whiteboardscreen.java

J2ME MIDP_Example_Applications

// Copyright 2003 Nokia Corporation.
//
// THIS SOURCE CODE IS PROVIDED 'AS IS', WITH NO WARRANTIES WHATSOEVER,
// EXPRESS OR IMPLIED, INCLUDING ANY WARRANTY OF MERCHANTABILITY, FITNESS
// FOR ANY PARTICULAR PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE
// OR TRADE PRACTICE, RELATING TO THE SOURCE CODE OR ANY WARRANTY OTHERWISE
// ARISING OUT OF ANY PROPOSAL, SPECIFICATION, OR SAMPLE AND WITH NO
// OBLIGATION OF NOKIA TO PROVIDE THE LICENSEE WITH ANY MAINTENANCE OR
// SUPPORT. FURTHERMORE, NOKIA MAKES NO WARRANTY THAT EXERCISE OF THE
// RIGHTS GRANTED HEREUNDER DOES NOT INFRINGE OR MAY NOT CAUSE INFRINGEMENT
// OF ANY PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OWNED OR CONTROLLED
// BY THIRD PARTIES
//
// Furthermore, information provided in this source code is preliminary,
// and may be changed substantially prior to final release. Nokia Corporation
// retains the right to make changes to this source code at
// any time, without notice. This source code is provided for informational
// purposes only.
//
// Nokia and Nokia Connecting People are registered trademarks of Nokia
// Corporation.
// Java and all Java-based marks are trademarks or registered trademarks of
// Sun Microsystems, Inc.
// Other product and company names mentioned herein may be trademarks or
// trade names of their respective owners.
//
// A non-exclusive, non-transferable, worldwide, limited license is hereby
// granted to the Licensee to download, print, reproduce and modify the
// source code. The licensee has the right to market, sell, distribute and
// make available the source code in original or modified form only when
// incorporated into the programs developed by the Licensee. No other
// license, express or implied, by estoppel or otherwise, to any other
// intellectual property rights is granted herein.
package whiteboard;

import java.io.*;
import java.util.*;
import javax.microedition.io.*;

import javax.microedition.lcdui.*;

// Main screen showing the messages board
class WhiteboardScreen
     extends Form
     implements CommandListener
{
    private final WhiteboardMIDlet parent;
    private final Command exitCommand = new Command("Exit", Command.EXIT, 1);
    private final Command loadCommand = new Command("Load", Command.OK, 1);
    private final Command sendCommand = new Command("Send", Command.OK, 2);


    WhiteboardScreen(WhiteboardMIDlet parent)
    {
        super("Whiteboard");
        this.parent = parent;

        // set up this Displayable to listen to command events and add commands
        setCommandListener(this);
        addCommand(exitCommand);
        addCommand(loadCommand);
        addCommand(sendCommand);
    }


    public void commandAction(Command command, Displayable displayable)
    {
        if (command == exitCommand)
        {
            parent.notifyDestroyed();
        }
        else if (command == loadCommand)
        {
            parent.loadWhiteboard();
        }
        else if (command == sendCommand)
        {
            parent.showSendMessage();
        }
    }


    void whiteboardUpdated(Vector messages)
    {
        if (size() > 0)
        {
            delete(0);
        }
        int size = messages.size();
        if (size == 0)
        {
            append("No messages");
            return;
        }
        StringBuffer content = new StringBuffer();
        for (int i = 0; i < size; i++)
        {
            Message msg = (Message) messages.elementAt(i);
            StringBuffer line = new StringBuffer(msg.getUser()).append(" ").append(msg.getTimestamp()).append(" > ").append(msg.getContent()).append("\n");
            content.append(line);
        }
        append(content.toString());
    }

}