gdkdnd-x11.c 96.8 KB
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/* GDK - The GIMP Drawing Kit
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 * Copyright (C) 1995-1999 Peter Mattis, Spencer Kimball and Josh MacDonald
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 *
 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
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/*
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 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
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 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

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#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <string.h>
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#include "gdk.h"          /* For gdk_flush() */
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#include "gdkx.h"
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#include "gdkasync.h"
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#include "gdkdnd.h"
#include "gdkproperty.h"
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#include "gdkprivate-x11.h"
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#include "gdkinternals.h"
#include "gdkscreen-x11.h"
#include "gdkdisplay-x11.h"
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typedef struct _GdkDragContextPrivateX11 GdkDragContextPrivateX11;
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typedef enum {
  GDK_DRAG_STATUS_DRAG,
  GDK_DRAG_STATUS_MOTION_WAIT,
  GDK_DRAG_STATUS_ACTION_WAIT,
  GDK_DRAG_STATUS_DROP
} GtkDragStatus;

typedef struct {
  guint32 xid;
  gint x, y, width, height;
  gboolean mapped;
} GdkCacheChild;

typedef struct {
  GList *children;
  GHashTable *child_hash;
  guint old_event_mask;
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  GdkScreen *screen;
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} GdkWindowCache;

/* Structure that holds information about a drag in progress.
 * this is used on both source and destination sides.
 */
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struct _GdkDragContextPrivateX11 {
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  GdkDragContext context;

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  Atom motif_selection;
  Atom xdnd_selection;
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  guint   ref_count;

  guint16 last_x;		/* Coordinates from last event */
  guint16 last_y;
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  GdkDragAction old_action;	  /* The last action we sent to the source */
  GdkDragAction old_actions;	  /* The last actions we sent to the source */
  GdkDragAction xdnd_actions;     /* What is currently set in XdndActionList */
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  Window dest_xid;              /* The last window we looked up */
  Window drop_xid;            /* The (non-proxied) window that is receiving drops */
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  guint xdnd_targets_set : 1;   /* Whether we've already set XdndTypeList */
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  guint xdnd_actions_set : 1;   /* Whether we've already set XdndActionList */
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  guint xdnd_have_actions : 1; /* Whether an XdndActionList was provided */
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  guint motif_targets_set : 1;  /* Whether we've already set motif initiator info */
  guint drag_status : 4;	/* current status of drag */

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  GSList *window_caches;
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};

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#define PRIVATE_DATA(context) ((GdkDragContextPrivateX11 *) GDK_DRAG_CONTEXT (context)->windowing_data)

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/* Forward declarations */

static void gdk_window_cache_destroy (GdkWindowCache *cache);

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static void motif_read_target_table (GdkDisplay *display);

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static GdkFilterReturn motif_dnd_filter (GdkXEvent *xev,
					 GdkEvent  *event,
					 gpointer   data);

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static GdkFilterReturn xdnd_enter_filter    (GdkXEvent *xev,
					     GdkEvent  *event,
					     gpointer   data);
static GdkFilterReturn xdnd_leave_filter    (GdkXEvent *xev,
					     GdkEvent  *event,
					     gpointer   data);
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static GdkFilterReturn xdnd_position_filter (GdkXEvent *xev,
					     GdkEvent  *event,
					     gpointer   data);
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static GdkFilterReturn xdnd_status_filter   (GdkXEvent *xev,
					     GdkEvent  *event,
					     gpointer   data);
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static GdkFilterReturn xdnd_finished_filter (GdkXEvent *xev,
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					     GdkEvent  *event,
					     gpointer   data);
static GdkFilterReturn xdnd_drop_filter     (GdkXEvent *xev,
					     GdkEvent  *event,
					     gpointer   data);
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static void   xdnd_manage_source_filter (GdkDragContext *context,
					 GdkWindow      *window,
					 gboolean        add_filter);

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static void gdk_drag_context_init       (GdkDragContext      *dragcontext);
static void gdk_drag_context_class_init (GdkDragContextClass *klass);
static void gdk_drag_context_finalize   (GObject              *object);
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static gpointer parent_class = NULL;
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static GList *contexts;

