shell/ev-history.c

   1 /*
   2  *  Copyright (C) 2005 Marco Pesenti Gritti
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 2, or (at your option)
   7  *  any later version.
   8  *
   9  *  This program 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
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program; if not, write to the Free Software
  16  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  *
  18  *  $Id$
  19  */
  20
  21 #include "config.h"
  22
  23 #include <glib/gi18n.h>
  24
  25 #include "ev-history.h"
  26
  27 struct _EvHistoryPrivate
  28 {
  29         GList *links;
  30         int current_index;
  31 };
  32
  33 static void ev_history_init       (EvHistory *history);
  34 static void ev_history_class_init (EvHistoryClass *class);
  35
  36 static GObjectClass *parent_class = NULL;
  37
  38 G_DEFINE_TYPE (EvHistory, ev_history, G_TYPE_OBJECT)
  39
  40 #define EV_HISTORY_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE ((object), EV_TYPE_HISTORY, EvHistoryPrivate))
  41
  42 static void
  43 ev_history_init (EvHistory *history)
  44 {
  45         history->priv = EV_HISTORY_GET_PRIVATE (history);
  46
  47         history->priv->links = NULL;
  48         history->priv->current_index = -1;
  49 }
  50
  51 static void
  52 free_links_list (GList *l)
  53 {
  54         g_list_foreach (l, (GFunc)g_object_unref, NULL);
  55         g_list_free (l);
  56 }
  57
  58 static void
  59 ev_history_finalize (GObject *object)
  60 {
  61         EvHistory *history = EV_HISTORY (object);
  62
  63         free_links_list (history->priv->links);
  64
  65         parent_class->finalize (object);
  66 }
  67
  68 static void
  69 ev_history_class_init (EvHistoryClass *class)
  70 {
  71         GObjectClass *object_class = G_OBJECT_CLASS (class);
  72
  73         object_class->finalize = ev_history_finalize;
  74
  75         parent_class = g_type_class_peek_parent (class);
  76
  77         g_type_class_add_private (object_class, sizeof (EvHistoryPrivate));
  78 }
  79
  80 void
  81 ev_history_add_link (EvHistory *history, EvLink *link)
  82 {
  83         int length;
  84
  85         g_return_if_fail (EV_IS_HISTORY (history));
  86         g_return_if_fail (EV_IS_LINK (link));
  87
  88         length = g_list_length (history->priv->links);
  89         if (history->priv->current_index < length - 1) {
  90                 GList *l = g_list_nth (history->priv->links,
  91                                        history->priv->current_index + 1);
  92
  93                 if (l->prev) {
  94                         l->prev->next = NULL;
  95                         free_links_list (l);
  96                 } else {
  97                         free_links_list (history->priv->links);
  98                         history->priv->links = NULL;
  99                 }
 100         }
 101
 102         g_object_ref (link);
 103         history->priv->links = g_list_append (history->priv->links,
 104                                               link);
 105
 106         length = g_list_length (history->priv->links);
 107         history->priv->current_index = length - 1;
 108 }
 109
 110 void
 111 ev_history_add_page (EvHistory *history, int page)
 112 {
 113         EvLink *link;
 114         char *title;
 115
 116         g_return_if_fail (EV_IS_HISTORY (history));
 117
 118         title = g_strdup_printf (_("Page %d\n"), page);
 119         link = ev_link_new_page (title, page);
 120         g_free (title);
 121
 122         ev_history_add_link (history, link);
 123 }
 124
 125 EvLink *
 126 ev_history_get_link_nth (EvHistory *history, int index)
 127 {
 128         GList *l;
 129
 130         g_return_val_if_fail (EV_IS_HISTORY (history), NULL);
 131
 132         l = g_list_nth (history->priv->links, index);
 133
 134         return EV_LINK (l->data);
 135 }
 136
 137 int
 138 ev_history_get_n_links (EvHistory *history)
 139 {
 140         g_return_val_if_fail (EV_IS_HISTORY (history), -1);
 141
 142         return g_list_length (history->priv->links);
 143 }
 144
 145 int
 146 ev_history_get_current_index (EvHistory *history)
 147 {
 148         g_return_val_if_fail (EV_IS_HISTORY (history), -1);
 149
 150         return history->priv->current_index;
 151 }
 152
 153 void
 154 ev_history_set_current_index (EvHistory *history, int index)
 155 {
 156         g_return_if_fail (EV_IS_HISTORY (history));
 157
 158         history->priv->current_index = index;
 159 }
 160
 161 EvHistory *
 162 ev_history_new (void)
 163 {
 164         return EV_HISTORY (g_object_new (EV_TYPE_HISTORY, NULL));
 165 }