src/com/itmill/toolkit/tests/book/ChatApplication.java


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package com.itmill.toolkit.tests.book;

import java.util.*;
import com.itmill.toolkit.Application;
import com.itmill.toolkit.ui.*;
import com.itmill.toolkit.ui.Button.ClickEvent;

public class ChatApplication extends Application implements Button.ClickListener {
    /* ChatApplication instances of different users.
     * Warning: a hack, not safe, because sessions can expire. */
    static List users = new ArrayList();
    
    /* Messages as a shared list. */
    static List messages  = new ArrayList();
    int         localSize = 0;

    /* User interface. */
    Table       messageTable = new Table();
    TextField   username     = new TextField("Username:");
    TextField   message      = new TextField("Message:");

    public void init() {
        final Window main = new Window ("Chat");
        setMainWindow(main);
        setTheme("tests-magi");
        users.add(this);

        main.addComponent(username);

        main.addComponent(messageTable);
        messageTable.addContainerProperty("Sender", String.class, "");
        messageTable.addContainerProperty("Message", String.class, "");
        updateTable();
        
        main.addComponent(message);
        
        Button send = new Button("Send");
        send.addListener(this);
        main.addComponent(send);

        // Poll for new messages once a second.
        ProgressIndicator poller = new ProgressIndicator();
        poller.addStyleName("invisible");
        main.addComponent(poller);
    }

    public void buttonClick(ClickEvent event) {
        synchronized(users) {
            // Create the new message in the shared list.
            messages.add(new String[]{new String((String) username.getValue()),
                                      new String((String) message.getValue())});

            // Update the message tables for all users.
            for (Iterator i = users.iterator();i.hasNext();) 
                ((ChatApplication)i.next()).updateTable();
        }
    }

    void updateTable() {
        if (localSize == messages.size())
            return; // No updating needed

        // Add new messages to the table
        while (localSize < messages.size())
            messageTable.addItem((Object[])messages.get(localSize++),
                                 new Integer(localSize-1));
    }
}