atk/atkstateset.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 <glib-object.h>
  21
  22 #include "atkobject.h"
  23 #include "atkstateset.h"
  24
  25 #define ATK_STATE(state_enum)             ((AtkState)(1 << ((guint64)(state_enum)%64)))
  26
  27 struct _AtkRealStateSet
  28 {
  29   GObject parent;
  30
  31   AtkState state;
  32 };
  33
  34 typedef struct _AtkRealStateSet      AtkRealStateSet;
  35
  36 static void            atk_state_set_class_init       (AtkStateSetClass  *klass);
  37
  38 GType
  39 atk_state_set_get_type (void)
  40 {
  41   static GType type = 0;
  42
  43   if (!type)
  44     {
  45       static const GTypeInfo typeInfo =
  46       {
  47         sizeof (AtkStateSetClass),
  48         (GBaseInitFunc) NULL,
  49         (GBaseFinalizeFunc) NULL,
  50         (GClassInitFunc) atk_state_set_class_init,
  51         (GClassFinalizeFunc) NULL,
  52         NULL,
  53         sizeof (AtkRealStateSet),
  54         0,
  55         (GInstanceInitFunc) NULL,
  56       } ;
  57       type = g_type_register_static (G_TYPE_OBJECT, "AtkStateSet", &typeInfo, 0) ;
  58     }
  59   return type;
  60 }
  61
  62 static void
  63 atk_state_set_class_init (AtkStateSetClass *klass)
  64 {
  65 }
  66
  67 /**
  68  * atk_state_set_new:
  69  *
  70  * Creates a new empty state set.
  71  *
  72  * Returns: a new #AtkStateSet
  73  **/
  74 AtkStateSet*
  75 atk_state_set_new (void)
  76 {
  77   return (AtkStateSet*) g_object_new (ATK_TYPE_STATE_SET, NULL);
  78 }
  79
  80 /**
  81  * atk_state_set_is_empty:
  82  * @set: an #AtkStateType
  83  *
  84  * Checks whether the state set is empty, i.e. has no states set.
  85  *
  86  * Returns: %TRUE if @set has no states set, otherwise %FALSE
  87  **/
  88 gboolean
  89 atk_state_set_is_empty (AtkStateSet   *set)
  90 {
  91   AtkRealStateSet *real_set;
  92   g_return_val_if_fail (ATK_IS_STATE_SET (set), FALSE);
  93
  94   real_set = (AtkRealStateSet *)set;
  95
  96   if (real_set->state)
  97     return FALSE;
  98   else
  99     return TRUE;
 100 }
 101
 102 /**
 103  * atk_state_set_add_state:
 104  * @set: an #AtkStateSet
 105  * @type: an #AtkStateType
 106  *
 107  * Add a new state for the specified type to the current state set if
 108  * it is not already present.
 109  *
 110  * Returns: %TRUE if  the state for @type is not already in @set.
 111  **/
 112 gboolean
 113 atk_state_set_add_state (AtkStateSet   *set,
 114                          AtkStateType  type)
 115 {
 116   AtkRealStateSet *real_set;
 117   g_return_val_if_fail (ATK_IS_STATE_SET (set), FALSE);
 118
 119   real_set = (AtkRealStateSet *)set;
 120
 121   if (real_set->state & ATK_STATE (type))
 122     return FALSE;
 123   else
 124   {
 125     real_set->state |= ATK_STATE (type);
 126     return TRUE;
 127   }
 128 }
 129 /**
 130  * atk_state_set_add_states:
 131  * @set: an #AtkStateSet
 132  * @types: an array of #AtkStateType
 133  * @n_types: The number of elements in the array
 134  *
 135  * Add the states for the specified types to the current state set.
 136  **/
 137 void
 138 atk_state_set_add_states (AtkStateSet   *set,
 139                           AtkStateType  *types,
 140                           gint          n_types)
 141 {
 142   AtkRealStateSet *real_set;
 143   gint     i;
 144   g_return_if_fail (ATK_IS_STATE_SET (set));
 145
 146   real_set = (AtkRealStateSet *)set;
 147
 148   for (i = 0; i < n_types; i++)
 149   {
 150     real_set->state |= ATK_STATE (types[i]);
 151   }
 152 }
 153
 154 /**
 155  * atk_state_set_clear_states:
 156  * @set: an #AtkStateSet
 157  *
 158  * Removes all states from the state set.
 159  **/
 160 void
 161 atk_state_set_clear_states (AtkStateSet   *set)
 162 {
 163   AtkRealStateSet *real_set;
 164   g_return_if_fail (ATK_IS_STATE_SET (set));
 165
 166   real_set = (AtkRealStateSet *)set;
 167
 168   real_set->state = 0;
 169 }
 170
 171 /**
 172  * atk_state_set_contains_state:
 173  * @set: an #AtkStateSet
 174  * @type: an #AtkStateType
 175  *
 176  * Checks whether the state for the specified type is in the specified set.
 177  *
 178  * Returns: %TRUE if @type is the state type is in @set.
 179  **/
 180 gboolean
 181 atk_state_set_contains_state (AtkStateSet   *set,
 182                               AtkStateType  type)
 183 {
 184   AtkRealStateSet *real_set;
 185   g_return_val_if_fail (ATK_IS_STATE_SET (set), FALSE);
 186
 187   real_set = (AtkRealStateSet *)set;
 188
 189   if (real_set->state & ATK_STATE (type))
 190     return TRUE;
 191   else
 192     return FALSE;
 193 }
 194
 195 /**
 196  * atk_state_set_contains_states:
 197  * @set: an #AtkStateSet
 198  * @types: an array of #AtkStateType
 199  * @n_types: The number of elements in the array
 200  *
 201  * Checks whether the states for all the specified types are in the
 202  * specified set.
