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