moving from https://github.com/perberos/mate-desktop-environment

1 files changed, 218 insertions, 0 deletions

diff --git a/libcaja-private/caja-undo.c b/libcaja-private/caja-undo.c
new file mode 100644
index 00000000..6dc5a029
--- /dev/null
+++ b/libcaja-private/caja-undo.c
@@ -0,0 +1,218 @@
+/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
+
+/* caja-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 <[email protected]>
+ */
+
+#include <config.h>
+#include "caja-undo.h"
+
+#include "caja-undo-private.h"
+#include "caja-undo-transaction.h"
+#include <gtk/gtk.h>
+
+#define CAJA_UNDO_MANAGER_DATA "Caja undo manager"
+
+/* Register a simple undo action by calling caja_undo_register_full. */
+void
+caja_undo_register (GObject *target,
+                    CajaUndoCallback 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)
+{
+    CajaUndoAtom 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.
+     */
+    caja_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
+caja_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)
+{
+    CajaUndoTransaction *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 = caja_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)
+    {
+        caja_undo_transaction_add_atom (transaction, p->data);
+    }
+    caja_undo_transaction_add_to_undo_manager
+    (transaction,
+     caja_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
+caja_undo_unregister (GObject *target)
+{
+    /* Perhaps this should also unregister all children if called on a
+     * GtkContainer? That might be handy.
+     */
+    caja_undo_transaction_unregister_object (target);
+}
+
+void
+caja_undo (GObject *undo_manager_search_start_object)
+{
+    CajaUndoManager *manager;
+
+    g_return_if_fail (G_IS_OBJECT (undo_manager_search_start_object));
+
+    manager = caja_undo_get_undo_manager (undo_manager_search_start_object);
+    if (manager != NULL)
+    {
+        caja_undo_manager_undo (manager);
+    }
+}
+
+CajaUndoManager *
+caja_undo_get_undo_manager (GObject *start_object)
+{
+    CajaUndoManager *manager;
+    GtkWidget *parent;
+    GtkWindow *transient_parent;
+
+    if (start_object == NULL)
+    {
+        return NULL;
+    }
+
+    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, CAJA_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_get_parent (GTK_WIDGET (start_object));
+        if (parent != NULL)
+        {
+            manager = caja_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_get_transient_for (GTK_WINDOW (start_object));
+            if (transient_parent != NULL)
+            {
+                manager = caja_undo_get_undo_manager (G_OBJECT (transient_parent));
+                if (manager != NULL)
+                {
+                    return manager;
+                }
+            }
+        }
+    }
+
+    /* Found nothing. I can live with that. */
+    return NULL;
+}
+
+void
+caja_undo_attach_undo_manager (GObject *object,
+                               CajaUndoManager *manager)
+{
+    g_return_if_fail (G_IS_OBJECT (object));
+
+    if (manager == NULL)
+    {
+        g_object_set_data (object, CAJA_UNDO_MANAGER_DATA, NULL);
+    }
+    else
+    {
+        g_object_ref (manager);
+        g_object_set_data_full
+        (object, CAJA_UNDO_MANAGER_DATA,
+         manager, g_object_unref);
+    }
+}
+
+/* Copy a reference to the undo manager fromone object to another. */
+void
+caja_undo_share_undo_manager (GObject *destination_object,
+                              GObject *source_object)
+{
+    CajaUndoManager *manager;
+
+    manager = caja_undo_get_undo_manager (source_object);
+    caja_undo_attach_undo_manager (destination_object, manager);
+}