/* -*- 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/gtkdnd.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_TEXT_TYPE             "text/plain"
#define NAUTILUS_ICON_DND_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"

/* Item of the drag selection list */
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_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_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_GLOBAL_BACKGROUND = NAUTILUS_DND_ACTION_FIRST << 1
} NautilusDndAction;

/* drag&drop-related information. */
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;

	/* 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;

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);
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);
gboolean                    nautilus_drag_items_local                   (const char                           *target_uri,
									 const GList                          *selection_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);
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);

#endif