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 "config.h"
  21
  22 #include "atkhypertext.h"
  23
  24 /**
  25  * SECTION:atkhypertext
  26  * @Short_description: The ATK interface which provides standard
  27  *  mechanism for manipulating hyperlinks.
  28  * @Title:AtkHypertext
  29  *
  30  * An interface used for objects which implement linking between
  31  * multiple resource or content locations, or multiple 'markers'
  32  * within a single document.  A Hypertext instance is associated with
  33  * one or more Hyperlinks, which are associated with particular
  34  * offsets within the Hypertext's included content.  While this
  35  * interface is derived from Text, there is no requirement that
  36  * Hypertext instances have textual content; they may implement Image
  37  * as well, and Hyperlinks need not have non-zero text offsets.
  38  */
  39
  40 enum {
  41   LINK_SELECTED,
  42   LAST_SIGNAL
  43 };
  44
  45 static void atk_hypertext_base_init (AtkHypertextIface *class);
  46
  47 static guint atk_hypertext_signals[LAST_SIGNAL] = { 0 };
  48
  49
  50 GType
  51 atk_hypertext_get_type (void)
  52 {
  53   static GType type = 0;
  54
  55   if (!type) {
  56     static const GTypeInfo tinfo =
  57     {
  58       sizeof (AtkHypertextIface),
  59       (GBaseInitFunc) atk_hypertext_base_init,
  60       (GBaseFinalizeFunc) NULL,
  61
  62     };
  63
  64     type = g_type_register_static (G_TYPE_INTERFACE, "AtkHypertext", &tinfo, 0);
  65   }
  66
  67   return type;
  68 }
  69
  70 static void
  71 atk_hypertext_base_init (AtkHypertextIface *class)
  72 {
  73   static gboolean initialized = FALSE;
  74
  75   if (!initialized)
  76     {
  77       /**
  78        * AtkHypertext::link-selected:
  79        * @atkhypertext: the object which received the signal.
  80        * @arg1: the index of the hyperlink which is selected
  81        *
  82        * The "link-selected" signal is emitted by an AtkHyperText
  83        * object when one of the hyperlinks associated with the object
  84        * is selected.
  85        */
  86       atk_hypertext_signals[LINK_SELECTED] =
  87         g_signal_new ("link_selected",
  88                       ATK_TYPE_HYPERTEXT,
  89                       G_SIGNAL_RUN_LAST,
  90                       G_STRUCT_OFFSET (AtkHypertextIface, link_selected),
  91                       (GSignalAccumulator) NULL, NULL,
  92                       g_cclosure_marshal_VOID__INT,
  93                       G_TYPE_NONE,
  94                       1, G_TYPE_INT);
  95
  96       initialized = TRUE;
  97     }
  98 }
  99
 100 /**
 101  * atk_hypertext_get_link:
 102  * @hypertext: an #AtkHypertext
 103  * @link_index: an integer specifying the desired link
 104  *
 105  * Gets the link in this hypertext document at index
 106  * @link_index
 107  *
 108  * Returns: (transfer none): the link in this hypertext document at
 109  * index @link_index
 110  **/
 111 AtkHyperlink*
 112 atk_hypertext_get_link (AtkHypertext  *hypertext,
 113                         gint          link_index)
 114 {
 115   AtkHypertextIface *iface;
 116
 117   g_return_val_if_fail (ATK_IS_HYPERTEXT (hypertext), NULL);
 118
 119   if (link_index < 0)
 120     return NULL;
 121
 122   iface = ATK_HYPERTEXT_GET_IFACE (hypertext);
 123
 124   if (iface->get_link)
 125     return (*(iface->get_link)) (hypertext, link_index);
 126   else
 127     return NULL;
 128 }
 129
 130 /**
 131  * atk_hypertext_get_n_links:
 132  * @hypertext: an #AtkHypertext
 133  *
 134  * Gets the number of links within this hypertext document.
 135  *
 136  * Returns: the number of links within this hypertext document
 137  **/
 138 gint
 139 atk_hypertext_get_n_links (AtkHypertext  *hypertext)
 140 {
 141   AtkHypertextIface *iface;
 142
 143   g_return_val_if_fail (ATK_IS_HYPERTEXT (hypertext), 0);
 144
 145   iface = ATK_HYPERTEXT_GET_IFACE (hypertext);
 146
 147   if (iface->get_n_links)
 148     return (*(iface->get_n_links)) (hypertext);
 149   else
 150     return 0;
 151 }
 152
 153 /**
 154  * atk_hypertext_get_link_index:
 155  * @hypertext: an #AtkHypertext
 156  * @char_index: a character index
 157  *
 158  * Gets the index into the array of hyperlinks that is associated with
 159  * the character specified by @char_index.
 160  *
 161  * Returns: an index into the array of hyperlinks in @hypertext,
 162  * or -1 if there is no hyperlink associated with this character.
 163  **/
 164 gint
 165 atk_hypertext_get_link_index (AtkHypertext  *hypertext,
 166                               gint          char_index)
 167 {
 168   AtkHypertextIface *iface;
 169
 170   g_return_val_if_fail (ATK_IS_HYPERTEXT (hypertext), -1);
 171
 172   if (char_index < 0)
 173     return -1;
 174
 175   iface = ATK_HYPERTEXT_GET_IFACE (hypertext);
 176
 177   if (iface->get_link_index)
 178     return (*(iface->get_link_index)) (hypertext, char_index);
 179   else
 180     return -1;
 181 }