/* GDK - The GIMP Drawing Kit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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.
 */

/*
 * Modified by the GTK+ Team and others 1997-2000.  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/.
 */

#if !defined (__GDK_H_INSIDE__) && !defined (GDK_COMPILATION)
#error "Only <gdk/gdk.h> can be included directly."
#endif

#ifndef __GDK_DND_H__
#define __GDK_DND_H__

#include <gdk/gdktypes.h>
#include <gdk/gdkdevice.h>

G_BEGIN_DECLS

typedef struct _GdkDragContext        GdkDragContext;

/**
 * GdkDragAction:
 * @GDK_ACTION_DEFAULT: Means nothing, and should not be used.
 * @GDK_ACTION_COPY: Copy the data.
 * @GDK_ACTION_MOVE: Move the data, i.e. first copy it, then delete
 *  it from the source using the DELETE target of the X selection protocol.
 * @GDK_ACTION_LINK: Add a link to the data. Note that this is only
 *  useful if source and destination agree on what it means.
 * @GDK_ACTION_PRIVATE: Special action which tells the source that the
 *  destination will do something that the source doesn't understand.
 * @GDK_ACTION_ASK: Ask the user what to do with the data.
 *
 * Used in #GdkDragContext to indicate what the destination
 * should do with the dropped data.
 */
typedef enum
{
  GDK_ACTION_DEFAULT = 1 << 0,
  GDK_ACTION_COPY    = 1 << 1,
  GDK_ACTION_MOVE    = 1 << 2,
  GDK_ACTION_LINK    = 1 << 3,
  GDK_ACTION_PRIVATE = 1 << 4,
  GDK_ACTION_ASK     = 1 << 5
} GdkDragAction;

/**
 * GdkDragProtocol:
 * @GDK_DRAG_PROTO_MOTIF: The Motif DND protocol.
 * @GDK_DRAG_PROTO_XDND: The Xdnd protocol.
 * @GDK_DRAG_PROTO_ROOTWIN: An extension to the Xdnd protocol for
 *  unclaimed root window drops.
 * @GDK_DRAG_PROTO_NONE: no protocol.
 * @GDK_DRAG_PROTO_WIN32_DROPFILES: The simple WM_DROPFILES protocol.
 * @GDK_DRAG_PROTO_OLE2: The complex OLE2 DND protocol (not implemented).
 * @GDK_DRAG_PROTO_LOCAL: Intra-application DND.
 *
 * Used in #GdkDragContext to indicate the protocol according to
 * which DND is done.
 */
typedef enum
{
  GDK_DRAG_PROTO_MOTIF,
  GDK_DRAG_PROTO_XDND,
  GDK_DRAG_PROTO_ROOTWIN,	  /* A root window with nobody claiming
				   * drags */
  GDK_DRAG_PROTO_NONE,		  /* Not a valid drag window */
  GDK_DRAG_PROTO_WIN32_DROPFILES, /* The simple WM_DROPFILES dnd */
  GDK_DRAG_PROTO_OLE2,		  /* The complex OLE2 dnd (not implemented) */
  GDK_DRAG_PROTO_LOCAL            /* Intra-app */
} GdkDragProtocol;

/* Object that holds information about a drag in progress.
 * this is used on both source and destination sides.
 */

typedef struct _GdkDragContextClass GdkDragContextClass;

#define GDK_TYPE_DRAG_CONTEXT              (gdk_drag_context_get_type ())
#define GDK_DRAG_CONTEXT(object)           (G_TYPE_CHECK_INSTANCE_CAST ((object), GDK_TYPE_DRAG_CONTEXT, GdkDragContext))
#define GDK_DRAG_CONTEXT_CLASS(klass)      (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_DRAG_CONTEXT, GdkDragContextClass))
#define GDK_IS_DRAG_CONTEXT(object)        (G_TYPE_CHECK_INSTANCE_TYPE ((object), GDK_TYPE_DRAG_CONTEXT))
#define GDK_IS_DRAG_CONTEXT_CLASS(klass)   (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_DRAG_CONTEXT))
#define GDK_DRAG_CONTEXT_GET_CLASS(obj)    (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_DRAG_CONTEXT, GdkDragContextClass))

struct _GdkDragContext {
  GObject parent_instance;

