/*
* Copyright 2008 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.showcase.client.content.lists;
import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.RunAsyncCallback;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.i18n.client.Constants;
import com.google.gwt.sample.showcase.client.ContentWidget;
import com.google.gwt.sample.showcase.client.ShowcaseAnnotations.ShowcaseData;
import com.google.gwt.sample.showcase.client.ShowcaseAnnotations.ShowcaseSource;
import com.google.gwt.sample.showcase.client.ShowcaseAnnotations.ShowcaseStyle;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.ListBox;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;
/**
* Example file.
*/
@ShowcaseStyle(".gwt-ListBox")
public class CwListBox extends ContentWidget {
/**
* The constants used in this Content Widget.
*/
@ShowcaseSource
public static interface CwConstants extends Constants,
ContentWidget.CwConstants {
String[] cwListBoxCars();
String[] cwListBoxCategories();
String cwListBoxDescription();
String cwListBoxName();
String cwListBoxSelectAll();
String cwListBoxSelectCategory();
String[] cwListBoxSports();
String[] cwListBoxVacations();
}
/**
* An instance of the constants.
*/
@ShowcaseData
private CwConstants constants;
/**
* Constructor.
*
* @param constants the constants
*/
public CwListBox(CwConstants constants) {
super(constants);
this.constants = constants;
}
@Override
public String getDescription() {
return constants.cwListBoxDescription();
}
@Override
public String getName() {
return constants.cwListBoxName();
}
/**
* Initialize this example.
*/
@ShowcaseSource
@Override
public Widget onInitialize() {
// Create a panel to align the Widgets
HorizontalPanel hPanel = new HorizontalPanel();
hPanel.setSpacing(20);
// Add a drop box with the list types
final ListBox dropBox = new ListBox(false);
String[] listTypes = constants.cwListBoxCategories();
for (int i = 0; i < listTypes.length; i++) {
dropBox.addItem(listTypes[i]);
}
dropBox.ensureDebugId("cwListBox-dropBox");
VerticalPanel dropBoxPanel = new VerticalPanel();
dropBoxPanel.setSpacing(4);
dropBoxPanel.add(new HTML(constants.cwListBoxSelectCategory()));
dropBoxPanel.add(dropBox);
hPanel.add(dropBoxPanel);
// Add a list box with multiple selection enabled
final ListBox multiBox = new ListBox(true);
multiBox.ensureDebugId("cwListBox-multiBox");
multiBox.setWidth("11em");
multiBox.setVisibleItemCount(10);
VerticalPanel multiBoxPanel = new VerticalPanel();
multiBoxPanel.setSpacing(4);
multiBoxPanel.add(new HTML(constants.cwListBoxSelectAll()));
multiBoxPanel.add(multiBox);
hPanel.add(multiBoxPanel);
// Add a handler to handle drop box events
dropBox.addChangeHandler(new ChangeHandler() {
public void onChange(ChangeEvent event) {
showCategory(multiBox, dropBox.getSelectedIndex());
multiBox.ensureDebugId("cwListBox-multiBox");
}
});
// Show default category
showCategory(multiBox, 0);
multiBox.ensureDebugId("cwListBox-multiBox");
// Return the panel
return hPanel;
}
@Override
protected void asyncOnInitialize(final AsyncCallback<Widget> callback) {
GWT.runAsync(new RunAsyncCallback() {
public void onFailure(Throwable caught) {
callback.onFailure(caught);
}
public void onSuccess() {
callback.onSuccess(onInitialize());
}
});
}
/**
* Display the options for a given category in the list box.
*
* @param listBox the ListBox to add the options to
* @param category the category index
*/
@ShowcaseSource
private void showCategory(ListBox listBox, int category) {
listBox.clear();
String[] listData = null;
switch (category) {
case 0:
listData = constants.cwListBoxCars();
break;
case 1:
listData = constants.cwListBoxSports();
break;
case 2:
listData = constants.cwListBoxVacations();
break;
}
for (int i = 0; i < listData.length; i++) {
listBox.addItem(listData[i]);
}
}
}