Java tutorial
/* * Copyright 2000-2018 Vaadin Ltd. * * Licensed under the Apache License, Version 2.0 (the "License"); you may not * use this file except in compliance with the License. You may obtain a copy of * the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations under * the License. */ package com.vaadin.client.ui; import com.google.gwt.core.client.Scheduler; import com.google.gwt.user.client.DOM; import com.google.gwt.user.client.Event; import com.vaadin.client.BrowserInfo; /** * A image based implementation of {@link Icon}. * <p> * The image is loaded from the given URL ( {@link #setUri(String)}) and * displayed in full. * </p> * * @author Vaadin Ltd */ public class ImageIcon extends Icon { public static final String CLASSNAME = "v-icon"; public ImageIcon() { setElement(DOM.createImg()); setStyleName(CLASSNAME); } @Override public void setUri(final String imageUrl) { /* * Start sinking onload events, widgets responsibility to react. We must * do this BEFORE we set src as IE fires the event immediately if the * image is found in cache (#2592). */ sinkEvents(Event.ONLOAD); if (BrowserInfo.get().isIE()) { // apply src later for IE, to ensure onload is fired Scheduler.get().scheduleDeferred(() -> DOM.setElementProperty(getElement(), "src", imageUrl)); } DOM.setElementProperty(getElement(), "src", imageUrl); } @Override public void setAlternateText(String alternateText) { getElement().setAttribute("alt", alternateText == null ? "" : alternateText); } @Override public String getUri() { return DOM.getElementProperty(getElement(), "src"); } }