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 "config.h"
  21
  22 #include <glib-object.h>
  23
  24 #include "atkobject.h"
  25 #include "atkstateset.h"
  26
  27 /**
  28  * SECTION:atkstateset
  29  * @Short_description: An AtkStateSet contains the states of an object.
  30  * @Title:AtkStateSet
  31  *
  32  * An AtkStateSet is a read-only representation of the full set of #AtkStates
  33  * that apply to an object at a given time. This set is not meant to be
  34  * modified, but rather created when #atk_object_ref_state_set() is called.
  35  */
  36
  37 #define ATK_STATE(state_enum)             ((AtkState)((guint64)1 << ((state_enum)%64)))
  38
  39 struct _AtkRealStateSet
  40 {
  41   GObject parent;
  42
  43   AtkState state;
  44 };
  45
  46 typedef struct _AtkRealStateSet      AtkRealStateSet;
  47
  48 static void            atk_state_set_class_init       (AtkStateSetClass  *klass);
  49
  50 GType
  51 atk_state_set_get_type (void)
  52 {
  53   static GType type = 0;
  54
  55   if (!type)
  56     {
  57       static const GTypeInfo typeInfo =
  58       {
  59         sizeof (AtkStateSetClass),
  60         (GBaseInitFunc) NULL,
  61         (GBaseFinalizeFunc) NULL,
  62         (GClassInitFunc) atk_state_set_class_init,
  63         (GClassFinalizeFunc) NULL,
  64         NULL,
  65         sizeof (AtkRealStateSet),
  66         0,
  67         (GInstanceInitFunc) NULL,
  68       } ;
  69       type = g_type_register_static (G_TYPE_OBJECT, "AtkStateSet", &typeInfo, 0) ;
  70     }
  71   return type;
  72 }
  73
  74 static void
  75 atk_state_set_class_init (AtkStateSetClass *klass)
  76 {
  77 }
  78
  79 /**
  80  * atk_state_set_new:
  81  *
  82  * Creates a new empty state set.
  83  *
  84  * Returns: a new #AtkStateSet
  85  **/
  86 AtkStateSet*
  87 atk_state_set_new (void)
  88 {
  89   return (AtkStateSet*) g_object_new (ATK_TYPE_STATE_SET, NULL);
  90 }
  91
  92 /**
  93  * atk_state_set_is_empty:
  94  * @set: an #AtkStateType
  95  *
  96  * Checks whether the state set is empty, i.e. has no states set.
  97  *
  98  * Returns: %TRUE if @set has no states set, otherwise %FALSE
  99  **/
 100 gboolean
 101 atk_state_set_is_empty (AtkStateSet   *set)
 102 {
 103   AtkRealStateSet *real_set;
 104   g_return_val_if_fail (ATK_IS_STATE_SET (set), FALSE);
 105
 106   real_set = (AtkRealStateSet *)set;
 107
 108   if (real_set->state)
 109     return FALSE;
 110   else
 111     return TRUE;
 112 }
 113
 114 /**
 115  * atk_state_set_add_state:
 116  * @set: an #AtkStateSet
 117  * @type: an #AtkStateType
 118  *
 119  * Adds the state of the specified type to the state set if it is not already
 120  * present.
 121  *
 122  * Note that because an #AtkStateSet is a read-only object, this method should
 123  * be used to add a state to a newly-created set which will then be returned by
 124  * #atk_object_ref_state_set. It should not be used to modify the existing state
 125  * of an object. See also #atk_object_notify_state_change.
 126  *
 127  * Returns: %TRUE if  the state for @type is not already in @set.
 128  **/
 129 gboolean
 130 atk_state_set_add_state (AtkStateSet   *set,
 131                          AtkStateType  type)
 132 {
 133   AtkRealStateSet *real_set;
 134   g_return_val_if_fail (ATK_IS_STATE_SET (set), FALSE);
 135
 136   real_set = (AtkRealStateSet *)set;
 137
 138   if (real_set->state & ATK_STATE (type))
 139     return FALSE;
 140   else
 141   {
 142     real_set->state |= ATK_STATE (type);
 143     return TRUE;
 144   }
 145 }
 146 /**
 147  * atk_state_set_add_states:
 148  * @set: an #AtkStateSet
 149  * @types: (array length=n_types): an array of #AtkStateType
 150  * @n_types: The number of elements in the array
 151  *
 152  * Adds the states of the specified types to the state set.
