gdkdnd-x11.c 110 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 "config.h"
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#include <X11/Xlib.h>
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#include <X11/Xutil.h>
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#include <X11/Xatom.h>
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#include <X11/extensions/shape.h>
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#include <X11/extensions/Xcomposite.h>
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#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;
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  gboolean shape_selected;
  gboolean shape_valid;
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  cairo_region_t *shape;
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} 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;
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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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  guint drop_failed : 1;        /* Whether the drop was unsuccessful */
  guint version;                /* Xdnd protocol version */
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  GSList *window_caches;
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  GdkDevice *device;
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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_finalize   (GObject              *object);
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static GList *contexts;

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static const struct {
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  const char *atom_name;
  GdkFilterFunc func;
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} xdnd_filters[] = {
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  { "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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G_DEFINE_TYPE (GdkDragContext, gdk_drag_context, G_TYPE_OBJECT)
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static void
gdk_drag_context_init (GdkDragContext *dragcontext)
{
  GdkDragContextPrivateX11 *private;
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  private = G_TYPE_INSTANCE_GET_PRIVATE (dragcontext, 
					 GDK_TYPE_DRAG_CONTEXT, 
					 GdkDragContextPrivateX11);
  
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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);

  object_class->finalize = gdk_drag_context_finalize;
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  g_type_class_add_private (object_class, sizeof (GdkDragContextPrivateX11));
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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_OBJECT_CLASS (gdk_drag_context_parent_class)->finalize (object);
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}
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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 *
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gdk_drag_context_new (void)
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{
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  return g_object_new (GDK_TYPE_DRAG_CONTEXT, NULL);
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}

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/**
 * gdk_drag_context_set_device:
 * @context: a #GdkDragContext
 * @device: a #GdkDevice
 *
 * Associates a #GdkDevice to @context, so all Drag and Drop events
 * for @context are emitted as if they came from this device.
 **/
void
gdk_drag_context_set_device (GdkDragContext *context,
                             GdkDevice      *device)
{
  GdkDragContextPrivateX11 *private;

  g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
  g_return_if_fail (GDK_IS_DEVICE (device));

  private = PRIVATE_DATA (context);

  if (private->device)
    {
      g_object_unref (private->device);
      private->device = NULL;
    }

  if (device)
    private->device = g_object_ref (device);
}

/**
 * gdk_drag_context_get_device:
 * @context: a #GdkDragContext
 *
 * Returns the #GdkDevice associated to the drag context.
 *
 * Returns: The #GdkDevice associated to @context.
 **/
GdkDevice *
gdk_drag_context_get_device (GdkDragContext *context)
{
  GdkDragContextPrivateX11 *private;

  g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), NULL);

  private = PRIVATE_DATA (context);

  return private->device;
}

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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;
}

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static void
precache_target_list (GdkDragContext *context)
{
  if (context->targets)
    {
      GPtrArray *targets = g_ptr_array_new ();
      GList *tmp_list;
      int i;

      for (tmp_list = context->targets; tmp_list; tmp_list = tmp_list->next)
	g_ptr_array_add (targets, gdk_atom_name (GDK_POINTER_TO_ATOM (tmp_list->data)));

      _gdk_x11_precache_atoms (GDK_WINDOW_DISPLAY (context->source_window),
			       (const gchar **)targets->pdata,
			       targets->len);

      for (i =0; i < targets->len; i++)
	g_free (targets->pdata[i]);

      g_ptr_array_free (targets, TRUE);
    }
}

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/* Utility functions */

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static void
free_cache_child (GdkCacheChild *child,
                  GdkDisplay    *display)
{
  if (child->shape)
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    cairo_region_destroy (child->shape);
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  if (child->shape_selected && display)
    {
      GdkDisplayX11 *display_x11 = GDK_DISPLAY_X11 (display);

      XShapeSelectInput (display_x11->xdisplay, child->xid, 0);
    }

  g_free (child);
}

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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;
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  child->shape_selected = FALSE;
  child->shape_valid = FALSE;
  child->shape = NULL;
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  cache->children = g_list_prepend (cache->children, child);
  g_hash_table_insert (cache->child_hash, GUINT_TO_POINTER (xid), 
		       cache->children);
}

