atk/atkutil.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 "atkutil.h"
  21 #include "atkmarshal.c"
  22
  23
  24 static void atk_util_class_init (AtkUtilClass *klass);
  25
  26 GType
  27 atk_util_get_type (void)
  28 {
  29   static GType type = 0;
  30
  31   if (!type)
  32     {
  33       static const GTypeInfo typeInfo =
  34       {
  35         sizeof (AtkUtilClass),
  36         (GBaseInitFunc) NULL,
  37         (GBaseFinalizeFunc) NULL,
  38         (GClassInitFunc) atk_util_class_init,
  39         (GClassFinalizeFunc) NULL,
  40         NULL,
  41         sizeof (AtkUtil),
  42         0,
  43         (GInstanceInitFunc) NULL,
  44       } ;
  45       type = g_type_register_static (G_TYPE_OBJECT, "AtkUtil", &typeInfo, 0) ;
  46     }
  47   return type;
  48 }
  49
  50 static void
  51 atk_util_class_init (AtkUtilClass *klass)
  52 {
  53   klass->add_global_event_listener = NULL;
  54   klass->remove_global_event_listener = NULL;
  55   klass->get_root = NULL;
  56   klass->get_toolkit_name = NULL;
  57   klass->get_toolkit_version = NULL;
  58 }
  59
  60 /*
  61  * This file supports the addition and removal of multiple focus handlers
  62  * as long as they are all called in the same thread.
  63  */
  64 static AtkEventListenerInit  focus_tracker_init = (AtkEventListenerInit) NULL;
  65
  66 static gboolean init_done = FALSE;
  67
  68 /*
  69  * Array of FocusTracker structs
  70  */
  71 static GArray *trackers = NULL;
  72 static guint  index = 0;
  73
  74 typedef struct _FocusTracker FocusTracker;
  75
  76 struct _FocusTracker {
  77   guint index;
  78   AtkEventListener func;
  79 };
  80
  81 /**
  82  * atk_focus_tracker_init:
  83  * @add_function: Function to be called for focus tracker initialization
  84  *
  85  * Specifies the function to be called for focus tracker initialization.
  86  * This function should be called by an implementation of the
  87  * ATK interface if any specific work needs to be done to enable
  88  * focus tracking.
  89  **/
  90 void
  91 atk_focus_tracker_init (AtkEventListenerInit    init)
  92 {
  93   if (!focus_tracker_init)
  94     focus_tracker_init = init;
  95 }
  96
  97 /**
  98  * atk_add_focus_tracker:
  99  * @focus_tracker: Function to be added to the list of functions to be called
 100  * when an object receives focus.
 101  *
 102  * Adds the specified function to the list of functions to be called
 103  * when an object receives focus.
 104  *
 105  * Returns: added focus tracker id, or 0 on failure.
 106  **/
 107 guint
 108 atk_add_focus_tracker (AtkEventListener   focus_tracker)
 109 {
 110   g_return_val_if_fail (focus_tracker, 0);
 111
 112   if (!init_done)
 113   {
 114     if (focus_tracker_init)
 115     {
 116       focus_tracker_init ();
 117     }
 118     trackers = g_array_sized_new (FALSE, TRUE, sizeof (FocusTracker), 0);
 119     init_done = TRUE;
 120   }
 121   if (init_done)
 122   {
 123     FocusTracker item;
 124
 125     item.index = ++index;
 126     item.func = focus_tracker;
 127     trackers = g_array_append_val (trackers, item);
 128     return index;
 129   }
 130   else
 131   {
 132     return 0;
 133   }
 134 }
 135
 136 /**
 137  * atk_remove_focus_tracker:
 138  * @tracker_id: the id of the focus tracker to remove
 139  *
 140  * Removes the specified focus tracker from the list of functions
 141  * to be called when any object receives focus.