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const static struct {
  const char *atom_name;
  GdkFilterFunc func;
} xdnd_filters[] = {
  { "XdndEnter",    xdnd_enter_filter },
  { "XdndLeave",    xdnd_leave_filter },
  { "XdndPosition", xdnd_position_filter },
  { "XdndStatus",   xdnd_status_filter },
  { "XdndFinished", xdnd_finished_filter },
  { "XdndDrop",     xdnd_drop_filter },
};
	      
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GType
gdk_drag_context_get_type (void)
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{
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  static GType object_type = 0;

  if (!object_type)
    {
      static const GTypeInfo object_info =
      {
        sizeof (GdkDragContextClass),
        (GBaseInitFunc) NULL,
        (GBaseFinalizeFunc) NULL,
        (GClassInitFunc) gdk_drag_context_class_init,
        NULL,           /* class_finalize */
        NULL,           /* class_data */
        sizeof (GdkDragContext),
        0,              /* n_preallocs */
        (GInstanceInitFunc) gdk_drag_context_init,
      };
      
      object_type = g_type_register_static (G_TYPE_OBJECT,
                                            "GdkDragContext",
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                                            &object_info, 0);
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    }
  
  return object_type;
}
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static void
gdk_drag_context_init (GdkDragContext *dragcontext)
{
  GdkDragContextPrivateX11 *private;
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  private = g_new0 (GdkDragContextPrivateX11, 1);
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  dragcontext->windowing_data = private;
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  contexts = g_list_prepend (contexts, dragcontext);
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}

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static void
gdk_drag_context_class_init (GdkDragContextClass *klass)
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{
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  GObjectClass *object_class = G_OBJECT_CLASS (klass);

  parent_class = g_type_class_peek_parent (klass);
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  object_class->finalize = gdk_drag_context_finalize;
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}

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static void
gdk_drag_context_finalize (GObject *object)
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{
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  GdkDragContext *context = GDK_DRAG_CONTEXT (object);
  GdkDragContextPrivateX11 *private = PRIVATE_DATA (context);
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  GSList *tmp_list;
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  g_list_free (context->targets);

  if (context->source_window)
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    {
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      if ((context->protocol == GDK_DRAG_PROTO_XDND) &&
          !context->is_source)
        xdnd_manage_source_filter (context, context->source_window, FALSE);
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      g_object_unref (context->source_window);
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    }
  
  if (context->dest_window)
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    g_object_unref (context->dest_window);
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  for (tmp_list = private->window_caches; tmp_list; tmp_list = tmp_list->next)
    gdk_window_cache_destroy (tmp_list->data);
  g_slist_free (private->window_caches);
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  contexts = g_list_remove (contexts, context);
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  g_free (private);
  
  G_OBJECT_CLASS (parent_class)->finalize (object);
}
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/* Drag Contexts */

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/**
 * gdk_drag_context_new:
 * 
 * Creates a new #GdkDragContext.
 * 
 * Return value: the newly created #GdkDragContext.
 **/
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GdkDragContext *
gdk_drag_context_new        (void)
{
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  return g_object_new (gdk_drag_context_get_type (), NULL);
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}

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/**
 * gdk_drag_context_ref:
 * @context: a #GdkDragContext.
 * 
 * Deprecated function; use g_object_ref() instead.
 **/
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void            
gdk_drag_context_ref (GdkDragContext *context)
{
  g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
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  g_object_ref (context);
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}
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/**
 * gdk_drag_context_unref:
 * @context: a #GdkDragContext.
 * 
 * Deprecated function; use g_object_unref() instead.
 **/
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void            
gdk_drag_context_unref (GdkDragContext *context)
{
  g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
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  g_object_unref (context);
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}

static GdkDragContext *
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gdk_drag_context_find (GdkDisplay *display,
		       gboolean    is_source,
		       Window      source_xid,
		       Window      dest_xid)
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{
  GList *tmp_list = contexts;
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  GdkDragContext *context;
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  GdkDragContextPrivateX11 *private;
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  Window context_dest_xid;
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  while (tmp_list)
    {
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      context = (GdkDragContext *)tmp_list->data;
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      private = PRIVATE_DATA (context);
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      if ((context->source_window && gdk_drawable_get_display (context->source_window) != display) ||
	  (context->dest_window && gdk_drawable_get_display (context->dest_window) != display))
	continue;

