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Diffstat (limited to 'libnautilus-private/nautilus-undo.c')
| -rw-r--r-- | libnautilus-private/nautilus-undo.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/libnautilus-private/nautilus-undo.c b/libnautilus-private/nautilus-undo.c new file mode 100644 index 000000000..29b172b6b --- /dev/null +++ b/libnautilus-private/nautilus-undo.c @@ -0,0 +1,215 @@ +/* -*- 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); +} |