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.client;
029
030import com.google.gwt.dom.client.Document;
031import com.google.gwt.dom.client.Element;
032import com.google.gwt.dom.client.Style.Unit;
033import com.vaadin.client.ui.VMenuBar;
034
035/**
036 * Extending the VAADIN menu bar only to add a corner element pointing at the opening button.<p>
037 */
038public class CmsVMenuBar extends VMenuBar {
039
040    /** The pointy corner CSS class. */
041    protected static final String CORNER_CLASS = "o-toolbar-menu-corner";
042
043    /** The additional offset. */
044    private static final int OFFSET = -4;
045
046    /**
047     * Constructor.<p>
048     */
049    CmsVMenuBar() {
050        super();
051    }
052
053    /**
054     * Constructor.<p>
055     *
056     * @param submenu if this is a sub-menu
057     * @param parentmenu the parent menu
058     */
059    CmsVMenuBar(boolean submenu, VMenuBar parentmenu) {
060        super(submenu, parentmenu);
061    }
062
063    /**
064     * @see com.vaadin.client.ui.VMenuBar#showChildMenuAt(com.vaadin.client.ui.VMenuBar.CustomMenuItem, int, int)
065     */
066    @Override
067    protected void showChildMenuAt(CustomMenuItem item, int top, int left) {
068
069        super.showChildMenuAt(item, top, left);
070        if (!subMenu) {
071            int popupLeft = popup.getPopupLeft();
072            int dif = (left - popupLeft) + OFFSET;
073            Element corner = Document.get().createDivElement();
074            corner.setClassName(CORNER_CLASS);
075            corner.getStyle().setLeft(dif, Unit.PX);
076            popup.getElement().appendChild(corner);
077        }
078    }
079}