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

  GdkDisplayX11 *display = GDK_DISPLAY_X11 (gdk_screen_get_display (cache->screen));

  if (display->have_shapes &&
      xevent->type == display->shape_event_base + ShapeNotify)
    {
      XShapeEvent *xse = (XShapeEvent*)xevent;
      GList *node;

      node = g_hash_table_lookup (cache->child_hash,
                                  GUINT_TO_POINTER (xse->window));
      if (node)
        {
          GdkCacheChild *child = node->data;
          child->shape_valid = FALSE;
          if (child->shape)
            {
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              cairo_region_destroy (child->shape);
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              child->shape = NULL;
            }
        }

      return GDK_FILTER_REMOVE;
    }

  return GDK_FILTER_CONTINUE;
}

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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) 
	  {
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	    GdkCacheChild *child = node->data;

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	    g_hash_table_remove (cache->child_hash,
				 GUINT_TO_POINTER (xdwe->window));
	    cache->children = g_list_remove_link (cache->children, node);
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	    /* window is destroyed, no need to disable ShapeNotify */
	    free_cache_child (child, NULL);
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	    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));
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	if (node)
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	  {
	    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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  Window cow;
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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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  if (G_UNLIKELY (!GDK_DISPLAY_X11 (GDK_SCREEN_X11 (screen)->display)->trusted_client)) 
    {
      GList *toplevel_windows, *list;
      GdkWindow *window;
      gint x, y, width, height;
      
      toplevel_windows = gdk_screen_get_toplevel_windows (screen);
      for (list = toplevel_windows; list; list = list->next) {
	window = GDK_WINDOW (list->data);
	gdk_window_get_geometry (window, &x, &y, &width, &height, NULL);
	gdk_window_cache_add (result, GDK_WINDOW_XID (window), 
			      x, y, width, height, 
			      gdk_window_is_visible (window));
      }
      g_list_free (toplevel_windows);
      return result;
    }

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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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  gdk_window_add_filter (NULL, gdk_window_cache_shape_filter, result);
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  if (!_gdk_x11_get_window_child_info (gdk_screen_get_display (screen),
				       GDK_WINDOW_XWINDOW (root_window),
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				       FALSE, NULL,
				       &children, &nchildren))
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    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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  /*
   * Add the composite overlay window to the cache, as this can be a reasonable
   * Xdnd proxy as well.
   * This is only done when the screen is composited in order to avoid mapping
   * the COW. We assume that the CM is using the COW (which is true for pretty
   * much any CM currently in use).
   */
  if (gdk_screen_is_composited (screen))
    {
      cow = XCompositeGetOverlayWindow (xdisplay, GDK_WINDOW_XWINDOW (root_window));
      gdk_window_cache_add (result, cow, 0, 0, gdk_screen_get_width (screen), gdk_screen_get_height (screen), TRUE);
      XCompositeReleaseOverlayWindow (xdisplay, GDK_WINDOW_XWINDOW (root_window));
    }

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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);
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  XSelectInput (GDK_WINDOW_XDISPLAY (root_window),
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		GDK_WINDOW_XWINDOW (root_window),
		cache->old_event_mask);
  gdk_window_remove_filter (root_window, gdk_window_cache_filter, cache);
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  gdk_window_remove_filter (NULL, gdk_window_cache_shape_filter, cache);
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  gdk_error_trap_push ();

  g_list_foreach (cache->children, (GFunc)free_cache_child,
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      gdk_screen_get_display (cache->screen));
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  gdk_flush ();
  gdk_error_trap_pop ();

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  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
is_pointer_within_shape (GdkDisplay    *display,
                         GdkCacheChild *child,
                         gint           x_pos,
                         gint           y_pos)
{
  if (!child->shape_selected)
    {
      GdkDisplayX11 *display_x11 = GDK_DISPLAY_X11 (display);

      XShapeSelectInput (display_x11->xdisplay, child->xid, ShapeNotifyMask);
      child->shape_selected = TRUE;
    }
  if (!child->shape_valid)
    {
      GdkDisplayX11 *display_x11 = GDK_DISPLAY_X11 (display);
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      cairo_region_t *input_shape;
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      child->shape = _xwindow_get_shape (display_x11->xdisplay,
                                         child->xid, ShapeBounding);
#ifdef ShapeInput
      input_shape = _xwindow_get_shape (display_x11->xdisplay,
                                        child->xid, ShapeInput);
      if (child->shape && input_shape)
        {
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          cairo_region_intersect (child->shape, input_shape);
          cairo_region_destroy (input_shape);
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        }
      else if (input_shape)
        {
          child->shape = input_shape;
        }
#endif

      child->shape_valid = TRUE;
    }

  return child->shape == NULL ||
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         cairo_region_contains_point (child->shape, x_pos, y_pos);
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}

