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-rw-r--r--src/nautilus-trash-monitor.c262
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diff --git a/src/nautilus-trash-monitor.c b/src/nautilus-trash-monitor.c
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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 "nautilus-trash-monitor.h"
+
+#include <eel/eel-debug.h>
+
+#define UPDATE_RATE_SECONDS 1
+
+struct _NautilusTrashMonitor
+{
+ GObject object;
+
+ gboolean empty;
+ GFileMonitor *file_monitor;
+ gboolean pending;
+ gint timeout_id;
+};
+
+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->timeout_id > 0)
+ {
+ g_source_remove (trash_monitor->timeout_id);
+ trash_monitor->timeout_id = 0;
+ }
+
+ if (trash_monitor->file_monitor)
+ {
+ g_object_unref (trash_monitor->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,
+ 0,
+ NULL, NULL,
+ g_cclosure_marshal_VOID__BOOLEAN,
+ G_TYPE_NONE, 1,
+ G_TYPE_BOOLEAN);
+}
+
+static void
+update_empty_info (NautilusTrashMonitor *trash_monitor,
+ gboolean is_empty)
+{
+ if (trash_monitor->empty == is_empty)
+ {
+ return;
+ }
+
+ trash_monitor->empty = is_empty;
+
+ /* trash got empty or full, notify everyone who cares */
+ g_signal_emit (trash_monitor,
+ signals[TRASH_STATE_CHANGED], 0,
+ trash_monitor->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);
+
+static gboolean
+schedule_update_info_cb (gpointer data)
+{
+ NautilusTrashMonitor *trash_monitor = data;
+
+ trash_monitor->timeout_id = 0;
+ if (trash_monitor->pending)
+ {
+ trash_monitor->pending = FALSE;
+ schedule_update_info (trash_monitor);
+ }
+
+ return G_SOURCE_REMOVE;
+}
+
+static void
+schedule_update_info (NautilusTrashMonitor *trash_monitor)
+{
+ GFile *location;
+
+ /* Rate limit the updates to not flood the gvfsd-trash when too many changes
+ * happended in a short time.
+ */
+ if (trash_monitor->timeout_id > 0)
+ {
+ trash_monitor->pending = TRUE;
+ return;
+ }
+
+ 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));
+
+ trash_monitor->timeout_id = g_timeout_add_seconds (UPDATE_RATE_SECONDS,
+ schedule_update_info_cb,
+ 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->empty = TRUE;
+
+ location = g_file_new_for_uri ("trash:///");
+
+ trash_monitor->file_monitor = g_file_monitor_file (location, 0, NULL, NULL);
+ trash_monitor->pending = FALSE;
+ trash_monitor->timeout_id = 0;
+
+ g_signal_connect (trash_monitor->file_monitor, "changed",
+ (GCallback) file_changed, trash_monitor);
+
+ g_object_unref (location);
+
+ schedule_update_info (trash_monitor);
+}
+
+static void
+clear_trash_monitor_on_shutdown (void)
+{
+ g_clear_object (&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 (clear_trash_monitor_on_shutdown);
+ }
+
+ return nautilus_trash_monitor;
+}
+
+gboolean
+nautilus_trash_monitor_is_empty (void)
+{
+ NautilusTrashMonitor *monitor;
+
+ monitor = nautilus_trash_monitor_get ();
+ return monitor->empty;
+}
+
+GIcon *
+nautilus_trash_monitor_get_symbolic_icon (void)
+{
+ gboolean empty;
+
+ empty = nautilus_trash_monitor_is_empty ();
+
+ if (empty)
+ {
+ return g_themed_icon_new ("user-trash-symbolic");
+ }
+ else
+ {
+ return g_themed_icon_new ("user-trash-full-symbolic");
+ }
+}