gdkdnd-x11.c 83.1 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
 * modify it under the terms of the GNU Library General Public
 * 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * 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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/*
 * Modified by the GTK+ Team and others 1997-1999.  See the AUTHORS
 * 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() */
#include "gdkdnd.h"
#include "gdkproperty.h"
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#include "gdkinternals.h"
#include "gdkprivate-x11.h"
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typedef struct _GdkDragContextPrivate GdkDragContextPrivate;
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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;
} GdkWindowCache;

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

  GdkAtom motif_selection;
  GdkAtom xdnd_selection;
  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 */

  GdkWindowCache *window_cache;
};

GdkDragContext *current_dest_drag = NULL;

/* Forward declarations */

static void gdk_window_cache_destroy (GdkWindowCache *cache);

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

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

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

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

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

static GdkFilterReturn xdnd_finished_filter (GdkXEvent *xev,
					    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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/* Drag Contexts */

static GList *contexts;

GdkDragContext *
gdk_drag_context_new        (void)
{
  GdkDragContextPrivate *result;

  result = g_new0 (GdkDragContextPrivate, 1);

  result->ref_count = 1;

  contexts = g_list_prepend (contexts, result);

  return (GdkDragContext *)result;
}

void            
gdk_drag_context_ref (GdkDragContext *context)
{
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  g_return_if_fail (context != NULL);

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  ((GdkDragContextPrivate *)context)->ref_count++;
}

void            
gdk_drag_context_unref (GdkDragContext *context)
{
  GdkDragContextPrivate *private = (GdkDragContextPrivate *)context;
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  g_return_if_fail (context != NULL);
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  g_return_if_fail (private->ref_count > 0);
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  private->ref_count--;
  
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  if (private->ref_count == 0)
    {
      g_dataset_destroy (private);
      
      g_list_free (context->targets);

      if (context->source_window)
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	{
	  if ((context->protocol == GDK_DRAG_PROTO_XDND) &&
	      !context->is_source)
	    xdnd_manage_source_filter (context, context->source_window, FALSE);

	  gdk_window_unref (context->source_window);
	}
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      if (context->dest_window)
	gdk_window_unref (context->dest_window);

      if (private->window_cache)
	gdk_window_cache_destroy (private->window_cache);

      contexts = g_list_remove (contexts, private);
      g_free (private);
    }
}

static GdkDragContext *
gdk_drag_context_find (gboolean is_source,
		       Window   source_xid,
		       Window   dest_xid)
{
  GList *tmp_list = contexts;
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  GdkDragContext *context;
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  GdkDragContextPrivate *private;
  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 = (GdkDragContextPrivate *)context;

      context_dest_xid = context->dest_window ? 
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	                   (private->drop_xid ?
			      private->drop_xid :
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			      GDK_DRAWABLE_XID (context->dest_window)) :
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	                   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));
		if (above_node && node->prev != above_node)
		  {
		    cache->children = g_list_remove_link (cache->children, node);
		    node->next = above_node->next;
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		    if (node->next)
		      node->next->prev = node;
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		    node->prev = above_node;
		    above_node->next = node;
		  }
	      }
	  }
	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 *
gdk_window_cache_new (void)
{
  XWindowAttributes xwa;
  Window root, parent, *children;
  unsigned int nchildren;
  int i;
  
  gint old_warnings = gdk_error_warnings;
  
  GdkWindowCache *result = g_new (GdkWindowCache, 1);

  result->children = NULL;
  result->child_hash = g_hash_table_new (g_direct_hash, NULL);

  XGetWindowAttributes (gdk_display, gdk_root_window, &xwa);
  result->old_event_mask = xwa.your_event_mask;
  XSelectInput (gdk_display, gdk_root_window,
		result->old_event_mask | SubstructureNotifyMask);
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  gdk_window_add_filter (gdk_parent_root, 
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			 gdk_window_cache_filter, result);
  
  gdk_error_code = 0;
  gdk_error_warnings = 0;

  if (XQueryTree(gdk_display, gdk_root_window, 
		 &root, &parent, &children, &nchildren) == 0)
    return result;
  
  for (i = 0; i < nchildren ; i++)
    {
      XGetWindowAttributes (gdk_display, children[i], &xwa);

      gdk_window_cache_add (result, children[i],
			    xwa.x, xwa.y, xwa.width, xwa.height,
			    xwa.map_state != IsUnmapped);

