gdkdnd-x11.c

linux下电话本所依赖的一些图形库

/*************************************************************
 ***************************** XDND **************************
 *************************************************************/

/* Utility functions */

static struct {
  const gchar *name;
  GdkAtom atom;
  GdkDragAction action;
} xdnd_actions_table[] = {
    { "XdndActionCopy",    None, GDK_ACTION_COPY },
    { "XdndActionMove",    None, GDK_ACTION_MOVE },
    { "XdndActionLink",    None, GDK_ACTION_LINK },
    { "XdndActionAsk",     None, GDK_ACTION_ASK  },
    { "XdndActionPrivate", None, GDK_ACTION_COPY },
  };

static const gint xdnd_n_actions = sizeof(xdnd_actions_table) / sizeof(xdnd_actions_table[0]);
static gboolean xdnd_actions_initialized = FALSE;

static void
xdnd_initialize_actions (void)
{
  gint i;
  
  xdnd_actions_initialized = TRUE;
  for (i=0; i < xdnd_n_actions; i++)
    xdnd_actions_table[i].atom = gdk_atom_intern (xdnd_actions_table[i].name, FALSE);
}

static GdkDragAction
xdnd_action_from_atom (GdkDisplay *display,
		       Atom        xatom)
{
  GdkAtom atom = gdk_x11_xatom_to_atom_for_display (display, xatom);
  gint i;

  if (!xdnd_actions_initialized)
    xdnd_initialize_actions();

  for (i=0; i<xdnd_n_actions; i++)
    if (atom == xdnd_actions_table[i].atom)
      return xdnd_actions_table[i].action;

  return 0;
}

static Atom
xdnd_action_to_atom (GdkDisplay    *display,
		     GdkDragAction  action)
{
  gint i;

  if (!xdnd_actions_initialized)
    xdnd_initialize_actions();

  for (i=0; i<xdnd_n_actions; i++)
    if (action == xdnd_actions_table[i].action)
      return gdk_x11_atom_to_xatom_for_display (display, xdnd_actions_table[i].atom);

  return None;
}

/* Source side */

static GdkFilterReturn 
xdnd_status_filter (GdkXEvent *xev,
		    GdkEvent  *event,
		    gpointer   data)
{
  GdkDisplay *display;
  XEvent *xevent = (XEvent *)xev;
  guint32 dest_window = xevent->xclient.data.l[0];
  guint32 flags = xevent->xclient.data.l[1];
  Atom action = xevent->xclient.data.l[4];
  GdkDragContext *context;

  if (!event->any.window ||
      gdk_window_get_window_type (event->any.window) == GDK_WINDOW_FOREIGN)
    return GDK_FILTER_CONTINUE;			/* Not for us */
  
  GDK_NOTE (DND, 
	    g_message ("XdndStatus: dest_window: %#x  action: %ld",
		       dest_window, action));

  display = gdk_drawable_get_display (event->any.window);
  context = gdk_drag_context_find (display, TRUE, xevent->xclient.window, dest_window);
  
  if (context)
    {
      GdkDragContextPrivateX11 *private = PRIVATE_DATA (context);
      if (private->drag_status == GDK_DRAG_STATUS_MOTION_WAIT)
	private->drag_status = GDK_DRAG_STATUS_DRAG;
      
      event->dnd.send_event = FALSE;
      event->dnd.type = GDK_DRAG_STATUS;
      event->dnd.context = context;
      g_object_ref (context);

      event->dnd.time = GDK_CURRENT_TIME; /* FIXME? */
      if (!(action != 0) != !(flags & 1))
	{
	  GDK_NOTE (DND,
		    g_warning ("Received status event with flags not corresponding to action!\n"));
	  action = 0;
	}

      context->action = xdnd_action_from_atom (display, action);

      return GDK_FILTER_TRANSLATE;
    }

  return GDK_FILTER_REMOVE;
}

static GdkFilterReturn 
xdnd_finished_filter (GdkXEvent *xev,
		      GdkEvent  *event,
		      gpointer   data)
{
  GdkDisplay *display;
  XEvent *xevent = (XEvent *)xev;
  guint32 dest_window = xevent->xclient.data.l[0];
  GdkDragContext *context;
  GdkDragContextPrivateX11 *private;

  if (!event->any.window ||
      gdk_window_get_window_type (event->any.window) == GDK_WINDOW_FOREIGN)
    return GDK_FILTER_CONTINUE;			/* Not for us */
  
