1 files changed, 270 insertions, 0 deletions
diff --git a/src/nautilus-file-undo-manager.c b/src/nautilus-file-undo-manager.c
new file mode 100644
index 0000000..f2d1eeb
--- /dev/null
+++ b/src/nautilus-file-undo-manager.c
@@ -0,0 +1,270 @@
+/* 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;
+}