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      if (gdk_error_code)
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	gdk_error_code = 0;
      else
	{
	  gdk_window_cache_add (result, children[i],
				xwa.x, xwa.y, xwa.width, xwa.height,
				(xwa.map_state != IsUnmapped));
	}
    }

  XFree (children);

  gdk_error_warnings = old_warnings;

  return result;
}

static void
gdk_window_cache_destroy (GdkWindowCache *cache)
{
  XSelectInput (gdk_display, gdk_root_window, cache->old_event_mask);
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  gdk_window_remove_filter (gdk_parent_root, 
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			    gdk_window_cache_filter, cache);

  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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}

static Window
get_client_window_at_coords_recurse (Window  win,
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				     gint    x,
				     gint    y)
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{
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  Window root, tmp_parent, *children;
  unsigned int nchildren;
  int i;
  Window child = None;
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  Atom type = None;
  int format;
  unsigned long nitems, after;
  unsigned char *data;
  
  static Atom wm_state_atom = None;

  if (!wm_state_atom)
    wm_state_atom = gdk_atom_intern ("WM_STATE", FALSE);
    
  XGetWindowProperty (gdk_display, win, 
		      wm_state_atom, 0, 0, False, AnyPropertyType,
		      &type, &format, &nitems, &after, &data);
  
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  if (gdk_error_code)
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    {
      gdk_error_code = 0;
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      return None;
    }

  if (type != None)
    {
      XFree (data);
      return win;
    }

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#if 0
  /* This is beautiful! Damn Enlightenment and click-to-focus */
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  XTranslateCoordinates (gdk_display, gdk_root_window, win,
			 x_root, y_root, &dest_x, &dest_y, &child);

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  if (gdk_error_code)
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    {
      gdk_error_code = 0;
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      return None;
    }
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#else
  if (XQueryTree(gdk_display, win,
		 &root, &tmp_parent, &children, &nchildren) == 0)
    return 0;

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  if (!gdk_error_code)
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    {
      for (i = nchildren - 1; (i >= 0) && (child == None); i--)
	{
	  XWindowAttributes xwa;
	  
	  XGetWindowAttributes (gdk_display, children[i], &xwa);
	  
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	  if (gdk_error_code)
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	    gdk_error_code = 0;
	  else if ((xwa.map_state == IsViewable) && (xwa.class == InputOutput) &&
		   (x >= xwa.x) && (x < xwa.x + (gint)xwa.width) &&
		   (y >= xwa.y) && (y < xwa.y + (gint)xwa.height))
	    {
	      x -= xwa.x;
	      y -= xwa.y;
	      child = children[i];
	    }
	}
      
      XFree (children);
    }
  else
    gdk_error_code = 0;
#endif  
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  if (child)
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    return get_client_window_at_coords_recurse (child, x, y);
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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;

  gint old_warnings = gdk_error_warnings;
  
  gdk_error_code = 0;
  gdk_error_warnings = 0;

  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))
	    {
	      retval = get_client_window_at_coords_recurse (child->xid,
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							    x_root - child->x, 
							    y_root - child->y);
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	      if (!retval)
		retval = child->xid;
	    }
	  
	}
      tmp_list = tmp_list->next;
    }

  gdk_error_warnings = old_warnings;
  if (retval)
    return retval;
  else
    return gdk_root_window;
}

#if 0
static Window
get_client_window_at_coords_recurse (Window  win,
				     gint    x_root,
				     gint    y_root)
{
  Window child;
  Atom type = None;
  int format;
  unsigned long nitems, after;
  unsigned char *data;
  int dest_x, dest_y;
  
  static Atom wm_state_atom = None;

  if (!wm_state_atom)
    wm_state_atom = gdk_atom_intern ("WM_STATE", FALSE);
    
  XGetWindowProperty (gdk_display, win, 
		      wm_state_atom, 0, 0, False, AnyPropertyType,
		      &type, &format, &nitems, &after, &data);
  
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  if (gdk_error_code)
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    {
      gdk_error_code = 0;
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      return None;
    }

  if (type != None)
    {
      XFree (data);
      return win;
    }

  XTranslateCoordinates (gdk_display, gdk_root_window, win,
			 x_root, y_root, &dest_x, &dest_y, &child);

