001/* 002 * This library is part of OpenCms - 003 * the Open Source Content Management System 004 * 005 * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com) 006 * 007 * This library is free software; you can redistribute it and/or 008 * modify it under the terms of the GNU Lesser General Public 009 * License as published by the Free Software Foundation; either 010 * version 2.1 of the License, or (at your option) any later version. 011 * 012 * This library is distributed in the hope that it will be useful, 013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 015 * Lesser General Public License for more details. 016 * 017 * For further information about Alkacon Software, please see the 018 * company website: http://www.alkacon.com 019 * 020 * For further information about OpenCms, please see the 021 * project website: http://www.opencms.org 022 * 023 * You should have received a copy of the GNU Lesser General Public 024 * License along with this library; if not, write to the Free Software 025 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 026 */ 027 028package org.opencms.gwt.client.ui.tree; 029 030import com.google.gwt.event.logical.shared.OpenEvent; 031import com.google.gwt.event.logical.shared.OpenHandler; 032 033/** 034 * Lazy tree open handler interface.<p> 035 * 036 * @param <I> the specific lazy tree item implementation 037 * 038 * @since 8.0.0 039 * 040 * @see org.opencms.gwt.client.ui.tree.CmsLazyTreeItem 041 */ 042public interface I_CmsLazyOpenHandler<I extends CmsLazyTreeItem> extends OpenHandler<I> { 043 044 /** 045 * Load the children of the given tree item.<p> 046 * 047 * @param target the tree item to be loaded 048 * @param callback the callback to execute after loading 049 */ 050 void load(I target, Runnable callback); 051 052 /** 053 * @see com.google.gwt.event.logical.shared.OpenHandler#onOpen(com.google.gwt.event.logical.shared.OpenEvent) 054 */ 055 void onOpen(OpenEvent<I> event); 056}