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/*
* ld-undo-action.c
*
* This file is a part of logdiag.
* Copyright Přemysl Janouch 2011. All rights reserved.
*
* See the file LICENSE for licensing information.
*
*/
#include <string.h>
#include "liblogdiag.h"
#include "config.h"
/**
* SECTION:ld-undo-action
* @short_description: An action that can be undone.
* @see_also: #LdDiagram, #LdDiagramObject
*
* #LdUndoAction represents an action that can be reverted.
*/
/*
* LdUndoActionPrivate:
* @undo_func: a callback to undo the action.
* @redo_func: a callback to redo the action.
* @destroy_func: a callback to destroy user data.
* @user_data: data given by the user.
*/
struct _LdUndoActionPrivate
{
LdUndoActionFunc undo_func;
LdUndoActionFunc redo_func;
LdUndoActionFunc destroy_func;
gpointer user_data;
};
static void ld_undo_action_finalize (GObject *gobject);
G_DEFINE_TYPE (LdUndoAction, ld_undo_action, G_TYPE_OBJECT);
static void
ld_undo_action_class_init (LdUndoActionClass *klass)
{
GObjectClass *object_class;
object_class = G_OBJECT_CLASS (klass);
object_class->finalize = ld_undo_action_finalize;
g_type_class_add_private (klass, sizeof (LdUndoActionPrivate));
}
static void
ld_undo_action_init (LdUndoAction *self)
{
self->priv = G_TYPE_INSTANCE_GET_PRIVATE
(self, LD_TYPE_UNDO_ACTION, LdUndoActionPrivate);
}
static void
ld_undo_action_finalize (GObject *gobject)
{
LdUndoAction *self;
self = LD_UNDO_ACTION (gobject);
if (self->priv->destroy_func)
self->priv->destroy_func (self->priv->user_data);
/* Chain up to the parent class. */
G_OBJECT_CLASS (ld_undo_action_parent_class)->finalize (gobject);
}
/**
* ld_undo_action_new:
* @undo_func: a callback to undo the action.
* @redo_func: a callback to redo the action.
* @destroy_func: (allow-none): a callback to destroy user data.
* @user_data: user data passed to callbacks.
*
* Return value: a new #LdUndoAction object.
*/
LdUndoAction *
ld_undo_action_new (LdUndoActionFunc undo_func,
LdUndoActionFunc redo_func, LdUndoActionFunc destroy_func,
gpointer user_data)
{
LdUndoAction *self;
g_return_val_if_fail (undo_func != NULL, NULL);
g_return_val_if_fail (redo_func != NULL, NULL);
self = g_object_new (LD_TYPE_UNDO_ACTION, NULL);
self->priv->undo_func = undo_func;
self->priv->redo_func = redo_func;
self->priv->destroy_func = destroy_func;
self->priv->user_data = user_data;
return self;
}
/**
* ld_undo_action_undo:
* @self: an #LdUndoAction object.
*
* Undo the action handled by this object.
*/
void
ld_undo_action_undo (LdUndoAction *self)
{
g_return_if_fail (LD_IS_UNDO_ACTION (self));
self->priv->undo_func (self->priv->user_data);
}
/**
* ld_undo_action_redo:
* @self: an #LdUndoAction object.
*
* Redo the action handled by this object.
*/
void
ld_undo_action_redo (LdUndoAction *self)
{
g_return_if_fail (LD_IS_UNDO_ACTION (self));
self->priv->redo_func (self->priv->user_data);
}
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