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  if (gdk_error_code)
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    {
      gdk_error_code = 0;
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      return None;
    }

  if (child)
    return get_client_window_at_coords_recurse (child, x_root, y_root);
  else
    return None;
}

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static Window 
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get_client_window_at_coords (Window  ignore,
			     gint    x_root,
			     gint    y_root)
{
  Window root, parent, *children;
  unsigned int nchildren;
  int i;
  Window retval = None;
  
  gint old_warnings = gdk_error_warnings;
  
  gdk_error_code = 0;
  gdk_error_warnings = 0;

  if (XQueryTree(gdk_display, gdk_root_window, 
		 &root, &parent, &children, &nchildren) == 0)
    return 0;
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  for (i = nchildren - 1; (i >= 0) && (retval == None); i--)
    {
      if (children[i] != ignore)
	{
	  XWindowAttributes xwa;

	  XGetWindowAttributes (gdk_display, children[i], &xwa);

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	  if (gdk_error_code)
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	    gdk_error_code = 0;
	  else if ((xwa.map_state == IsViewable) &&
		   (x_root >= xwa.x) && (x_root < xwa.x + (gint)xwa.width) &&
		   (y_root >= xwa.y) && (y_root < xwa.y + (gint)xwa.height))
	    {
	      retval = get_client_window_at_coords_recurse (children[i],
							    x_root, y_root);
	      if (!retval)
		retval = children[i];
	    }
	}
    }

  XFree (children);

  gdk_error_warnings = old_warnings;
  if (retval)
    return retval;
  else
    return gdk_root_window;
}
#endif

/*************************************************************
 ***************************** 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
};

/* Static data for MOTIF DND */
static GList **motif_target_lists = NULL;
static gint motif_n_target_lists = -1;

/* 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)
    {
      gchar *name = gdk_atom_name (GPOINTER_TO_INT (targets->data));
      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;

static Window motif_drag_window = None;
static GdkWindow *motif_drag_gdk_window = NULL;

static GdkAtom motif_drag_targets_atom = GDK_NONE;
static GdkAtom motif_drag_receiver_info_atom = GDK_NONE;

/* Target table handling */

GdkFilterReturn
motif_drag_window_filter (GdkXEvent *xevent,
			  GdkEvent  *event,
			  gpointer data)
{
  XEvent *xev = (XEvent *)xevent;

  switch (xev->xany.type)
    {
    case DestroyNotify:
      motif_drag_window = None;
      motif_drag_gdk_window = NULL;
      break;
    case PropertyNotify:
      if (motif_target_lists &&
	  motif_drag_targets_atom &&
	  (xev->xproperty.atom == motif_drag_targets_atom))
	motif_read_target_table();
      break;
    }
  return GDK_FILTER_REMOVE;
}

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

  XGetWindowProperty (gdk_display, gdk_root_window, motif_drag_window_atom,
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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;
      GDK_NOTE(DND, 
	       g_message ("Found drag window %#lx\n", motif_drag_window));
    }

  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.
 */
Window 
motif_find_drag_window (gboolean create)
{
  if (!motif_drag_window)
    {
      if (!motif_drag_window_atom)
	motif_drag_window_atom = gdk_atom_intern ("_MOTIF_DRAG_WINDOW", TRUE);

      motif_drag_window = motif_lookup_drag_window (gdk_display);
      
      if (!motif_drag_window && create)
	{
	  /* Create a persistant window. (Copied from LessTif) */
	  
	  Display *display;
	  XSetWindowAttributes attr;
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	  display = XOpenDisplay (gdk_display_name);
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	  XSetCloseDownMode (display, RetainPermanent);

	  XGrabServer (display);
	  
	  motif_drag_window = motif_lookup_drag_window (display);

	  if (!motif_drag_window)
	    {
	      attr.override_redirect = True;
	      attr.event_mask = PropertyChangeMask;
	      
	      motif_drag_window = 
		XCreateWindow(display, DefaultRootWindow(display),
			      -100, -100, 10, 10, 0, 0,
			      InputOnly, CopyFromParent,
			      (CWOverrideRedirect | CWEventMask), &attr);
	      
