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; 031 032/** 033 * Two levels deep lazy list tree open handler abstract implementation.<p> 034 * 035 * @param <I> the specific lazy tree item implementation 036 * 037 * @since 8.0.0 038 * 039 * @see org.opencms.gwt.client.ui.tree.CmsLazyTree 040 * @see org.opencms.gwt.client.ui.tree.CmsLazyTreeItem 041 * @see org.opencms.gwt.client.ui.tree.I_CmsLazyOpenHandler 042 */ 043public abstract class A_CmsDeepLazyOpenHandler<I extends CmsLazyTreeItem> extends A_CmsLazyOpenHandler<I> { 044 045 /** 046 * @see org.opencms.gwt.client.ui.tree.I_CmsLazyOpenHandler#onOpen(com.google.gwt.event.logical.shared.OpenEvent) 047 */ 048 @Override 049 @SuppressWarnings("unchecked") 050 public void onOpen(OpenEvent<I> event) { 051 052 I target = event.getTarget(); 053 if (target.getLoadState() == CmsLazyTreeItem.LoadState.UNLOADED) { 054 // in case the first level is not yet loaded 055 super.onOpen(event); 056 } else if (target.getChildCount() > 0) { 057 // load second level 058 int c = target.getChildCount(); 059 for (int i = 0; i < c; i++) { 060 I child = (I)target.getChild(i); 061 if (child.getLoadState() != CmsLazyTreeItem.LoadState.UNLOADED) { 062 continue; 063 } 064 child.onStartLoading(); 065 child.setOpen(false); 066 load(child, null); 067 } 068 } 069 } 070}