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}