content: /*
   * This library is part of OpenCms -
   * the Open Source Content Management System
   *
   * Copyright (c) Alkacon Software GmbH & Co. KG (https://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: https://www.alkacon.com
   *
   * For further information about OpenCms, please see the
   * project website: https://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();
          }
      }
  }
  