Java tutorial
/* * This library is part of OpenCms - * the Open Source Content Management System * * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com) * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 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 * Lesser General Public License for more details. * * For further information about Alkacon Software, please see the * company website: http://www.alkacon.com * * For further information about OpenCms, please see the * project website: http://www.opencms.org * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ package org.opencms.ui.components.extensions; import org.opencms.ui.components.I_CmsWindowCloseListener; import org.opencms.ui.shared.rpc.I_CmsWindowCloseServerRpc; import java.util.ArrayList; import java.util.List; import com.vaadin.server.AbstractExtension; import com.vaadin.ui.UI; /** * Makes window close events available on the server side.<p> */ public class CmsWindowCloseExtension extends AbstractExtension implements I_CmsWindowCloseServerRpc { /** The serial version id. */ private static final long serialVersionUID = 3978957151754705873L; /** The registered window close listeners. */ private List<I_CmsWindowCloseListener> m_listeners; /** * Constructor.<p> * * @param ui the UI to extend */ public CmsWindowCloseExtension(UI ui) { extend(ui); registerRpc(this); m_listeners = new ArrayList<I_CmsWindowCloseListener>(); } /** * Adds a window close listener.<p> * * @param listener the listener to add */ public void addWindowCloseListener(I_CmsWindowCloseListener listener) { m_listeners.add(listener); } /** * Removes the given window close listener.<p> * * @param listener the listener to remove */ public void removeWindowCloseListener(I_CmsWindowCloseListener listener) { m_listeners.remove(listener); } /** * @see org.opencms.ui.shared.rpc.I_CmsWindowCloseServerRpc#windowClosed(java.lang.String) */ public void windowClosed(String syncToken) { for (I_CmsWindowCloseListener listener : m_listeners) { listener.onWindowClose(); } } }