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