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/usr/include/mx-1.0/mx/mx-focusable.h is in libmx-dev 1.4.7-1+b1.

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/*
 * mx-focusable: An interface for actors than can accept keyboard focus
 *
 * Copyright 2010 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU Lesser General Public License,
 * version 2.1, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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 program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Written by: Thomas Wood <thomas.wood@intel.com>
 *
 */

#if !defined(MX_H_INSIDE) && !defined(MX_COMPILATION)
#error "Only <mx/mx.h> can be included directly.h"
#endif

#ifndef _MX_FOCUSABLE_H
#define _MX_FOCUSABLE_H

#include <glib-object.h>

G_BEGIN_DECLS

#define MX_TYPE_FOCUSABLE mx_focusable_get_type()

#define MX_FOCUSABLE(obj)    (G_TYPE_CHECK_INSTANCE_CAST ((obj), MX_TYPE_FOCUSABLE, MxFocusable))

#define MX_IS_FOCUSABLE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), MX_TYPE_FOCUSABLE))

#define MX_FOCUSABLE_GET_INTERFACE(inst) (G_TYPE_INSTANCE_GET_INTERFACE ((inst), MX_TYPE_FOCUSABLE, MxFocusableIface))


/**
 * MxFocusable:
 *
 * This is an opaque structure whose members cannot be directly accessed.
 */
typedef struct _MxFocusable      MxFocusable; /* dummy */
typedef struct _MxFocusableIface MxFocusableIface;

typedef enum
{
  MX_FOCUS_DIRECTION_OUT,
  MX_FOCUS_DIRECTION_UP,
  MX_FOCUS_DIRECTION_DOWN,
  MX_FOCUS_DIRECTION_LEFT,
  MX_FOCUS_DIRECTION_RIGHT,
  MX_FOCUS_DIRECTION_NEXT,
  MX_FOCUS_DIRECTION_PREVIOUS
} MxFocusDirection;

typedef enum
{
  MX_FOCUS_HINT_FIRST,
  MX_FOCUS_HINT_LAST,
  MX_FOCUS_HINT_PRIOR,
  MX_FOCUS_HINT_FROM_ABOVE,
  MX_FOCUS_HINT_FROM_BELOW,
  MX_FOCUS_HINT_FROM_LEFT,
  MX_FOCUS_HINT_FROM_RIGHT
} MxFocusHint;

struct _MxFocusableIface
{
  GObjectClass parent_class;

  MxFocusable* (*accept_focus) (MxFocusable *focusable,
                                MxFocusHint  hint);
  MxFocusable* (*move_focus)   (MxFocusable      *focusable,
                                MxFocusDirection  direction,
                                MxFocusable      *from);
};

GType mx_focusable_get_type (void) G_GNUC_CONST;

MxFocusable* mx_focusable_move_focus   (MxFocusable      *focusable,
                                        MxFocusDirection  direction,
                                        MxFocusable      *from);
MxFocusable* mx_focusable_accept_focus (MxFocusable *focusable,
                                        MxFocusHint  hint);

MxFocusHint mx_focus_hint_from_direction (MxFocusDirection direction);

G_END_DECLS

#endif /* _MX_FOCUSABLE_H */