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.Unit;
032import com.google.gwt.user.client.Command;
033
034/**
035 * Move animation. Moving the given element from it's start to it's end position
036 * and executing the given call-back on complete.<p>
037 *
038 * @since 8.0.0
039 */
040public class CmsMoveAnimation extends A_CmsAnimation {
041
042    /** The element. */
043    private Element m_element;
044
045    /** The end left. */
046    private int m_endLeft;
047
048    /** The end top. */
049    private int m_endTop;
050
051    /** The start left. */
052    private int m_startLeft;
053
054    /** The start top. */
055    private int m_startTop;
056
057    /**
058     * Constructor. Setting the element to animate, it's start and end position.<p>
059     *
060     * @param element the element
061     * @param startTop the start top
062     * @param startLeft the start left
063     * @param endTop the end top
064     * @param endLeft the end left
065     * @param callback the call-back to execute on complete
066     */
067    public CmsMoveAnimation(Element element, int startTop, int startLeft, int endTop, int endLeft, Command callback) {
068
069        super(callback);
070        m_element = element;
071        m_startTop = startTop;
072        m_startLeft = startLeft;
073        m_endTop = endTop;
074        m_endLeft = endLeft;
075    }
076
077    /**
078     * @see com.google.gwt.animation.client.Animation#onUpdate(double)
079     */
080    @Override
081    protected void onUpdate(double progress) {
082
083        progress = progress * progress;
084        double newTop = m_startTop + ((m_endTop - m_startTop) * progress);
085        double newLeft = m_startLeft + ((m_endLeft - m_startLeft) * progress);
086        m_element.getStyle().setTop(newTop, Unit.PX);
087        m_element.getStyle().setLeft(newLeft, Unit.PX);
088    }
089}