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      context_dest_xid = context->dest_window ? 
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                            (private->drop_xid ?
                              private->drop_xid :
                              GDK_DRAWABLE_XID (context->dest_window)) :
	                     None;
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      if ((!context->is_source == !is_source) &&
	  ((source_xid == None) || (context->source_window &&
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	    (GDK_DRAWABLE_XID (context->source_window) == source_xid))) &&
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	  ((dest_xid == None) || (context_dest_xid == dest_xid)))
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	return context;
      
      tmp_list = tmp_list->next;
    }
  
  return NULL;
}

/* Utility functions */

static void
gdk_window_cache_add (GdkWindowCache *cache,
		      guint32 xid,
		      gint x, gint y, gint width, gint height, 
		      gboolean mapped)
{
  GdkCacheChild *child = g_new (GdkCacheChild, 1);

  child->xid = xid;
  child->x = x;
  child->y = y;
  child->width = width;
  child->height = height;
  child->mapped = mapped;

  cache->children = g_list_prepend (cache->children, child);
  g_hash_table_insert (cache->child_hash, GUINT_TO_POINTER (xid), 
		       cache->children);
}

static GdkFilterReturn
gdk_window_cache_filter (GdkXEvent *xev,
			 GdkEvent  *event,
			 gpointer   data)
{
  XEvent *xevent = (XEvent *)xev;
  GdkWindowCache *cache = data;

  switch (xevent->type)
    {
    case CirculateNotify:
      break;
    case ConfigureNotify:
      {
	XConfigureEvent *xce = &xevent->xconfigure;
	GList *node;

	node = g_hash_table_lookup (cache->child_hash, 
				    GUINT_TO_POINTER (xce->window));
	if (node) 
	  {
	    GdkCacheChild *child = node->data;
	    child->x = xce->x; 
	    child->y = xce->y;
	    child->width = xce->width; 
	    child->height = xce->height;
	    if (xce->above == None && (node->next))
	      {
		GList *last = g_list_last (cache->children);
		cache->children = g_list_remove_link (cache->children, node);
		last->next = node;
		node->next = NULL;
		node->prev = last;
	      }
	    else
	      {
		GList *above_node = g_hash_table_lookup (cache->child_hash, 
							 GUINT_TO_POINTER (xce->above));
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		if (above_node && node->next != above_node)
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		  {
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		    /* Put the window above (before in the list) above_node
		     */
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		    cache->children = g_list_remove_link (cache->children, node);
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		    node->prev = above_node->prev;
		    if (node->prev)
		      node->prev->next = node;
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		    else
		      cache->children = node;
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		    node->next = above_node;
		    above_node->prev = node;
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		  }
	      }
	  }
	break;
      }
    case CreateNotify:
      {
	XCreateWindowEvent *xcwe = &xevent->xcreatewindow;
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	if (!g_hash_table_lookup (cache->child_hash, 
				  GUINT_TO_POINTER (xcwe->window))) 
	  gdk_window_cache_add (cache, xcwe->window, 
				xcwe->x, xcwe->y, xcwe->width, xcwe->height,
				FALSE);
	break;
      }
    case DestroyNotify:
      {
	XDestroyWindowEvent *xdwe = &xevent->xdestroywindow;
	GList *node;

	node = g_hash_table_lookup (cache->child_hash, 
				    GUINT_TO_POINTER (xdwe->window));
	if (node) 
	  {
	    g_hash_table_remove (cache->child_hash,
				 GUINT_TO_POINTER (xdwe->window));
	    cache->children = g_list_remove_link (cache->children, node);
	    g_free (node->data);
	    g_list_free_1 (node);
	  }
	break;
      }
    case MapNotify:
      {
	XMapEvent *xme = &xevent->xmap;
	GList *node;

	node = g_hash_table_lookup (cache->child_hash, 
				    GUINT_TO_POINTER (xme->window));
	if (node) 
	  {
	    GdkCacheChild *child = node->data;
	    child->mapped = TRUE;
	  }
	break;
      }
    case ReparentNotify:
      break;
    case UnmapNotify:
      {
	XMapEvent *xume = &xevent->xmap;
	GList *node;

	node = g_hash_table_lookup (cache->child_hash, 
				    GUINT_TO_POINTER (xume->window));
	if (node) 
	  {
	    GdkCacheChild *child = node->data;
	    child->mapped = FALSE;
	  }
	break;
      }
    default:
      return GDK_FILTER_CONTINUE;
    }
  return GDK_FILTER_REMOVE;
}

