/* * 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.mail.client;import com.google.gwt.user.client.ui.Composite;import com.google.gwt.user.client.ui.StackPanel;/** * A composite that contains the shortcut stack panel on the left side. The * mailbox tree and shortcut lists don't actually do anything, but serve to show * how you can construct an interface using * {@link com.google.gwt.user.client.ui.StackPanel}, * {@link com.google.gwt.user.client.ui.Tree}, and other custom widgets. */public class Shortcuts extends Composite {  private StackPanel stackPanel = new StackPanel();  public Shortcuts() {    // Create the groups within the stack panel.    stackPanel.add(new Mailboxes(), createHeaderHTML("mailgroup.gif", "Mail"), true);    stackPanel.add(new Tasks(), createHeaderHTML("tasksgroup.gif", "Tasks"), true);    stackPanel.add(new Contacts(), createHeaderHTML("contactsgroup.gif", "Contacts"), true);    // Show the mailboxes group by default.    stackPanel.showStack(0);    initWidget(stackPanel);  }  /**   * Creates an HTML fragment that places an image & caption together, for use   * in a group header.   *    * @param imageUrl the url of the icon image to be used   * @param caption the group caption   * @return the header HTML fragment   */  private String createHeaderHTML(String imageUrl, String caption) {    return "<table align='left'><tr>" + "<td><img src='" + imageUrl + "'></td>"      + "<td style='vertical-align:middle'><b style='white-space:nowrap'>"      + caption + "</b></td>" + "</tr></table>";  }}