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/*
nautilus-trash-monitor.c: Nautilus trash state watcher.
Copyright (C) 2000, 2001 Eazel, Inc.
This program 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.
This program 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, see <http://www.gnu.org/licenses/>.
Author: Pavel Cisler <pavel@eazel.com>
*/
#include <config.h>
#include "nautilus-trash-monitor.h"
#include "nautilus-directory-notify.h"
#include "nautilus-directory.h"
#include "nautilus-file-attributes.h"
#include <eel/eel-debug.h>
#include <gio/gio.h>
#include <string.h>
struct NautilusTrashMonitorDetails {
gboolean empty;
GFileMonitor *file_monitor;
};
enum {
TRASH_STATE_CHANGED,
LAST_SIGNAL
};
static guint signals[LAST_SIGNAL];
static NautilusTrashMonitor *nautilus_trash_monitor = NULL;
G_DEFINE_TYPE(NautilusTrashMonitor, nautilus_trash_monitor, G_TYPE_OBJECT)
static void
nautilus_trash_monitor_finalize (GObject *object)
{
NautilusTrashMonitor *trash_monitor;
trash_monitor = NAUTILUS_TRASH_MONITOR (object);
if (trash_monitor->details->file_monitor) {
g_object_unref (trash_monitor->details->file_monitor);
}
G_OBJECT_CLASS (nautilus_trash_monitor_parent_class)->finalize (object);
}
static void
nautilus_trash_monitor_class_init (NautilusTrashMonitorClass *klass)
{
GObjectClass *object_class;
object_class = G_OBJECT_CLASS (klass);
object_class->finalize = nautilus_trash_monitor_finalize;
signals[TRASH_STATE_CHANGED] = g_signal_new
("trash-state-changed",
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (NautilusTrashMonitorClass, trash_state_changed),
NULL, NULL,
g_cclosure_marshal_VOID__BOOLEAN,
G_TYPE_NONE, 1,
G_TYPE_BOOLEAN);
g_type_class_add_private (object_class, sizeof(NautilusTrashMonitorDetails));
}
static void
update_empty_info (NautilusTrashMonitor *trash_monitor,
gboolean is_empty)
{
if (trash_monitor->details->empty == is_empty) {
return;
}
trash_monitor->details->empty = is_empty;
/* trash got empty or full, notify everyone who cares */
g_signal_emit (trash_monitor,
signals[TRASH_STATE_CHANGED], 0,
trash_monitor->details->empty);
}
/* Use G_FILE_ATTRIBUTE_TRASH_ITEM_COUNT since we only want to know whether the
* trash is empty or not, not access its children. This is available for the
* trash backend since it uses a cache. In this way we prevent flooding the
* trash backend with enumeration requests when trashing > 1000 files
*/
static void
trash_query_info_cb (GObject *source,
GAsyncResult *res,
gpointer user_data)
{
NautilusTrashMonitor *trash_monitor = user_data;
GFileInfo *info;
guint32 item_count;
gboolean is_empty = TRUE;
info = g_file_query_info_finish (G_FILE (source), res, NULL);
if (info != NULL) {
item_count = g_file_info_get_attribute_uint32 (info,
G_FILE_ATTRIBUTE_TRASH_ITEM_COUNT);
is_empty = item_count == 0;
g_object_unref (info);
}
update_empty_info (trash_monitor, is_empty);
g_object_unref (trash_monitor);
}
static void
schedule_update_info (NautilusTrashMonitor *trash_monitor)
{
GFile *location;
location = g_file_new_for_uri ("trash:///");
g_file_query_info_async (location,
G_FILE_ATTRIBUTE_TRASH_ITEM_COUNT,
G_FILE_QUERY_INFO_NONE,
G_PRIORITY_DEFAULT, NULL,
trash_query_info_cb, g_object_ref (trash_monitor));
g_object_unref (location);
}
static void
file_changed (GFileMonitor* monitor,
GFile *child,
GFile *other_file,
GFileMonitorEvent event_type,
gpointer user_data)
{
NautilusTrashMonitor *trash_monitor;
trash_monitor = NAUTILUS_TRASH_MONITOR (user_data);
schedule_update_info (trash_monitor);
}
static void
nautilus_trash_monitor_init (NautilusTrashMonitor *trash_monitor)
{
GFile *location;
trash_monitor->details = G_TYPE_INSTANCE_GET_PRIVATE (trash_monitor,
NAUTILUS_TYPE_TRASH_MONITOR,
NautilusTrashMonitorDetails);
trash_monitor->details->empty = TRUE;
location = g_file_new_for_uri ("trash:///");
trash_monitor->details->file_monitor = g_file_monitor_file (location, 0, NULL, NULL);
g_signal_connect (trash_monitor->details->file_monitor, "changed",
(GCallback)file_changed, trash_monitor);
g_object_unref (location);
schedule_update_info (trash_monitor);
}
static void
unref_trash_monitor (void)
{
g_object_unref (nautilus_trash_monitor);
}
NautilusTrashMonitor *
nautilus_trash_monitor_get (void)
{
if (nautilus_trash_monitor == NULL) {
/* not running yet, start it up */
nautilus_trash_monitor = NAUTILUS_TRASH_MONITOR
(g_object_new (NAUTILUS_TYPE_TRASH_MONITOR, NULL));
eel_debug_call_at_shutdown (unref_trash_monitor);
}
return nautilus_trash_monitor;
}
gboolean
nautilus_trash_monitor_is_empty (void)
{
NautilusTrashMonitor *monitor;
monitor = nautilus_trash_monitor_get ();
return monitor->details->empty;
}
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