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.js;
029
030import elemental2.core.JsArray;
031import jsinterop.annotations.JsFunction;
032import jsinterop.annotations.JsType;
033import jsinterop.base.JsPropertyMap;
034
035/**
036 * JS interop class for native ResizeObserver.
037 */
038@JsType(isNative = true, name = "ResizeObserver", namespace = "<window>")
039public class ResizeObserver {
040
041    /**
042     * JS Callback for resize observers.
043     */
044    @JsFunction
045    public interface Callback {
046
047        /**
048         * Called by the resize observer.
049         *
050         * @param entries the resize observer entries
051         */
052        void call(JsArray<JsPropertyMap<?>> entries);
053    }
054
055    /**
056     * Creates a new instance.
057     *
058     * @param callback the callback to call when resizes happen
059     */
060    public ResizeObserver(Callback callback) {
061
062        super();
063    }
064
065    /**
066     * Disconnects the resize observer.
067     */
068    public native void disconnect();
069
070    /**
071     * Starts observation for an element.
072     *
073     * @param element the element to observer
074     */
075    public native void observe(elemental2.dom.Element element);
076
077    /**
078     * Stops observation for an element.
079     *
080     * @param element the element for which to stop observation
081     */
082    public native void unobserve(elemental2.dom.Element element);
083
084}