/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* This file is part of the GtkHTML library.

   Copyright 1999, 2000 Helix Code, Inc.

   This 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.

   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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this 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.

   Author: Ettore Perazzoli <ettore@helixcode.com>
*/

#ifndef HTMLCURSOR_H
#define HTMLCURSOR_H

#include "htmltypes.h"

struct _HTMLCursor {
	HTMLObject *object;
	guint offset;

	gint target_x;
	guint have_target_x : 1;

	gint position;
};

struct _HTMLCursorRectagle {
	HTMLObject *object;
	gint x1;
	gint y1;
	gint x2;
	gint y2;
};

/* Lifecycle.  */
HTMLCursor *html_cursor_new      (void);
void        html_cursor_init     (HTMLCursor       *cursor,
				  HTMLObject       *o,
				  guint             offset);
void        html_cursor_destroy  (HTMLCursor       *cursor);
HTMLCursor *html_cursor_dup      (const HTMLCursor *cursor);
void        html_cursor_copy     (HTMLCursor       *dest,
				  const HTMLCursor *src);
/* Basic movement.   */
void        html_cursor_home                    (HTMLCursor *cursor,
						 HTMLEngine *engine);
gboolean    html_cursor_forward                 (HTMLCursor *cursor,
						 HTMLEngine *engine);
gboolean    html_cursor_backward                (HTMLCursor *cursor,
						 HTMLEngine *engine);
gboolean    html_cursor_forward_n               (HTMLCursor *cursor,
						 HTMLEngine *e,
						 guint       n);
gboolean    html_cursor_backward_n              (HTMLCursor *cursor,
						 HTMLEngine *e,
						 guint       n);
gboolean    html_cursor_up                      (HTMLCursor *cursor,
						 HTMLEngine *engine);
gboolean    html_cursor_down                    (HTMLCursor *cursor,
						 HTMLEngine *engine);
gboolean    html_cursor_left                    (HTMLCursor *cursor,
						 HTMLEngine *engine);
gboolean    html_cursor_right                   (HTMLCursor *cursor,
						 HTMLEngine *engine);
void        html_cursor_beginning_of_document   (HTMLCursor *cursor,
						 HTMLEngine *engine);
void        html_cursor_end_of_document         (HTMLCursor *cursor,
						 HTMLEngine *engine);
gboolean    html_cursor_beginning_of_line       (HTMLCursor *cursor,
						 HTMLEngine *engine);
gboolean    html_cursor_end_of_line             (HTMLCursor *cursor,
						 HTMLEngine *engine);
gboolean    html_cursor_beginning_of_paragraph  (HTMLCursor *cursor,
						 HTMLEngine *engine);
gboolean    html_cursor_end_of_paragraph        (HTMLCursor *cursor,
						 HTMLEngine *engine);
gboolean    html_cursor_jump_to                 (HTMLCursor *cursor,
						 HTMLEngine *engine,
						 HTMLObject *obj,
						 guint       offset);
HTMLObject *html_cursor_child_of                (HTMLCursor *cursor,
						 HTMLObject *parent);

/* Internals.  */
void  html_cursor_normalize     (HTMLCursor *cursor);

/* Position handling.  */
gint  html_cursor_get_position               (HTMLCursor *cursor);
void  html_cursor_jump_to_position           (HTMLCursor *cursor,
					      HTMLEngine *engine,
					      gint        position);
void  html_cursor_jump_to_position_no_spell  (HTMLCursor *cursor,
					      HTMLEngine *engine,
					      gint        position);

/* Retrieving the character under/before the cursor.  */
gunichar  html_cursor_get_current_char  (const HTMLCursor *cursor);
gunichar  html_cursor_get_prev_char     (const HTMLCursor *cursor);

/* Comparison.  */
gboolean  html_cursor_equal     (const HTMLCursor *a,
				 const HTMLCursor *b);
gboolean  html_cursor_precedes  (const HTMLCursor *a,
				 const HTMLCursor *b);
gboolean  html_cursor_follows   (const HTMLCursor *a,
				 const HTMLCursor *b);

#endif