  GDK_NOTE (DND, 
	    g_message ("XdndFinished: dest_window: %#x", dest_window));

  display = gdk_drawable_get_display (event->any.window);
  context = gdk_drag_context_find (display, TRUE, xevent->xclient.window, dest_window);
  
  if (context)
    {
      private = PRIVATE_DATA (context);
      if (private->version == 5)
	private->drop_failed = xevent->xclient.data.l[1] == 0;
      
      event->dnd.type = GDK_DROP_FINISHED;
      event->dnd.context = context;
      g_object_ref (context);

      event->dnd.time = GDK_CURRENT_TIME; /* FIXME? */

      return GDK_FILTER_TRANSLATE;
    }

  return GDK_FILTER_REMOVE;
}

static void
xdnd_set_targets (GdkDragContext *context)
{
  GdkDragContextPrivateX11 *private = PRIVATE_DATA (context);
  Atom *atomlist;
  GList *tmp_list = context->targets;
  gint i;
  gint n_atoms = g_list_length (context->targets);
  GdkDisplay *display = GDK_DRAWABLE_DISPLAY (context->source_window);

  atomlist = g_new (Atom, n_atoms);
  i = 0;
  while (tmp_list)
    {
      atomlist[i] = gdk_x11_atom_to_xatom_for_display (display, GDK_POINTER_TO_ATOM (tmp_list->data));
      tmp_list = tmp_list->next;
      i++;
    }

  XChangeProperty (GDK_DRAWABLE_XDISPLAY (context->source_window),
		   GDK_DRAWABLE_XID (context->source_window),
		   gdk_x11_get_xatom_by_name_for_display (display, "XdndTypeList"),
		   XA_ATOM, 32, PropModeReplace,
		   (guchar *)atomlist, n_atoms);

  g_free (atomlist);

  private->xdnd_targets_set = 1;
}

static void
xdnd_set_actions (GdkDragContext *context)
{
  GdkDragContextPrivateX11 *private = PRIVATE_DATA (context);
  Atom *atomlist;
  gint i;
  gint n_atoms;
  guint actions;
  GdkDisplay *display = GDK_DRAWABLE_DISPLAY (context->source_window);

  if (!xdnd_actions_initialized)
    xdnd_initialize_actions();
  
  actions = context->actions;
  n_atoms = 0;
  for (i=0; i<xdnd_n_actions; i++)
    {
      if (actions & xdnd_actions_table[i].action)
	{
	  actions &= ~xdnd_actions_table[i].action;
	  n_atoms++;
	}
    }

  atomlist = g_new (Atom, n_atoms);

  actions = context->actions;
  n_atoms = 0;
  for (i=0; i<xdnd_n_actions; i++)
    {
      if (actions & xdnd_actions_table[i].action)
	{
	  actions &= ~xdnd_actions_table[i].action;
	  atomlist[n_atoms] = gdk_x11_atom_to_xatom_for_display (display, xdnd_actions_table[i].atom);
	  n_atoms++;
	}
    }

  XChangeProperty (GDK_DRAWABLE_XDISPLAY (context->source_window),
		   GDK_DRAWABLE_XID (context->source_window),
		   gdk_x11_get_xatom_by_name_for_display (display, "XdndActionList"),
		   XA_ATOM, 32, PropModeReplace,
		   (guchar *)atomlist, n_atoms);

  g_free (atomlist);

  private->xdnd_actions_set = TRUE;
  private->xdnd_actions = context->actions;
}

static void
send_client_message_async_cb (Window   window,
			      gboolean success,
			      gpointer data)
{
  GdkDragContext *context = data;
  GDK_NOTE (DND,
	    g_message ("Got async callback for #%lx, success = %d",
		       window, success));

