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.gwt.client.ui.input; 029 030import org.opencms.gwt.client.util.CmsDomUtil; 031import org.opencms.gwt.client.util.CmsTextMetrics; 032import org.opencms.util.CmsStringUtil; 033 034import com.google.gwt.dom.client.Element; 035 036/** 037 * Single line label implementation that acts like doing CSS 'text-overflow:ellipsis;', but cutting text on the left-hand side.<p> 038 * 039 * @since 8.0.0 040 */ 041public class CmsLabelLeftTruncating extends CmsLabel { 042 043 /** 044 * Creates an empty label.<p> 045 */ 046 public CmsLabelLeftTruncating() { 047 048 super(); 049 } 050 051 /** 052 * Creates an empty label using the given element.<p> 053 * 054 * @param element the element to use 055 */ 056 public CmsLabelLeftTruncating(Element element) { 057 058 super(element); 059 } 060 061 /** 062 * Creates a label with the specified text.<p> 063 * 064 * @param text the new label's text 065 */ 066 public CmsLabelLeftTruncating(String text) { 067 068 super(text); 069 } 070 071 /** 072 * @see org.opencms.gwt.client.ui.I_CmsTruncable#truncate(java.lang.String, int) 073 */ 074 @Override 075 public void truncate(String textMetricsKey, int labelWidth) { 076 077 super.setText(m_originalText); 078 079 // measure the actual text width 080 Element element = getElement(); 081 CmsTextMetrics tm = CmsTextMetrics.get(element, textMetricsKey); 082 String text = element.getInnerText(); 083 int textWidth = tm.getWidth(text); 084 tm.release(); 085 086 if (labelWidth >= textWidth) { 087 updateTitle(false); 088 return; 089 } 090 updateTitle(true); 091 092 text = (new StringBuilder(text)).reverse().toString(); 093 // if the text does not have enough space, fix it 094 int maxChars = (int)(((float)labelWidth / (float)textWidth) * text.length()); 095 if (maxChars < 1) { 096 maxChars = 1; 097 } 098 text = text.substring(0, maxChars - 1); 099 if (CmsStringUtil.isEmptyOrWhitespaceOnly(text)) { 100 // if empty, it could break the layout 101 text = CmsDomUtil.Entity.nbsp.html(); 102 } 103 // text = CmsClientStringUtil.shortenString(text, maxChars); 104 text = (new StringBuilder(text)).reverse().toString(); 105 if (maxChars > 2) { 106 // enough space for ellipsis? 107 text = CmsDomUtil.Entity.hellip.html() + text; 108 } 109 // use html instead of text because of the entities 110 setHTML(text); 111 } 112 113}