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-rw-r--r--src/nautilus-file-undo-manager.c270
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diff --git a/src/nautilus-file-undo-manager.c b/src/nautilus-file-undo-manager.c
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+/* nautilus-file-undo-manager.c - Manages the undo/redo stack
+ *
+ * Copyright (C) 2007-2011 Amos Brocco
+ * Copyright (C) 2010, 2012 Red Hat, Inc.
+ *
+ * This library 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 library 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 library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Amos Brocco <amos.brocco@gmail.com>
+ * Cosimo Cecchi <cosimoc@redhat.com>
+ *
+ */
+
+#include <config.h>
+
+#include "nautilus-file-undo-manager.h"
+
+#include "nautilus-file-operations.h"
+#include "nautilus-file.h"
+#include "nautilus-trash-monitor.h"
+
+#include <glib/gi18n.h>
+
+#define DEBUG_FLAG NAUTILUS_DEBUG_UNDO
+#include "nautilus-debug.h"
+
+enum
+{
+ SIGNAL_UNDO_CHANGED,
+ NUM_SIGNALS,
+};
+
+static guint signals[NUM_SIGNALS] = { 0, };
+
+struct _NautilusFileUndoManager
+{
+ GObject parent_instance;
+ NautilusFileUndoInfo *info;
+ NautilusFileUndoManagerState state;
+ NautilusFileUndoManagerState last_state;
+
+ guint is_operating : 1;
+
+ gulong trash_signal_id;
+};
+
+G_DEFINE_TYPE (NautilusFileUndoManager, nautilus_file_undo_manager, G_TYPE_OBJECT)
+
+static NautilusFileUndoManager *undo_singleton = NULL;
+
+NautilusFileUndoManager *
+nautilus_file_undo_manager_new (void)
+{
+ if (undo_singleton != NULL)
+ {
+ return g_object_ref (undo_singleton);
+ }
+
+ undo_singleton = g_object_new (NAUTILUS_TYPE_FILE_UNDO_MANAGER, NULL);
+ g_object_add_weak_pointer (G_OBJECT (undo_singleton), (gpointer) & undo_singleton);
+
+ return undo_singleton;
+}
+
+static void
+file_undo_manager_clear (NautilusFileUndoManager *self)
+{
+ g_clear_object (&self->info);
+ self->state = NAUTILUS_FILE_UNDO_MANAGER_STATE_NONE;
+}
+
+static void
+trash_state_changed_cb (NautilusTrashMonitor *monitor,
+ gboolean is_empty,
+ gpointer user_data)
+{
+ NautilusFileUndoManager *self = user_data;
+
+ /* A trash operation cannot be undone if the trash is empty */
+ if (is_empty &&
+ self->state == NAUTILUS_FILE_UNDO_MANAGER_STATE_UNDO &&
+ NAUTILUS_IS_FILE_UNDO_INFO_TRASH (self->info))
+ {
+ file_undo_manager_clear (self);
+ g_signal_emit (self, signals[SIGNAL_UNDO_CHANGED], 0);
+ }
+}
+
+static void
+nautilus_file_undo_manager_init (NautilusFileUndoManager *self)
+{
+ self->trash_signal_id = g_signal_connect (nautilus_trash_monitor_get (),
+ "trash-state-changed",
+ G_CALLBACK (trash_state_changed_cb), self);
+}
+
+static void
+nautilus_file_undo_manager_finalize (GObject *object)
+{
+ NautilusFileUndoManager *self = NAUTILUS_FILE_UNDO_MANAGER (object);
+
+ g_clear_signal_handler (&self->trash_signal_id, nautilus_trash_monitor_get ());
+
+ file_undo_manager_clear (self);
+
+ G_OBJECT_CLASS (nautilus_file_undo_manager_parent_class)->finalize (object);
+}
+
+static void
+nautilus_file_undo_manager_class_init (NautilusFileUndoManagerClass *klass)
+{
+ GObjectClass *oclass;
+
+ oclass = G_OBJECT_CLASS (klass);
+
+ oclass->finalize = nautilus_file_undo_manager_finalize;
+
+ signals[SIGNAL_UNDO_CHANGED] =
+ g_signal_new ("undo-changed",