  /* On failure, we immediately continue with the protocol
   * so we don't end up blocking for a timeout
   */
  if (!success &&
      context->dest_window &&
      window == GDK_WINDOW_XID (context->dest_window))
    {
      GdkEvent temp_event;
      GdkDragContextPrivateX11 *private = PRIVATE_DATA (context);

      g_object_unref (context->dest_window);
      context->dest_window = NULL;
      context->action = 0;

      private->drag_status = GDK_DRAG_STATUS_DRAG;

      temp_event.dnd.type = GDK_DRAG_STATUS;
      temp_event.dnd.window = context->source_window;
      temp_event.dnd.send_event = TRUE;
      temp_event.dnd.context = context;
      temp_event.dnd.time = GDK_CURRENT_TIME;

      gdk_event_put (&temp_event);
    }

  g_object_unref (context);
}


static GdkDisplay *
gdk_drag_context_get_display (GdkDragContext *context)
{
  if (context->source_window)
    return GDK_DRAWABLE_DISPLAY (context->source_window);
  else if (context->dest_window)
    return GDK_DRAWABLE_DISPLAY (context->dest_window);

  g_assert_not_reached ();
  return NULL;
}

static void
send_client_message_async (GdkDragContext      *context,
			   Window               window, 
			   gboolean             propagate,
			   glong                event_mask,
			   XClientMessageEvent *event_send)
{
  GdkDisplay *display = gdk_drag_context_get_display (context);
  
  g_object_ref (context);

  _gdk_x11_send_client_message_async (display, window,
				      propagate, event_mask, event_send,
				      send_client_message_async_cb, context);
}

static gboolean
xdnd_send_xevent (GdkDragContext *context,
		  GdkWindow      *window, 
		  gboolean        propagate,
		  XEvent         *event_send)
{
  GdkDisplay *display = gdk_drag_context_get_display (context);
  Window xwindow;
  glong event_mask;

  g_assert (event_send->xany.type == ClientMessage);

  /* We short-circuit messages to ourselves */
  if (gdk_window_get_window_type (window) != GDK_WINDOW_FOREIGN)
    {
      gint i;
      
      for (i = 0; i < G_N_ELEMENTS (xdnd_filters); i++)
	{
	  if (gdk_x11_get_xatom_by_name_for_display (display, xdnd_filters[i].atom_name) ==
	      event_send->xclient.message_type)
	    {
	      GdkEvent temp_event;
	      temp_event.any.window = window;

	      if  ((*xdnd_filters[i].func) (event_send, &temp_event, NULL) == GDK_FILTER_TRANSLATE)
		{
		  gdk_event_put (&temp_event);
		  g_object_unref (temp_event.dnd.context);
		}
	      
	      return TRUE;
	    }
	}
    }

  xwindow = GDK_WINDOW_XWINDOW (window);
  
  if (_gdk_x11_display_is_root_window (display, xwindow))
    event_mask = ButtonPressMask;
  else
    event_mask = 0;
  
  send_client_message_async (context, xwindow, propagate, event_mask,
			     &event_send->xclient);

  return TRUE;
}
 
static void
xdnd_send_enter (GdkDragContext *context)
{
  XEvent xev;
  GdkDragContextPrivateX11 *private = PRIVATE_DATA (context);
  GdkDisplay *display = GDK_DRAWABLE_DISPLAY (context->dest_window);

  xev.xclient.type = ClientMessage;
  xev.xclient.message_type = gdk_x11_get_xatom_by_name_for_display (display, "XdndEnter");
  xev.xclient.format = 32;
  xev.xclient.window = private->drop_xid ? 
                           private->drop_xid : 
                           GDK_DRAWABLE_XID (context->dest_window);
  xev.xclient.data.l[0] = GDK_DRAWABLE_XID (context->source_window);
  xev.xclient.data.l[1] = (private->version << 24); /* version */
  xev.xclient.data.l[2] = 0;
  xev.xclient.data.l[3] = 0;
  xev.xclient.data.l[4] = 0;

