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nautilus-dnd.h

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

/* nautilus-dnd.h - Common Drag & drop handling code shared by the icon container
   and the list view.

   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>,
          Ettore Perazzoli <ettore@gnu.org>
*/

#ifndef NAUTILUS_DND_H
#define NAUTILUS_DND_H

#include <gtk/gtk.h>
#include <libnautilus-private/nautilus-window-slot-info.h>

/* Drag & Drop target names. */
#define NAUTILUS_ICON_DND_GNOME_ICON_LIST_TYPE  "x-special/gnome-icon-list"
#define NAUTILUS_ICON_DND_URI_LIST_TYPE         "text/uri-list"
#define NAUTILUS_ICON_DND_NETSCAPE_URL_TYPE     "_NETSCAPE_URL"
#define NAUTILUS_ICON_DND_COLOR_TYPE            "application/x-color"
#define NAUTILUS_ICON_DND_BGIMAGE_TYPE          "property/bgimage"
#define NAUTILUS_ICON_DND_KEYWORD_TYPE          "property/keyword"
#define NAUTILUS_ICON_DND_RESET_BACKGROUND_TYPE "x-special/gnome-reset-background"
#define NAUTILUS_ICON_DND_ROOTWINDOW_DROP_TYPE  "application/x-rootwindow-drop"
#define NAUTILUS_ICON_DND_XDNDDIRECTSAVE_TYPE   "XdndDirectSave0" /* XDS Protocol Type */
#define NAUTILUS_ICON_DND_RAW_TYPE  "application/octet-stream"

/* Item of the drag selection list */
00046 typedef struct {
      char *uri;
      gboolean got_icon_position;
      int icon_x, icon_y;
      int icon_width, icon_height;
} NautilusDragSelectionItem;

/* Standard Drag & Drop types. */
typedef enum {
      NAUTILUS_ICON_DND_GNOME_ICON_LIST,
      NAUTILUS_ICON_DND_URI_LIST,
      NAUTILUS_ICON_DND_NETSCAPE_URL,
      NAUTILUS_ICON_DND_COLOR,
      NAUTILUS_ICON_DND_BGIMAGE,
      NAUTILUS_ICON_DND_KEYWORD,
      NAUTILUS_ICON_DND_TEXT,
      NAUTILUS_ICON_DND_RESET_BACKGROUND,
      NAUTILUS_ICON_DND_XDNDDIRECTSAVE,
      NAUTILUS_ICON_DND_RAW,
      NAUTILUS_ICON_DND_ROOTWINDOW_DROP
} NautilusIconDndTargetType;

typedef enum {
      NAUTILUS_DND_ACTION_FIRST = GDK_ACTION_ASK << 1,
      NAUTILUS_DND_ACTION_SET_AS_BACKGROUND = NAUTILUS_DND_ACTION_FIRST << 0,
      NAUTILUS_DND_ACTION_SET_AS_FOLDER_BACKGROUND = NAUTILUS_DND_ACTION_FIRST << 1,
      NAUTILUS_DND_ACTION_SET_AS_GLOBAL_BACKGROUND = NAUTILUS_DND_ACTION_FIRST << 2
} NautilusDndAction;

/* drag&drop-related information. */
00076 typedef struct {
      GtkTargetList *target_list;

      /* Stuff saved at "receive data" time needed later in the drag. */
      gboolean got_drop_data_type;
      NautilusIconDndTargetType data_type;
      GtkSelectionData *selection_data;
      char *direct_save_uri;

      /* Start of the drag, in window coordinates. */
      int start_x, start_y;

      /* List of NautilusDragSelectionItems, representing items being dragged, or NULL
       * if data about them has not been received from the source yet.
       */
      GList *selection_list;

      /* has the drop occured ? */
      gboolean drop_occured;

      /* whether or not need to clean up the previous dnd data */
      gboolean need_to_destroy;

      /* autoscrolling during dragging */
      int auto_scroll_timeout_id;
      gboolean waiting_to_autoscroll;
      gint64 start_auto_scroll_in;

} NautilusDragInfo;

00106 typedef struct {
      /* NB: the following elements are managed by us */
      gboolean have_data;
      gboolean have_valid_data;

      gboolean drop_occured;

      unsigned int info;
      union {
            GList *selection_list;
            GList *uri_list;
            char *netscape_url;
      } data;

