content: /*
   * This library is part of OpenCms -
   * the Open Source Content Management System
   *
   * Copyright (C) Alkacon Software (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.ade.containerpage.client.ui;
  
  import org.opencms.ade.containerpage.client.ui.css.I_CmsLayoutBundle;
  import org.opencms.ade.containerpage.shared.rpc.I_CmsContainerpageServiceAsync;
  import org.opencms.gwt.client.rpc.CmsRpcAction;
  import org.opencms.gwt.client.util.CmsPositionBean;
  import org.opencms.gwt.client.util.CmsStyleVariable;
  
  import com.google.gwt.user.client.ui.RootPanel;
  import com.google.gwt.user.client.ui.Widget;
  
  /**
   * This class is responsible for managing the visibility of edit points on small elements.<p>
   */
  public class CmsSmallElementsHandler {
  
      /** The height necessary for a container page element. */
      public static int NECESSARY_HEIGHT = 24;
  
      /** The height necessary for a container page element CSS rule. */
      public static String NECESSARY_HEIGHT_RULE = NECESSARY_HEIGHT + "px !important";
  
      /** True if currently small elements are editable. */
      boolean m_editing;
  
      /** The container page service instance. */
      I_CmsContainerpageServiceAsync m_service;
  
      /** True if any small elements have been detected. */
      private boolean m_hasSmallElements;
  
      /** The style variable for the display mode for small elements. */
      private CmsStyleVariable m_smallElementsStyle;
  
      /**
       * Creates a new small elements handler.<p>
       *
       * @param service the container page service
       */
      public CmsSmallElementsHandler(I_CmsContainerpageServiceAsync service) {
  
          m_smallElementsStyle = new CmsStyleVariable(RootPanel.get());
          m_service = service;
      }
  
      /**
       * Checks if  a given widget counts as 'small'.<p>
       *
       * @param widget the widget to check
       *
       * @return  true if the widget is small
       */
      public static boolean isSmall(Widget widget) {
  
          assert widget.isAttached();
          return (CmsPositionBean.generatePositionInfo(widget.getElement()).getHeight() < NECESSARY_HEIGHT)
              && (CmsPositionBean.getBoundingClientRect(widget.getElement()).getHeight() < NECESSARY_HEIGHT);
  
      }
  
      /**
       * Returns true if currently small elements are editable.<p>
       *
       * @return true if small elements are editable
       */
      public boolean areSmallElementsEditable() {
  
          return m_editing;
      }
  
      /**
       * Returns true if any small elements are present.<p>
       *
       * @return true if any small elements are present
       */
      public boolean hasSmallElements() {
  
          return m_hasSmallElements;
      }
  
      /**
       * Prepares a small element.<p>
       *
       * @param widget the small element
       */
      public void prepareSmallElement(Widget widget) {
  
          m_hasSmallElements = true;
          widget.addStyleName(
              org.opencms.ade.containerpage.client.ui.css.I_CmsLayoutBundle.INSTANCE.containerpageCss().smallElement());
  
      }
  
      /**
       * Enables or disables editing for small elements and optionally saves the setting.<p>
       *
       * @param editable if true, enables editing for small elements
       * @param save true if the setting should be saved
       */
      public void setEditSmallElements(final boolean editable, boolean save) {
  
          if (save) {
              CmsRpcAction<Void> action = new CmsRpcAction<Void>() {
  
                  @Override
                  public void execute() {
  
                      start(200, false);
                      internalSetEditSmallElements(editable);
                      m_service.setEditSmallElements(editable, this);
  
                  }
  
                  @Override
                  protected void onResponse(Void result) {
  
                      stop(false);
                      m_editing = editable;
                  }
              };
              action.execute();
          } else {
              internalSetEditSmallElements(editable);
              m_editing = editable;
          }
      }
  
      /**
       * Sets the mode for displaying small elements.<p>
       *
       * @param editable if true, small elements will be enlarged and their edit buttons shown; if false, the edit buttons will be hidden
       */
      protected void internalSetEditSmallElements(boolean editable) {
  
          String newClass = editable
          ? I_CmsLayoutBundle.INSTANCE.containerpageCss().enlargeSmallElements()
          : I_CmsLayoutBundle.INSTANCE.containerpageCss().ignoreSmallElements();
          m_smallElementsStyle.setValue(newClass);
      }
  
  }
  