  GDK_NOTE(DND,
	   g_message ("Sending enter source window %#lx XDND protocol version %d\n",
		      GDK_DRAWABLE_XID (context->source_window), private->version));
  if (g_list_length (context->targets) > 3)
    {
      if (!private->xdnd_targets_set)
	xdnd_set_targets (context);
      xev.xclient.data.l[1] |= 1;
    }
  else
    {
      GList *tmp_list = context->targets;
      gint i = 2;

      while (tmp_list)
	{
	  xev.xclient.data.l[i] = gdk_x11_atom_to_xatom_for_display (display,
								     GDK_POINTER_TO_ATOM (tmp_list->data));
	  tmp_list = tmp_list->next;
	  i++;
	}
    }

  if (!xdnd_send_xevent (context, context->dest_window,
			 FALSE, &xev))
    {
      GDK_NOTE (DND, 
		g_message ("Send event to %lx failed",
			   GDK_DRAWABLE_XID (context->dest_window)));
      g_object_unref (context->dest_window);
      context->dest_window = NULL;
    }
}

static void
xdnd_send_leave (GdkDragContext *context)
{
  GdkDisplay *display = GDK_DRAWABLE_DISPLAY (context->source_window);
  XEvent xev;

  GdkDragContextPrivateX11 *private = PRIVATE_DATA (context);

  xev.xclient.type = ClientMessage;
  xev.xclient.message_type = gdk_x11_get_xatom_by_name_for_display (display, "XdndLeave");
  xev.xclient.format = 32;
  xev.xclient.window = private->drop_xid ? 
                           private->drop_xid : 
                           GDK_DRAWABLE_XID (context->dest_window);
  xev.xclient.data.l[0] = GDK_DRAWABLE_XID (context->source_window);
  xev.xclient.data.l[1] = 0;
  xev.xclient.data.l[2] = 0;
  xev.xclient.data.l[3] = 0;
  xev.xclient.data.l[4] = 0;

  if (!xdnd_send_xevent (context, context->dest_window,
			 FALSE, &xev))
    {
      GDK_NOTE (DND, 
		g_message ("Send event to %lx failed",
			   GDK_DRAWABLE_XID (context->dest_window)));
      g_object_unref (context->dest_window);
      context->dest_window = NULL;
    }
}

static void
xdnd_send_drop (GdkDragContext *context, guint32 time)
{
  GdkDragContextPrivateX11 *private = PRIVATE_DATA (context);
  GdkDisplay *display = GDK_DRAWABLE_DISPLAY (context->source_window);
  XEvent xev;

  xev.xclient.type = ClientMessage;
  xev.xclient.message_type = gdk_x11_get_xatom_by_name_for_display (display, "XdndDrop");
  xev.xclient.format = 32;
  xev.xclient.window = private->drop_xid ? 
                           private->drop_xid : 
                           GDK_DRAWABLE_XID (context->dest_window);
  xev.xclient.data.l[0] = GDK_DRAWABLE_XID (context->source_window);
  xev.xclient.data.l[1] = 0;
  xev.xclient.data.l[2] = time;
  xev.xclient.data.l[3] = 0;
  xev.xclient.data.l[4] = 0;

  if (!xdnd_send_xevent (context, context->dest_window,
			 FALSE, &xev))
    {
      GDK_NOTE (DND, 
		g_message ("Send event to %lx failed",
			   GDK_DRAWABLE_XID (context->dest_window)));
      g_object_unref (context->dest_window);
      context->dest_window = NULL;
    }
}

static void
xdnd_send_motion (GdkDragContext *context,
		  gint            x_root, 
		  gint            y_root,