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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 }