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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* NautilusUndoable - A container for an undoable object .
*
* Copyright (C) 2000 Eazel, Inc.
*
* Author: Gene Z. Ragan <gzr@eazel.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <config.h>
#include "nautilus-undoable.h"
#include <gtk/gtksignal.h>
#include <gtk/gtkmain.h>
#include <glib.h>
#include <libnautilus-extensions/nautilus-gnome-extensions.h>
#include <libnautilus-extensions/nautilus-gtk-extensions.h>
#include <libnautilus-extensions/nautilus-gtk-macros.h>
#include "nautilus-undo-manager.h"
enum {
SAVE_UNDO_SNAPSHOT,
RESTORE_FROM_UNDO_SNAPSHOT,
LAST_SIGNAL
};
static guint signals[LAST_SIGNAL];
/* GtkObject */
static void nautilus_undoable_initialize_class (NautilusUndoableClass *class);
static void nautilus_undoable_initialize (NautilusUndoable *item);
static void destroy (GtkObject *object);
NAUTILUS_DEFINE_CLASS_BOILERPLATE (NautilusUndoable, nautilus_undoable, GTK_TYPE_OBJECT)
/* Class initialization function for the NautilusUndoable item. */
static void
nautilus_undoable_initialize_class (NautilusUndoableClass *class)
{
GtkObjectClass *object_class;
object_class = GTK_OBJECT_CLASS (class);
object_class->destroy = destroy;
signals[SAVE_UNDO_SNAPSHOT]
= gtk_signal_new ("save_undo_snapshot",
GTK_RUN_LAST,
object_class->type,
GTK_SIGNAL_OFFSET (NautilusUndoableClass,
save_undo_snapshot),
gtk_marshal_NONE__POINTER,
GTK_TYPE_NONE, 1,
GTK_TYPE_POINTER);
signals[RESTORE_FROM_UNDO_SNAPSHOT]
= gtk_signal_new ("restore_from_undo_snapshot",
GTK_RUN_LAST,
object_class->type,
GTK_SIGNAL_OFFSET (NautilusUndoableClass,
restore_from_undo_snapshot),
gtk_marshal_NONE__POINTER,
GTK_TYPE_NONE, 1,
GTK_TYPE_POINTER);
gtk_object_class_add_signals (object_class, signals, LAST_SIGNAL);
}
/* Object initialization function for the NautilusUndoable. */
static void
nautilus_undoable_initialize (NautilusUndoable *undoable)
{
g_datalist_init(&undoable->undo_data);
}
GtkObject *
nautilus_undoable_new (void)
{
GtkObject *new;
new = gtk_type_new (nautilus_undoable_get_type ());
return new;
}
/* destroy */
static void
destroy (GtkObject *object)
{
NautilusUndoable *undoable;
g_return_if_fail (NAUTILUS_IS_UNDOABLE (object));
undoable = NAUTILUS_UNDOABLE(object);
g_datalist_clear(&undoable->undo_data);
NAUTILUS_CALL_PARENT_CLASS (GTK_OBJECT_CLASS, destroy, (object));
}
/* nautilus_undoable_save_undo_snapshot */
void
nautilus_undoable_save_undo_snapshot (GtkObject *target, GtkSignalFunc save_func, GtkSignalFunc restore_func)
{
gboolean result;
NautilusUndoable *undoable;
/* Init Undoable */
undoable = NAUTILUS_UNDOABLE(nautilus_undoable_new());
/* Set target */
undoable->undo_target_class = target;
/* Connect signals to target object */
gtk_signal_connect_while_alive (GTK_OBJECT (undoable), "save_undo_snapshot", save_func, target, target);
gtk_signal_connect_while_alive (GTK_OBJECT (undoable), "restore_from_undo_snapshot", restore_func, target, target);
/* Add undoable to current transaction */
result = nautilus_undo_manager_add_undoable_to_transaction (undoable);
/* Fire SAVE_UNDO_SNAPSHOT signal */
gtk_signal_emit (GTK_OBJECT (undoable),
signals[SAVE_UNDO_SNAPSHOT],
undoable);
}
/* nautilus_undoable_restore_from_undo_snapshot */
void
nautilus_undoable_restore_from_undo_snapshot (NautilusUndoable *undoable)
{
gtk_signal_emit (GTK_OBJECT (undoable),
signals[RESTORE_FROM_UNDO_SNAPSHOT],
undoable);
}
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