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/* Pango
* pango-direction.h: Unicode text direction
*
* Copyright (C) 2018 Matthias Clasen
*
* 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; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __PANGO_DIRECTION_H__
#define __PANGO_DIRECTION_H__
#include <glib.h>
G_BEGIN_DECLS
/**
* PangoDirection:
* @PANGO_DIRECTION_LTR: A strong left-to-right direction
* @PANGO_DIRECTION_RTL: A strong right-to-left direction
* @PANGO_DIRECTION_TTB_LTR: Deprecated value; treated the
* same as `PANGO_DIRECTION_RTL`.
* @PANGO_DIRECTION_TTB_RTL: Deprecated value; treated the
* same as `PANGO_DIRECTION_LTR`
* @PANGO_DIRECTION_WEAK_LTR: A weak left-to-right direction
* @PANGO_DIRECTION_WEAK_RTL: A weak right-to-left direction
* @PANGO_DIRECTION_NEUTRAL: No direction specified
*
* `PangoDirection` represents a direction in the Unicode bidirectional
* algorithm.
*
* Not every value in this enumeration makes sense for every usage of
* `PangoDirection`; for example, the return value of [func@unichar_direction]
* and [func@find_base_dir] cannot be `PANGO_DIRECTION_WEAK_LTR` or
* `PANGO_DIRECTION_WEAK_RTL`, since every character is either neutral
* or has a strong direction; on the other hand `PANGO_DIRECTION_NEUTRAL`
* doesn't make sense to pass to [func@itemize_with_base_dir].
*
* The `PANGO_DIRECTION_TTB_LTR`, `PANGO_DIRECTION_TTB_RTL` values come from
* an earlier interpretation of this enumeration as the writing direction
* of a block of text and are no longer used. See `PangoGravity` for how
* vertical text is handled in Pango.
*
* If you are interested in text direction, you should really use fribidi
* directly. `PangoDirection` is only retained because it is used in some
* public apis.
*/
typedef enum {
PANGO_DIRECTION_LTR,
PANGO_DIRECTION_RTL,
PANGO_DIRECTION_TTB_LTR,
PANGO_DIRECTION_TTB_RTL,
PANGO_DIRECTION_WEAK_LTR,
PANGO_DIRECTION_WEAK_RTL,
PANGO_DIRECTION_NEUTRAL
} PangoDirection;
G_END_DECLS
#endif /* __PANGO_DIRECTION_H__ */
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