static GdkWindowCache *
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gdk_window_cache_new (GdkScreen *screen)
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{
  XWindowAttributes xwa;
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  Display *xdisplay = GDK_SCREEN_XDISPLAY (screen);
  GdkWindow *root_window = gdk_screen_get_root_window (screen);
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  GdkChildInfoX11 *children;
  guint nchildren, i;
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  GdkWindowCache *result = g_new (GdkWindowCache, 1);

  result->children = NULL;
  result->child_hash = g_hash_table_new (g_direct_hash, NULL);
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  result->screen = screen;
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  XGetWindowAttributes (xdisplay, GDK_WINDOW_XWINDOW (root_window), &xwa);
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  result->old_event_mask = xwa.your_event_mask;
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  XSelectInput (xdisplay, GDK_WINDOW_XWINDOW (root_window),
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		result->old_event_mask | SubstructureNotifyMask);
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  gdk_window_add_filter (root_window, gdk_window_cache_filter, result);
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  if (!_gdk_x11_get_window_child_info (gdk_screen_get_display (screen),
				       GDK_WINDOW_XWINDOW (root_window),
				       FALSE, &children, &nchildren))
    return result;
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  for (i = 0; i < nchildren ; i++)
    {
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      gdk_window_cache_add (result, children[i].window,
			    children[i].x, children[i].y, children[i].width, children[i].height,
			    children[i].is_mapped);
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    }

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  g_free (children);
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  return result;
}

static void
gdk_window_cache_destroy (GdkWindowCache *cache)
{
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  GdkWindow *root_window = gdk_screen_get_root_window (cache->screen);
  
  XSelectInput (GDK_WINDOW_XDISPLAY (root_window), 
		GDK_WINDOW_XWINDOW (root_window),
		cache->old_event_mask);
  gdk_window_remove_filter (root_window, gdk_window_cache_filter, cache);
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  g_list_foreach (cache->children, (GFunc)g_free, NULL);
  g_list_free (cache->children);
  g_hash_table_destroy (cache->child_hash);
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  g_free (cache);
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}

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static gboolean
window_has_wm_state (GdkDisplay *display,
		     Window      win)
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{
  Atom type = None;
  int format;
  unsigned long nitems, after;
  unsigned char *data;
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  if (XGetWindowProperty (GDK_DISPLAY_XDISPLAY(display), win,
			  gdk_x11_get_xatom_by_name_for_display (display, "WM_STATE"),
			  0, 0, False, AnyPropertyType,
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			  &type, &format, &nitems, &after, &data) != Success)
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    return FALSE;
     
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  if (type != None)
    {
      XFree (data);
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      return TRUE;
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    }

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  return FALSE;
}

static Window
get_client_window_at_coords_recurse (GdkDisplay *display,
				     Window      win,
				     gint        x,
				     gint        y)
{
  GdkChildInfoX11 *children;
  unsigned int nchildren;
  int i;
  gboolean found_child = FALSE;
  GdkChildInfoX11 child;

  if (!_gdk_x11_get_window_child_info (display, win, TRUE,
				       &children, &nchildren))
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    return None;
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  for (i = nchildren - 1; (i >= 0) && !found_child; i--)
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    {
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      GdkChildInfoX11 *cur_child = &children[i];
       
      if ((cur_child->is_mapped) && (cur_child->window_class == InputOutput) &&
	  (x >= cur_child->x) && (x < cur_child->x + cur_child->width) &&
	  (y >= cur_child->y) && (y < cur_child->y + cur_child->height))
 	{
	  x -= cur_child->x;
	  y -= cur_child->y;
	  child = *cur_child;
	  found_child = TRUE;
 	}
    }
   
  g_free (children);
 
  if (found_child)
    {
      if (child.has_wm_state)
	return child.window;
      else
	return get_client_window_at_coords_recurse (display, child.window, x, y);
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    }
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  else
    return None;
}

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static Window 
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get_client_window_at_coords (GdkWindowCache *cache,
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			     Window          ignore,
			     gint            x_root,
			     gint            y_root)
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{
  GList *tmp_list;
  Window retval = None;

