atk/atkhyperlink.c

   1 /* ATK -  Accessibility Toolkit
   2  * Copyright 2001, 2002, 2003 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 #include "atkhyperlink.h"
  22 #include <glib/gi18n-lib.h>
  23
  24 /**
  25  * SECTION:atkhyperlink
  26  * @Short_description: An ATK object which encapsulates a link or set
  27  *  of links in a hypertext document.
  28  * @Title:AtkHyperlink
  29  *
  30  * An ATK object which encapsulates a link or set of links (for
  31  * instance in the case of client-side image maps) in a hypertext
  32  * document.  It may implement the AtkAction interface.  AtkHyperlink
  33  * may also be used to refer to inline embedded content, since it
  34  * allows specification of a start and end offset within the host
  35  * AtkHypertext object.
  36  */
  37
  38 enum
  39 {
  40   LINK_ACTIVATED,
  41
  42   LAST_SIGNAL
  43 };
  44
  45 enum
  46 {
  47   PROP_0,  /* gobject convention */
  48
  49   PROP_SELECTED_LINK,
  50   PROP_NUMBER_ANCHORS,
  51   PROP_END_INDEX,
  52   PROP_START_INDEX,
  53   PROP_LAST
  54 };
  55
  56 static void atk_hyperlink_class_init (AtkHyperlinkClass *klass);
  57 static void atk_hyperlink_init       (AtkHyperlink      *link,
  58                                       AtkHyperlinkClass *klass);
  59
  60 static void atk_hyperlink_real_get_property (GObject            *object,
  61                                              guint              prop_id,
  62                                              GValue             *value,
  63                                              GParamSpec         *pspec);
  64
  65 static void atk_hyperlink_action_iface_init (AtkActionIface *iface);
  66
  67 static guint atk_hyperlink_signals[LAST_SIGNAL] = { 0, };
  68
  69 static gpointer  parent_class = NULL;
  70
  71 GType
  72 atk_hyperlink_get_type (void)
  73 {
  74   static GType type = 0;
  75
  76   if (!type)
  77     {
  78       static const GTypeInfo typeInfo =
  79       {
  80         sizeof (AtkHyperlinkClass),
  81         (GBaseInitFunc) NULL,
  82         (GBaseFinalizeFunc) NULL,
  83         (GClassInitFunc) atk_hyperlink_class_init,
  84         (GClassFinalizeFunc) NULL,
  85         NULL,
  86         sizeof (AtkHyperlink),
  87         0,
  88         (GInstanceInitFunc) atk_hyperlink_init,
  89       } ;
  90
  91       static const GInterfaceInfo action_info =
  92       {
  93         (GInterfaceInitFunc) atk_hyperlink_action_iface_init,
  94         (GInterfaceFinalizeFunc) NULL,
  95         NULL
  96       };
  97
  98       type = g_type_register_static (G_TYPE_OBJECT, "AtkHyperlink", &typeInfo, 0) ;
  99       g_type_add_interface_static (type, ATK_TYPE_ACTION, &action_info);
 100     }
 101   return type;
 102 }
 103
 104 static void
 105 atk_hyperlink_class_init (AtkHyperlinkClass *klass)
 106 {
 107   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 108
 109   parent_class = g_type_class_peek_parent (klass);
 110
 111   gobject_class->get_property = atk_hyperlink_real_get_property;
 112
 113   klass->link_activated = NULL;
 114
 115   /**
 116    * AtkHyperlink:selected-link:
 117    *
 118    * Selected link
 119    *
 120    * Deprecated: 1.8: Please use ATK_STATE_FOCUSABLE for all links, and
 121    * ATK_STATE_FOCUSED for focused links.
 122    */
 123   g_object_class_install_property (gobject_class,
 124                                    PROP_SELECTED_LINK,
 125                                    g_param_spec_boolean ("selected-link",
 126                                                          _("Selected Link"),
 127                                                          _("Specifies whether the AtkHyperlink object is selected"),
 128                                                          FALSE,
 129                                                          G_PARAM_READABLE));
 130   g_object_class_install_property (gobject_class,
 131                                    PROP_NUMBER_ANCHORS,
 132                                    g_param_spec_int ("number-of-anchors",
 133                                                      _("Number of Anchors"),
 134                                                      _("The number of anchors associated with the AtkHyperlink object"),
 135                                                      0,
 136                                                      G_MAXINT,
 137                                                      0,
 138                                                      G_PARAM_READABLE));
 139   g_object_class_install_property (gobject_class,
 140                                    PROP_END_INDEX,
 141                                    g_param_spec_int ("end-index",
 142                                                      _("End index"),
 143                                                      _("The end index of the AtkHyperlink object"),
 144                                                      0,
 145                                                      G_MAXINT,
 146                                                      0,
 147                                                      G_PARAM_READABLE));
 148   g_object_class_install_property (gobject_class,
 149                                    PROP_START_INDEX,
 150                                    g_param_spec_int ("start-index",
 151                                                      _("Start index"),
 152                                                      _("The start index of the AtkHyperlink object"),
 153                                                      0,
 154                                                      G_MAXINT,
 155                                                      0,
 156                                                      G_PARAM_READABLE));
 157
 158   /**
 159    * AtkHyperlink::link-activated:
 160    * @atkhyperlink: the object which received the signal.
