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.dialogs.history.diff;
  
  import org.opencms.file.CmsObject;
  import org.opencms.file.history.CmsHistoryResourceHandler;
  import org.opencms.gwt.shared.CmsHistoryResourceBean;
  import org.opencms.main.OpenCms;
  import org.opencms.ui.A_CmsUI;
  import org.opencms.ui.CmsVaadinUtils;
  import org.opencms.ui.Messages;
  import org.opencms.ui.dialogs.history.CmsHistoryRow;
  import org.opencms.workplace.comparison.CmsHistoryListUtil;
  
  import com.google.common.base.Optional;
  import com.vaadin.ui.Alignment;
  import com.vaadin.ui.Button;
  import com.vaadin.ui.Button.ClickEvent;
  import com.vaadin.ui.Button.ClickListener;
  import com.vaadin.ui.Component;
  import com.vaadin.v7.ui.HorizontalLayout;
  import com.vaadin.ui.Panel;
  import com.vaadin.v7.ui.VerticalLayout;
  import com.vaadin.ui.themes.ValoTheme;
  
  /**
   * Provides buttons for showing the two versions being compared.<p>
   *
   */
  public class CmsShowVersionButtons implements I_CmsDiffProvider {
  
      /**
       * Creates a 'show version' button.<p>
       *
       * @param cms the CMS context to use
       * @param version the version
       *
       * @return the new button
       */
      public Button createButton(final CmsObject cms, final CmsHistoryResourceBean version) {
  
          String label = CmsVaadinUtils.getMessageText(
              Messages.GUI_HISTORY_DIALOG_SHOW_VERSION_BUTTON_1,
              CmsHistoryRow.formatVersion(version));
          Button result = new Button(label);
          result.addClickListener(new ClickListener() {
  
              private static final long serialVersionUID = 1L;
  
              public void buttonClick(ClickEvent event) {
  
                  String v1Param = version.getVersion().getVersionNumber() != null
                  ? "" + version.getVersion().getVersionNumber()
                  : "" + CmsHistoryResourceHandler.PROJECT_OFFLINE_VERSION;
                  String link = CmsHistoryListUtil.getHistoryLink(cms, version.getStructureId(), v1Param);
                  link = OpenCms.getLinkManager().substituteLinkForUnknownTarget(cms, link);
                  A_CmsUI.get().openPageOrWarn(link, "_blank");
              }
  
          });
          return result;
      }
  
      /**
       * @see org.opencms.ui.dialogs.history.diff.I_CmsDiffProvider#diff(org.opencms.file.CmsObject, org.opencms.gwt.shared.CmsHistoryResourceBean, org.opencms.gwt.shared.CmsHistoryResourceBean)
       */
      public Optional<Component> diff(CmsObject cms, CmsHistoryResourceBean v1, CmsHistoryResourceBean v2) {
  
          Panel panel = new Panel("");
          panel.addStyleName(ValoTheme.PANEL_BORDERLESS);
          HorizontalLayout hl = new HorizontalLayout();
          panel.setContent(hl);
          hl.addComponent(createButton(cms, v1));
          hl.addComponent(createButton(cms, v2));
          VerticalLayout outerContainer = new VerticalLayout();
          outerContainer.addComponent(hl);
          outerContainer.setComponentAlignment(hl, Alignment.MIDDLE_RIGHT);
          outerContainer.setMargin(true);
          hl.setSpacing(true);
          return Optional.fromNullable((Component)outerContainer);
      }
  
  }
  