\r");
    }

  if (!event->key.string)
    {
      event->key.length = 0;
      event->key.string = g_strdup ("");
    }
  
 out:
#ifdef G_ENABLE_DEBUG
  if (_gdk_debug_flags & GDK_DEBUG_EVENTS)
    {
      g_message ("%s:\t\twindow: %ld	 key: %12s  %d",
		 event->type == GDK_KEY_PRESS ? "key press  " : "key release",
		 xevent->xkey.window,
		 event->key.keyval ? gdk_keyval_name (event->key.keyval) : "(none)",
		 event->key.keyval);
  
      if (event->key.length > 0)
	g_message ("\t\tlength: %4d string: \"%s\"",
		   event->key.length, buf);
    }
#endif /* G_ENABLE_DEBUG */  
  return;
}

/**
 * gdk_x11_register_standard_event_type:
 * @display: a #GdkDisplay
 * @event_base: first event type code to register
 * @n_events: number of event type codes to register
 * 
 * Registers interest in receiving extension events with type codes
 * between @event_base and <literal>event_base + n_events - 1</literal>.
 * The registered events must have the window field in the same place
 * as core X events (this is not the case for e.g. XKB extension events).
 *
 * If an event type is registered, events of this type will go through
 * global and window-specific filters (see gdk_window_add_filter()). 
 * Unregistered events will only go through global filters.
 * GDK may register the events of some X extensions on its own.
 * 
 * This function should only be needed in unusual circumstances, e.g.
 * when filtering XInput extension events on the root window.
 *
 * Since: 2.4
 **/
void
gdk_x11_register_standard_event_type (GdkDisplay          *display,
				      gint                 event_base,
				      gint                 n_events)
{
  GdkEventTypeX11 *event_type;
  GdkDisplayX11 *display_x11;

  display_x11 = GDK_DISPLAY_X11 (display);
  event_type = g_new (GdkEventTypeX11, 1);

  event_type->base = event_base;
  event_type->n_events = n_events;

  display_x11->event_types = g_slist_prepend (display_x11->event_types, event_type);
}

/* Return the window this has to do with, if any, rather
 * than the frame or root window that was selecting
 * for substructure
 */
static void
get_real_window (GdkDisplay *display,
		 XEvent     *event,
		 Window     *event_window,
		 Window     *filter_window)
{
  /* Core events all have an event->xany.window field, but that's
   * not true for extension events
   */
  if (event->type >= KeyPress &&
      event->type <= MappingNotify)
    {
      *filter_window = event->xany.window;
      switch (event->type)
	{      
	case CreateNotify:
	  *event_window = event->xcreatewindow.window;
	  break;
	case DestroyNotify:
	  *event_window = event->xdestroywindow.window;
	  break;
	case UnmapNotify:
	  *event_window = event->xunmap.window;
	  break;
	case MapNotify:
	  *event_window = event->xmap.window;
	  break;
	case MapRequest:
	  *event_window = event->xmaprequest.window;
	  break;
	case ReparentNotify:
	  *event_window = event->xreparent.window;
	  break;
	case ConfigureNotify:
	  *event_window = event->xconfigure.window;
	  break;
	case ConfigureRequest:
	  *event_window = event->xconfigurerequest.window;
	  break;
	case GravityNotify:
	  *event_window = event->xgravity.window;
	  break;
	case CirculateNotify:
	  *event_window = event->xcirculate.window;
	  break;
	case CirculateRequest:
	  *event_window = event->xcirculaterequest.window;
	  break;
	default:
	  *event_window = event->xany.window;
	}
    }
  else
    {
      GdkDisplayX11 *display_x11 = GDK_DISPLAY_X11 (display);
      GSList *tmp_list;

      for (tmp_list = display_x11->event_types;
	   tmp_list;
	   tmp_list = tmp_list->next)
	{
	  GdkEventTypeX11 *event_type = tmp_list->data;

	  if (event->type >= event_type->base &&
	      event->type < event_type->base + event_type->n_events)
	    {
	      *event_window = event->xany.window;
	      *filter_window = event->xany.window;
	      return;
	    }
	}
	   
