001/* 002 * This library is part of OpenCms - 003 * the Open Source Content Management System 004 * 005 * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com) 006 * 007 * This library is free software; you can redistribute it and/or 008 * modify it under the terms of the GNU Lesser General Public 009 * License as published by the Free Software Foundation; either 010 * version 2.1 of the License, or (at your option) any later version. 011 * 012 * This library is distributed in the hope that it will be useful, 013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 015 * Lesser General Public License for more details. 016 * 017 * For further information about Alkacon Software, please see the 018 * company website: http://www.alkacon.com 019 * 020 * For further information about OpenCms, please see the 021 * project website: http://www.opencms.org 022 * 023 * You should have received a copy of the GNU Lesser General Public 024 * License along with this library; if not, write to the Free Software 025 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 026 */ 027 028package org.opencms.ui.dialogs.history.diff; 029 030import org.opencms.file.CmsObject; 031import org.opencms.file.CmsResource; 032import org.opencms.file.history.CmsHistoryResourceHandler; 033import org.opencms.file.types.CmsResourceTypeImage; 034import org.opencms.gwt.shared.CmsHistoryResourceBean; 035import org.opencms.main.CmsException; 036import org.opencms.main.OpenCms; 037import org.opencms.util.CmsRequestUtil; 038import org.opencms.workplace.comparison.CmsHistoryListUtil; 039 040import com.google.common.base.Optional; 041import com.vaadin.server.ExternalResource; 042import com.vaadin.ui.Component; 043import com.vaadin.v7.ui.HorizontalLayout; 044import com.vaadin.ui.Image; 045import com.vaadin.ui.Panel; 046 047/** 048 * Displays two image versions side by side, scaled.<p> 049 */ 050public class CmsImageDiff implements I_CmsDiffProvider { 051 052 /** 053 * @see org.opencms.ui.dialogs.history.diff.I_CmsDiffProvider#diff(org.opencms.file.CmsObject, org.opencms.gwt.shared.CmsHistoryResourceBean, org.opencms.gwt.shared.CmsHistoryResourceBean) 054 */ 055 public Optional<Component> diff(CmsObject cms, CmsHistoryResourceBean v1, CmsHistoryResourceBean v2) 056 throws CmsException { 057 058 CmsResource r1 = A_CmsAttributeDiff.readResource(cms, v1); 059 if (OpenCms.getResourceManager().matchResourceType(CmsResourceTypeImage.getStaticTypeName(), r1.getTypeId())) { 060 HorizontalLayout hl = new HorizontalLayout(); 061 hl.setSpacing(true); 062 String v1Param = v1.getVersion().getVersionNumber() != null 063 ? "" + v1.getVersion().getVersionNumber() 064 : "" + CmsHistoryResourceHandler.PROJECT_OFFLINE_VERSION; 065 String v2Param = v2.getVersion().getVersionNumber() != null 066 ? "" + v2.getVersion().getVersionNumber() 067 : "" + CmsHistoryResourceHandler.PROJECT_OFFLINE_VERSION; 068 069 String link1 = OpenCms.getLinkManager().substituteLinkForUnknownTarget( 070 cms, 071 CmsHistoryListUtil.getHistoryLink(cms, v1.getStructureId(), v1Param)); 072 String link2 = OpenCms.getLinkManager().substituteLinkForUnknownTarget( 073 cms, 074 CmsHistoryListUtil.getHistoryLink(cms, v2.getStructureId(), v2Param)); 075 int scaleWidth = 400; 076 int scaleHeight = (2 * scaleWidth) / 3; 077 final String scaleParams = "w:" + scaleWidth + ",h:" + scaleHeight + ",t:1"; // scale type 1 for thumbnails (no enlargement) 078 link1 = CmsRequestUtil.appendParameter(link1, "__scale", scaleParams); 079 link2 = CmsRequestUtil.appendParameter(link2, "__scale", scaleParams); 080 Image img1 = new Image("", new ExternalResource(link1)); 081 Image img2 = new Image("", new ExternalResource(link2)); 082 for (Image img : new Image[] {img1, img2}) { 083 img.setWidth("" + scaleWidth + "px"); 084 } 085 img1.setCaption("V1"); 086 img2.setCaption("V2"); 087 hl.addComponent(img1); 088 hl.addComponent(img2); 089 Panel result = new Panel("Image comparison"); 090 hl.setMargin(true); 091 result.setContent(hl); 092 return Optional.fromNullable((Component)result); 093 } else { 094 return Optional.absent(); 095 } 096 097 } 098 099}