Java tutorial
/* * 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.i18n; import com.google.gwt.core.client.GWT; import com.google.gwt.core.client.RunAsyncCallback; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.event.dom.client.KeyUpEvent; import com.google.gwt.event.dom.client.KeyUpHandler; 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.ShowcaseRaw; import com.google.gwt.sample.showcase.client.ShowcaseAnnotations.ShowcaseSource; import com.google.gwt.user.client.rpc.AsyncCallback; import com.google.gwt.user.client.ui.Anchor; import com.google.gwt.user.client.ui.FlexTable; import com.google.gwt.user.client.ui.FlexTable.FlexCellFormatter; import com.google.gwt.user.client.ui.HTML; import com.google.gwt.user.client.ui.HasVerticalAlignment; import com.google.gwt.user.client.ui.HorizontalPanel; import com.google.gwt.user.client.ui.TextBox; import com.google.gwt.user.client.ui.Widget; /** * Example file. */ @ShowcaseRaw({ "ErrorMessages.java", "ErrorMessages.properties" }) public class CwMessagesExample extends ContentWidget { /** * The constants used in this Content Widget. */ @ShowcaseSource public static interface CwConstants extends Constants { String cwMessagesExampleArg0Label(); String cwMessagesExampleArg1Label(); String cwMessagesExampleArg2Label(); String cwMessagesExampleDescription(); String cwMessagesExampleFormattedLabel(); String cwMessagesExampleLinkText(); String cwMessagesExampleName(); String cwMessagesExampleTemplateLabel(); } /** * The {@link TextBox} where the user enters argument 0. */ @ShowcaseData private TextBox arg0Box = null; /** * The {@link TextBox} where the user enters argument 1. */ @ShowcaseData private TextBox arg1Box = null; /** * The {@link TextBox} where the user enters argument 2. */ @ShowcaseData private TextBox arg2Box = null; /** * An instance of the constants. */ @ShowcaseData private final CwConstants constants; /** * The error messages used in this example. */ @ShowcaseData private ErrorMessages errorMessages = null; /** * The {@link HTML} used to display the message. */ @ShowcaseData private HTML formattedMessage = null; /** * Constructor. * * @param constants the constants */ public CwMessagesExample(CwConstants constants) { super(constants.cwMessagesExampleName(), constants.cwMessagesExampleDescription(), false, "ErrorMessages.java", "ErrorMessages.properties"); this.constants = constants; } /** * Initialize this example. */ @ShowcaseSource @Override public Widget onInitialize() { // Create the internationalized error messages errorMessages = GWT.create(ErrorMessages.class); // Use a FlexTable to layout the content FlexTable layout = new FlexTable(); FlexCellFormatter formatter = layout.getFlexCellFormatter(); layout.setCellSpacing(5); // Add a link to the source code of the Interface final String rawFile = getSimpleName(ErrorMessages.class); Anchor link = new Anchor(rawFile); link.addClickHandler(new ClickHandler() { public void onClick(ClickEvent event) { fireRawSourceRequest(rawFile + ".java"); } }); HorizontalPanel linkPanel = new HorizontalPanel(); linkPanel.setSpacing(3); linkPanel.add(new HTML(constants.cwMessagesExampleLinkText())); linkPanel.add(link); layout.setWidget(0, 0, linkPanel); formatter.setColSpan(0, 0, 2); // Show the template for reference String template = errorMessages.permissionDenied("{0}", "{1}", "{2}"); layout.setHTML(1, 0, constants.cwMessagesExampleTemplateLabel()); layout.setHTML(1, 1, template); // Add argument 0 arg0Box = new TextBox(); arg0Box.setText("amelie"); layout.setHTML(2, 0, constants.cwMessagesExampleArg0Label()); layout.setWidget(2, 1, arg0Box); // Add argument 1 arg1Box = new TextBox(); arg1Box.setText("guest"); layout.setHTML(3, 0, constants.cwMessagesExampleArg1Label()); layout.setWidget(3, 1, arg1Box); // Add argument 2 arg2Box = new TextBox(); arg2Box.setText("/secure/blueprints.xml"); layout.setHTML(4, 0, constants.cwMessagesExampleArg2Label()); layout.setWidget(4, 1, arg2Box); // Add the formatted message formattedMessage = new HTML(); layout.setHTML(5, 0, constants.cwMessagesExampleFormattedLabel()); layout.setWidget(5, 1, formattedMessage); formatter.setVerticalAlignment(5, 0, HasVerticalAlignment.ALIGN_TOP); // Add handlers to all of the argument boxes KeyUpHandler keyUpHandler = new KeyUpHandler() { public void onKeyUp(KeyUpEvent event) { updateMessage(); } }; arg0Box.addKeyUpHandler(keyUpHandler); arg1Box.addKeyUpHandler(keyUpHandler); arg2Box.addKeyUpHandler(keyUpHandler); // Return the layout Widget updateMessage(); return layout; } @Override protected void asyncOnInitialize(final AsyncCallback<Widget> callback) { GWT.runAsync(CwMessagesExample.class, new RunAsyncCallback() { public void onFailure(Throwable caught) { callback.onFailure(caught); } public void onSuccess() { callback.onSuccess(onInitialize()); } }); } /** * Update the formatted message. */ @ShowcaseSource private void updateMessage() { String arg0 = arg0Box.getText().trim(); String arg1 = arg1Box.getText().trim(); String arg2 = arg2Box.getText().trim(); formattedMessage.setText(errorMessages.permissionDenied(arg0, arg1, arg2)); } }