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/*
 *  nautilus-column-provider.c - Interface for Nautilus extensions 
 *                               that provide column specifications.
 *
 *  Copyright (C) 2003 Novell, 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, see <http://www.gnu.org/licenses/>.
 * 
 *  Author:  Dave Camp <dave@ximian.com>
 *
 */

#include <config.h>
#include "nautilus-column-provider.h"

#include <glib-object.h>

/**
 * SECTION:nautilus-column-provider
 * @title: NautilusColumnProvider
 * @short_description: Interface to provide additional list view columns
 * @include: libnautilus-extension/nautilus-column-provider.h
 *
 * #NautilusColumnProvider allows extension to provide additional columns
 * in the file manager list view.
 */

static void
nautilus_column_provider_base_init (gpointer g_class)
{
}

GType                   
nautilus_column_provider_get_type (void)
{
	static GType type = 0;

	if (!type) {
		const GTypeInfo info = {
			sizeof (NautilusColumnProviderIface),
			nautilus_column_provider_base_init,
			NULL,
			NULL,
			NULL,
			NULL,
			0,
			0,
			NULL
		};
		
		type = g_type_register_static (G_TYPE_INTERFACE, 
					       "NautilusColumnProvider",
					       &info, 0);
		g_type_interface_add_prerequisite (type, G_TYPE_OBJECT);
	}

	return type;
}

/**
 * nautilus_column_provider_get_columns:
 * @provider: a #NautilusColumnProvider
 *
 * Returns: (element-type NautilusColumn) (transfer full): the provided #NautilusColumn objects
 */
GList *
nautilus_column_provider_get_columns (NautilusColumnProvider *provider)
{
	g_return_val_if_fail (NAUTILUS_IS_COLUMN_PROVIDER (provider), NULL);
	g_return_val_if_fail (NAUTILUS_COLUMN_PROVIDER_GET_IFACE (provider)->get_columns != NULL, NULL);

	return NAUTILUS_COLUMN_PROVIDER_GET_IFACE (provider)->get_columns 
		(provider);
}