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.shared.components.CmsScrollPositionCssState;
  
  import com.vaadin.server.AbstractExtension;
  import com.vaadin.ui.AbstractComponent;
  import com.vaadin.ui.AbstractSingleComponentContainer;
  
  /**
   * Extension to add a CSS class to any component depending on it's scroll position.<p>
   */
  public class CmsScrollPositionCss extends AbstractExtension {
  
      /** The serial version id. */
      private static final long serialVersionUID = 3382283389411937891L;
  
      /**
       * Constructor.<p>
       *
       * @param componentContainer the component to extend
       * @param scrollBarrier the scroll barrier
       * @param barrierMargin the margin
       * @param styleName the style name to set beyond the scroll barrier
       */
      public CmsScrollPositionCss(
          AbstractComponent componentContainer,
          int scrollBarrier,
          int barrierMargin,
          String styleName) {
          super.extend(componentContainer);
          getState().setScrollBarrier(scrollBarrier);
          getState().setBarrierMargin(barrierMargin);
          getState().setStyleName(styleName);
      }
  
      /**
       * Adds the scroll position CSS extension to the given component
       *
       * @param componentContainer the component to extend
       * @param scrollBarrier the scroll barrier
       * @param barrierMargin the margin
       * @param styleName the style name to set beyond the scroll barrier
       */
      @SuppressWarnings("unused")
      public static void addTo(
          AbstractSingleComponentContainer componentContainer,
          int scrollBarrier,
          int barrierMargin,
          String styleName) {
  
          new CmsScrollPositionCss(componentContainer, scrollBarrier, barrierMargin, styleName);
      }
  
      /**
       * @see com.vaadin.server.AbstractClientConnector#getState()
       */
      @Override
      protected CmsScrollPositionCssState getState() {
  
          return (CmsScrollPositionCssState)super.getState();
      }
  
  }
  