 153  *
 154  * Note that because an #AtkStateSet is a read-only object, this method should
 155  * be used to add states to a newly-created set which will then be returned by
 156  * #atk_object_ref_state_set. It should not be used to modify the existing state
 157  * of an object. See also #atk_object_notify_state_change.
 158  **/
 159 void
 160 atk_state_set_add_states (AtkStateSet   *set,
 161                           AtkStateType  *types,
 162                           gint          n_types)
 163 {
 164   AtkRealStateSet *real_set;
 165   gint     i;
 166   g_return_if_fail (ATK_IS_STATE_SET (set));
 167
 168   real_set = (AtkRealStateSet *)set;
 169
 170   for (i = 0; i < n_types; i++)
 171   {
 172     real_set->state |= ATK_STATE (types[i]);
 173   }
 174 }
 175
 176 /**
 177  * atk_state_set_clear_states:
 178  * @set: an #AtkStateSet
 179  *
 180  * Removes all states from the state set.
 181  **/
 182 void
 183 atk_state_set_clear_states (AtkStateSet   *set)
 184 {
 185   AtkRealStateSet *real_set;
 186   g_return_if_fail (ATK_IS_STATE_SET (set));
 187
 188   real_set = (AtkRealStateSet *)set;
 189
 190   real_set->state = 0;
 191 }
 192
 193 /**
 194  * atk_state_set_contains_state:
 195  * @set: an #AtkStateSet
 196  * @type: an #AtkStateType
 197  *
 198  * Checks whether the state for the specified type is in the specified set.
 199  *
 200  * Returns: %TRUE if @type is the state type is in @set.
 201  **/
 202 gboolean
 203 atk_state_set_contains_state (AtkStateSet   *set,
 204                               AtkStateType  type)
 205 {
 206   AtkRealStateSet *real_set;
 207   g_return_val_if_fail (ATK_IS_STATE_SET (set), FALSE);
 208
 209   real_set = (AtkRealStateSet *)set;
 210
 211   if (real_set->state & ATK_STATE (type))
 212     return TRUE;
 213   else
 214     return FALSE;
 215 }
 216
 217 /**
 218  * atk_state_set_contains_states:
 219  * @set: an #AtkStateSet
 220  * @types: (array length=n_types): an array of #AtkStateType
 221  * @n_types: The number of elements in the array
 222  *
 223  * Checks whether the states for all the specified types are in the
 224  * specified set.
 225  *
 226  * Returns: %TRUE if all the states for @type are in @set.
 227  **/
 228 gboolean
 229 atk_state_set_contains_states (AtkStateSet   *set,
 230                                AtkStateType  *types,
 231                                gint          n_types)
 232 {
 233   AtkRealStateSet *real_set;
 234   gint i;
 235   g_return_val_if_fail (ATK_IS_STATE_SET (set), FALSE);
 236
 237   real_set = (AtkRealStateSet *)set;
 238
 239   for (i = 0; i < n_types; i++)
 240   {
 241     if (!(real_set->state & ATK_STATE (types[i])))
 242       return FALSE;
 243   }
 244   return TRUE;
 245 }
 246
 247 /**
 248  * atk_state_set_remove_state:
 249  * @set: an #AtkStateSet
 250  * @type: an #AtkType
 251  *
 252  * Removes the state for the specified type from the state set.
 253  *
 254  * Note that because an #AtkStateSet is a read-only object, this method should
 255  * be used to remove a state to a newly-created set which will then be returned
 256  * by #atk_object_ref_state_set. It should not be used to modify the existing
 257  * state of an object. See also #atk_object_notify_state_change.
 258  *
 259  * Returns: %TRUE if @type was the state type is in @set.
