/*
* Copyright 2009 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.language.sample.hellolanguage.client;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.language.client.translation.BrandingOptions;
import com.google.gwt.language.client.translation.Language;
import com.google.gwt.language.client.translation.Translation;
import com.google.gwt.language.client.translation.TranslationCallback;
import com.google.gwt.language.client.translation.TranslationResult;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.HasHorizontalAlignment;
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.TextArea;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;
/**
* Demo for translation API.
*/
public class TranslationDemo extends Composite {
private final TextArea inputTextArea = new TextArea();
private final Label outputDiv = new Label();
private final ListBox sourceLanguages = new ListBox();
private final ListBox destinationLanguages = new ListBox();
public TranslationDemo() {
inputTextArea.setStyleName(Styles.DEMO_TEXTAREA_STYLE);
outputDiv.setStyleName(Styles.TRANS_OUTPUT_DIV_STYLE);
VerticalPanel wrapperPanel = new VerticalPanel();
wrapperPanel.setWidth("100%");
VerticalPanel demoPanel = getDemoPanel();
wrapperPanel.add(demoPanel);
wrapperPanel.setCellHorizontalAlignment(demoPanel,
HasHorizontalAlignment.ALIGN_CENTER);
Widget branding = Translation.createBrandingWidget(BrandingOptions.newInstance(BrandingOptions.Type.VERTICAL));
wrapperPanel.add(branding);
wrapperPanel.setCellHorizontalAlignment(branding,
HasHorizontalAlignment.ALIGN_RIGHT);
initWidget(wrapperPanel);
}
/**
* Creates a "Translate" button.
*
* @return button
*/
private Button createTranslateButton() {
Button translateButton = new Button("Translate");
translateButton.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
Language src = Language.valueOf(sourceLanguages.getItemText(sourceLanguages.getSelectedIndex()));
Language dest = Language.valueOf(destinationLanguages.getItemText(destinationLanguages.getSelectedIndex()));
// Translation API call to translate text
Translation.translate(inputTextArea.getText(), src, dest,
new TranslationCallback() {
@Override
protected void onCallback(TranslationResult result) {
if (result.getError() == null) {
outputDiv.setText(result.getTranslatedText());
} else {
outputDiv.setText(result.getError().getMessage());
}
}
});
}
});
return translateButton;
}
/**
* Creates translation control panel containing list boxes for source and
* destination languages, and a button to translate.
*
* @return panel containing controls
*/
private HorizontalPanel createTranslationControlPanel() {
populateListBoxes();
HorizontalPanel listBoxesPanel = new HorizontalPanel();
listBoxesPanel.add(sourceLanguages);
listBoxesPanel.add(new Label(">>"));
listBoxesPanel.add(destinationLanguages);
Button translateButton = createTranslateButton();
HorizontalPanel controlPanel = new HorizontalPanel();
controlPanel.setSpacing(10);
controlPanel.setWidth("100%");
controlPanel.add(listBoxesPanel);
controlPanel.add(translateButton);
controlPanel.setCellHorizontalAlignment(translateButton,
HasHorizontalAlignment.ALIGN_RIGHT);
return controlPanel;
}
/**
* Contains the entire demo panel.
*
* @return demo panel
*/
private VerticalPanel getDemoPanel() {
VerticalPanel demoPanel = new VerticalPanel();
demoPanel.add(new Label("Enter source language text: "));
demoPanel.add(inputTextArea);
demoPanel.add(createTranslationControlPanel());
demoPanel.add(new Label("Translated text:"));
demoPanel.add(outputDiv);
return demoPanel;
}
/**
* Populates list boxes with source and destination languages.
*/
private void populateListBoxes() {
int englishIndex = 0;
int spanishIndex = 0;
int iter = 0;
// Populate source & destination language list boxes.
for (Language lang : Language.values()) {
if (!Translation.isTranslatable(lang)) {
continue;
}
sourceLanguages.addItem(lang.toString());
destinationLanguages.addItem(lang.toString());
if (lang == Language.ENGLISH) {
englishIndex = iter;
} else if (lang == Language.SPANISH) {
spanishIndex = iter;
}
++iter;
}
// Select English as default source and Spanish as default destination
// languages.
sourceLanguages.setSelectedIndex(englishIndex);
destinationLanguages.setSelectedIndex(spanishIndex);
}
}