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  gdk_error_trap_push ();
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  tmp_list = cache->children;

  while (tmp_list && !retval)
    {
      GdkCacheChild *child = tmp_list->data;

      if ((child->xid != ignore) && (child->mapped))
	{
	  if ((x_root >= child->x) && (x_root < child->x + child->width) &&
	      (y_root >= child->y) && (y_root < child->y + child->height))
	    {
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	      if (window_has_wm_state (gdk_screen_get_display (cache->screen), child->xid))
		retval = child->xid;
	      else
		retval = get_client_window_at_coords_recurse (gdk_screen_get_display (cache->screen),
							      child->xid,
							      x_root - child->x,
							      y_root - child->y);
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	      if (!retval)
		retval = child->xid;
	    }
	  
	}
      tmp_list = tmp_list->next;
    }

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  gdk_error_trap_pop ();
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  if (retval)
    return retval;
  else
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    return GDK_WINDOW_XWINDOW (gdk_screen_get_root_window (cache->screen));
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}

/*************************************************************
 ***************************** MOTIF *************************
 *************************************************************/

/* values used in the message type for Motif DND */
enum {
    XmTOP_LEVEL_ENTER,
    XmTOP_LEVEL_LEAVE,
    XmDRAG_MOTION,
    XmDROP_SITE_ENTER,
    XmDROP_SITE_LEAVE,
    XmDROP_START,
    XmDROP_FINISH,
    XmDRAG_DROP_FINISH,
    XmOPERATION_CHANGED
};

/* Values used to specify type of protocol to use */
enum {
    XmDRAG_NONE,
    XmDRAG_DROP_ONLY,
    XmDRAG_PREFER_PREREGISTER,
    XmDRAG_PREREGISTER,
    XmDRAG_PREFER_DYNAMIC,
    XmDRAG_DYNAMIC,
    XmDRAG_PREFER_RECEIVER
};

/* Operation codes */
enum {
  XmDROP_NOOP,
  XmDROP_MOVE = 0x01,
  XmDROP_COPY = 0x02,
  XmDROP_LINK = 0x04
};

/* Drop site status */
enum {
  XmNO_DROP_SITE = 0x01,
  XmDROP_SITE_INVALID = 0x02,
  XmDROP_SITE_VALID = 0x03
};

/* completion status */
enum {
  XmDROP,
  XmDROP_HELP,
  XmDROP_CANCEL,
  XmDROP_INTERRUPT
};

/* Byte swapping routines. The motif specification leaves it
 * up to us to save a few bytes in the client messages
 */
static gchar local_byte_order = '\0';

#ifdef G_ENABLE_DEBUG
static void
print_target_list (GList *targets)
{
  while (targets)
    {
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      gchar *name = gdk_atom_name (GDK_POINTER_TO_ATOM (targets->data));
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      g_message ("\t%s", name);
      g_free (name);
      targets = targets->next;
    }
}
#endif /* G_ENABLE_DEBUG */

static void
init_byte_order (void)
{
  guint32 myint = 0x01020304;
  local_byte_order = (*(gchar *)&myint == 1) ? 'B' : 'l';
}

static guint16
card16_to_host (guint16 x, gchar byte_order) {
  if (byte_order == local_byte_order)
    return x;
  else
    return (x << 8) | (x >> 8);
}

static guint32
card32_to_host (guint32 x, gchar byte_order) {
  if (byte_order == local_byte_order)
    return x;
  else
    return (x << 24) | ((x & 0xff00) << 8) | ((x & 0xff0000) >> 8) | (x >> 24);
}

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/* Motif packs together fields of varying length into the
 * client message. We can't rely on accessing these
 * through data.s[], data.l[], etc, because on some architectures
 * (i.e., Alpha) these won't be valid for format == 8. 
 */

#define MOTIF_XCLIENT_BYTE(xevent,i) \
  (xevent)->xclient.data.b[i]
#define MOTIF_XCLIENT_SHORT(xevent,i) \
  ((gint16 *)&((xevent)->xclient.data.b[0]))[i]
#define MOTIF_XCLIENT_LONG(xevent,i) \
  ((gint32 *)&((xevent)->xclient.data.b[0]))[i]

#define MOTIF_UNPACK_BYTE(xevent,i) MOTIF_XCLIENT_BYTE(xevent,i)
#define MOTIF_UNPACK_SHORT(xevent,i) \
  card16_to_host (MOTIF_XCLIENT_SHORT(xevent,i), MOTIF_XCLIENT_BYTE(xevent, 1))
#define MOTIF_UNPACK_LONG(xevent,i) \
  card32_to_host (MOTIF_XCLIENT_LONG(xevent,i), MOTIF_XCLIENT_BYTE(xevent, 1))
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/***** Dest side ***********/