      /* NB: the following elements are managed by the caller of
       *   nautilus_drag_slot_proxy_init() */

      /* a fixed location, or NULL to use slot's location */
      GFile *target_location;
      /* a fixed slot, or NULL to use the window's active slot */
      NautilusWindowSlotInfo *target_slot;
} NautilusDragSlotProxyInfo;

typedef void            (* NautilusDragEachSelectedItemDataGet)   (const char *url, 
                                                 int x, int y, int w, int h, 
                                                 gpointer data);
typedef void            (* NautilusDragEachSelectedItemIterator)  (NautilusDragEachSelectedItemDataGet iteratee, 
                                                 gpointer iterator_context, 
                                                 gpointer data);

void                  nautilus_drag_init                    (NautilusDragInfo             *drag_info,
                                                       const GtkTargetEntry               *drag_types,
                                                       int                           drag_type_count,
                                                       gboolean                      add_text_targets);
void                  nautilus_drag_finalize                (NautilusDragInfo             *drag_info);
NautilusDragSelectionItem  *nautilus_drag_selection_item_new            (void);
void                  nautilus_drag_destroy_selection_list  (GList                              *selection_list);
GList                *nautilus_drag_build_selection_list          (GtkSelectionData             *data);

char **                     nautilus_drag_uri_array_from_selection_list (const GList                        *selection_list);
GList *                     nautilus_drag_uri_list_from_selection_list  (const GList                        *selection_list);

char **                     nautilus_drag_uri_array_from_list           (const GList                        *uri_list);
GList *                     nautilus_drag_uri_list_from_array           (const char                  **uris);

gboolean              nautilus_drag_items_local             (const char                   *target_uri,
                                                       const GList                        *selection_list);
gboolean              nautilus_drag_uris_local              (const char                   *target_uri,
                                                       const GList                        *source_uri_list);
gboolean              nautilus_drag_items_in_trash          (const GList                        *selection_list);
gboolean              nautilus_drag_items_on_desktop        (const GList                        *selection_list);
void                  nautilus_drag_default_drop_action_for_icons (GdkDragContext                     *context,
                                                       const char                   *target_uri,
                                                       const GList                        *items,
                                                       int                          *action);
GdkDragAction               nautilus_drag_default_drop_action_for_netscape_url (GdkDragContext                   *context);
GdkDragAction               nautilus_drag_default_drop_action_for_uri_list     (GdkDragContext                   *context,
                                                            const char                   *target_uri_string);
gboolean              nautilus_drag_drag_data_get                 (GtkWidget                    *widget,
                                                       GdkDragContext                     *context,
                                                       GtkSelectionData             *selection_data,
                                                       guint                               info,
                                                       guint32                       time,
                                                       gpointer                      container_context,
                                                       NautilusDragEachSelectedItemIterator  each_selected_item_iterator);
int                   nautilus_drag_modifier_based_action         (int                           default_action,
                                                       int                           non_default_action);

GdkDragAction               nautilus_drag_drop_action_ask         (GtkWidget                    *widget,
                                                       GdkDragAction                       possible_actions);
GdkDragAction               nautilus_drag_drop_background_ask           (GtkWidget                    *widget,
                                                       GdkDragAction                       possible_actions);

gboolean              nautilus_drag_autoscroll_in_scroll_region   (GtkWidget                    *widget);
void                  nautilus_drag_autoscroll_calculate_delta    (GtkWidget                    *widget,
                                                       float                              *x_scroll_delta,
                                                       float                              *y_scroll_delta);
void                  nautilus_drag_autoscroll_start        (NautilusDragInfo             *drag_info,
                                                       GtkWidget                    *widget,
                                                       GtkFunction                         callback,
                                                       gpointer                      user_data);
void                  nautilus_drag_autoscroll_stop         (NautilusDragInfo             *drag_info);

gboolean              nautilus_drag_selection_includes_special_link (GList                      *selection_list);

void                        nautilus_drag_slot_proxy_init               (GtkWidget *widget,
                                                       NautilusDragSlotProxyInfo *drag_info);

#endif

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