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.gwt.client.ui;
  
  import com.google.gwt.user.client.ui.Composite;
  import com.google.gwt.user.client.ui.FlowPanel;
  import com.google.gwt.user.client.ui.Widget;
  
  /**
   * Widget which wraps another widget, which will only be appended to the DOM if the wrapper's
   * <code>widget()</code> method is called.<p>
   *
   * @param <W> the type of the widget to wrap
   *
   * @since 8.0.0
   */
  public class CmsLazyWidgetWrapper<W extends Widget> extends Composite {
  
      /** The wrapper panel. */
      private FlowPanel m_panel;
  
      /** The wrapped widget. */
      private W m_widget;
  
      /**
       * Creates a new instance.<p>
       *
       * @param widget the widget to wrap
       */
      public CmsLazyWidgetWrapper(W widget) {
  
          m_panel = new FlowPanel();
          initWidget(m_panel);
          m_widget = widget;
      }
  
      /**
       * Returns the wrapped widget and attaches it to the DOM if necessary.<p>
       *
       * @return the wrapped widget
       */
      public W widget() {
  
          if (m_widget.getParent() == null) {
              m_panel.add(m_widget);
          }
          return m_widget;
      }
  
  }
  