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