atk/atkaction.h

   1 /* ATK -  Accessibility Toolkit
   2  * Copyright 2001 Sun Microsystems Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 #ifndef __ATK_ACTION_H__
  21 #define __ATK_ACTION_H__
  22
  23 #include <atk/atkobject.h>
  24
  25 #ifdef __cplusplus
  26 extern "C" {
  27 #endif /* __cplusplus */
  28
  29 /*
  30  * The interface AtkAction should be supported by any object that can
  31  * perform one or more actions. The interface provides the standard
  32  * mechanism for an assitive technology to determine what those actions
  33  * are as well as tell the object to perform them. Any object that can
  34  * be manipulated should support this interface.
  35  */
  36
  37
  38 #define ATK_TYPE_ACTION                    (atk_action_get_type ())
  39 #define ATK_IS_ACTION(obj)                 G_TYPE_CHECK_INSTANCE_TYPE ((obj), ATK_TYPE_ACTION)
  40 #define ATK_ACTION(obj)                    G_TYPE_CHECK_INSTANCE_CAST ((obj), ATK_TYPE_ACTION, AtkAction)
  41 #define ATK_ACTION_GET_IFACE(obj)          (G_TYPE_INSTANCE_GET_INTERFACE ((obj), ATK_TYPE_ACTION, AtkActionIface))
  42
  43 #ifndef _TYPEDEF_ATK_ACTION_
  44 #define _TYPEDEF_ATK_ACTION_
  45 typedef struct _AtkAction AtkAction;
  46 #endif
  47 typedef struct _AtkActionIface AtkActionIface;
  48
  49 struct _AtkActionIface
  50 {
  51   GTypeInterface parent;
  52
  53   /*
  54    * Perform the specified action on the object
  55    */
  56   gboolean (*do_action)         (AtkAction         *action,
  57                                  gint              i);
  58   /*
  59    * Returns the number of accessible actions available on the object.
  60    * If there are more than one, the first one is considered the
  61    * "default" action of the object.
  62    */
  63   gint     (*get_n_actions)     (AtkAction         *action);
  64   /*
  65    * Returns a description of the specified action of the object
  66    */
  67   G_CONST_RETURN gchar*   (*get_description)   (AtkAction         *action,
  68                                                 gint              i);
  69   /*
  70    * Returns a keybinding associated with this action, if one exists.
  71    */
  72   G_CONST_RETURN gchar*   (*get_keybinding)    (AtkAction         *action,
  73                                                 gint              i);
  74
  75 };
  76 GType atk_action_get_type ();
  77
  78 /*
  79  * These are the function which would be called by an application with
  80  * the argument being a AtkObject object cast to (AtkAction).
  81  *
  82  * The function will just check that * the corresponding
  83  * function pointer is not NULL and will call it.
  84  *
  85  * The "real" implementation of the function for accessible will be
  86  * provided in a support library
  87  */
  88
  89 void   atk_action_do_action                (AtkAction         *action,
  90                                             gint              i);
  91 gint   atk_action_get_n_actions            (AtkAction *action);
  92 G_CONST_RETURN gchar* atk_action_get_description  (AtkAction         *action,
  93                                                    gint              i);
  94 G_CONST_RETURN gchar* atk_action_get_keybinding   (AtkAction         *action,
  95                                                    gint              i);
  96
  97
  98 /*
  99  * Additional GObject properties exported by AtkAction:
 100  *    "accessible_action"
 101  *       (an accessible action, or the list of actions, has changed)
 102  */
 103
 104 #ifdef __cplusplus
 105 }
 106 #endif /* __cplusplus */
 107
 108
 109 #endif /* __ATK_ACTION_H__ */