	      GDK_NOTE (DND,
			g_message ("Created drag window %#lx\n", motif_drag_window));
	      
	      XChangeProperty (display, gdk_root_window,
			       motif_drag_window_atom, XA_WINDOW,
			       32, PropModeReplace,
			       (guchar *)&motif_drag_window_atom, 1);

	    }
	  XUngrabServer (display);
	  XCloseDisplay (display);
	}

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

  return motif_drag_window;
}

static void 
motif_read_target_table (void)
{
  gulong bytes_after, nitems;
  GdkAtom type;
  gint format;
  gint i, j;

  if (!motif_drag_targets_atom)
    motif_drag_targets_atom = gdk_atom_intern ("_MOTIF_DRAG_TARGETS", FALSE);

  if (motif_target_lists)
    {
      for (i=0; i<motif_n_target_lists; i++)
	g_list_free (motif_target_lists[i]);
      
      g_free (motif_target_lists);
      motif_target_lists = NULL;
      motif_n_target_lists = 0;
    }

  if (motif_find_drag_window (FALSE))
    {
      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 (gdk_display, motif_drag_window, 
			  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 (gdk_display, motif_drag_window, motif_drag_targets_atom,
			  (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;

      motif_n_target_lists = header->n_lists;
      motif_target_lists = g_new0 (GList *, motif_n_target_lists);

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

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

      if (!success)
	{
	  if (motif_target_lists)
	    {
	      g_free (motif_target_lists);
	      motif_target_lists = NULL;
	      motif_n_target_lists = 0;
	    }
	  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 */
static gboolean
motif_target_table_check (GList *sorted)
{
  GList *tmp_list1, *tmp_list2;
  gint i;

  for (i=0; i<motif_n_target_lists; i++)
    {
      tmp_list1 = motif_target_lists[i];
      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
motif_add_to_target_table (GList *targets)
{
  GList *sorted = NULL;
  gint index = -1;
  gint i;
  GList *tmp_list;
  
  /* make a sorted copy of the list */
  
  while (targets)
    {
      sorted = g_list_insert_sorted (sorted, targets->data, targets_sort_func);
      targets = targets->next;
    }

  /* First check if it is their already */

  if (motif_target_lists)
    index = motif_target_table_check (sorted);

  /* 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. 
       */
      motif_find_drag_window (TRUE);

      XGrabServer(gdk_display);
      motif_read_target_table();
    
      /* Check again, in case it was added in the meantime */
      
      if (motif_target_lists)
	index =  motif_target_table_check (sorted);

      if (index < 0)
	{
	  guint32 total_size = 0;
	  guchar *data;
	  guchar *p;
	  guint16 *p16;
	  MotifTargetTableHeader *header;
	  
	  if (!motif_target_lists)
	    {
	      motif_target_lists = g_new (GList *, 1);
	      motif_n_target_lists = 1;
	    }
	  else
	    {
	      motif_n_target_lists++;
	      motif_target_lists = g_realloc (motif_target_lists,
					      sizeof(GList *) * motif_n_target_lists);
	    }
	  motif_target_lists[motif_n_target_lists - 1] = sorted;
	  sorted = NULL;
	  index = motif_n_target_lists - 1;

	  total_size = sizeof (MotifTargetTableHeader);
	  for (i = 0; i < motif_n_target_lists ; i++)
	    total_size += sizeof(guint16) + sizeof(guint32) * g_list_length (motif_target_lists[i]);

	  data = g_malloc (total_size);

	  header = (MotifTargetTableHeader *)data;
	  p = data + sizeof(MotifTargetTableHeader);

	  header->byte_order = local_byte_order;
	  header->protocol_version = 0;
	  header->n_lists = motif_n_target_lists;
	  header->total_size = total_size;

	  for (i = 0; i < motif_n_target_lists ; i++)
	    {
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	      guint16 n_targets = g_list_length (motif_target_lists[i]);
	      guint32 *targets = g_new (guint32, n_targets);
	      guint32 *p32 = targets;
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	      tmp_list = motif_target_lists[i];
	      while (tmp_list)
		{
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		  *p32 = GPOINTER_TO_UINT (tmp_list->data);
		  