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static Window
get_client_window_at_coords_recurse (GdkDisplay *display,
				     Window      win,
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				     gboolean    is_toplevel,
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				     gint        x,
				     gint        y)
{
  GdkChildInfoX11 *children;
  unsigned int nchildren;
  int i;
  gboolean found_child = FALSE;
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  GdkChildInfoX11 child = { 0, };
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  gboolean has_wm_state = FALSE;
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  if (!_gdk_x11_get_window_child_info (display, win, TRUE,
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				       is_toplevel? &has_wm_state : NULL,
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				       &children, &nchildren))
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    return None;
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  if (has_wm_state)
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    {
      g_free (children);

      return win;
    }
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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
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	return get_client_window_at_coords_recurse (display, child.window, FALSE, 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))
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        {
          if ((x_root >= child->x) && (x_root < child->x + child->width) &&
              (y_root >= child->y) && (y_root < child->y + child->height))
            {
              GdkDisplay *display = gdk_screen_get_display (cache->screen);

              if (!is_pointer_within_shape (display, child,
                                            x_root - child->x,
                                            y_root - child->y))
                {
                  tmp_list = tmp_list->next;
                  continue;
                }

              retval = get_client_window_at_coords_recurse (display,
                  child->xid, TRUE,
                  x_root - child->x,
                  y_root - child->y);
              if (!retval)
                retval = child->xid;
            }
        }
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      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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1002
	  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,
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			      InputOnly, (Visual *)CopyFromParent,
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			      (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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1055
  if (display_x11->motif_target_lists)
1056
    {
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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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    }

1065
  if (motif_find_drag_window (display, FALSE))
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    {
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      guchar *data;
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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,
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			  &data);
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      if (gdk_error_trap_pop () || (format != 8) || (nitems < sizeof (MotifTargetTableHeader)))
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	goto error;

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      header = (MotifTargetTableHeader *)data;

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      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;
    }

1214
  /* First check if it is there already */
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1216 1217
  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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1231 1232
      gdk_x11_display_grab (display);
      motif_read_target_table (display);
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      /* Check again, in case it was added in the meantime */
      
1236
      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;
	  
1247
	  if (!display_x11->motif_target_lists)
1248
	    {
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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);
1257
	    }
1258
	  display_x11->motif_target_lists[display_x11->motif_n_target_lists - 1] = sorted;
1259
	  sorted = NULL;
1260
	  index = display_x11->motif_n_target_lists - 1;
1261 1262

	  total_size = sizeof (MotifTargetTableHeader);
1263 1264
	  for (i = 0; i < display_x11->motif_n_target_lists ; i++)
	    total_size += sizeof(guint16) + sizeof(guint32) * g_list_length (display_x11->motif_target_lists[i]);
1265 1266 1267 1268 1269 1270 1271 1272

	  data = g_malloc (total_size);

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

	  header->byte_order = local_byte_order;
	  header->protocol_version = 0;
1273
	  header->n_lists = display_x11->motif_n_target_lists;
1274 1275
	  header->total_size = total_size;

1276
	  for (i = 0; i < display_x11->motif_n_target_lists ; i++)
1277
	    {
1278
	      guint16 n_targets = g_list_length (display_x11->motif_target_lists[i]);
1279 1280
	      guint32 *targets = g_new (guint32, n_targets);
	      guint32 *p32 = targets;
1281
	      
1282
	      tmp_list = display_x11->motif_target_lists[i];
1283 1284
	      while (tmp_list)
		{
1285 1286
		  *p32 = GPOINTER_TO_UINT (tmp_list->data);
		  
1287
		  tmp_list = tmp_list->next;
1288
		  p32++;
1289
		}
1290 1291 1292 1293 1294 1295 1296 1297 1298

	      p16 = (guint16 *)p;
	      p += sizeof(guint16);

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

	      *p16 = n_targets;
	      p += sizeof(guint32) * n_targets;
	      g_free (targets);
1299 1300
	    }

1301 1302 1303 1304
	  XChangeProperty (display_x11->xdisplay,
			   display_x11->motif_drag_window,
			   gdk_x11_get_xatom_by_name_for_display (display, "_MOTIF_DRAG_TARGETS"),
			   gdk_x11_get_xatom_by_name_for_display (display, "_MOTIF_DRAG_TARGETS"),
1305 1306 1307
			   8, PropModeReplace,
			   data, total_size);
	}
1308
      gdk_x11_display_ungrab (display);
1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383
    }

  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;
    }