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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* e-history.c
*
* Copyright (C) 2002 Ximian, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author: Ettore Perazzoli <ettore@ximian.com>
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "e-history.h"
#include <gal/util/e-util.h>
#define PARENT_TYPE gtk_object_get_type ()
static GtkObjectClass *parent_class = NULL;
struct _EHistoryPrivate {
EHistoryItemFreeFunc item_free_function;
GList *items;
GList *current_item;
};
/* GtkObject methods. */
static void
impl_destroy (GtkObject *object)
{
EHistory *history;
EHistoryPrivate *priv;
GList *p;
history = E_HISTORY (object);
priv = history->priv;
for (p = priv->items; p != NULL; p = p->next)
(* priv->item_free_function) (p->data);
g_list_free (priv->items);
g_free (priv);
(* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}
static void
class_init (GtkObjectClass *object_class)
{
parent_class = gtk_type_class (PARENT_TYPE);
object_class->destroy = impl_destroy;
}
static void
init (EHistory *history)
{
EHistoryPrivate *priv;
priv = g_new (EHistoryPrivate, 1);
priv->items = NULL;
priv->current_item = NULL;
history->priv = priv;
GTK_OBJECT_UNSET_FLAGS (history, GTK_FLOATING);
}
void
e_history_construct (EHistory *history,
EHistoryItemFreeFunc item_free_function)
{
EHistoryPrivate *priv;
g_return_if_fail (history != NULL);
g_return_if_fail (E_IS_HISTORY (history));
priv = history->priv;
priv->item_free_function = item_free_function;
}
EHistory *
e_history_new (EHistoryItemFreeFunc item_free_function)
{
EHistory *history;
history = gtk_type_new (e_history_get_type ());
e_history_construct (history, item_free_function);
return history;
}
void *
e_history_prev (EHistory *history)
{
EHistoryPrivate *priv;
g_return_val_if_fail (history != NULL, NULL);
g_return_val_if_fail (E_IS_HISTORY (history), NULL);
priv = history->priv;
if (! e_history_has_prev (history))
return NULL;
priv->current_item = priv->current_item->prev;
return e_history_get_current (history);
}
gboolean
e_history_has_prev (EHistory *history)
{
EHistoryPrivate *priv;
g_return_val_if_fail (history != NULL, FALSE);
g_return_val_if_fail (E_IS_HISTORY (history), FALSE);
priv = history->priv;
if (priv->current_item == NULL)
return FALSE;
if (priv->current_item->prev == NULL)
return FALSE;
else
return TRUE;
}
void *
e_history_next (EHistory *history)
{
EHistoryPrivate *priv;
g_return_val_if_fail (history != NULL, NULL);
g_return_val_if_fail (E_IS_HISTORY (history), NULL);
priv = history->priv;
if (! e_history_has_next (history))
return NULL;
priv->current_item = priv->current_item->next;
return e_history_get_current (history);
}
gboolean
e_history_has_next (EHistory *history)
{
EHistoryPrivate *priv;
g_return_val_if_fail (history != NULL, FALSE);
g_return_val_if_fail (E_IS_HISTORY (history), FALSE);
priv = history->priv;
if (priv->current_item == NULL)
return FALSE;
if (priv->current_item->next == NULL)
return FALSE;
else
return TRUE;
}
void *
e_history_get_current (EHistory *history)
{
EHistoryPrivate *priv;
g_return_val_if_fail (history != NULL, NULL);
g_return_val_if_fail (E_IS_HISTORY (history), NULL);
priv = history->priv;
if (priv->current_item == NULL)
return NULL;
return priv->current_item->data;
}
void
e_history_add (EHistory *history,
void *data)
{
EHistoryPrivate *priv;
g_return_if_fail (history != NULL);
g_return_if_fail (E_IS_HISTORY (history));
priv = history->priv;
if (priv->current_item == NULL) {
priv->items = g_list_prepend (priv->items, data);
priv->current_item = priv->items;
return;
}
if (priv->current_item->next != NULL) {
GList *p;
for (p = priv->current_item->next; p != NULL; p = p->next)
(* priv->item_free_function) (p->data);
priv->current_item->next->prev = NULL;
g_list_free (priv->current_item->next);
priv->current_item->next = NULL;
}
g_list_append (priv->current_item, data);
priv->current_item = priv->current_item->next;
}
E_MAKE_TYPE (e_history, "EHistory", EHistory, class_init, init, GTK_TYPE_OBJECT)
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