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		  tmp_list = tmp_list->next;
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		  p32++;
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		}
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	      p16 = (guint16 *)p;
	      p += sizeof(guint16);

	      memcpy (p, targets, n_targets * sizeof(guint32));

	      *p16 = n_targets;
	      p += sizeof(guint32) * n_targets;
	      g_free (targets);
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	    }

	  XChangeProperty (gdk_display, motif_drag_window,
			   motif_drag_targets_atom,
			   motif_drag_targets_atom,
			   8, PropModeReplace,
			   data, total_size);
	}
      XUngrabServer(gdk_display);
    }

  g_list_free (sorted);
  return index;
}

/* Translate flags */

static void
motif_dnd_translate_flags (GdkDragContext *context, guint16 flags)
{
  guint recommended_op = flags & 0x000f;
  guint possible_ops = (flags & 0x0f0) >> 4;
  
  switch (recommended_op)
    {
    case XmDROP_MOVE:
      context->suggested_action = GDK_ACTION_MOVE;
      break;
    case XmDROP_COPY:
      context->suggested_action = GDK_ACTION_COPY;
      break;
    case XmDROP_LINK:
      context->suggested_action = GDK_ACTION_LINK;
      break;
    default:
      context->suggested_action = GDK_ACTION_COPY;
      break;
    }

  context->actions = 0;
  if (possible_ops & XmDROP_MOVE)
    context->actions |= GDK_ACTION_MOVE;
  if (possible_ops & XmDROP_COPY)
    context->actions |= GDK_ACTION_COPY;
  if (possible_ops & XmDROP_LINK)
    context->actions |= GDK_ACTION_LINK;
}

static guint16
motif_dnd_get_flags (GdkDragContext *context)
{
  guint16 flags = 0;
  
  switch (context->suggested_action)
    {
    case GDK_ACTION_MOVE:
      flags = XmDROP_MOVE;
      break;
    case GDK_ACTION_COPY:
      flags = XmDROP_COPY;
      break;
    case GDK_ACTION_LINK:
      flags = XmDROP_LINK;
      break;
    default:
      flags = XmDROP_NOOP;
      break;
    }
  
  if (context->actions & GDK_ACTION_MOVE)
    flags |= XmDROP_MOVE << 8;
  if (context->actions & GDK_ACTION_COPY)
    flags |= XmDROP_COPY << 8;
  if (context->actions & GDK_ACTION_LINK)
    flags |= XmDROP_LINK << 8;

  return flags;
}

/* Source Side */

static void
motif_set_targets (GdkDragContext *context)
{
  GdkDragContextPrivate *private = (GdkDragContextPrivate *)context;
  MotifDragInitiatorInfo info;
  gint i;
  static GdkAtom motif_drag_initiator_info = GDK_NONE;

  if (!motif_drag_initiator_info)
    motif_drag_initiator_info = gdk_atom_intern ("_MOTIF_DRAG_INITIATOR_INFO", FALSE);

  info.byte_order = local_byte_order;
  info.protocol_version = 0;
  
  info.targets_index = motif_add_to_target_table (context->targets);

  for (i=0; ; i++)
    {
      gchar buf[20];
      g_snprintf(buf, 20, "_GDK_SELECTION_%d", i);
      
      private->motif_selection = gdk_atom_intern (buf, FALSE);
      if (!XGetSelectionOwner (gdk_display, private->motif_selection))
	break;
    }

  info.selection_atom = private->motif_selection;

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  XChangeProperty (GDK_DRAWABLE_XDISPLAY (context->source_window),
		   GDK_DRAWABLE_XID (context->source_window),
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		   private->motif_selection,
		   motif_drag_initiator_info, 8, PropModeReplace,
		   (guchar *)&info, sizeof (info));

  private->motif_targets_set = 1;
}

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motif_check_dest (Window win)
{
  gboolean retval = FALSE;
  MotifDragReceiverInfo *info;
  Atom type = None;
  int format;
  unsigned long nitems, after;

