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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  17  *
  18  */
  19
  20 #include "config.h"
  21
  22 #include <glib/gi18n.h>
  23 #include <string.h>
  24
  25 #include "ev-history.h"
  26
  27
  28 enum
  29 {
  30         HISTORY_CHANGED,
  31         N_SIGNALS
  32 };
  33
  34 static guint signals[N_SIGNALS] = {0, };
  35
  36 struct _EvHistoryPrivate
  37 {
  38         GList *links;
  39 };
  40
  41 static void ev_history_init       (EvHistory *history);
  42 static void ev_history_class_init (EvHistoryClass *class);
  43
  44 G_DEFINE_TYPE (EvHistory, ev_history, G_TYPE_OBJECT)
  45
  46 #define EV_HISTORY_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE ((object), EV_TYPE_HISTORY, EvHistoryPrivate))
  47
  48 static void
  49 ev_history_init (EvHistory *history)
  50 {
  51         history->priv = EV_HISTORY_GET_PRIVATE (history);
  52
  53         history->priv->links = NULL;
  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         G_OBJECT_CLASS (ev_history_parent_class)->finalize (object);
  71 }
  72
  73 static void
  74 ev_history_class_init (EvHistoryClass *class)
  75 {
  76         GObjectClass *object_class = G_OBJECT_CLASS (class);
  77
  78         object_class->finalize = ev_history_finalize;
  79
  80         signals[HISTORY_CHANGED] =
  81                     g_signal_new ("changed",
  82                                   G_OBJECT_CLASS_TYPE (object_class),
  83                                   G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
  84                                   G_STRUCT_OFFSET (EvHistoryClass, changed),
  85                                   NULL, NULL,
  86                                   g_cclosure_marshal_VOID__VOID,
  87                                   G_TYPE_NONE, 0);
  88
  89         g_type_class_add_private (object_class, sizeof (EvHistoryPrivate));
  90 }
  91
  92 #define HISTORY_LENGTH   7
  93
  94 void
  95 ev_history_add_link (EvHistory *history, EvLink *link)
  96 {
  97         GList *l;
  98
  99         g_return_if_fail (EV_IS_HISTORY (history));
 100         g_return_if_fail (EV_IS_LINK (link));
 101
 102         for (l = history->priv->links; l; l = l->next) {
 103                 if (!strcmp (ev_link_get_title (EV_LINK (l->data)), ev_link_get_title (link))) {
 104                         g_object_unref (G_OBJECT (l->data));
 105                         history->priv->links = g_list_delete_link (history->priv->links, l);
 106                         break;
 107                 }
 108         }
 109
 110         g_object_ref (link);
 111         history->priv->links = g_list_append (history->priv->links,
 112                                               link);
 113
 114         if (g_list_length (history->priv->links) > HISTORY_LENGTH) {
 115                 g_object_unref (G_OBJECT (history->priv->links->data));
 116                 history->priv->links = g_list_delete_link (history->priv->links,
 117                                                            history->priv->links);
 118         }
 119
 120         g_signal_emit (history, signals[HISTORY_CHANGED], 0);
 121 }
 122
 123 EvLink *
 124 ev_history_get_link_nth (EvHistory *history, int index)
 125 {
 126         GList *l;
 127
 128         g_return_val_if_fail (EV_IS_HISTORY (history), NULL);
 129
 130         l = g_list_nth (history->priv->links, index);
 131
 132         return EV_LINK (l->data);
 133 }
 134
 135 int
 136 ev_history_get_n_links (EvHistory *history)
 137 {
 138         g_return_val_if_fail (EV_IS_HISTORY (history), -1);
 139
 140         return g_list_length (history->priv->links);
 141 }
 142
 143 EvHistory *
 144 ev_history_new (void)
 145 {
 146         return EV_HISTORY (g_object_new (EV_TYPE_HISTORY, NULL));
 147 }
 148