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.client;
  
  import org.opencms.ui.components.CmsPanel;
  
  import com.google.gwt.user.client.Timer;
  import com.vaadin.client.ApplicationConnection;
  import com.vaadin.client.UIDL;
  import com.vaadin.client.ui.panel.PanelConnector;
  import com.vaadin.shared.ui.Connect;
  
  /**
   * Connector for the CmsPanel widget.<p>
   *
   * Contains a workaround for a glitch where the scroll position is sometimes reset after an RPC call.<p>
   */
  @Connect(CmsPanel.class)
  public class CmsPanelConnector extends PanelConnector {
  
      /** Version id. */
      private static final long serialVersionUID = 1L;
  
      /** Saved scrollTop value. */
      Integer m_scrollTop;
  
      /**
       * @see com.vaadin.client.ui.panel.PanelConnector#postLayout()
       */
      @Override
      public void postLayout() {
  
          super.postLayout();
  
          if (m_scrollTop != null) {
              final int newScrollTop = m_scrollTop.intValue();
              Timer timer = new Timer() {
  
                  @Override
                  public void run() {
  
                      getWidget().contentNode.setScrollTop(newScrollTop);
                      m_scrollTop = null;
                  }
              };
              timer.schedule(50);
          }
      }
  
      /**
       * @see com.vaadin.client.ui.panel.PanelConnector#updateFromUIDL(com.vaadin.client.UIDL, com.vaadin.client.ApplicationConnection)
       */
      @SuppressWarnings("deprecation")
      @Override
      public void updateFromUIDL(UIDL uidl, ApplicationConnection client) {
  
          super.updateFromUIDL(uidl, client);
          if (isRealUpdate(uidl)) {
              m_scrollTop = Integer.valueOf(getState().scrollTop);
          }
      }
  
  }
  