/* Property placed on source windows */
typedef struct _MotifDragInitiatorInfo {
  guint8 byte_order;
  guint8 protocol_version;
  guint16 targets_index;
  guint32 selection_atom;
} MotifDragInitiatorInfo;

/* Header for target table on the drag window */
typedef struct _MotifTargetTableHeader {
  guchar byte_order;
  guchar protocol_version;
  guint16 n_lists;
  guint32 total_size;
} MotifTargetTableHeader;

/* Property placed on target windows */
typedef struct _MotifDragReceiverInfo {
  guint8 byte_order;
  guint8 protocol_version;
  guint8 protocol_style;
  guint8 pad;
  guint32 proxy_window;
  guint16 num_drop_sites;
  guint16 padding;
  guint32 total_size;
} MotifDragReceiverInfo;

/* Target table handling */

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static GdkFilterReturn
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motif_drag_window_filter (GdkXEvent *xevent,
			  GdkEvent  *event,
			  gpointer data)
{
  XEvent *xev = (XEvent *)xevent;
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  GdkDisplay *display = GDK_WINDOW_DISPLAY (event->any.window); 
  GdkDisplayX11 *display_x11 = GDK_DISPLAY_X11 (display);
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  switch (xev->xany.type)
    {
    case DestroyNotify:
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      display_x11->motif_drag_window = None;
      display_x11->motif_drag_gdk_window = NULL;
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      break;
    case PropertyNotify:
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      if (display_x11->motif_target_lists &&
	  (xev->xproperty.atom == gdk_x11_get_xatom_by_name_for_display (display, "_MOTIF_DRAG_TARGETS")))
	motif_read_target_table (display);
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      break;
    }
  return GDK_FILTER_REMOVE;
}

static Window
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motif_lookup_drag_window (GdkDisplay *display,
			  Display    *lookup_xdisplay)
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{
  Window retval = None;
  gulong bytes_after, nitems;
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  Atom type;
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  gint format;
  guchar *data;

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  XGetWindowProperty (lookup_xdisplay, RootWindow (lookup_xdisplay, 0),
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		      gdk_x11_get_xatom_by_name_for_display (display, "_MOTIF_DRAG_WINDOW"),
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		      0, 1, FALSE,
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		      XA_WINDOW, &type, &format, &nitems, &bytes_after,
		      &data);
  
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  if ((format == 32) && (nitems == 1) && (bytes_after == 0))
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    {
      retval = *(Window *)data;
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      GDK_NOTE (DND, 
		g_message ("Found drag window %#lx\n", GDK_DISPLAY_X11 (display)->motif_drag_window));
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    }

  if (type != None)
    XFree (data);

  return retval;
}

/* Finds the window where global Motif drag information is stored.
 * If it doesn't exist and 'create' is TRUE, create one.
 */
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static Window 
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motif_find_drag_window (GdkDisplay *display,
			gboolean    create)
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{
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  GdkDisplayX11 *display_x11 = GDK_DISPLAY_X11 (display);
  
  if (!display_x11->motif_drag_window)
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    {
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      Atom motif_drag_window_atom = gdk_x11_get_xatom_by_name_for_display (display, "_MOTIF_DRAG_WINDOW");
      display_x11->motif_drag_window = motif_lookup_drag_window (display, display_x11->xdisplay);
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      if (!display_x11->motif_drag_window && create)
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	{
	  /* Create a persistant window. (Copied from LessTif) */
	  
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	  Display *persistant_xdisplay;
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	  XSetWindowAttributes attr;
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	  persistant_xdisplay = XOpenDisplay (gdk_display_get_name (display));
	  XSetCloseDownMode (persistant_xdisplay, RetainPermanent);
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	  XGrabServer (persistant_xdisplay);
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	  display_x11->motif_drag_window = motif_lookup_drag_window (display, persistant_xdisplay);
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	  if (!display_x11->motif_drag_window)
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	    {
	      attr.override_redirect = True;
	      attr.event_mask = PropertyChangeMask;
	      
