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 enum {
  34         PROP_0,
  35         PROP_INDEX
  36 };
  37
  38 static void ev_history_init       (EvHistory *history);
  39 static void ev_history_class_init (EvHistoryClass *class);
  40
  41 static GObjectClass *parent_class = NULL;
  42
  43 G_DEFINE_TYPE (EvHistory, ev_history, G_TYPE_OBJECT)
  44
  45 #define EV_HISTORY_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE ((object), EV_TYPE_HISTORY, EvHistoryPrivate))
  46
  47 static void
  48 ev_history_init (EvHistory *history)
  49 {
  50         history->priv = EV_HISTORY_GET_PRIVATE (history);
  51
  52         history->priv->links = NULL;
  53         history->priv->current_index = -1;
  54 }
  55
  56 static void
  57 free_links_list (GList *l)
  58 {
  59         g_list_foreach (l, (GFunc)g_object_unref, NULL);
  60         g_list_free (l);
  61 }
  62
  63 static void
  64 ev_history_finalize (GObject *object)
  65 {
  66         EvHistory *history = EV_HISTORY (object);
  67
  68         free_links_list (history->priv->links);
  69
  70         parent_class->finalize (object);
  71 }
  72
  73 static void
  74 ev_history_get_property (GObject *object, guint prop_id, GValue *value,
  75                          GParamSpec *param_spec)
  76 {
  77         EvHistory *self;
  78
  79         self = EV_HISTORY (object);
  80
  81         switch (prop_id) {
  82         case PROP_INDEX:
  83                 g_value_set_int (value, self->priv->current_index);
  84                 break;
  85         default:
  86                 G_OBJECT_WARN_INVALID_PROPERTY_ID (object,
  87                                                    prop_id,
  88                                                    param_spec);
  89                 break;
  90         }
  91 }
  92
  93 static void
  94 ev_history_set_property (GObject *object, guint prop_id, const GValue *value,
  95                          GParamSpec *param_spec)
  96 {
  97         EvHistory *self;
  98
  99         self = EV_HISTORY (object);
 100
 101         switch (prop_id) {
 102         case PROP_INDEX:
 103                 ev_history_set_current_index (self, g_value_get_int (value));
 104                 break;
 105         default:
 106                 G_OBJECT_WARN_INVALID_PROPERTY_ID (object,
 107                                                    prop_id,
 108                                                    param_spec);
 109                 break;
 110         }
 111 }
 112
 113 static void
 114 ev_history_class_init (EvHistoryClass *class)
 115 {
 116         GObjectClass *object_class = G_OBJECT_CLASS (class);
 117
 118         object_class->finalize = ev_history_finalize;
 119         object_class->set_property = ev_history_set_property;
 120         object_class->get_property = ev_history_get_property;
 121
 122         parent_class = g_type_class_peek_parent (class);
 123
 124         g_object_class_install_property (object_class,
 125                                          PROP_INDEX,
 126                                          g_param_spec_int ("index",
 127                                                            "Current Index",
 128                                                            "The current index",
 129                                                             -1,
 130                                                             G_MAXINT,
 131                                                             0,
 132                                                             G_PARAM_READWRITE));
 133
 134         g_type_class_add_private (object_class, sizeof (EvHistoryPrivate));
 135 }
 136
 137 void
 138 ev_history_add_link (EvHistory *history, EvLink *link)
 139 {
 140         int length;
 141
 142         g_return_if_fail (EV_IS_HISTORY (history));
 143         g_return_if_fail (EV_IS_LINK (link));
 144
 145         length = g_list_length (history->priv->links);
 146         if (history->priv->current_index < length - 1) {
 147                 GList *l = g_list_nth (history->priv->links,
 148                                        history->priv->current_index + 1);
 149
 150                 if (l->prev) {
 151                         l->prev->next = NULL;
 152                         free_links_list (l);
 153                 } else {
 154                         free_links_list (history->priv->links);
 155                         history->priv->links = NULL;
 156                 }
 157         }
 158
 159         g_object_ref (link);
 160         history->priv->links = g_list_append (history->priv->links,
 161                                               link);
 162
 163         length = g_list_length (history->priv->links);
 164         history->priv->current_index = length - 1;
 165 }
 166
 167 void
 168 ev_history_add_page (EvHistory *history, int page)
 169 {
 170         EvLink *link;
 171         char *title;
 172
 173         g_return_if_fail (EV_IS_HISTORY (history));
 174
 175         title = g_strdup_printf (_("Page %d"), page);
 176         link = ev_link_new_page (title, page);
 177         g_free (title);
 178
 179         ev_history_add_link (history, link);
 180 }
 181
 182 EvLink *
 183 ev_history_get_link_nth (EvHistory *history, int index)
 184 {
 185         GList *l;
 186
 187         g_return_val_if_fail (EV_IS_HISTORY (history), NULL);
 188
 189         l = g_list_nth (history->priv->links, index);
 190
 191         return EV_LINK (l->data);
 192 }
 193
 194 int
 195 ev_history_get_n_links (EvHistory *history)
 196 {
 197         g_return_val_if_fail (EV_IS_HISTORY (history), -1);
 198
 199         return g_list_length (history->priv->links);
 200 }
 201
 202 int
 203 ev_history_get_current_index (EvHistory *history)
 204 {
 205         g_return_val_if_fail (EV_IS_HISTORY (history), -1);
 206
 207         return history->priv->current_index;
 208 }
 209
 210 void
 211 ev_history_set_current_index (EvHistory *history, int index)
 212 {
 213         g_return_if_fail (EV_IS_HISTORY (history));
 214
 215         history->priv->current_index = index;
 216
 217         g_object_notify (G_OBJECT (history), "index");
 218 }
 219
 220 EvHistory *
 221 ev_history_new (void)
 222 {
 223         return EV_HISTORY (g_object_new (EV_TYPE_HISTORY, NULL));
 224 }