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nautilus-file-dnd.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */

/* nautilus-file-drag.c - Drag & drop handling code that operated on 
   NautilusFile objects.

   Copyright (C) 2000 Eazel, Inc.

   The Gnome 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.

   The Gnome 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 the Gnome Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.

   Authors: Pavel Cisler <pavel@eazel.com>,
*/

#include <config.h>
#include "nautilus-file-dnd.h"
#include "nautilus-desktop-icon-file.h"

#include "nautilus-dnd.h"
#include "nautilus-directory.h"
#include "nautilus-file-utilities.h"
#include <eel/eel-glib-extensions.h>
#include <string.h>

static gboolean
nautilus_drag_can_accept_files (NautilusFile *drop_target_item)
{
      NautilusDirectory *directory;

      if (nautilus_file_is_directory (drop_target_item)) {
            gboolean res;

            /* target is a directory, accept if editable */
            directory = nautilus_directory_get_for_file (drop_target_item);
            res = nautilus_directory_is_editable (directory);
            nautilus_directory_unref (directory);
            return res;
      }
      
      if (NAUTILUS_IS_DESKTOP_ICON_FILE (drop_target_item)) {
            return TRUE;
      }
      
      /* All Nautilus links are assumed to be links to directories.
       * Therefore, they all can accept drags, like all other
       * directories to. As with other directories, there can be
       * errors when the actual copy is attempted due to
       * permissions.
       */
      if (nautilus_file_is_nautilus_link (drop_target_item)) {
            return TRUE;
      }

      if (nautilus_is_file_roller_installed () &&
          nautilus_file_is_archive (drop_target_item)) {
            return TRUE;
      }
      
      return FALSE;
}

gboolean
nautilus_drag_can_accept_item (NautilusFile *drop_target_item,
                         const char *item_uri)
{
      if (nautilus_file_matches_uri (drop_target_item, item_uri)) {
            /* can't accept itself */
            return FALSE;
      }

      return nautilus_drag_can_accept_files (drop_target_item);
}
                               
gboolean
nautilus_drag_can_accept_items (NautilusFile *drop_target_item,
                        const GList *items)
{
      int max;

      if (drop_target_item == NULL)
            return FALSE;

      g_assert (NAUTILUS_IS_FILE (drop_target_item));

      /* Iterate through selection checking if item will get accepted by the
       * drop target. If more than 100 items selected, return an over-optimisic
       * result
       */
      for (max = 100; items != NULL && max >= 0; items = items->next, max--) {
            if (!nautilus_drag_can_accept_item (drop_target_item, 
                  ((NautilusDragSelectionItem *)items->data)->uri)) {
                  return FALSE;
            }
      }
      
      return TRUE;
}

gboolean
nautilus_drag_can_accept_info (NautilusFile *drop_target_item,
                         NautilusIconDndTargetType drag_type,
                         const GList *items)
{
      switch (drag_type) {
            case NAUTILUS_ICON_DND_GNOME_ICON_LIST:
                  return nautilus_drag_can_accept_items (drop_target_item, items);

            case NAUTILUS_ICON_DND_URI_LIST:
            case NAUTILUS_ICON_DND_NETSCAPE_URL:
            case NAUTILUS_ICON_DND_TEXT:
                  return nautilus_drag_can_accept_files (drop_target_item);

            case NAUTILUS_ICON_DND_XDNDDIRECTSAVE:
                  return nautilus_drag_can_accept_files (drop_target_item); /* Check if we can accept files at this location */

            case NAUTILUS_ICON_DND_KEYWORD:
                  return TRUE;

            case NAUTILUS_ICON_DND_ROOTWINDOW_DROP:
                  return FALSE;

            /* TODO return TRUE for folders as soon as drop handling is implemented */
            case NAUTILUS_ICON_DND_COLOR:
            case NAUTILUS_ICON_DND_BGIMAGE:
            case NAUTILUS_ICON_DND_RESET_BACKGROUND:
                  return FALSE;

            default:
                  g_assert_not_reached ();
                  return FALSE;
      }
}

void
nautilus_drag_file_receive_dropped_keyword (NautilusFile *file,
                                  const char *keyword)
{
      GList *keywords, *word;

      g_return_if_fail (NAUTILUS_IS_FILE (file));
      g_return_if_fail (keyword != NULL);

      /* special case the erase emblem */
      if (strcmp (keyword, NAUTILUS_FILE_DND_ERASE_KEYWORD) == 0) {
            keywords = NULL;
      } else {
            keywords = nautilus_file_get_keywords (file);
            word = g_list_find_custom (keywords, keyword, (GCompareFunc) strcmp);
            if (word == NULL) {
                  keywords = g_list_prepend (keywords, g_strdup (keyword));
            } else {
                  keywords = g_list_remove_link (keywords, word);
                  g_free (word->data);
                  g_list_free_1 (word);
            }
      }

      nautilus_file_set_keywords (file, keywords);
      eel_g_list_free_deep (keywords);
}

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