atk/atkselection.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 "atkselection.h"
  21
  22 enum {
  23   SELECTION_CHANGED,
  24   LAST_SIGNAL
  25 };
  26
  27 static void atk_selection_base_init (gpointer *g_class);
  28
  29 static guint atk_selection_signals[LAST_SIGNAL] = { 0 };
  30
  31 GType
  32 atk_selection_get_type (void)
  33 {
  34   static GType type = 0;
  35
  36   if (!type) {
  37     GTypeInfo tinfo =
  38     {
  39       sizeof (AtkSelectionIface),
  40       (GBaseInitFunc)atk_selection_base_init,
  41       (GBaseFinalizeFunc) NULL,
  42
  43     };
  44
  45     type = g_type_register_static (G_TYPE_INTERFACE, "AtkSelection", &tinfo, 0);
  46   }
  47
  48   return type;
  49 }
  50
  51 static void
  52 atk_selection_base_init (gpointer *g_class)
  53 {
  54   static gboolean initialized = FALSE;
  55
  56   if (! initialized)
  57     {
  58       atk_selection_signals[SELECTION_CHANGED] =
  59         g_signal_new ("selection_changed",
  60                       ATK_TYPE_SELECTION,
  61                       G_SIGNAL_RUN_LAST,
  62                       G_STRUCT_OFFSET (AtkSelectionIface, selection_changed),
  63                       (GSignalAccumulator) NULL, NULL,
  64                       g_cclosure_marshal_VOID__VOID,
  65                       G_TYPE_NONE, 0);
  66
  67
  68       initialized = TRUE;
  69     }
  70 }
  71
  72 /**
  73  * atk_selection_add_selection:
  74  * @selection: a #GObject instance that implements AtkSelectionIface
  75  * @i: a #gint specifying the child index.
  76  *
  77  * Adds the specified accessible child of the object to the
  78  * object's selection.
  79  *
  80  * Returns: TRUE if success, FALSE otherwise.
  81  **/
  82 gboolean
  83 atk_selection_add_selection (AtkSelection *obj,
  84                              gint         i)
  85 {
  86   AtkSelectionIface *iface;
  87
  88   g_return_val_if_fail (ATK_IS_SELECTION (obj), FALSE);
  89
  90   iface = ATK_SELECTION_GET_IFACE (obj);
  91
  92   if (iface->add_selection)
  93     return (iface->add_selection) (obj, i);
  94   else
  95     return FALSE;
  96 }
  97
  98 /**
  99  * atk_selection_clear_selection:
 100  * @selection: a #GObject instance that implements AtkSelectionIface
 101  *
 102  * Clears the selection in the object so that no children in the object
 103  * are selected.
 104  *
 105  * Returns: TRUE if success, FALSE otherwise.
 106  **/
 107 gboolean
 108 atk_selection_clear_selection (AtkSelection *obj)
 109 {
 110   AtkSelectionIface *iface;
 111
 112   g_return_val_if_fail (ATK_IS_SELECTION (obj), FALSE);
 113
 114   iface = ATK_SELECTION_GET_IFACE (obj);
 115
 116   if (iface->clear_selection)
 117     return (iface->clear_selection) (obj);
 118   else
 119     return FALSE;
 120 }
 121
 122 /**
 123  * atk_selection_ref_selection:
 124  * @selection: a #GObject instance that implements AtkSelectionIface
 125  * @i: a #gint specifying the index in the selection set.  (e.g. the
 126  * ith selection as opposed to the ith child).
 127  *
 128  * Gets a reference to the accessible object representing the specified
 129  * selected child of the object.
 130  * Note: callers should not rely on %NULL or on a zero value for
 131  * indication of whether AtkSelectionIface is implemented, they should
 132  * use type checking/interface checking macros or the
 133  * atk_get_accessible_value() convenience method.
 134  *
 135  * Returns: an #AtkObject representing the selected accessible , or %NULL
 136  * if @selection does not implement this interface.
