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.util; 029 030import com.google.gwt.dom.client.Element; 031import com.google.gwt.dom.client.Style; 032import com.google.gwt.dom.client.Style.Unit; 033import com.google.gwt.user.client.Command; 034 035/** 036 * Changes the elements height until the target height is reached.<p> 037 * 038 * @since 8.0.0 039 */ 040public class CmsChangeHeightAnimation extends A_CmsAnimation { 041 042 /** The element style. */ 043 private Style m_elementStyle; 044 045 /** The height of the fully visible element. */ 046 private int m_height; 047 048 /** The difference between the target height and the original height. */ 049 private int m_heightDiff; 050 051 /** The height when the animation should stop. */ 052 private int m_targetHeight; 053 054 /** 055 * Constructor.<p> 056 * 057 * @param element the element to animate 058 * @param targetHeight the height when the animation should stop 059 * @param callback the callback executed after the animation is completed 060 */ 061 public CmsChangeHeightAnimation(Element element, int targetHeight, Command callback) { 062 063 super(callback); 064 065 m_elementStyle = element.getStyle(); 066 067 m_height = CmsDomUtil.getCurrentStyleInt(element, CmsDomUtil.Style.height); 068 m_targetHeight = targetHeight; 069 m_heightDiff = m_targetHeight - m_height; 070 } 071 072 /** 073 * Slides the given element into view executing the callback afterwards.<p> 074 * 075 * @param element the element to slide in 076 * @param targetHeight the height when the animation should stop 077 * @param callback the callback executed after the animation is completed 078 * @param duration the animation duration 079 * 080 * @return the running animation object 081 */ 082 public static CmsChangeHeightAnimation change(Element element, int targetHeight, Command callback, int duration) { 083 084 CmsChangeHeightAnimation animation = new CmsChangeHeightAnimation(element, targetHeight, callback); 085 animation.run(duration); 086 return animation; 087 } 088 089 /** 090 * @see com.google.gwt.animation.client.Animation#onComplete() 091 */ 092 @Override 093 protected void onComplete() { 094 095 m_elementStyle.setHeight(m_targetHeight, Unit.PX); 096 if (m_callback != null) { 097 m_callback.execute(); 098 } 099 } 100 101 /** 102 * @see com.google.gwt.animation.client.Animation#onUpdate(double) 103 */ 104 @Override 105 protected void onUpdate(double progress) { 106 107 m_elementStyle.setHeight((m_heightDiff * progress * progress) + m_height, Unit.PX); 108 } 109}