 260  **/
 261 gboolean
 262 atk_state_set_remove_state (AtkStateSet  *set,
 263                             AtkStateType type)
 264 {
 265   AtkRealStateSet *real_set;
 266   g_return_val_if_fail (ATK_IS_STATE_SET (set), FALSE);
 267
 268   real_set = (AtkRealStateSet *)set;
 269
 270   if (real_set->state & ATK_STATE (type))
 271   {
 272     real_set->state ^= ATK_STATE (type);
 273     return TRUE;
 274   }
 275   else
 276     return FALSE;
 277 }
 278
 279 /**
 280  * atk_state_set_and_sets:
 281  * @set: an #AtkStateSet
 282  * @compare_set: another #AtkStateSet
 283  *
 284  * Constructs the intersection of the two sets, returning %NULL if the
 285  * intersection is empty.
 286  *
 287  * Returns: (transfer full): a new #AtkStateSet which is the intersection of
 288  * the two sets.
 289  **/
 290 AtkStateSet*
 291 atk_state_set_and_sets (AtkStateSet  *set,
 292                         AtkStateSet  *compare_set)
 293 {
 294   AtkRealStateSet *real_set, *real_compare_set;
 295   AtkStateSet *return_set = NULL;
 296   AtkState state;
 297
 298   g_return_val_if_fail (ATK_IS_STATE_SET (set), NULL);
 299   g_return_val_if_fail (ATK_IS_STATE_SET (compare_set), NULL);
 300
 301   real_set = (AtkRealStateSet *)set;
 302   real_compare_set = (AtkRealStateSet *)compare_set;
 303
 304   state = real_set->state & real_compare_set->state;
 305   if (state)
 306   {
 307     return_set = atk_state_set_new();
 308     ((AtkRealStateSet *) return_set)->state = state;
 309   }
 310   return return_set;
 311 }
 312
 313 /**
 314  * atk_state_set_or_sets:
 315  * @set: an #AtkStateSet
 316  * @compare_set: another #AtkStateSet
 317  *
 318  * Constructs the union of the two sets.
 319  *
 320  * Returns: (nullable) (transfer full): a new #AtkStateSet which is
 321  * the union of the two sets, returning %NULL is empty.
 322  **/
 323 AtkStateSet*
 324 atk_state_set_or_sets (AtkStateSet  *set,
 325                        AtkStateSet  *compare_set)
 326 {
 327   AtkRealStateSet *real_set, *real_compare_set;
 328   AtkStateSet *return_set = NULL;
 329   AtkState state;
 330
 331   g_return_val_if_fail (ATK_IS_STATE_SET (set), NULL);
 332   g_return_val_if_fail (ATK_IS_STATE_SET (compare_set), NULL);
 333
 334   real_set = (AtkRealStateSet *)set;
 335   real_compare_set = (AtkRealStateSet *)compare_set;
 336
 337   state = real_set->state | real_compare_set->state;
 338
 339   if (state)
 340   {
 341     return_set = atk_state_set_new();
 342     ((AtkRealStateSet *) return_set)->state = state;
 343   }
 344
 345   return return_set;
 346 }
 347
 348 /**
 349  * atk_state_set_xor_sets:
 350  * @set: an #AtkStateSet
 351  * @compare_set: another #AtkStateSet
 352  *
 353  * Constructs the exclusive-or of the two sets, returning %NULL is empty.
 354  * The set returned by this operation contains the states in exactly
 355  * one of the two sets.
 356  *
 357  * Returns: (transfer full): a new #AtkStateSet which contains the states
 358  * which are in exactly one of the two sets.
 359  **/
 360 AtkStateSet*
 361 atk_state_set_xor_sets (AtkStateSet  *set,
 362                         AtkStateSet  *compare_set)
 363 {
 364   AtkRealStateSet *real_set, *real_compare_set;
 365   AtkStateSet *return_set = NULL;
 366   AtkState state, state1, state2;
 367
 368   g_return_val_if_fail (ATK_IS_STATE_SET (set), NULL);
 369   g_return_val_if_fail (ATK_IS_STATE_SET (compare_set), NULL);
 370
 371   real_set = (AtkRealStateSet *)set;
 372   real_compare_set = (AtkRealStateSet *)compare_set;
 373
 374   state1 = real_set->state & (~real_compare_set->state);
 375   state2 = (~real_set->state) & real_compare_set->state;
 376   state = state1 | state2;
 377
 378   if (state)
 379   {
 380     return_set = atk_state_set_new();
 381     ((AtkRealStateSet *) return_set)->state = state;
 382   }
 383   return return_set;
 384 }