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	       display_x11->motif_drag_window = 
		XCreateWindow (persistant_xdisplay, 
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			       RootWindow (persistant_xdisplay, 0),
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			      -100, -100, 10, 10, 0, 0,
			      InputOnly, CopyFromParent,
			      (CWOverrideRedirect | CWEventMask), &attr);
	      
	      GDK_NOTE (DND,
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			g_message ("Created drag window %#lx\n", display_x11->motif_drag_window));
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	      XChangeProperty (persistant_xdisplay, 
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			       RootWindow (persistant_xdisplay, 0),
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			       motif_drag_window_atom, XA_WINDOW,
			       32, PropModeReplace,
			       (guchar *)&motif_drag_window_atom, 1);

	    }
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	  XUngrabServer (persistant_xdisplay);
	  XCloseDisplay (persistant_xdisplay);
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	}

      /* There is a miniscule race condition here if the drag window
       * gets destroyed exactly now.
       */
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      if (display_x11->motif_drag_window)
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	{
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	  display_x11->motif_drag_gdk_window = 
	    gdk_window_foreign_new_for_display (display, display_x11->motif_drag_window);
	  gdk_window_add_filter (display_x11->motif_drag_gdk_window,
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				 motif_drag_window_filter,
				 NULL);
	}
    }

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  return display_x11->motif_drag_window;
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}

static void 
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motif_read_target_table (GdkDisplay *display)
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{
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  GdkDisplayX11 *display_x11 = GDK_DISPLAY_X11 (display);
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  gulong bytes_after, nitems;
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  Atom type;
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  gint format;
  gint i, j;
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  Atom motif_drag_targets_atom = gdk_x11_get_xatom_by_name_for_display (display, "_MOTIF_DRAG_TARGETS");
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  if (display_x11->motif_target_lists)
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    {
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      for (i=0; i<display_x11->motif_n_target_lists; i++)
	g_list_free (display_x11->motif_target_lists[i]);
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      g_free (display_x11->motif_target_lists);
      display_x11->motif_target_lists = NULL;
      display_x11->motif_n_target_lists = 0;
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    }

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  if (motif_find_drag_window (display, FALSE))
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    {
      MotifTargetTableHeader *header = NULL;
      guchar *target_bytes = NULL;
      guchar *p;
      gboolean success = FALSE;

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      gdk_error_trap_push ();
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      XGetWindowProperty (display_x11->xdisplay, 
			  display_x11->motif_drag_window, 
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			  motif_drag_targets_atom,
			  0, (sizeof(MotifTargetTableHeader)+3)/4, FALSE,
			  motif_drag_targets_atom, 
			  &type, &format, &nitems, &bytes_after,
			  (guchar **)&header);

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      if (gdk_error_trap_pop () || (format != 8) || (nitems < sizeof (MotifTargetTableHeader)))
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	goto error;

      header->n_lists = card16_to_host (header->n_lists, header->byte_order);
      header->total_size = card32_to_host (header->total_size, header->byte_order);

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      gdk_error_trap_push ();
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      XGetWindowProperty (display_x11->xdisplay, 
			  display_x11->motif_drag_window, 
		          motif_drag_targets_atom,
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			  (sizeof(MotifTargetTableHeader)+3)/4, 
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			  (header->total_size + 3)/4 - (sizeof(MotifTargetTableHeader) + 3)/4,
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			  FALSE,
			  motif_drag_targets_atom, &type, &format, &nitems, 
			  &bytes_after, &target_bytes);
      
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      if (gdk_error_trap_pop () || (format != 8) || (bytes_after != 0) || 
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	  (nitems != header->total_size - sizeof(MotifTargetTableHeader)))
	  goto error;

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      display_x11->motif_n_target_lists = header->n_lists;
      display_x11->motif_target_lists = g_new0 (GList *, display_x11->motif_n_target_lists);
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      p = target_bytes;
      for (i=0; i<header->n_lists; i++)
	{
	  gint n_targets;
	  guint32 *targets;
	  
	  if (p + sizeof(guint16) - target_bytes > nitems)
	    goto error;

	  n_targets = card16_to_host (*(gushort *)p, header->byte_order);
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	  /* We need to make a copy of the targets, since it may
	   * be unaligned
	   */
	  targets = g_new (guint32, n_targets);
	  memcpy (targets, p + sizeof(guint16), sizeof(guint32) * n_targets);
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	  p +=  sizeof(guint16) + n_targets * sizeof(guint32);
	  if (p - target_bytes > nitems)
	    goto error;