 142  **/
 143 void
 144 atk_remove_focus_tracker (guint            tracker_id)
 145 {
 146   FocusTracker *item;
 147   guint i;
 148
 149   if (trackers == NULL)
 150     return;
 151
 152   if (tracker_id == 0)
 153     return;
 154
 155   for (i = 0; i < trackers->len; i++)
 156   {
 157     item = &g_array_index (trackers, FocusTracker, i);
 158     if (item->index == tracker_id)
 159     {
 160       trackers = g_array_remove_index (trackers, i);
 161       break;
 162     }
 163   }
 164 }
 165
 166 /**
 167  * atk_focus_tracker_notify:
 168  * @object: an #AtkObject
 169  *
 170  * Cause the focus tracker functions which have been specified to be
 171  * executed for the object.
 172  **/
 173 void
 174 atk_focus_tracker_notify (AtkObject       *object)
 175 {
 176   FocusTracker *item;
 177   guint i;
 178
 179   if (trackers == NULL)
 180     return;
 181
 182   for (i = 0; i < trackers->len; i++)
 183   {
 184     item = &g_array_index (trackers, FocusTracker, i);
 185     g_return_if_fail (item != NULL);
 186     item->func (object);
 187   }
 188 }
 189
 190 /**
 191  * atk_add_global_event_listener:
 192  * @listener: the listener to notify
 193  * @event_type: the type of event for which notification is requested
 194  *
 195  * Adds the specified function to the list of functions to be called
 196  * when an event of type event_type occurs.
 197  *
 198  * Returns: added event listener id, or 0 on failure.
 199  **/
 200 guint
 201 atk_add_global_event_listener (GSignalEmissionHook listener, gchar* event_type)
 202 {
 203   guint retval;
 204   AtkUtilClass *klass = g_type_class_ref (ATK_TYPE_UTIL);
 205   if (klass->add_global_event_listener)
 206     {
 207       retval = klass->add_global_event_listener (listener, event_type);
 208     }
 209   else
 210     {
 211       retval = -1;
 212     }
 213   g_type_class_unref (klass);
 214
 215   return retval;
 216 }
 217
 218 /**
 219  * atk_remove_global_event_listener:
 220  * @listener_id: the id of the event listener to remove
 221  *
 222  * Removes the specified event listener
 223  **/
 224 void
 225 atk_remove_global_event_listener (guint listener_id)
 226 {
 227   AtkUtilClass *klass = g_type_class_peek (ATK_TYPE_UTIL);
 228
 229   if (klass->remove_global_event_listener)
 230     klass->remove_global_event_listener (listener_id);
 231 }
 232
 233 /**
 234  * atk_get_root:
 235  *
 236  * Gets the root accessible container for the current application.
 237  *
 238  * Returns: the root accessible container for the current application
 239  **/
 240 AtkObject*
 241 atk_get_root(void)
 242 {
 243   AtkUtilClass *klass = g_type_class_peek (ATK_TYPE_UTIL);
 244   if (klass->get_root)
 245     {
 246       return klass->get_root ();
 247     }
 248   else
 249     {
 250       return NULL;
 251     }
 252 }
 253
 254 /**
 255  * atk_get_toolkit_name:
 256  *
 257  * Gets name string for the GUI toolkit implementing ATK for this application.
 258  *
 259  * Returns: name string for the GUI toolkit implementing ATK for this application
 260  **/
 261 gchar* atk_get_toolkit_name(void)
 262 {
 263   AtkUtilClass *klass = g_type_class_peek (ATK_TYPE_UTIL);
 264   if (klass->get_toolkit_name)
 265     {
 266       return klass->get_toolkit_name ();
 267     }
 268   else
 269     {
 270       return NULL;
 271     }
 272 }
 273
 274 /**
 275  * atk_get_toolkit_version:
 276  *
 277  * Gets version string for the GUI toolkit implementing ATK for this application.
 278  *
 279  * Returns: version string for the GUI toolkit implementing ATK for this application
 280  **/
 281 gchar*
 282 atk_get_toolkit_version(void)
 283 {
 284   AtkUtilClass *klass = g_type_class_peek (ATK_TYPE_UTIL);
 285   if (klass->get_toolkit_version)
 286     {
 287       return klass->get_toolkit_version ();
 288     }
 289   else
 290     {
 291       return NULL;
 292     }
 293 }
 294