shell/ev-file-monitor.c

   1 /* ev-file-monitor.c
   2  *  this file is part of evince, a gnome document viewer
   3  *
   4  * Copyright (C) 2008 Carlos Garcia Campos <carlosgc@gnome.org>
   5  *
   6  * Evince is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * Evince is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  19  */
  20
  21 #include "config.h"
  22
  23 #include <glib.h>
  24 #include <gio/gio.h>
  25
  26 #include "ev-file-monitor.h"
  27
  28 enum {
  29         CHANGED,
  30         N_SIGNALS
  31 };
  32
  33 struct _EvFileMonitorPrivate {
  34         GFileMonitor *monitor;
  35
  36         guint         timeout_id;
  37 };
  38
  39 static void ev_file_monitor_timeout_start (EvFileMonitor    *ev_monitor);
  40 static void ev_file_monitor_timeout_stop  (EvFileMonitor    *ev_monitor);
  41 static void ev_file_monitor_changed_cb    (GFileMonitor     *monitor,
  42                                            GFile            *file,
  43                                            GFile            *other_file,
  44                                            GFileMonitorEvent event_type,
  45                                            EvFileMonitor    *ev_monitor);
  46
  47 #define EV_FILE_MONITOR_GET_PRIVATE(object) \
  48                 (G_TYPE_INSTANCE_GET_PRIVATE ((object), EV_TYPE_FILE_MONITOR, EvFileMonitorPrivate))
  49
  50 G_DEFINE_TYPE (EvFileMonitor, ev_file_monitor, G_TYPE_OBJECT)
  51
  52 static guint signals[N_SIGNALS];
  53
  54 static void
  55 ev_file_monitor_init (EvFileMonitor *ev_monitor)
  56 {
  57         ev_monitor->priv = EV_FILE_MONITOR_GET_PRIVATE (ev_monitor);
  58 }
  59
  60 static void
  61 ev_file_monitor_finalize (GObject *object)
  62 {
  63         EvFileMonitor *ev_monitor = EV_FILE_MONITOR (object);
  64
  65         ev_file_monitor_timeout_stop (ev_monitor);
  66
  67         if (ev_monitor->priv->monitor) {
  68                 g_signal_handlers_disconnect_by_func (ev_monitor->priv->monitor,
  69                                                       ev_file_monitor_changed_cb,
  70                                                       ev_monitor);
  71                 g_object_unref (ev_monitor->priv->monitor);
  72                 ev_monitor->priv->monitor = NULL;
  73         }
  74
  75         G_OBJECT_CLASS (ev_file_monitor_parent_class)->finalize (object);
  76 }
  77
  78 static void
  79 ev_file_monitor_class_init (EvFileMonitorClass *klass)
  80 {
  81         GObjectClass *g_object_class = G_OBJECT_CLASS (klass);
  82
  83         g_type_class_add_private (g_object_class, sizeof (EvFileMonitorPrivate));
  84
  85         g_object_class->finalize = ev_file_monitor_finalize;
  86
  87         /* Signals */
  88         signals[CHANGED] =
  89                 g_signal_new ("changed",
  90                               EV_TYPE_FILE_MONITOR,
  91                               G_SIGNAL_RUN_LAST,
  92                               G_STRUCT_OFFSET (EvFileMonitorClass, changed),
  93                               NULL, NULL,
  94                               g_cclosure_marshal_VOID__VOID,
  95                               G_TYPE_NONE, 0);
  96 }
  97
  98 static gboolean
  99 timeout_cb (EvFileMonitor *ev_monitor)
 100 {
 101         g_signal_emit (ev_monitor, signals[CHANGED], 0);
 102
 103         ev_monitor->priv->timeout_id = 0;
 104         return FALSE;
 105 }
 106
 107 static void
 108 ev_file_monitor_timeout_start (EvFileMonitor *ev_monitor)
 109 {
 110         ev_file_monitor_timeout_stop (ev_monitor);
 111
 112         ev_monitor->priv->timeout_id =
 113                 g_timeout_add_seconds (5, (GSourceFunc)timeout_cb, ev_monitor);
 114 }
 115
 116 static void
 117 ev_file_monitor_timeout_stop (EvFileMonitor *ev_monitor)
 118 {
 119         if (ev_monitor->priv->timeout_id > 0) {
 120                 g_source_remove (ev_monitor->priv->timeout_id);
 121                 ev_monitor->priv->timeout_id = 0;
 122         }
 123 }
 124
 125 static void
 126 ev_file_monitor_changed_cb (GFileMonitor     *monitor,
 127                             GFile            *file,
 128                             GFile            *other_file,
 129                             GFileMonitorEvent event_type,
 130                             EvFileMonitor    *ev_monitor)
 131 {
 132         switch (event_type) {
 133         case G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT:
 134                 ev_file_monitor_timeout_stop (ev_monitor);
 135                 g_signal_emit (ev_monitor, signals[CHANGED], 0);
 136
 137                 break;
 138         case G_FILE_MONITOR_EVENT_CHANGED:
 139                 ev_file_monitor_timeout_start (ev_monitor);
 140                 break;
 141         default:
 142                 break;
 143         }
 144 }
 145
 146 EvFileMonitor *
 147 ev_file_monitor_new (const gchar *uri)
 148 {
 149         EvFileMonitor *ev_monitor;
 150         GFile         *file;
 151         GError        *error = NULL;
 152
 153         ev_monitor = EV_FILE_MONITOR (g_object_new (EV_TYPE_FILE_MONITOR, NULL));
 154
 155         file = g_file_new_for_uri (uri);
 156         ev_monitor->priv->monitor = g_file_monitor_file (file, G_FILE_MONITOR_NONE, NULL, &error);
 157         if (ev_monitor->priv->monitor) {
 158                 g_signal_connect (ev_monitor->priv->monitor, "changed",
 159                                   G_CALLBACK (ev_file_monitor_changed_cb), ev_monitor);
 160         } else if (error) {
 161                 g_warning ("%s", error->message);
 162                 g_error_free (error);
 163         }
 164
 165         g_object_unref (file);
 166
 167         return ev_monitor;
 168 }