atk/atkstate.c

   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 Lesser 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  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser 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 #include "config.h"
  21
  22 #include "atk.h"
  23
  24 #include <string.h>
  25
  26 /**
  27  * SECTION:atkstate
  28  * @Short_description: An AtkState describes a single state of an object.
  29  * @Title:AtkState
  30  *
  31  * An AtkState describes a single state of an object. The full set of states
  32  * that apply to an object at a given time are contained in its #AtkStateSet.
  33  * See also #atk_object_ref_state_set and #atk_object_notify_state_change.
  34  */
  35
  36 static guint last_type = ATK_STATE_LAST_DEFINED;
  37
  38 #define NUM_POSSIBLE_STATES               (sizeof(AtkState)*8)
  39
  40 static gchar* state_names[NUM_POSSIBLE_STATES];
  41
  42 /**
  43  * atk_state_type_register:
  44  * @name: a character string describing the new state.
  45  *
  46  * Register a new object state.
  47  *
  48  * Returns: an #AtkState value for the new state.
  49  **/
  50 AtkStateType
  51 atk_state_type_register (const gchar *name)
  52 {
  53   g_return_val_if_fail (name, ATK_STATE_INVALID);
  54
  55   if (last_type < NUM_POSSIBLE_STATES -1)
  56     {
  57       state_names[++last_type] = g_strdup (name);
  58       return (last_type);
  59     }
  60   return ATK_STATE_INVALID; /* caller needs to check */
  61 }
  62
  63 /**
  64  * atk_state_type_get_name:
  65  * @type: The #AtkStateType whose name is required
  66  *
  67  * Gets the description string describing the #AtkStateType @type.
  68  *
  69  * Returns: the string describing the AtkStateType
  70  */
  71 const gchar*
  72 atk_state_type_get_name (AtkStateType type)
  73 {
  74   GTypeClass *type_class;
  75   GEnumValue *value;
  76   const gchar *name = NULL;
  77
  78   type_class = g_type_class_ref (ATK_TYPE_STATE_TYPE);
  79   g_return_val_if_fail (G_IS_ENUM_CLASS (type_class), NULL);
  80
  81   value = g_enum_get_value (G_ENUM_CLASS (type_class), type);
  82
  83   if (value)
  84     {
  85       name = value->value_nick;
  86     }
  87   else
  88     {
  89       if (type <= last_type)
  90         {
  91           if (type >= 0)
  92             name = state_names[type];
  93         }
  94     }
  95
  96   g_type_class_unref (type_class);
  97
  98   return name;
  99 }
 100
 101 /**
 102  * atk_state_type_for_name:
 103  * @name: a character string state name
 104  *
 105  * Gets the #AtkStateType corresponding to the description string @name.
 106  *
 107  * Returns: an #AtkStateType corresponding to @name
 108  */
 109 AtkStateType
 110 atk_state_type_for_name (const gchar *name)
 111 {
 112   GTypeClass *type_class;
 113   GEnumValue *value;
 114   AtkStateType type = ATK_STATE_INVALID;
 115
 116   g_return_val_if_fail (name, ATK_STATE_INVALID);
 117
 118   type_class = g_type_class_ref (ATK_TYPE_STATE_TYPE);
 119   g_return_val_if_fail (G_IS_ENUM_CLASS (type_class), ATK_STATE_INVALID);
 120
 121   value = g_enum_get_value_by_nick (G_ENUM_CLASS (type_class), name);
 122
 123   if (value)
 124     {
 125       type = value->value;
 126     }
 127   else
 128     {
 129       gint i;
 130
 131       for (i = ATK_STATE_LAST_DEFINED + 1; i <= last_type; i++)
 132         {
 133           if (state_names[i] == NULL)
 134             continue;
 135           if (!strcmp(name, state_names[i]))
 136             {
 137               type = i;
 138               break;
 139             }
 140         }
 141     }
 142   return type;
 143 }