atk/atkhyperlinkimpl.c

   1 /* ATK -  Accessibility Toolkit
   2  * Copyright 2006 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 <string.h>
  21 #include "atkhyperlinkimpl.h"
  22
  23 /**
  24  * SECTION:atkhyperlinkimpl
  25  * @Short_description: An interface from which the AtkHyperlink
  26  *  associated with an AtkObject may be obtained.
  27  * @Title:AtkHyperlinImpl
  28  *
  29  * AtkHyperlinkImpl allows AtkObjects to refer to their associated
  30  * AtkHyperlink instance, if one exists.  AtkHyperlinkImpl differs
  31  * from AtkHyperlink in that AtkHyperlinkImpl is an interface, whereas
  32  * AtkHyperlink is a object type.  The AtkHyperlinkImpl interface
  33  * allows a client to query an AtkObject for the availability of an
  34  * associated AtkHyperlink instance, and obtain that instance.  It is
  35  * thus particularly useful in cases where embedded content or inline
  36  * content within a text object is present, since the embedding text
  37  * object implements AtkHypertext and the inline/embedded objects are
  38  * exposed as children which implement AtkHyperlinkImpl, in addition
  39  * to their being obtainable via AtkHypertext:getLink followed by
  40  * AtkHyperlink:getObject.
  41  *
  42  * The AtkHyperlinkImpl interface should be supported by objects
  43  * exposed within the hierarchy as children of an AtkHypertext
  44  * container which correspond to "links" or embedded content within
  45  * the text.  HTML anchors are not, for instance, normally exposed
  46  * this way, but embedded images and components which appear inline in
  47  * the content of a text object are. The AtkHyperlinkIface interface
  48  * allows a means of determining which children are hyperlinks in this
  49  * sense of the word, and for obtaining their corresponding
  50  * AtkHyperlink object, from which the embedding range, URI, etc. can
  51  * be obtained.
  52  *
  53  * To some extent this interface exists because, for historical
  54  * reasons, AtkHyperlink was defined as an object type, not an
  55  * interface.  Thus, in order to interact with AtkObjects via
  56  * AtkHyperlink semantics, a new interface was required.
  57  */
  58
  59 GType
  60 atk_hyperlink_impl_get_type (void)
  61 {
  62   static GType type = 0;
  63
  64   if (!type) {
  65     GTypeInfo tinfo =
  66     {
  67       sizeof (AtkHyperlinkImplIface),
  68       (GBaseInitFunc) NULL,
  69       (GBaseFinalizeFunc) NULL,
  70
  71     };
  72
  73     type = g_type_register_static (G_TYPE_INTERFACE, "AtkHyperlinkImpl", &tinfo, 0);
  74   }
  75
  76   return type;
  77 }
  78
  79 /**
  80  * atk_hyperlink_impl_get_hyperlink:
  81  * @impl: a #GObject instance that implements AtkHyperlinkImplIface
  82  *
  83  * Gets the hyperlink associated with this object.
  84  *
  85  * Returns: (transfer full):  an AtkHyperlink object which points to this
  86  * implementing AtkObject.
  87  *
  88  * Since: 1.12
  89  **/
  90 AtkHyperlink *
  91 atk_hyperlink_impl_get_hyperlink (AtkHyperlinkImpl *impl)
  92 {
  93   AtkHyperlinkImplIface *iface;
  94
  95   g_return_val_if_fail (impl != NULL, NULL);
  96   g_return_val_if_fail (ATK_IS_HYPERLINK_IMPL (impl), NULL);
  97
  98   iface = ATK_HYPERLINK_IMPL_GET_IFACE (impl);
  99
 100   if (iface->get_hyperlink)
 101     {
 102       return (iface->get_hyperlink) (impl);
 103     }
 104   return NULL;
 105 }
 106