/* GDK - The GIMP Drawing Kit
 * Copyright (C) 2010, Red Hat, Inc
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */

#ifndef __GDK_DND_PRIVATE_H__
#define __GDK_DND_PRIVATE_H__

#include "gdkdnd.h"

G_BEGIN_DECLS


/*
 * GdkDragProtocol:
 * @GDK_DRAG_PROTO_NONE: no protocol.
 * @GDK_DRAG_PROTO_MOTIF: The Motif DND protocol. No longer supported
 * @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_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.
 * @GDK_DRAG_PROTO_WAYLAND: Wayland DND protocol.
 *
 * Used in #GdkDragContext to indicate the protocol according to
 * which DND is done.
 */
typedef enum
{
  GDK_DRAG_PROTO_NONE = 0,
  GDK_DRAG_PROTO_MOTIF,
  GDK_DRAG_PROTO_XDND,
  GDK_DRAG_PROTO_ROOTWIN,
  GDK_DRAG_PROTO_WIN32_DROPFILES,
  GDK_DRAG_PROTO_OLE2,
  GDK_DRAG_PROTO_LOCAL,
  GDK_DRAG_PROTO_WAYLAND
} GdkDragProtocol;

#define GDK_DRAG_CONTEXT_CLASS(klass)      (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_DRAG_CONTEXT, GdkDragContextClass))
#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))

typedef struct _GdkDragContextClass GdkDragContextClass;


struct _GdkDragContextClass {
  GObjectClass parent_class;

  GdkWindow * (*find_window)   (GdkDragContext  *context,
                                GdkWindow       *drag_window,
                                gint             x_root,
                                gint             y_root,
                                GdkDragProtocol *protocol);
  GdkAtom     (*get_selection) (GdkDragContext  *context);
  gboolean    (*drag_motion)   (GdkDragContext  *context,
                                GdkWindow       *dest_window,
                                GdkDragProtocol  protocol,
                                gint             root_x,
                                gint             root_y,
                                GdkDragAction    suggested_action,
                                GdkDragAction    possible_actions,
                                guint32          time_);
  void        (*drag_status)   (GdkDragContext  *context,
                                GdkDragAction    action,
                                guint32          time_);
  void        (*drag_abort)    (GdkDragContext  *context,
                                guint32          time_);
  void        (*drag_drop)     (GdkDragContext  *context,
                                guint32          time_);
  void        (*drop_reply)    (GdkDragContext  *context,
                                gboolean         accept,
                                guint32          time_);
  void        (*drop_finish)   (GdkDragContext  *context,
                                gboolean         success,
                                guint32          time_);
  void                  (* read_async)                          (GdkDragContext         *context,
                                                                 GdkContentFormats      *formats,
                                                                 int                     io_priority,
                                                                 GCancellable           *cancellable,
                                                                 GAsyncReadyCallback     callback,
                                                                 gpointer                user_data);
  GInputStream *        (* read_finish)                         (GdkDragContext         *context,
                                                                 const char            **out_mime_type,
                                                                 GAsyncResult           *result,
                                                                 GError                **error);
  gboolean    (*drop_status)   (GdkDragContext  *context);
  GdkWindow*  (*get_drag_window) (GdkDragContext *context);
  void        (*set_hotspot)   (GdkDragContext  *context,
                                gint             hot_x,
                                gint             hot_y);
  void        (*drop_done)     (GdkDragContext   *context,
                                gboolean          success);

  void        (*set_cursor)     (GdkDragContext  *context,
                                 GdkCursor       *cursor);
  void        (*cancel)         (GdkDragContext      *context,
                                 GdkDragCancelReason  reason);
  void        (*drop_performed) (GdkDragContext  *context,
                                 guint32          time);
  void        (*dnd_finished)   (GdkDragContext  *context);

  gboolean    (*handle_event)   (GdkDragContext  *context,
                                 const GdkEvent  *event);
  void        (*action_changed) (GdkDragContext  *context,
                                 GdkDragAction    action);

  void        (*commit_drag_status) (GdkDragContext  *context);
};

struct _GdkDragContext {
  GObject parent_instance;

  /*< private >*/
  GdkDragProtocol protocol;

  GdkDisplay *display;

  gboolean is_source;
  GdkWindow *source_window;
  GdkWindow *dest_window;
  GdkWindow *drag_window;

  GdkContentProvider *content;
  GdkContentFormats *formats;
  GdkDragAction actions;
  GdkDragAction suggested_action;
  GdkDragAction action;

  guint32 start_time;

  GdkDevice *device;

  guint drop_done : 1; /* Whether gdk_drag_drop_done() was performed */
};

void     gdk_drag_context_set_device          (GdkDragContext *context,
                                               GdkDevice      *device);
void     gdk_drag_context_set_cursor          (GdkDragContext *context,
                                               GdkCursor      *cursor);
void     gdk_drag_context_cancel              (GdkDragContext      *context,
                                               GdkDragCancelReason  reason);
gboolean gdk_drag_context_handle_source_event (GdkEvent *event);
gboolean gdk_drag_context_handle_dest_event   (GdkEvent *event);
GdkCursor * gdk_drag_get_cursor               (GdkDragContext *context,
                                               GdkDragAction   action);

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_abort  (GdkDragContext *context,
                          guint32         time_);
void     gdk_drag_drop   (GdkDragContext *context,
                          guint32         time_);

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

void                    gdk_drag_context_write_async            (GdkDragContext         *context,
                                                                 const char             *mime_type,
                                                                 GOutputStream          *stream,
                                                                 int                     io_priority,
                                                                 GCancellable           *cancellable,
                                                                 GAsyncReadyCallback     callback,
                                                                 gpointer                user_data);
gboolean                gdk_drag_context_write_finish           (GdkDragContext         *context,
                                                                 GAsyncResult           *result,
                                                                 GError                **error);


G_END_DECLS

#endif