/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * 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.
 */
#include <stdio.h>
#include "gimpsignal.h"
#include "gimplistP.h"

/* code mostly ripped from nether's gimpset class  */

enum
{
  ADD,
  REMOVE,
  LAST_SIGNAL
};

static guint gimp_list_signals [LAST_SIGNAL];

static GimpObjectClass* parent_class;

static void gimp_list_add_func(GimpList *list, void *);
static void gimp_list_remove_func(GimpList *list, void *);

static void
gimp_list_destroy (GtkObject* ob)
{
	GimpList* list=GIMP_LIST(ob);
	while(list->list) /* ought to put a sanity check in here... */
	{
	  gimp_list_remove(list, list->list->data);
	}
	g_slist_free(list->list);
	GTK_OBJECT_CLASS(parent_class)->destroy (ob);
}

static void
gimp_list_init (GimpList* list)
{
	list->list=NULL;
	list->type=GTK_TYPE_OBJECT;
}

static void
gimp_list_class_init (GimpListClass* klass)
{
	GtkObjectClass *object_class = GTK_OBJECT_CLASS (klass);
	GtkType type = object_class->type;

	parent_class=gtk_type_parent_class(type);
	
	object_class->destroy = gimp_list_destroy;
	
	gimp_list_signals[ADD]=
	  gimp_signal_new ("add", GTK_RUN_FIRST, type, 0,
			   gimp_sigtype_pointer);
	gimp_list_signals[REMOVE]=
	  gimp_signal_new ("remove", GTK_RUN_FIRST, type, 0,
			   gimp_sigtype_pointer);
	gtk_object_class_add_signals (object_class,
				      gimp_list_signals,
				      LAST_SIGNAL);

	klass->add    = gimp_list_add_func;
	klass->remove = gimp_list_remove_func;
}

GtkType gimp_list_get_type (void)
{
	static GtkType type;
	GIMP_TYPE_INIT(type,
		       GimpList,
		       GimpListClass,
		       gimp_list_init,
		       gimp_list_class_init,
		       GIMP_TYPE_OBJECT);
	return type;
}


GimpList*
gimp_list_new (GtkType type, gboolean weak){
	GimpList* list=gtk_type_new (gimp_list_get_type ());
	list->type=type;
	list->weak=weak;
	return list;
}

static void
gimp_list_destroy_cb (GtkObject* ob, gpointer data){
	GimpList* list=GIMP_LIST(data);
	gimp_list_remove(list, ob);
}

static void
gimp_list_add_func(GimpList* list, gpointer val)
{
  list->list=g_slist_prepend(list->list, val);
}

static void
gimp_list_remove_func(GimpList* list, gpointer val)
{
  list->list=g_slist_remove(list->list, val);
}

gboolean
gimp_list_add (GimpList* list, gpointer val)
{
  g_return_val_if_fail(list, FALSE);
  g_return_val_if_fail(GTK_CHECK_TYPE(val, list->type), FALSE);
	
  if(g_slist_find(list->list, val))
    return FALSE;
	
  if(list->weak)
    gtk_signal_connect(GTK_OBJECT(val), "destroy",
		       GTK_SIGNAL_FUNC(gimp_list_destroy_cb), list);
  else
    gtk_object_ref(GTK_OBJECT(val));
	
  GIMP_LIST_CLASS(GTK_OBJECT(list)->klass)->add(list, val);

  gtk_signal_emit (GTK_OBJECT(list), gimp_list_signals[ADD], val);
  return TRUE;
}

gboolean
gimp_list_remove (GimpList* list, gpointer val)
{
	g_return_val_if_fail(list, FALSE);

	if(!g_slist_find(list->list, val))
	{
	  fprintf (stderr, "gimp_list_remove: can't find val\n");
	  return FALSE;
	}
	GIMP_LIST_CLASS(GTK_OBJECT(list)->klass)->remove(list, val);

	gtk_signal_emit (GTK_OBJECT(list), gimp_list_signals[REMOVE], val);

	if(list->weak)
		gtk_signal_disconnect_by_func
			(GTK_OBJECT(val),
			 GTK_SIGNAL_FUNC(gimp_list_destroy_cb),
			 list);
	else
		gtk_object_unref(GTK_OBJECT(val));

	return TRUE;
}

gboolean
gimp_list_have (GimpList* list, gpointer val) {
	return g_slist_find(list->list, val)?TRUE:FALSE;
}

void
gimp_list_foreach(GimpList* list, GFunc func, gpointer user_data)
{
	g_slist_foreach(list->list, func, user_data);
}

GtkType
gimp_list_type (GimpList* list){
	return list->type;
}