com.thingtrack.vaadin.desktop.MyVaadinUI.java Source code

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Here is the source code for com.thingtrack.vaadin.desktop.MyVaadinUI.java

Source

package com.thingtrack.vaadin.desktop;

/*
 * #%L
 * Vaadin Web Application
 * $Id:$
 * $HeadURL:$
 * %%
 * Copyright (C) 2013 Thingtrack S.L.
 * %%
 * 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.
 * #L%
 */

import org.eclipse.paho.client.mqttv3.MqttException;

import com.vaadin.server.VaadinRequest;
import com.vaadin.ui.Alignment;
import com.vaadin.ui.Button;
import com.vaadin.ui.Label;
import com.vaadin.ui.Notification;
import com.vaadin.ui.Notification.Type;
import com.vaadin.ui.TextArea;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;
import com.vaadin.ui.Button.ClickEvent;

/**
 * The Application's "main" class
 */
@SuppressWarnings("serial")
public class MyVaadinUI extends UI {

    private VerticalLayout mainLayout;
    private TextArea textArea;
    private Publisher publisher;

    @Override
    protected void init(VaadinRequest request) {

        mainLayout = new VerticalLayout();
        mainLayout.setSizeFull();
        mainLayout.setMargin(true);
        setContent(mainLayout);

        mainLayout.setDefaultComponentAlignment(Alignment.MIDDLE_CENTER);
        textArea = new TextArea();
        textArea.setInputPrompt("Send message");
        mainLayout.addComponent(textArea);

        Button button = new Button("Send");
        button.setImmediate(true);
        button.addClickListener(new Button.ClickListener() {

            @Override
            public void buttonClick(ClickEvent event) {

                if (publisher == null) {
                    publisher = new Publisher();
                    publisher.start();
                }

                String message = textArea.getValue();

                try {
                    publisher.send(message);
                } catch (MqttException e) {
                    Notification.show(e.getMessage(), Type.ERROR_MESSAGE);
                }
            }
        });

        mainLayout.addComponent(button);
    }
}