      *event_window = None;
      *filter_window = None;
    }
}

#ifdef G_ENABLE_DEBUG
static const char notify_modes[][19] = {
  "NotifyNormal",
  "NotifyGrab",
  "NotifyUngrab",
  "NotifyWhileGrabbed"
};

static const char notify_details[][23] = {
  "NotifyAncestor",
  "NotifyVirtual",
  "NotifyInferior",
  "NotifyNonlinear",
  "NotifyNonlinearVirtual",
  "NotifyPointer",
  "NotifyPointerRoot",
  "NotifyDetailNone"
};
#endif

static void
set_user_time (GdkWindow *window,
	       GdkEvent  *event)
{
  g_return_if_fail (event != NULL);

  window = gdk_window_get_toplevel (event->client.window);
  g_return_if_fail (GDK_IS_WINDOW (window));

  /* If an event doesn't have a valid timestamp, we shouldn't use it
   * to update the latest user interaction time.
   */
  if (gdk_event_get_time (event) != GDK_CURRENT_TIME)
    gdk_x11_window_set_user_time (gdk_window_get_toplevel (window),
                                  gdk_event_get_time (event));
}

static gboolean
gdk_event_translate (GdkDisplay *display,
		     GdkEvent   *event,
		     XEvent     *xevent,
		     gboolean    return_exposes)
{
  
  GdkWindow *window;
  GdkWindowObject *window_private;
  GdkWindow *filter_window;
  GdkWindowImplX11 *window_impl = NULL;
  gboolean return_val;
  gint xoffset, yoffset;
  GdkScreen *screen = NULL;
  GdkScreenX11 *screen_x11 = NULL;
  GdkToplevelX11 *toplevel = NULL;
  GdkDisplayX11 *display_x11 = GDK_DISPLAY_X11 (display);
  Window xwindow, filter_xwindow;
  
  return_val = FALSE;

  /* init these, since the done: block uses them */
  window = NULL;
  window_private = NULL;
  event->any.window = NULL;

  if (_gdk_default_filters)
    {
      /* Apply global filters */
      GdkFilterReturn result;
      result = gdk_event_apply_filters (xevent, event,
                                        _gdk_default_filters);
      
      if (result != GDK_FILTER_CONTINUE)
        {
          return_val = (result == GDK_FILTER_TRANSLATE) ? TRUE : FALSE;
          goto done;
        }
    }  

  /* Find the GdkWindow that this event relates to.
   * Basically this means substructure events
   * are reported same as structure events
   */
  get_real_window (display, xevent, &xwindow, &filter_xwindow);
  
  window = gdk_window_lookup_for_display (display, xwindow);
  /* We may receive events such as NoExpose/GraphicsExpose
   * and ShmCompletion for pixmaps
   */
  if (window && !GDK_IS_WINDOW (window))
    window = NULL;
  window_private = (GdkWindowObject *) window;

  /* We always run the filters for the window where the event
   * is delivered, not the window that it relates to
   */
  if (filter_xwindow == xwindow)
    filter_window = window;
  else
    {
      filter_window = gdk_window_lookup_for_display (display, filter_xwindow);
      if (filter_window && !GDK_IS_WINDOW (filter_window))
	filter_window = NULL;
    }

  if (window)
    {
      screen = GDK_WINDOW_SCREEN (window);
      screen_x11 = GDK_SCREEN_X11 (screen);
      toplevel = _gdk_x11_window_get_toplevel (window);
    }
    
  if (window != NULL)
    {
      window_impl = GDK_WINDOW_IMPL_X11 (window_private->impl);
      
      /* Move key events on focus window to the real toplevel, and
       * filter out all other events on focus window
       */          
      if (toplevel && xwindow == toplevel->focus_window)
	{
	  switch (xevent->type)
	    {
	    case KeyPress:
	    case KeyRelease:
	      xwindow = GDK_WINDOW_XID (window);
	      xevent->xany.window = xwindow;
	      break;
	    default:
	      return FALSE;
	    }
	}

      g_object_ref (window);
    }