/* * 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.ChangeListener;import com.google.gwt.user.client.ui.HorizontalPanel;import com.google.gwt.user.client.ui.Label;import com.google.gwt.user.client.ui.ListBox;import com.google.gwt.user.client.ui.VerticalPanel;import com.google.gwt.user.client.ui.Widget;/** * Demonstrates {@link com.google.gwt.user.client.ui.ListBox}. */public class Lists extends Sink implements ChangeListener {  private static final String[][] sStrings = new String[][] {      new String[] {"foo0", "bar0", "baz0", "toto0", "tintin0"},      new String[] {"foo1", "bar1", "baz1", "toto1", "tintin1"},      new String[] {"foo2", "bar2", "baz2", "toto2", "tintin2"},      new String[] {"foo3", "bar3", "baz3", "toto3", "tintin3"},      new String[] {"foo4", "bar4", "baz4", "toto4", "tintin4"},};  public static SinkInfo init() {    return new SinkInfo("Lists",        "Here is the ListBox widget in its two major forms.") {      public Sink createInstance() {        return new Lists();      }    };  }  private ListBox combo = new ListBox();  private ListBox list = new ListBox();  private Label echo = new Label();  public Lists() {    combo.setVisibleItemCount(1);    combo.addChangeListener(this);    list.setVisibleItemCount(10);    list.setMultipleSelect(true);    for (int i = 0; i < sStrings.length; ++i) {      combo.addItem("List " + i);    }    combo.setSelectedIndex(0);    fillList(0);    list.addChangeListener(this);    HorizontalPanel horz = new HorizontalPanel();    horz.setVerticalAlignment(HorizontalPanel.ALIGN_TOP);    horz.setSpacing(8);    horz.add(combo);    horz.add(list);    VerticalPanel panel = new VerticalPanel();    panel.setHorizontalAlignment(VerticalPanel.ALIGN_LEFT);    panel.add(horz);    panel.add(echo);    initWidget(panel);    echoSelection();  }  public void onChange(Widget sender) {    if (sender == combo) {      fillList(combo.getSelectedIndex());    } else if (sender == list) {      echoSelection();    }  }  public void onShow() {  }  private void echoSelection() {    // Determine which items are selected, and display them.    String msg = "Selected items: ";    for (int i = 0; i < list.getItemCount(); ++i) {      if (list.isItemSelected(i)) {        msg += list.getItemText(i) + " ";      }    }    echo.setText(msg);  }  private void fillList(int idx) {    // Set the contents of the list box to reflect the combo selection.    list.clear();    String[] strings = sStrings[idx];    for (int i = 0; i < strings.length; ++i) {      list.addItem(strings[i]);    }    echoSelection();  }}