com.glines.socketio.examples.gwtchat.client.GWTChatClient.java Source code

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Here is the source code for com.glines.socketio.examples.gwtchat.client.GWTChatClient.java

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/**
 * The MIT License
 * Copyright (c) 2010 Tad Glines
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package com.glines.socketio.examples.gwtchat.client;

import com.glines.socketio.client.common.SocketIOConnection;
import com.glines.socketio.client.gwt.GWTSocketIOConnectionFactory;
import com.glines.socketio.common.DisconnectReason;
import com.glines.socketio.common.SocketIOException;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.dom.client.Element;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.dom.client.KeyPressHandler;
import com.google.gwt.event.dom.client.KeyPressEvent;
import com.google.gwt.json.client.JSONArray;
import com.google.gwt.json.client.JSONObject;
import com.google.gwt.json.client.JSONParser;
import com.google.gwt.json.client.JSONString;

public class GWTChatClient implements EntryPoint, SocketIOConnection.SocketIOConnectionListener {

    SocketIOConnection socket;
    HTML htmlPanel;
    FlowPanel submitPanel;
    TextBox textBox;

    public void onModuleLoad() {
        RootPanel rootPanel = RootPanel.get();
        rootPanel.setSize("800", "300");

        htmlPanel = new HTML("Connecting...");
        htmlPanel.setStyleName("chat");
        rootPanel.add(htmlPanel);

        submitPanel = new FlowPanel();
        submitPanel.setStyleName("submitPanel");
        rootPanel.add(submitPanel);
        submitPanel.setWidth("800");
        submitPanel.setVisible(false);

        textBox = new TextBox();
        textBox.setVisibleLength(109);
        textBox.addKeyPressHandler(new KeyPressHandler() {
            public void onKeyPress(KeyPressEvent event) {
                if (event.getCharCode() == KeyCodes.KEY_ENTER) {
                    onSubmit();
                }
            }
        });
        textBox.setSize("", "30");
        submitPanel.add(textBox);

        Button btnSubmit = new Button("Submit");
        btnSubmit.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                onSubmit();
            }
        });
        btnSubmit.setHeight("30");
        submitPanel.add(btnSubmit);

        socket = GWTSocketIOConnectionFactory.INSTANCE.create(this, null, (short) 0);
        socket.connect();
    }

    private void addLine(String line) {
        Element p = DOM.createElement("p");
        p.setInnerHTML(line);
        htmlPanel.getElement().appendChild(p);
        htmlPanel.getElement().setScrollTop(1000000);
    }

    private void onSubmit() {
        String text = textBox.getText();

        if (text.equals("/lclose")) {
            addLine("<em>closing...</em>");
            socket.close();
        } else if (text.equals("/ldisconnect")) {
            addLine("<em>disconnecting...</em>");
            socket.disconnect();
        } else {
            addLine("<b>you:</b> " + text);
            textBox.setText("");
            try {
                socket.sendMessage(text);
            } catch (SocketIOException e) {
                // Ignore. This wwon't happen in the GWT version.
            }
        }
    }

    @Override
    public void onConnect() {
        htmlPanel.setHTML("");
        submitPanel.setVisible(true);
    }

    @Override
    public void onDisconnect(DisconnectReason reason, String errorMessage) {
        submitPanel.setVisible(false);
        if (errorMessage != null) {
            addLine("<b>Disconnected[" + reason + "]:</b> " + errorMessage);
        } else {
            addLine("<b>Disconnected[" + reason + "]</b>");
        }
    }

    private void onMessage(JSONObject obj) {
        if (obj.containsKey("welcome")) {
            JSONString str = obj.get("welcome").isString();
            if (str != null) {
                addLine("<em><b>" + str.stringValue() + "</b></em>");
            }
        } else if (obj.containsKey("announcement")) {
            JSONString str = obj.get("announcement").isString();
            if (str != null) {
                addLine("<em>" + str.stringValue() + "</em>");
            }
        } else if (obj.containsKey("message")) {
            JSONArray arr = obj.get("message").isArray();
            if (arr != null && arr.size() >= 2) {
                JSONString id = arr.get(0).isString();
                JSONString msg = arr.get(1).isString();
                if (id != null && msg != null) {
                    addLine("<b>" + id.stringValue() + ":</b> " + msg.stringValue());
                }
            }
        }
    }

    @Override
    public void onMessage(int messageType, String message) {
        if (messageType == 1) {
            JSONObject obj = JSONParser.parse(message).isObject();
            if (obj != null) {
                onMessage(obj);
            }
        }
    }
}