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 com.google.gwt.dom.client.Document;
  import com.google.gwt.dom.client.Element;
  import com.google.gwt.dom.client.Style.Unit;
  import com.google.gwt.user.client.Timer;
  import com.vaadin.client.ui.VPopupView;
  
  /**
   * Extending the VAADIN popup view only to add a corner element pointing at the opening button.<p>
   */
  public class CmsVPopupView extends VPopupView {
  
      /** The drop down marker CSS class. */
      private static final String DROP_DOWN_CLASS = "o-navigator-dropdown";
  
      /** The pointy corner CSS class. */
      private static final int OFFSET = -4;
  
      /** The corner element. */
      private Element m_corner;
  
      /**
       * @see com.vaadin.client.ui.VPopupView#center()
       */
      @Override
      public void center() {
  
          super.center();
          if (getElement().hasClassName(DROP_DOWN_CLASS)) {
              if (m_corner == null) {
                  m_corner = Document.get().createDivElement();
                  m_corner.setClassName("o-toolbar-menu-corner");
                  popup.getElement().appendChild(m_corner);
              }
              updateCornerLeft();
  
              // wait to reposition the corner, as their may be an animation effecting the position
              Timer timer = new Timer() {
  
                  @Override
                  public void run() {
  
                      updateCornerLeft();
                  }
              };
              timer.schedule(100);
          }
      }
  
      /**
       * Updates the corner element left position.<p>
       */
      void updateCornerLeft() {
  
          if (m_corner != null) {
              int popupLeft = popup.getPopupLeft();
              int dif = (getAbsoluteLeft() - popupLeft) + OFFSET;
              m_corner.getStyle().setLeft(dif, Unit.PX);
          }
      }
  }
  