  if (!motif_drag_receiver_info_atom)
    motif_drag_receiver_info_atom = gdk_atom_intern ("_MOTIF_DRAG_RECEIVER_INFO", FALSE);
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  gdk_error_trap_push ();
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  XGetWindowProperty (gdk_display, win, 
		      motif_drag_receiver_info_atom, 
		      0, (sizeof(*info)+3)/4, False, AnyPropertyType,
		      &type, &format, &nitems, &after, 
		      (guchar **)&info);
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  if (gdk_error_trap_pop() == 0)
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    {
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      if (type != None)
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	{
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	  if ((format == 8) && (nitems == sizeof(*info)))
	    {
	      if ((info->protocol_version == 0) &&
		  ((info->protocol_style == XmDRAG_PREFER_PREREGISTER) ||
		   (info->protocol_style == XmDRAG_PREFER_DYNAMIC) ||
		   (info->protocol_style == XmDRAG_DYNAMIC)))
		retval = TRUE;
	    }
	  else
	    {
	      GDK_NOTE (DND, 
			g_warning ("Invalid Motif drag receiver property on window %ld\n", win));
	    }
	  
	  XFree (info);
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	}
    }

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  return retval ? win : GDK_NONE;
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}

static void
motif_send_enter (GdkDragContext  *context,
		  guint32          time)
{
  XEvent xev;
  GdkDragContextPrivate *private = (GdkDragContextPrivate *)context;

  xev.xclient.type = ClientMessage;
  xev.xclient.message_type = gdk_atom_intern ("_MOTIF_DRAG_AND_DROP_MESSAGE", FALSE);
  xev.xclient.format = 8;
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  xev.xclient.window = GDK_DRAWABLE_XID (context->dest_window);
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  MOTIF_XCLIENT_BYTE (&xev, 0) = XmTOP_LEVEL_ENTER;
  MOTIF_XCLIENT_BYTE (&xev, 1) = local_byte_order;
  MOTIF_XCLIENT_SHORT (&xev, 1) = 0;
  MOTIF_XCLIENT_LONG (&xev, 1) = time;
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  MOTIF_XCLIENT_LONG (&xev, 2) = GDK_DRAWABLE_XID (context->source_window);
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  if (!private->motif_targets_set)
    motif_set_targets (context);

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  MOTIF_XCLIENT_LONG (&xev, 3) = private->motif_selection;
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  if (!gdk_send_xevent (GDK_DRAWABLE_XID (context->dest_window),
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			FALSE, 0, &xev))
    GDK_NOTE (DND, 
	      g_message ("Send event to %lx failed",
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			 GDK_DRAWABLE_XID (context->dest_window)));
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}

static void
motif_send_leave (GdkDragContext  *context,
		  guint32          time)
{
  XEvent xev;

  xev.xclient.type = ClientMessage;
  xev.xclient.message_type = gdk_atom_intern ("_MOTIF_DRAG_AND_DROP_MESSAGE", FALSE);
  xev.xclient.format = 8;
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  xev.xclient.window = GDK_DRAWABLE_XID (context->dest_window);
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  MOTIF_XCLIENT_BYTE (&xev, 0) = XmTOP_LEVEL_LEAVE;
  MOTIF_XCLIENT_BYTE (&xev, 1) = local_byte_order;
  MOTIF_XCLIENT_SHORT (&xev, 1) = 0;
  MOTIF_XCLIENT_LONG (&xev, 1) = time;
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  MOTIF_XCLIENT_LONG (&xev, 2) = GDK_DRAWABLE_XID (context->source_window);
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  MOTIF_XCLIENT_LONG (&xev, 3) = 0;
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  if (!gdk_send_xevent (GDK_DRAWABLE_XID (context->dest_window),
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			FALSE, 0, &xev))
    GDK_NOTE (DND, 
	      g_message ("Send event to %lx failed",
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			 GDK_DRAWABLE_XID (context->dest_window)));
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}

static gboolean
motif_send_motion (GdkDragContext  *context,
		    gint            x_root, 
		    gint            y_root,
		    GdkDragAction   action,
		    guint32         time)
{
  gboolean retval;
  XEvent xev;
  GdkDragContextPrivate *private = (GdkDragContextPrivate *)context;