	  for (j=0; j<n_targets; j++)
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	    display_x11->motif_target_lists[i] = 
	      g_list_prepend (display_x11->motif_target_lists[i],
			      GUINT_TO_POINTER (card32_to_host (targets[j],
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								header->byte_order)));
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	  g_free (targets);
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	  display_x11->motif_target_lists[i] = g_list_reverse (display_x11->motif_target_lists[i]);
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	}

      success = TRUE;
      
    error:
      if (header)
	XFree (header);
      
      if (target_bytes)
	XFree (target_bytes);

      if (!success)
	{
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	  if (display_x11->motif_target_lists)
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	    {
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	      g_free (display_x11->motif_target_lists);
	      display_x11->motif_target_lists = NULL;
	      display_x11->motif_n_target_lists = 0;
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	    }
	  g_warning ("Error reading Motif target table\n");
	}
    }
}

static gint
targets_sort_func (gconstpointer a, gconstpointer b)
{
  return (GPOINTER_TO_UINT (a) < GPOINTER_TO_UINT (b)) ?
    -1 : ((GPOINTER_TO_UINT (a) > GPOINTER_TO_UINT (b)) ? 1 : 0);
}

/* Check if given (sorted) list is in the targets table */
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static gint
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motif_target_table_check (GdkDisplay *display,
			  GList      *sorted)
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{
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  GdkDisplayX11 *display_x11 = GDK_DISPLAY_X11 (display);
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  GList *tmp_list1, *tmp_list2;
  gint i;

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  for (i=0; i<display_x11->motif_n_target_lists; i++)
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    {
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      tmp_list1 = display_x11->motif_target_lists[i];
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      tmp_list2 = sorted;
      
      while (tmp_list1 && tmp_list2)
	{
	  if (tmp_list1->data != tmp_list2->data)
	    break;

	  tmp_list1 = tmp_list1->next;
	  tmp_list2 = tmp_list2->next;
	}
      if (!tmp_list1 && !tmp_list2)	/* Found it */
	return i;
    }

  return -1;
}

static gint
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motif_add_to_target_table (GdkDisplay *display,
			   GList      *targets) /* targets is list of GdkAtom */
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{
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  GdkDisplayX11 *display_x11 = GDK_DISPLAY_X11 (display);
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  GList *sorted = NULL;
  gint index = -1;
  gint i;
  GList *tmp_list;
  
  /* make a sorted copy of the list */
  
  while (targets)
    {
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      Atom xatom = gdk_x11_atom_to_xatom_for_display (display, GDK_POINTER_TO_ATOM (targets->data));
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      sorted = g_list_insert_sorted (sorted, GUINT_TO_POINTER (xatom), targets_sort_func);
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      targets = targets->next;
    }

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  /* First check if it is there already */
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  if (display_x11->motif_target_lists)
    index = motif_target_table_check (display, sorted);
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  /* We need to grab the server while doing this, to ensure
   * atomiticity. Ugh
   */

  if (index < 0)
    {
      /* We need to make sure that it exists _before_ we grab the
       * server, since we can't open a new connection after we
       * grab the server. 
       */
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      motif_find_drag_window (display, TRUE);
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      gdk_x11_display_grab (display);
      motif_read_target_table (display);
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      /* Check again, in case it was added in the meantime */
      
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      if (display_x11->motif_target_lists)
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	index = motif_target_table_check (display, sorted);
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      if (index < 0)
	{
	  guint32 total_size = 0;
	  guchar *data;
	  guchar *p;
	  guint16 *p16;
	  MotifTargetTableHeader *header;
	  
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	  if (!display_x11->motif_target_lists)
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	    {
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	      display_x11->motif_target_lists = g_new (GList *, 1);
	      display_x11->motif_n_target_lists = 1;
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	    }
	  else
	    {
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	      display_x11->motif_n_target_lists++;
	      display_x11->motif_target_lists = g_realloc (display_x11->motif_target_lists,
							   sizeof(GList *) * display_x11->motif_n_target_lists);
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	    }
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	  display_x11->motif_target_lists[display_x11->motif_n_target_lists - 1] = sorted;
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	  sorted = NULL;