 203  *
 204  * Returns: %TRUE if all the states for @type are in @set.
 205  **/
 206 gboolean
 207 atk_state_set_contains_states (AtkStateSet   *set,
 208                                AtkStateType  *types,
 209                                gint          n_types)
 210 {
 211   AtkRealStateSet *real_set;
 212   gint i;
 213   g_return_val_if_fail (ATK_IS_STATE_SET (set), FALSE);
 214
 215   real_set = (AtkRealStateSet *)set;
 216
 217   for (i = 0; i < n_types; i++)
 218   {
 219     if (!(real_set->state & ATK_STATE (types[i])))
 220       return FALSE;
 221   }
 222   return TRUE;
 223 }
 224
 225 /**
 226  * atk_state_set_remove_state:
 227  * @set: an #AtkStateSet
 228  * @type: an #AtkType
 229  *
 230  * Removes the state for the specified type from the state set.
 231  *
 232  * Returns: %TRUE if @type was the state type is in @set.
 233  **/
 234 gboolean
 235 atk_state_set_remove_state (AtkStateSet  *set,
 236                             AtkStateType type)
 237 {
 238   AtkRealStateSet *real_set;
 239   g_return_val_if_fail (ATK_IS_STATE_SET (set), FALSE);
 240
 241   real_set = (AtkRealStateSet *)set;
 242
 243   if (real_set->state & ATK_STATE (type))
 244   {
 245     real_set->state ^= ATK_STATE (type);
 246     return TRUE;
 247   }
 248   else
 249     return FALSE;
 250 }
 251
 252 /**
 253  * atk_state_set_and_sets:
 254  * @set: an #AtkStateSet
 255  * @compare_set: another #AtkStateSet
 256  *
 257  * Constructs the intersection of the two sets, returning %NULL if the
 258  * intersection is empty.
 259  *
 260  * Returns: a new #AtkStateSet which is the intersection of the two sets.
 261  **/
 262 AtkStateSet*
 263 atk_state_set_and_sets (AtkStateSet  *set,
 264                         AtkStateSet  *compare_set)
 265 {
 266   AtkRealStateSet *real_set, *real_compare_set;
 267   AtkStateSet *return_set = NULL;
 268   AtkState state;
 269
 270   g_return_val_if_fail (ATK_IS_STATE_SET (set), NULL);
 271   g_return_val_if_fail (ATK_IS_STATE_SET (compare_set), NULL);
 272
 273   real_set = (AtkRealStateSet *)set;
 274   real_compare_set = (AtkRealStateSet *)compare_set;
 275
 276   state = real_set->state & real_compare_set->state;
 277   if (state)
 278   {
 279     return_set = atk_state_set_new();
 280     ((AtkRealStateSet *) return_set)->state = state;
 281   }
 282   return return_set;
 283 }
 284
 285 /**
 286  * atk_state_set_or_sets:
 287  * @set: an #AtkStateSet
 288  * @compare_set: another #AtkStateSet
 289  *
 290  * Constructs the union of the two sets.
 291  *
 292  * Returns: a new #AtkStateSet which is the union of the two sets,
 293  * returning %NULL is empty.
 294  **/
 295 AtkStateSet*
 296 atk_state_set_or_sets (AtkStateSet  *set,
 297                        AtkStateSet  *compare_set)
 298 {
 299   AtkRealStateSet *real_set, *real_compare_set;
 300   AtkStateSet *return_set = NULL;
 301   AtkState state;
 302
 303   g_return_val_if_fail (ATK_IS_STATE_SET (set), NULL);
 304   g_return_val_if_fail (ATK_IS_STATE_SET (compare_set), NULL);
 305
 306   real_set = (AtkRealStateSet *)set;
 307   real_compare_set = (AtkRealStateSet *)compare_set;
 308
 309   state = real_set->state | real_compare_set->state;
 310
 311   return_set = atk_state_set_new();
 312   ((AtkRealStateSet *) return_set)->state = state;
 313
 314   return return_set;
 315 }
 316
 317 /**
 318  * atk_state_set_xor_sets:
 319  * @set: an #AtkStateSet
 320  * @compare_set: another #AtkStateSet
 321  *
 322  * Constructs the exclusive-or of the two sets, returning %NULL is empty.
 323  * The set returned by this operation contains the states in exactly
 324  * one of the two sets.
 325  *
 326  * Returns: a new #AtkStateSet which contains the states which are
 327  * in exactly one of the two sets.
 328  **/
 329 AtkStateSet*
 330 atk_state_set_xor_sets (AtkStateSet  *set,
 331                         AtkStateSet  *compare_set)
 332 {
 333   AtkRealStateSet *real_set, *real_compare_set;
 334   AtkStateSet *return_set = NULL;
 335   AtkState state, state1, state2;
 336
 337   g_return_val_if_fail (ATK_IS_STATE_SET (set), NULL);
 338   g_return_val_if_fail (ATK_IS_STATE_SET (compare_set), NULL);
 339
 340   real_set = (AtkRealStateSet *)set;
 341   real_compare_set = (AtkRealStateSet *)compare_set;
 342
 343   state1 = real_set->state & (~real_compare_set->state);
 344   state2 = (~real_set->state) & real_compare_set->state;
 345   state = state1 | state2;
 346
 347   if (state)
 348   {
 349     return_set = atk_state_set_new();
 350     ((AtkRealStateSet *) return_set)->state = state;
 351   }
 352   return return_set;
 353 }