  xev.xclient.type = ClientMessage;
  xev.xclient.message_type = gdk_atom_intern ("_MOTIF_DRAG_AND_DROP_MESSAGE", FALSE);
  xev.xclient.format = 8;
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  xev.xclient.window = GDK_DRAWABLE_XID (context->dest_window);
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  MOTIF_XCLIENT_BYTE (&xev, 1) = local_byte_order;
  MOTIF_XCLIENT_SHORT (&xev, 1) = motif_dnd_get_flags (context);
  MOTIF_XCLIENT_LONG (&xev, 1) = time;
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  if ((context->suggested_action != private->old_action) ||
      (context->actions != private->old_actions))
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    {
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      MOTIF_XCLIENT_BYTE (&xev, 0) = XmOPERATION_CHANGED;
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      /* private->drag_status = GDK_DRAG_STATUS_ACTION_WAIT; */
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      retval = TRUE;
    }
  else
    {
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      MOTIF_XCLIENT_BYTE (&xev, 0) = XmDRAG_MOTION;
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      MOTIF_XCLIENT_SHORT (&xev, 4) = x_root;
      MOTIF_XCLIENT_SHORT (&xev, 5) = y_root;
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      private->drag_status = GDK_DRAG_STATUS_MOTION_WAIT;
      retval = FALSE;
    }

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  if (!gdk_send_xevent (GDK_DRAWABLE_XID (context->dest_window),
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			FALSE, 0, &xev))
    GDK_NOTE (DND, 
	      g_message ("Send event to %lx failed",
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			 GDK_DRAWABLE_XID (context->dest_window)));
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  return retval;
}

static void
motif_send_drop (GdkDragContext *context, guint32 time)
{
  XEvent xev;
  GdkDragContextPrivate *private = (GdkDragContextPrivate *)context;

  xev.xclient.type = ClientMessage;
  xev.xclient.message_type = gdk_atom_intern ("_MOTIF_DRAG_AND_DROP_MESSAGE", FALSE);
  xev.xclient.format = 8;
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  xev.xclient.window = GDK_DRAWABLE_XID (context->dest_window);
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  MOTIF_XCLIENT_BYTE (&xev, 0) = XmDROP_START;
  MOTIF_XCLIENT_BYTE (&xev, 1) = local_byte_order;
  MOTIF_XCLIENT_SHORT (&xev, 1) = motif_dnd_get_flags (context);
  MOTIF_XCLIENT_LONG (&xev, 1)  = time;
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  MOTIF_XCLIENT_SHORT (&xev, 4) = private->last_x;
  MOTIF_XCLIENT_SHORT (&xev, 5) = private->last_y;
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  MOTIF_XCLIENT_LONG (&xev, 3)  = private->motif_selection;
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  MOTIF_XCLIENT_LONG (&xev, 4)  = GDK_DRAWABLE_XID (context->source_window);
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  if (!gdk_send_xevent (GDK_DRAWABLE_XID (context->dest_window),
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			FALSE, 0, &xev))
    GDK_NOTE (DND, 
	      g_message ("Send event to %lx failed",
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			 GDK_DRAWABLE_XID (context->dest_window)));
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}

/* Target Side */

static gboolean
motif_read_initiator_info (Window source_window, 
			   Atom atom,
			   GList  **targets,
			   GdkAtom *selection)
{
  GList *tmp_list;
  static GdkAtom motif_drag_initiator_info = GDK_NONE;
  GdkAtom type;
  gint format;
  gulong nitems;
  gulong bytes_after;

  MotifDragInitiatorInfo *initiator_info;

  if (!motif_drag_initiator_info)
    motif_drag_initiator_info = gdk_atom_intern ("_MOTIF_DRAG_INITIATOR_INFO", FALSE);

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  gdk_error_trap_push ();
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  XGetWindowProperty (gdk_display, source_window, atom,
		      0, sizeof(*initiator_info), FALSE,
		      motif_drag_initiator_info, 
		      &type, &format, &nitems, &bytes_after,
		      (guchar **)&initiator_info);

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  if (gdk_error_trap_pop () || (format != 8) || (nitems != sizeof (MotifDragInitiatorInfo)) || (bytes_after != 0))
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    {
      g_warning ("Error reading initiator info\n");
      return FALSE;
    }

  motif_read_target_table ();

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  initiator_info->targets_index = 
    card16_to_host (initiator_info->targets_index, initiator_info->byte_order);
  initiator_info->selection_atom = 
    card32_to_host (initiator_info->selection_atom, initiator_info->byte_order);
  
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