atk/atkhypertext.c

   1 /* ATK - The Accessibility Toolkit for GTK+
   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 Library 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  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library 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 "atkhypertext.h"
  21
  22 /**
  23  * SECTION:atkhypertext
  24  * @Short_description: The ATK interface which provides standard
  25  *  mechanism for manipulating hyperlinks.
  26  * @Title:AtkHypertext
  27  *
  28  * An interface used for objects which implement linking between
  29  * multiple resource or content locations, or multiple 'markers'
  30  * within a single document.  A Hypertext instance is associated with
  31  * one or more Hyperlinks, which are associated with particular
  32  * offsets within the Hypertext's included content.  While this
  33  * interface is derived from Text, there is no requirement that
  34  * Hypertext instances have textual content; they may implement Image
  35  * as well, and Hyperlinks need not have non-zero text offsets.
  36  */
  37
  38 enum {
  39   LINK_SELECTED,
  40   LAST_SIGNAL
  41 };
  42
  43 static void atk_hypertext_base_init (AtkHypertextIface *class);
  44
  45 static guint atk_hypertext_signals[LAST_SIGNAL] = { 0 };
  46
  47
  48 GType
  49 atk_hypertext_get_type (void)
  50 {
  51   static GType type = 0;
  52
  53   if (!type) {
  54     static const GTypeInfo tinfo =
  55     {
  56       sizeof (AtkHypertextIface),
  57       (GBaseInitFunc) atk_hypertext_base_init,
  58       (GBaseFinalizeFunc) NULL,
  59
  60     };
  61
  62     type = g_type_register_static (G_TYPE_INTERFACE, "AtkHypertext", &tinfo, 0);
  63   }
  64
  65   return type;
  66 }
  67
  68 static void
  69 atk_hypertext_base_init (AtkHypertextIface *class)
  70 {
  71   static gboolean initialized = FALSE;
  72
  73   if (!initialized)
  74     {
  75       /**
  76        * AtkHypertext::link-selected:
  77        * @atkhypertext: the object which received the signal.
  78        * @arg1: the index of the hyperlink which is selected
  79        *
  80        * The "link-selected" signal is emitted by an AtkHyperText
  81        * object when one of the hyperlinks associated with the object
  82        * is selected.
  83        */
  84       atk_hypertext_signals[LINK_SELECTED] =
  85         g_signal_new ("link_selected",
  86                       ATK_TYPE_HYPERTEXT,
  87                       G_SIGNAL_RUN_LAST,
  88                       G_STRUCT_OFFSET (AtkHypertextIface, link_selected),
  89                       (GSignalAccumulator) NULL, NULL,
  90                       g_cclosure_marshal_VOID__INT,
  91                       G_TYPE_NONE,
  92                       1, G_TYPE_INT);
  93
  94       initialized = TRUE;
  95     }
  96 }
  97
  98 /**
  99  * atk_hypertext_get_link:
 100  * @hypertext: an #AtkHypertext
 101  * @link_index: an integer specifying the desired link
 102  *
 103  * Gets the link in this hypertext document at index
 104  * @link_index
 105  *
 106  * Returns: (transfer none): the link in this hypertext document at
 107  * index @link_index
 108  **/
 109 AtkHyperlink*
 110 atk_hypertext_get_link (AtkHypertext  *hypertext,
 111                         gint          link_index)
 112 {
 113   AtkHypertextIface *iface;
 114
 115   g_return_val_if_fail (ATK_IS_HYPERTEXT (hypertext), NULL);
 116
 117   if (link_index < 0)
 118     return NULL;
 119
 120   iface = ATK_HYPERTEXT_GET_IFACE (hypertext);
 121
 122   if (iface->get_link)
 123     return (*(iface->get_link)) (hypertext, link_index);
 124   else
 125     return NULL;
 126 }
 127
 128 /**
 129  * atk_hypertext_get_n_links:
 130  * @hypertext: an #AtkHypertext
 131  *
 132  * Gets the number of links within this hypertext document.
 133  *
 134  * Returns: the number of links within this hypertext document
 135  **/
 136 gint
 137 atk_hypertext_get_n_links (AtkHypertext  *hypertext)
 138 {
 139   AtkHypertextIface *iface;
 140
 141   g_return_val_if_fail (ATK_IS_HYPERTEXT (hypertext), 0);
 142
 143   iface = ATK_HYPERTEXT_GET_IFACE (hypertext);
 144
 145   if (iface->get_n_links)
 146     return (*(iface->get_n_links)) (hypertext);
 147   else
 148     return 0;
 149 }
 150
 151 /**
 152  * atk_hypertext_get_link_index:
 153  * @hypertext: an #AtkHypertext
 154  * @char_index: a character index
 155  *
 156  * Gets the index into the array of hyperlinks that is associated with
 157  * the character specified by @char_index.
 158  *
 159  * Returns: an index into the array of hyperlinks in @hypertext,
 160  * or -1 if there is no hyperlink associated with this character.
 161  **/
 162 gint
 163 atk_hypertext_get_link_index (AtkHypertext  *hypertext,
 164                               gint          char_index)
 165 {
 166   AtkHypertextIface *iface;
 167
 168   g_return_val_if_fail (ATK_IS_HYPERTEXT (hypertext), -1);
 169
 170   if (char_index < 0)
 171     return -1;
 172
 173   iface = ATK_HYPERTEXT_GET_IFACE (hypertext);
 174
 175   if (iface->get_link_index)
 176     return (*(iface->get_link_index)) (hypertext, char_index);
 177   else
 178     return -1;
 179 }