 161    *
 162    * The signal link-activated is emitted when a link is activated.
 163    */
 164   atk_hyperlink_signals[LINK_ACTIVATED] =
 165     g_signal_new ("link_activated",
 166                   G_TYPE_FROM_CLASS (klass),
 167                   G_SIGNAL_RUN_LAST,
 168                   G_STRUCT_OFFSET (AtkHyperlinkClass, link_activated),
 169                   NULL, NULL,
 170                   g_cclosure_marshal_VOID__VOID,
 171                   G_TYPE_NONE,
 172                   0);
 173
 174 }
 175
 176 static void
 177 atk_hyperlink_init  (AtkHyperlink        *link,
 178                      AtkHyperlinkClass   *klass)
 179 {
 180 }
 181
 182 static void
 183 atk_hyperlink_real_get_property (GObject    *object,
 184                                  guint      prop_id,
 185                                  GValue     *value,
 186                                  GParamSpec *pspec)
 187 {
 188   AtkHyperlink* link;
 189
 190   link = ATK_HYPERLINK (object);
 191
 192   switch (prop_id)
 193     {
 194     case PROP_SELECTED_LINK:
 195       // This property is deprecated, also the method to get the value
 196       g_value_set_boolean (value, FALSE);
 197       break;
 198     case PROP_NUMBER_ANCHORS:
 199       g_value_set_int (value,  atk_hyperlink_get_n_anchors (link));
 200       break;
 201     case PROP_END_INDEX:
 202       g_value_set_int (value, atk_hyperlink_get_end_index (link));
 203       break;
 204     case PROP_START_INDEX:
 205       g_value_set_int (value, atk_hyperlink_get_start_index (link));
 206       break;
 207     default:
 208       break;
 209     }
 210 }
 211
 212 /**
 213  * atk_hyperlink_get_uri:
 214  * @link_: an #AtkHyperlink
 215  * @i: a (zero-index) integer specifying the desired anchor
 216  *
 217  * Get a the URI associated with the anchor specified
 218  * by @i of @link_.
 219  *
 220  * Multiple anchors are primarily used by client-side image maps.
 221  *
 222  * Returns: a string specifying the URI
 223  **/
 224 gchar*
 225 atk_hyperlink_get_uri (AtkHyperlink *link,
 226                        gint         i)
 227 {
 228   AtkHyperlinkClass *klass;
 229
 230   g_return_val_if_fail (ATK_IS_HYPERLINK (link), NULL);
 231
 232   klass = ATK_HYPERLINK_GET_CLASS (link);
 233   if (klass->get_uri)
 234     return (klass->get_uri) (link, i);
 235   else
 236     return NULL;
 237 }
 238
 239 /**
 240  * atk_hyperlink_get_object:
 241  * @link_: an #AtkHyperlink
 242  * @i: a (zero-index) integer specifying the desired anchor
 243  *
 244  * Returns the item associated with this hyperlinks nth anchor.
 245  * For instance, the returned #AtkObject will implement #AtkText
 246  * if @link_ is a text hyperlink, #AtkImage if @link_ is an image
 247  * hyperlink etc.
 248  *
 249  * Multiple anchors are primarily used by client-side image maps.
 250  *
 251  * Returns: (transfer none): an #AtkObject associated with this hyperlinks
 252  * i-th anchor
 253  **/
 254 AtkObject*
 255 atk_hyperlink_get_object (AtkHyperlink *link,
 256                           gint         i)
 257 {
 258   AtkHyperlinkClass *klass;
 259
 260   g_return_val_if_fail (ATK_IS_HYPERLINK (link), NULL);
 261
 262   klass = ATK_HYPERLINK_GET_CLASS (link);
 263   if (klass->get_object)
 264     return (klass->get_object) (link, i);
 265   else
 266     return NULL;
 267 }
 268
 269 /**
 270  * atk_hyperlink_get_end_index:
 271  * @link_: an #AtkHyperlink
 272  *
 273  * Gets the index with the hypertext document at which this link ends.