+ G_TYPE_FROM_CLASS (klass),
+ G_SIGNAL_RUN_LAST,
+ 0, NULL, NULL,
+ g_cclosure_marshal_VOID__VOID,
+ G_TYPE_NONE, 0);
+}
+
+static void
+undo_info_apply_ready (GObject *source,
+ GAsyncResult *res,
+ gpointer user_data)
+{
+ NautilusFileUndoManager *self = user_data;
+ NautilusFileUndoInfo *info = NAUTILUS_FILE_UNDO_INFO (source);
+ gboolean success, user_cancel;
+
+ success = nautilus_file_undo_info_apply_finish (info, res, &user_cancel, NULL);
+
+ self->is_operating = FALSE;
+
+ /* just return in case we got another another operation set */
+ if ((self->info != NULL) &&
+ (self->info != info))
+ {
+ return;
+ }
+
+ if (success)
+ {
+ if (self->last_state == NAUTILUS_FILE_UNDO_MANAGER_STATE_UNDO)
+ {
+ self->state = NAUTILUS_FILE_UNDO_MANAGER_STATE_REDO;
+ }
+ else if (self->last_state == NAUTILUS_FILE_UNDO_MANAGER_STATE_REDO)
+ {
+ self->state = NAUTILUS_FILE_UNDO_MANAGER_STATE_UNDO;
+ }
+
+ self->info = g_object_ref (info);
+ }
+ else if (user_cancel)
+ {
+ self->state = self->last_state;
+ self->info = g_object_ref (info);
+ }
+ else
+ {
+ file_undo_manager_clear (self);
+ }
+
+ g_signal_emit (self, signals[SIGNAL_UNDO_CHANGED], 0);
+}
+
+static void
+do_undo_redo (NautilusFileUndoManager *self,
+ GtkWindow *parent_window,
+ NautilusFileOperationsDBusData *dbus_data)
+{
+ gboolean undo = self->state == NAUTILUS_FILE_UNDO_MANAGER_STATE_UNDO;
+
+ self->last_state = self->state;
+
+ self->is_operating = TRUE;
+ nautilus_file_undo_info_apply_async (self->info, undo, parent_window,
+ dbus_data,
+ undo_info_apply_ready, self);
+
+ /* clear actions while undoing */
+ file_undo_manager_clear (self);
+ g_signal_emit (self, signals[SIGNAL_UNDO_CHANGED], 0);
+}
+
+void
+nautilus_file_undo_manager_redo (GtkWindow *parent_window,
+ NautilusFileOperationsDBusData *dbus_data)
+{
+ if (undo_singleton->state != NAUTILUS_FILE_UNDO_MANAGER_STATE_REDO)
+ {
+ g_warning ("Called redo, but state is %s!", undo_singleton->state == 0 ?
+ "none" : "undo");
+ return;
+ }
+
+ do_undo_redo (undo_singleton, parent_window, dbus_data);
+}
+
+void
+nautilus_file_undo_manager_undo (GtkWindow *parent_window,
+ NautilusFileOperationsDBusData *dbus_data)
+{
+ if (undo_singleton->state != NAUTILUS_FILE_UNDO_MANAGER_STATE_UNDO)
+ {
+ g_warning ("Called undo, but state is %s!", undo_singleton->state == 0 ?
+ "none" : "redo");
+ return;
+ }
+
+ do_undo_redo (undo_singleton, parent_window, dbus_data);
+}
+
+void
+nautilus_file_undo_manager_set_action (NautilusFileUndoInfo *info)
+{
+ DEBUG ("Setting undo information %p", info);
+
+ file_undo_manager_clear (undo_singleton);
+
+ if (info != NULL)
+ {
+ undo_singleton->info = g_object_ref (info);
+ undo_singleton->state = NAUTILUS_FILE_UNDO_MANAGER_STATE_UNDO;
+ undo_singleton->last_state = NAUTILUS_FILE_UNDO_MANAGER_STATE_NONE;
+ }
+
+ g_signal_emit (undo_singleton, signals[SIGNAL_UNDO_CHANGED], 0);
+}
+
+NautilusFileUndoInfo *
+nautilus_file_undo_manager_get_action (void)
+{
+ return undo_singleton->info;
+}
+
+NautilusFileUndoManagerState
+nautilus_file_undo_manager_get_state (void)
+{
+ return undo_singleton->state;
+}
+
+
+gboolean
+nautilus_file_undo_manager_is_operating (void)
+{
+ return undo_singleton->is_operating;
+}
+
+NautilusFileUndoManager *
+nautilus_file_undo_manager_get (void)
+{
+ return undo_singleton;
+}