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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* nautilus-undo.c - public interface for objects that implement
* undoable actions -- works across components
*
* Copyright (C) 2000 Eazel, Inc.
*
* 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.
*
* Author: Darin Adler <darin@bentspoon.com>
*/
#include <config.h>
#include "nautilus-undo.h"
#include "nautilus-undo-private.h"
#include "nautilus-undo-transaction.h"
#include <gtk/gtksignal.h>
#include <gtk/gtkwindow.h>
#include <libgnomecanvas/gnome-canvas.h>
#define NAUTILUS_UNDO_MANAGER_DATA "Nautilus undo manager"
/* Register a simple undo action by calling nautilus_undo_register_full. */
void
nautilus_undo_register (GObject *target,
NautilusUndoCallback callback,
gpointer callback_data,
GDestroyNotify callback_data_destroy_notify,
const char *operation_name,
const char *undo_menu_item_label,
const char *undo_menu_item_hint,
const char *redo_menu_item_label,
const char *redo_menu_item_hint)
{
NautilusUndoAtom atom;
GList single_atom_list;
g_return_if_fail (G_IS_OBJECT (target));
g_return_if_fail (callback != NULL);
/* Make an atom. */
atom.target = target;
atom.callback = callback;
atom.callback_data = callback_data;
atom.callback_data_destroy_notify = callback_data_destroy_notify;
/* Make a single-atom list. */
single_atom_list.data = &atom;
single_atom_list.next = NULL;
single_atom_list.prev = NULL;
/* Call the full version of the registration function,
* using the undo target as the place to search for the
* undo manager.
*/
nautilus_undo_register_full (&single_atom_list,
target,
operation_name,
undo_menu_item_label,
undo_menu_item_hint,
redo_menu_item_label,
redo_menu_item_hint);
}
/* Register an undo action. */
void
nautilus_undo_register_full (GList *atoms,
GObject *undo_manager_search_start_object,
const char *operation_name,
const char *undo_menu_item_label,
const char *undo_menu_item_hint,
const char *redo_menu_item_label,
const char *redo_menu_item_hint)
{
NautilusUndoTransaction *transaction;
GList *p;
g_return_if_fail (atoms != NULL);
g_return_if_fail (G_IS_OBJECT (undo_manager_search_start_object));
/* Create an undo transaction */
transaction = nautilus_undo_transaction_new (operation_name,
undo_menu_item_label,
undo_menu_item_hint,
redo_menu_item_label,
redo_menu_item_hint);
for (p = atoms; p != NULL; p = p->next) {
nautilus_undo_transaction_add_atom (transaction, p->data);
}
nautilus_undo_transaction_add_to_undo_manager
(transaction,
nautilus_undo_get_undo_manager (undo_manager_search_start_object));
/* Now we are done with the transaction.
* If the undo manager is holding it, then this will not destroy it.
*/
g_object_unref (transaction);
}
/* Cover for forgetting about all undo relating to a particular target. */
void
nautilus_undo_unregister (GObject *target)
{
/* Perhaps this should also unregister all children if called on a
* GtkContainer? That might be handy.
*/
nautilus_undo_transaction_unregister_object (target);
}
void
nautilus_undo (GObject *undo_manager_search_start_object)
{
NautilusUndoManager *manager;
g_return_if_fail (G_IS_OBJECT (undo_manager_search_start_object));
manager = nautilus_undo_get_undo_manager (undo_manager_search_start_object);
if (manager != NULL) {
nautilus_undo_manager_undo (manager);
}
}
NautilusUndoManager *
nautilus_undo_get_undo_manager (GObject *start_object)
{
NautilusUndoManager *manager;
GtkWidget *parent;
GtkWindow *transient_parent;
if (start_object == NULL) {
return CORBA_OBJECT_NIL;
}
g_return_val_if_fail (G_IS_OBJECT (start_object), NULL);
/* Check for an undo manager right here. */
manager = g_object_get_data (start_object, NAUTILUS_UNDO_MANAGER_DATA);
if (manager != NULL) {
return manager;
}
/* Check for undo manager up the parent chain. */
if (GTK_IS_WIDGET (start_object)) {
parent = GTK_WIDGET (start_object)->parent;
if (parent != NULL) {
manager = nautilus_undo_get_undo_manager (G_OBJECT (parent));
if (manager != NULL) {
return manager;
}
}
/* Check for undo manager in our window's parent. */
if (GTK_IS_WINDOW (start_object)) {
transient_parent = GTK_WINDOW (start_object)->transient_parent;
if (transient_parent != NULL) {
manager = nautilus_undo_get_undo_manager (G_OBJECT (transient_parent));
if (manager != NULL) {
return manager;
}
}
}
}
/* In the case of a canvas item, try the canvas. */
if (GNOME_IS_CANVAS_ITEM (start_object)) {
manager = nautilus_undo_get_undo_manager (G_OBJECT (GNOME_CANVAS_ITEM (start_object)->canvas));
if (manager != NULL) {
return manager;
}
}
/* Found nothing. I can live with that. */
return NULL;
}
void
nautilus_undo_attach_undo_manager (GObject *object,
NautilusUndoManager *manager)
{
g_return_if_fail (G_IS_OBJECT (object));
if (manager == NULL) {
g_object_set_data (object, NAUTILUS_UNDO_MANAGER_DATA, NULL);
} else {
g_object_ref (manager);
g_object_set_data_full
(object, NAUTILUS_UNDO_MANAGER_DATA,
manager, g_object_unref);
}
}
/* Copy a reference to the undo manager fromone object to another. */
void
nautilus_undo_share_undo_manager (GObject *destination_object,
GObject *source_object)
{
NautilusUndoManager *manager;
manager = nautilus_undo_get_undo_manager (source_object);
nautilus_undo_attach_undo_manager (destination_object, manager);
}
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