 274  *
 275  * Returns: the index with the hypertext document at which this link ends
 276  **/
 277 gint
 278 atk_hyperlink_get_end_index (AtkHyperlink *link)
 279 {
 280   AtkHyperlinkClass *klass;
 281
 282   g_return_val_if_fail (ATK_IS_HYPERLINK (link), 0);
 283
 284   klass = ATK_HYPERLINK_GET_CLASS (link);
 285   if (klass->get_end_index)
 286     return (klass->get_end_index) (link);
 287   else
 288     return 0;
 289 }
 290
 291 /**
 292  * atk_hyperlink_get_start_index:
 293  * @link_: an #AtkHyperlink
 294  *
 295  * Gets the index with the hypertext document at which this link begins.
 296  *
 297  * Returns: the index with the hypertext document at which this link begins
 298  **/
 299 gint
 300 atk_hyperlink_get_start_index (AtkHyperlink *link)
 301 {
 302   AtkHyperlinkClass *klass;
 303
 304   g_return_val_if_fail (ATK_IS_HYPERLINK (link), 0);
 305
 306   klass = ATK_HYPERLINK_GET_CLASS (link);
 307   if (klass->get_start_index)
 308     return (klass->get_start_index) (link);
 309   else
 310     return 0;
 311 }
 312
 313 /**
 314  * atk_hyperlink_is_valid:
 315  * @link_: an #AtkHyperlink
 316  *
 317  * Since the document that a link is associated with may have changed
 318  * this method returns %TRUE if the link is still valid (with
 319  * respect to the document it references) and %FALSE otherwise.
 320  *
 321  * Returns: whether or not this link is still valid
 322  **/
 323 gboolean
 324 atk_hyperlink_is_valid (AtkHyperlink *link)
 325 {
 326   AtkHyperlinkClass *klass;
 327
 328   g_return_val_if_fail (ATK_IS_HYPERLINK (link), FALSE);
 329
 330   klass = ATK_HYPERLINK_GET_CLASS (link);
 331   if (klass->is_valid)
 332     return (klass->is_valid) (link);
 333   else
 334     return FALSE;
 335 }
 336
 337 /**
 338  * atk_hyperlink_is_inline:
 339  * @link_: an #AtkHyperlink
 340  *
 341  * Indicates whether the link currently displays some or all of its
 342  *           content inline.  Ordinary HTML links will usually return
 343  *           %FALSE, but an inline &lt;src&gt; HTML element will return
 344  *           %TRUE.
 345  *
 346  * Returns: whether or not this link displays its content inline.
 347  *
 348  **/
 349 gboolean
 350 atk_hyperlink_is_inline (AtkHyperlink *link)
 351 {
 352   AtkHyperlinkClass *klass;
 353
 354   g_return_val_if_fail (ATK_IS_HYPERLINK (link), FALSE);
 355
 356   klass = ATK_HYPERLINK_GET_CLASS (link);
 357   if (klass->link_state)
 358     return (klass->link_state (link) & ATK_HYPERLINK_IS_INLINE);
 359   else
 360     return FALSE;
 361 }
 362
 363 /**
 364  * atk_hyperlink_get_n_anchors:
 365  * @link_: an #AtkHyperlink
 366  *
 367  * Gets the number of anchors associated with this hyperlink.
 368  *
 369  * Returns: the number of anchors associated with this hyperlink
 370  **/
 371 gint
 372 atk_hyperlink_get_n_anchors (AtkHyperlink *link)
 373 {
 374   AtkHyperlinkClass *klass;
 375
 376   g_return_val_if_fail (ATK_IS_HYPERLINK (link), 0);
 377
 378   klass = ATK_HYPERLINK_GET_CLASS (link);
 379   if (klass->get_n_anchors)
 380     return (klass->get_n_anchors) (link);
 381   else
 382     return 0;
 383 }
 384
 385 /**
 386  * atk_hyperlink_is_selected_link:
 387  * @link_: an #AtkHyperlink
 388  *
 389  * Determines whether this AtkHyperlink is selected
 390  *
 391  * Since: 1.4
 392  *
 393  * Deprecated: 1.8: Please use ATK_STATE_FOCUSABLE for all links,
 394  * and ATK_STATE_FOCUSED for focused links.
 395  *
 396  * Returns: True if the AtkHyperlink is selected, False otherwise
 397  **/
 398 gboolean
 399 atk_hyperlink_is_selected_link (AtkHyperlink *link)
 400 {
 401   AtkHyperlinkClass *klass;
 402
 403   g_return_val_if_fail (ATK_IS_HYPERLINK (link), FALSE);
 404
 405   klass = ATK_HYPERLINK_GET_CLASS (link);
 406   if (klass->is_selected_link)
 407     return (klass->is_selected_link) (link);
 408   else
 409     return FALSE;
 410 }
 411
 412 static void atk_hyperlink_action_iface_init (AtkActionIface *iface)
 413 {
 414   /*
 415    * We do nothing here
 416    *
 417    * When we come to derive a class from AtkHyperlink we will provide an
 418    * implementation of the AtkAction interface.
 419    */
 420 }