 137  **/
 138 AtkObject*
 139 atk_selection_ref_selection (AtkSelection *obj,
 140                              gint         i)
 141 {
 142   AtkSelectionIface *iface;
 143
 144   g_return_val_if_fail (ATK_IS_SELECTION (obj), NULL);
 145
 146   iface = ATK_SELECTION_GET_IFACE (obj);
 147
 148   if (iface->ref_selection)
 149     return (iface->ref_selection) (obj, i);
 150   else
 151     return NULL;
 152 }
 153
 154 /**
 155  * atk_selection_get_selection_count:
 156  * @selection: a #GObject instance that implements AtkSelectionIface
 157  *
 158  * Gets the number of accessible children currently selected.
 159  * Note: callers should not rely on %NULL or on a zero value for
 160  * indication of whether AtkSelectionIface is implemented, they should
 161  * use type checking/interface checking macros or the
 162  * atk_get_accessible_value() convenience method.
 163  *
 164  * Returns: a gint representing the number of items selected, or 0
 165  * if @selection does not implement this interface.
 166  **/
 167 gint
 168 atk_selection_get_selection_count (AtkSelection *obj)
 169 {
 170   AtkSelectionIface *iface;
 171
 172   g_return_val_if_fail (ATK_IS_SELECTION (obj), 0);
 173
 174   iface = ATK_SELECTION_GET_IFACE (obj);
 175
 176   if (iface->get_selection_count)
 177     return (iface->get_selection_count) (obj);
 178   else
 179     return 0;
 180 }
 181
 182 /**
 183  * atk_selection_is_child_selected:
 184  * @selection: a #GObject instance that implements AtkSelectionIface
 185  * @i: a #gint specifying the child index.
 186  *
 187  * Determines if the current child of this object is selected
 188  * Note: callers should not rely on %NULL or on a zero value for
 189  * indication of whether AtkSelectionIface is implemented, they should
 190  * use type checking/interface checking macros or the
 191  * atk_get_accessible_value() convenience method.
 192  *
 193  * Returns: a gboolean representing the specified child is selected, or 0
 194  * if @selection does not implement this interface.
 195  **/
 196 gboolean
 197 atk_selection_is_child_selected (AtkSelection *obj,
 198                                  gint         i)
 199 {
 200   AtkSelectionIface *iface;
 201
 202   g_return_val_if_fail (ATK_IS_SELECTION (obj), FALSE);
 203
 204   iface = ATK_SELECTION_GET_IFACE (obj);
 205
 206   if (iface->is_child_selected)
 207     return (iface->is_child_selected) (obj, i);
 208   else
 209     return FALSE;
 210 }
 211
 212 /**
 213  * atk_selection_remove_selection:
 214  * @selection: a #GObject instance that implements AtkSelectionIface
 215  * @i: a #gint specifying the index in the selection set.  (e.g. the
 216  * ith selection as opposed to the ith child).
 217  *
 218  * Removes the specified child of the object from the object's selection.
 219  *
 220  * Returns: TRUE if success, FALSE otherwise.
 221  **/
 222 gboolean
 223 atk_selection_remove_selection (AtkSelection *obj,
 224                                 gint         i)
 225 {
 226   AtkSelectionIface *iface;
 227
 228   g_return_val_if_fail (ATK_IS_SELECTION (obj), FALSE);
 229
 230   iface = ATK_SELECTION_GET_IFACE (obj);
 231
 232   if (iface->remove_selection)
 233     return (iface->remove_selection) (obj, i);
 234   else
 235     return FALSE;
 236 }
 237
 238 /**
 239  * atk_selection_select_all_selection:
 240  * @selection: a #GObject instance that implements AtkSelectionIface
 241  *
 242  * Causes every child of the object to be selected if the object
 243  * supports multiple selections.
 244  *
 245  * Returns: TRUE if success, FALSE otherwise.
 246  **/
 247 gboolean
 248 atk_selection_select_all_selection (AtkSelection *obj)
 249 {
 250   AtkSelectionIface *iface;
 251
 252   g_return_val_if_fail (ATK_IS_SELECTION (obj), FALSE);
 253
 254   iface = ATK_SELECTION_GET_IFACE (obj);
 255
 256   if (iface->select_all_selection)
 257     return (iface->select_all_selection) (obj);
 258   else
 259     return FALSE;
 260 }