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Diffstat (limited to 'libcaja-private/caja-undo-transaction.c')
| -rw-r--r-- | libcaja-private/caja-undo-transaction.c | 343 |
1 files changed, 343 insertions, 0 deletions
diff --git a/libcaja-private/caja-undo-transaction.c b/libcaja-private/caja-undo-transaction.c new file mode 100644 index 00000000..b5e1bb40 --- /dev/null +++ b/libcaja-private/caja-undo-transaction.c @@ -0,0 +1,343 @@ +/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */ + +/* CajaUndoTransaction - An object for an undoable transaction. + * Used internally by undo machinery. + * Not public. + * + * Copyright (C) 2000 Eazel, Inc. + * + * Author: Gene Z. Ragan <[email protected]> + * + * 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 <libcaja-private/caja-undo.h> +#include <libcaja-private/caja-undo-manager.h> +#include <libcaja-private/caja-undo-transaction.h> + +#include "caja-undo-private.h" +#include <gtk/gtk.h> + +#define CAJA_UNDO_TRANSACTION_LIST_DATA "Caja undo transaction list" + +/* undo atoms */ +static void undo_atom_list_free (GList *list); +static void undo_atom_list_undo_and_free (GList *list); + +G_DEFINE_TYPE (CajaUndoTransaction, caja_undo_transaction, + G_TYPE_OBJECT); + +#ifdef UIH +static Caja_Undo_MenuItem * +impl_Caja_Undo_Transaction__get_undo_menu_item (PortableServer_Servant servant, + CORBA_Environment *ev) +{ + CajaUndoTransaction *transaction; + Caja_Undo_MenuItem *item; + + transaction = CAJA_UNDO_TRANSACTION (matecomponent_object_from_servant (servant)); + + item = Caja_Undo_MenuItem__alloc (); + item->label = CORBA_string_dup (transaction->undo_menu_item_label); + item->hint = CORBA_string_dup (transaction->undo_menu_item_hint); + + return item; +} + +static Caja_Undo_MenuItem * +impl_Caja_Undo_Transaction__get_redo_menu_item (PortableServer_Servant servant, + CORBA_Environment *ev) +{ + CajaUndoTransaction *transaction; + Caja_Undo_MenuItem *item; + + transaction = CAJA_UNDO_TRANSACTION (matecomponent_object_from_servant (servant)); + + item = Caja_Undo_MenuItem__alloc (); + item->label = CORBA_string_dup (transaction->redo_menu_item_label); + item->hint = CORBA_string_dup (transaction->redo_menu_item_hint); + + return item; +} + +static CORBA_char * +impl_Caja_Undo_Transaction__get_operation_name (PortableServer_Servant servant, + CORBA_Environment *ev) +{ + CajaUndoTransaction *transaction; + + transaction = CAJA_UNDO_TRANSACTION (matecomponent_object_from_servant (servant)); + return CORBA_string_dup (transaction->operation_name); +} +#endif + + +CajaUndoTransaction * +caja_undo_transaction_new (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) +{ + CajaUndoTransaction *transaction; + + transaction = CAJA_UNDO_TRANSACTION (g_object_new (caja_undo_transaction_get_type (), NULL)); + + transaction->operation_name = g_strdup (operation_name); + transaction->undo_menu_item_label = g_strdup (undo_menu_item_label); + transaction->undo_menu_item_hint = g_strdup (undo_menu_item_hint); + transaction->redo_menu_item_label = g_strdup (redo_menu_item_label); + transaction->redo_menu_item_hint = g_strdup (redo_menu_item_hint); + + return transaction; +} + +static void +caja_undo_transaction_init (CajaUndoTransaction *transaction) +{ +} + +static void +remove_transaction_from_object (gpointer list_data, gpointer callback_data) +{ + CajaUndoAtom *atom; + CajaUndoTransaction *transaction; + GList *list; + + g_assert (list_data != NULL); + atom = list_data; + transaction = CAJA_UNDO_TRANSACTION (callback_data); + + /* Remove the transaction from the list on the atom. */ + list = g_object_get_data (atom->target, CAJA_UNDO_TRANSACTION_LIST_DATA); + + if (list != NULL) + { + list = g_list_remove (list, transaction); + g_object_set_data (atom->target, CAJA_UNDO_TRANSACTION_LIST_DATA, list); + } +} + +static void +remove_transaction_from_atom_targets (CajaUndoTransaction *transaction) +{ + + g_list_foreach (transaction->atom_list, + remove_transaction_from_object, + transaction); +} + +static void +caja_undo_transaction_finalize (GObject *object) +{ + CajaUndoTransaction *transaction; + + transaction = CAJA_UNDO_TRANSACTION (object); + + remove_transaction_from_atom_targets (transaction); + undo_atom_list_free (transaction->atom_list); + + g_free (transaction->operation_name); + g_free (transaction->undo_menu_item_label); + g_free (transaction->undo_menu_item_hint); + g_free (transaction->redo_menu_item_label); + g_free (transaction->redo_menu_item_hint); + + if (transaction->owner != NULL) + { + g_object_unref (transaction->owner); + } + + G_OBJECT_CLASS (caja_undo_transaction_parent_class)->finalize (object); +} + +void +caja_undo_transaction_add_atom (CajaUndoTransaction *transaction, + const CajaUndoAtom *atom) +{ + GList *list; + + g_return_if_fail (CAJA_IS_UNDO_TRANSACTION (transaction)); + g_return_if_fail (atom != NULL); + g_return_if_fail (GTK_IS_OBJECT (atom->target)); + + /* Add the atom to the atom list in the transaction. */ + transaction->atom_list = g_list_append + (transaction->atom_list, g_memdup (atom, sizeof (*atom))); + + /* Add the transaction to the list on the atoms target object. */ + list = g_object_get_data (atom->target, CAJA_UNDO_TRANSACTION_LIST_DATA); + if (g_list_find (list, transaction) != NULL) + { + return; + } + + /* If it's not already on that atom, this object is new. */ + list = g_list_prepend (list, transaction); + g_object_set_data (atom->target, CAJA_UNDO_TRANSACTION_LIST_DATA, list); + + /* Connect a signal handler to the atom so it will unregister + * itself when it's destroyed. + */ + g_signal_connect (atom->target, "destroy", + G_CALLBACK (caja_undo_transaction_unregister_object), + NULL); +} + +void +caja_undo_transaction_undo (CajaUndoTransaction *transaction) +{ + g_return_if_fail (CAJA_IS_UNDO_TRANSACTION (transaction)); + + remove_transaction_from_atom_targets (transaction); + undo_atom_list_undo_and_free (transaction->atom_list); + + transaction->atom_list = NULL; +} + +void +caja_undo_transaction_add_to_undo_manager (CajaUndoTransaction *transaction, + CajaUndoManager *manager) +{ + g_return_if_fail (CAJA_IS_UNDO_TRANSACTION (transaction)); + g_return_if_fail (transaction->owner == NULL); + + if (manager != NULL) + { + caja_undo_manager_append (manager, transaction); + transaction->owner = g_object_ref (manager); + } +} + +static void +remove_atoms (CajaUndoTransaction *transaction, + GObject *object) +{ + GList *p, *next; + CajaUndoAtom *atom; + + g_assert (CAJA_IS_UNDO_TRANSACTION (transaction)); + g_assert (G_IS_OBJECT (object)); + + /* Destroy any atoms for this object. */ + for (p = transaction->atom_list; p != NULL; p = next) + { + atom = p->data; + next = p->next; + + if (atom->target == object) + { + transaction->atom_list = g_list_remove_link + (transaction->atom_list, p); + undo_atom_list_free (p); + } + } + + /* If all the atoms are gone, forget this transaction. + * This may end up freeing the transaction. + */ + if (transaction->atom_list == NULL) + { + caja_undo_manager_forget ( + transaction->owner, transaction); + } +} + +static void +remove_atoms_cover (gpointer list_data, gpointer callback_data) +{ + if (CAJA_IS_UNDO_TRANSACTION (list_data)) + { + remove_atoms (CAJA_UNDO_TRANSACTION (list_data), G_OBJECT (callback_data)); + } +} + +void +caja_undo_transaction_unregister_object (GObject *object) +{ + GList *list; + + g_return_if_fail (G_IS_OBJECT (object)); + + /* Remove atoms from each transaction on the list. */ + list = g_object_get_data (object, CAJA_UNDO_TRANSACTION_LIST_DATA); + if (list != NULL) + { + g_list_foreach (list, remove_atoms_cover, object); + g_list_free (list); + g_object_set_data (object, CAJA_UNDO_TRANSACTION_LIST_DATA, NULL); + } +} + +static void +undo_atom_free (CajaUndoAtom *atom) +{ + /* Call the destroy-notify function if it's present. */ + if (atom->callback_data_destroy_notify != NULL) + { + (* atom->callback_data_destroy_notify) (atom->callback_data); + } + + /* Free the atom storage. */ + g_free (atom); +} + +static void +undo_atom_undo_and_free (CajaUndoAtom *atom) +{ + /* Call the function that does the actual undo. */ + (* atom->callback) (atom->target, atom->callback_data); + + /* Get rid of the atom now that it's spent. */ + undo_atom_free (atom); +} + +static void +undo_atom_free_cover (gpointer atom, gpointer callback_data) +{ + g_assert (atom != NULL); + g_assert (callback_data == NULL); + undo_atom_free (atom); +} + +static void +undo_atom_undo_and_free_cover (gpointer atom, gpointer callback_data) +{ + g_assert (atom != NULL); + g_assert (callback_data == NULL); + undo_atom_undo_and_free (atom); +} + +static void +undo_atom_list_free (GList *list) +{ + g_list_foreach (list, undo_atom_free_cover, NULL); + g_list_free (list); +} + +static void +undo_atom_list_undo_and_free (GList *list) +{ + g_list_foreach (list, undo_atom_undo_and_free_cover, NULL); + g_list_free (list); +} + +static void +caja_undo_transaction_class_init (CajaUndoTransactionClass *klass) +{ + G_OBJECT_CLASS (klass)->finalize = caja_undo_transaction_finalize; +} |