/* * Copyright 2006 Google Inc. *  * 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.google.gwt.sample.kitchensink.client;import com.google.gwt.user.client.ui.ClickListener;import com.google.gwt.user.client.ui.DockPanel;import com.google.gwt.user.client.ui.Widget;import com.google.gwt.user.client.ui.HTML;import com.google.gwt.user.client.ui.Image;import com.google.gwt.user.client.ui.LoadListener;import com.google.gwt.user.client.ui.VerticalPanel;/** * Demonstrates {@link com.google.gwt.user.client.ui.Image}. */public class Images extends Sink implements ClickListener, LoadListener {  private static final String[] sImages = new String[]{    "rembrandt/JohannesElison.jpg", "rembrandt/LaMarcheNocturne.jpg",    "rembrandt/SelfPortrait1628.jpg", "rembrandt/SelfPortrait1640.jpg",    "rembrandt/TheArtistInHisStudio.jpg",    "rembrandt/TheReturnOfTheProdigalSon.jpg"};  public static SinkInfo init() {    return new SinkInfo("Images",      "This page demonstrates GWT's support for images.  Notice in "        + "particular how it uses the image's onLoad event to display a 'wait "        + "spinner' between the back and forward buttons.") {      public Sink createInstance() {        return new Images();      }    };  }  private int curImage;  private Image image = new Image();  private Image loadingImage = new Image("images/blanksearching.gif");  private Image nextButton = new Image("rembrandt/forward.gif");  private Image prevButton = new Image("rembrandt/back.gif");  public Images() {    image.addLoadListener(this);    prevButton.addClickListener(this);    nextButton.addClickListener(this);    DockPanel topPanel = new DockPanel();    topPanel.setVerticalAlignment(DockPanel.ALIGN_MIDDLE);    topPanel.add(prevButton, DockPanel.WEST);    topPanel.add(nextButton, DockPanel.EAST);    topPanel.add(loadingImage, DockPanel.CENTER);    VerticalPanel panel = new VerticalPanel();    panel.setHorizontalAlignment(VerticalPanel.ALIGN_CENTER);    panel      .add(new HTML("<h2>A Bit of Rembrandt</h2>", true));    panel.add(topPanel);    panel.add(image);    panel.setWidth("100%");    setWidget(panel);    image.setStyleName("ks-images-Image");    nextButton.setStyleName("ks-images-Button");    prevButton.setStyleName("ks-images-Button");    loadImage(0);  }  public void onClick(Widget sender) {    if (sender == prevButton)      loadImage(curImage - 1);    else if (sender == nextButton)      loadImage(curImage + 1);  }  public void onError(Widget sender) {  }  public void onLoad(Widget sender) {    loadingImage.setUrl("images/blanksearching.gif");  }  public void onShow() {  }  private void loadImage(int index) {    if (index < 0)      index = sImages.length - 1;    else if (index > sImages.length - 1)      index = 0;    curImage = index;    loadingImage.setUrl("images/searching.gif");    image.setUrl(sImages[curImage]);  }}