  /*< public >*/
  
  GdkDragProtocol GSEAL (protocol);

  gboolean GSEAL (is_source);
  
  GdkWindow *GSEAL (source_window);
  GdkWindow *GSEAL (dest_window);

  GList *GSEAL (targets);
  GdkDragAction GSEAL (actions);
  GdkDragAction GSEAL (suggested_action);
  GdkDragAction GSEAL (action);

  guint32 GSEAL (start_time);

  /*< private >*/
  
  gpointer GSEAL (windowing_data);
};

struct _GdkDragContextClass {
  GObjectClass parent_class;

};

/* Drag and Drop */

GType            gdk_drag_context_get_type   (void) G_GNUC_CONST;
GdkDragContext * gdk_drag_context_new        (void);

void             gdk_drag_context_set_device           (GdkDragContext *context,
                                                        GdkDevice      *device);
GdkDevice *      gdk_drag_context_get_device           (GdkDragContext *context);

GList           *gdk_drag_context_list_targets         (GdkDragContext *context);
GdkDragAction    gdk_drag_context_get_actions          (GdkDragContext *context);
GdkDragAction    gdk_drag_context_get_suggested_action (GdkDragContext *context);
GdkDragAction    gdk_drag_context_get_selected_action  (GdkDragContext *context);

GdkWindow       *gdk_drag_context_get_source_window    (GdkDragContext *context);
GdkWindow       *gdk_drag_context_get_dest_window      (GdkDragContext *context);
GdkDragProtocol  gdk_drag_context_get_protocol         (GdkDragContext *context);

/* Destination side */

void             gdk_drag_status        (GdkDragContext   *context,
				         GdkDragAction     action,
					 guint32           time_);
void             gdk_drop_reply         (GdkDragContext   *context,
					 gboolean          ok,
					 guint32           time_);
void             gdk_drop_finish        (GdkDragContext   *context,
					 gboolean          success,
					 guint32           time_);
GdkAtom          gdk_drag_get_selection (GdkDragContext   *context);

/* Source side */

GdkDragContext * gdk_drag_begin      (GdkWindow      *window,
				      GList          *targets);

GdkNativeWindow gdk_drag_get_protocol_for_display (GdkDisplay       *display,
						   GdkNativeWindow   xid,
						   GdkDragProtocol  *protocol);

void    gdk_drag_find_window_for_screen   (GdkDragContext   *context,
					   GdkWindow        *drag_window,
					   GdkScreen        *screen,
					   gint              x_root,
					   gint              y_root,
					   GdkWindow       **dest_window,
					   GdkDragProtocol  *protocol);

#ifndef GDK_MULTIHEAD_SAFE
GdkNativeWindow gdk_drag_get_protocol (GdkNativeWindow   xid,
				       GdkDragProtocol  *protocol);

void    gdk_drag_find_window  (GdkDragContext   *context,
			       GdkWindow        *drag_window,
			       gint              x_root,
			       gint              y_root,
			       GdkWindow       **dest_window,
			       GdkDragProtocol  *protocol);
#endif /* GDK_MULTIHEAD_SAFE */

gboolean        gdk_drag_motion      (GdkDragContext *context,
				      GdkWindow      *dest_window,
				      GdkDragProtocol protocol,
				      gint            x_root, 
				      gint            y_root,
				      GdkDragAction   suggested_action,
				      GdkDragAction   possible_actions,
				      guint32         time_);
void            gdk_drag_drop        (GdkDragContext *context,
				      guint32         time_);
void            gdk_drag_abort       (GdkDragContext *context,
				      guint32         time_);
gboolean        gdk_drag_drop_succeeded (GdkDragContext *context);

G_END_DECLS

#endif /* __GDK_DND_H__ */