Automaticly reload the document when the file has changed on disk. Bug

2008-06-15  Carlos Garcia Campos  <carlosgc@gnome.org>

	* shell/Makefile.am:
	* shell/ev-file-monitor.[ch]:
	* shell/ev-window.c: (ev_window_document_changed),
	(ev_window_clear_reload_job), (ev_window_load_job_cb),
	(ev_window_reload_job_cb), (ev_window_open_uri),
	(ev_window_reload_document), (ev_window_cmd_view_reload),
	(ev_window_dispose):

	Automaticly reload the document when the file has changed on
	disk. Bug #304249.

svn path=/trunk/; revision=3051

1 files changed, 168 insertions, 0 deletions

diff --git a/shell/ev-file-monitor.c b/shell/ev-file-monitor.c
new file mode 100644
index 0000000..3db0e78
--- /dev/null
+++ b/shell/ev-file-monitor.c
@@ -0,0 +1,168 @@
+/* ev-file-monitor.c
+ *  this file is part of evince, a gnome document viewer
+ *
+ * Copyright (C) 2008 Carlos Garcia Campos <carlosgc@gnome.org>
+ *
+ * Evince is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Evince is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+
+#include <glib.h>
+#include <gio/gio.h>
+
+#include "ev-file-monitor.h"
+
+enum {
+	CHANGED,
+	N_SIGNALS
+};
+
+struct _EvFileMonitorPrivate {
+	GFileMonitor *monitor;
+
+	guint         timeout_id;
+};
+
+static void ev_file_monitor_timeout_start (EvFileMonitor    *ev_monitor);
+static void ev_file_monitor_timeout_stop  (EvFileMonitor    *ev_monitor);
+static void ev_file_monitor_changed_cb    (GFileMonitor     *monitor,
+					   GFile            *file,
+					   GFile            *other_file,
+					   GFileMonitorEvent event_type,
+					   EvFileMonitor    *ev_monitor);
+	
+#define EV_FILE_MONITOR_GET_PRIVATE(object) \
+                (G_TYPE_INSTANCE_GET_PRIVATE ((object), EV_TYPE_FILE_MONITOR, EvFileMonitorPrivate))
+
+G_DEFINE_TYPE (EvFileMonitor, ev_file_monitor, G_TYPE_OBJECT)
+
+static guint signals[N_SIGNALS];
+
+static void
+ev_file_monitor_init (EvFileMonitor *ev_monitor)
+{
+	ev_monitor->priv = EV_FILE_MONITOR_GET_PRIVATE (ev_monitor);
+}
+
+static void
+ev_file_monitor_finalize (GObject *object)
+{
+	EvFileMonitor *ev_monitor = EV_FILE_MONITOR (object);
+
+	ev_file_monitor_timeout_stop (ev_monitor);
+	
+	if (ev_monitor->priv->monitor) {
+		g_signal_handlers_disconnect_by_func (ev_monitor->priv->monitor,
+						      ev_file_monitor_changed_cb,
+						      ev_monitor);
+		g_object_unref (ev_monitor->priv->monitor);
+		ev_monitor->priv->monitor = NULL;
+	}
+
+	G_OBJECT_CLASS (ev_file_monitor_parent_class)->finalize (object);
+}
+
+static void
+ev_file_monitor_class_init (EvFileMonitorClass *klass)
+{
+	GObjectClass *g_object_class = G_OBJECT_CLASS (klass);
+
+	g_type_class_add_private (g_object_class, sizeof (EvFileMonitorPrivate));
+
+	g_object_class->finalize = ev_file_monitor_finalize;
+
+	/* Signals */
+	signals[CHANGED] =
+		g_signal_new ("changed",
+			      EV_TYPE_FILE_MONITOR,
+			      G_SIGNAL_RUN_LAST,
+			      G_STRUCT_OFFSET (EvFileMonitorClass, changed),
+			      NULL, NULL,
+			      g_cclosure_marshal_VOID__VOID,
+			      G_TYPE_NONE, 0);
+}
+
+static gboolean
+timeout_cb (EvFileMonitor *ev_monitor)
+{
+	g_signal_emit (ev_monitor, signals[CHANGED], 0);
+	
+	ev_monitor->priv->timeout_id = 0;
+	return FALSE;
+}
+
+static void
+ev_file_monitor_timeout_start (EvFileMonitor *ev_monitor)
+{
+	ev_file_monitor_timeout_stop (ev_monitor);
+	
+	ev_monitor->priv->timeout_id =
+		g_timeout_add_seconds (5, (GSourceFunc)timeout_cb, ev_monitor);
+}
+
+static void
+ev_file_monitor_timeout_stop (EvFileMonitor *ev_monitor)
+{
+	if (ev_monitor->priv->timeout_id > 0) {
+		g_source_remove (ev_monitor->priv->timeout_id);
+		ev_monitor->priv->timeout_id = 0;
+	}
+}
+
+static void
+ev_file_monitor_changed_cb (GFileMonitor     *monitor,
+			    GFile            *file,
+			    GFile            *other_file,
+			    GFileMonitorEvent event_type,
+			    EvFileMonitor    *ev_monitor)
+{
+	switch (event_type) {
+	case G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT:
+		ev_file_monitor_timeout_stop (ev_monitor);
+		g_signal_emit (ev_monitor, signals[CHANGED], 0);
+
+		break;
+	case G_FILE_MONITOR_EVENT_CHANGED:
+		ev_file_monitor_timeout_start (ev_monitor);
+		break;
+	default:
+		break;
+	}
+}
+
+EvFileMonitor *
+ev_file_monitor_new (const gchar *uri)
+{
+	EvFileMonitor *ev_monitor;
+	GFile         *file;
+	GError        *error = NULL;
+	
+	ev_monitor = EV_FILE_MONITOR (g_object_new (EV_TYPE_FILE_MONITOR, NULL));
+
+	file = g_file_new_for_uri (uri);
+	ev_monitor->priv->monitor = g_file_monitor_file (file, G_FILE_MONITOR_NONE, NULL, &error);
+	if (ev_monitor->priv->monitor) {
+		g_signal_connect (G_OBJECT (ev_monitor->priv->monitor), "changed",
+				  G_CALLBACK (ev_file_monitor_changed_cb), ev_monitor);
+	} else if (error) {
+		g_warning ("%s", error->message);
+		g_error_free (error);
+	}
+
+	g_object_unref (file);
+
+	return ev_monitor;
+}