com.example.app.client.EchoWidget.java Source code

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Here is the source code for com.example.app.client.EchoWidget.java

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/*
 * 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.example.app.client;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.Grid;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.Widget;

import com.example.app.shared.EchoService;
import com.example.app.shared.EchoServiceAsync;

/**
 * A simple widget that allows the invocation of the {@link EchoService}.
 */
public class EchoWidget extends Composite {
    public EchoWidget(final EchoServiceAsync service, final ExceptionHandler handler) {
        final Grid grid = new Grid(3, 2);
        final TextBox box = new TextBox();

        grid.setWidget(0, 0, label("Message"));
        grid.setWidget(0, 1, box);
        grid.setWidget(1, 0, label("Result"));
        grid.setWidget(2, 1, new Button("Invoke", new ClickHandler() {
            //@Override
            public void onClick(ClickEvent event) {
                service.echo(box.getText(), new AsyncCallback<String>() {
                    //@Override
                    public void onFailure(Throwable caught) {
                        grid.setText(1, 1, "ERROR: " + caught.toString());
                        handler.handle(caught);
                    }

                    //@Override
                    public void onSuccess(String result) {
                        grid.setText(1, 1, result);
                    }
                });
            }
        }));
        initWidget(grid);
    }

    private Widget label(String text) {
        return new HTML("<b>" + text + ":</b> ");
    }
}