// Copyright 2002 Nokia Corporation. 
// 
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// EXPRESS OR IMPLIED, INCLUDING ANY WARRANTY OF MERCHANTABILITY, FITNESS 
// FOR ANY PARTICULAR PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE 
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// Furthermore, information provided in this source code is preliminary, 
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// retains the right to make changes to this source code at 
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package example.sum;

import javax.microedition.lcdui.*;
import java.io.IOException;


class SumScreen
    extends Form
    implements CommandListener, HttpPosterListener
{
    private final SumMIDlet midlet;
    private final HttpPoster httpPoster;
    private final TextField inputField;
    private final StringItem outputField;
    private final Command sendCommand;
    private final Command quitCommand;
    private volatile boolean readyForInput = true;


    SumScreen(SumMIDlet midlet,
              HttpPoster httpPoster)
    {
        super("Sum");
        this.midlet = midlet;
        this.httpPoster = httpPoster;

        inputField = new TextField("Input:", "1", 8, TextField.NUMERIC);
        append(inputField);
        outputField = new StringItem("Output:", "0");
        append(outputField);
        sendCommand = new Command("Send", Command.SCREEN, 2);
        addCommand(sendCommand);
        quitCommand = new Command("Quit", Command.EXIT, 2);
        addCommand(quitCommand);

        setCommandListener(this);
    }


    public void commandAction(Command c, Displayable d)
    {
        if (c == quitCommand)
        {
            midlet.sumScreenQuit();
        }
        else if (readyForInput)
        {
            if (c == sendCommand)
            {
                try
                {
                    String requestStr = inputField.getString();
                    httpPoster.sendRequest(requestStr, this);
                    readyForInput = false;
                }
                catch (IOException e)
                {
                    outputField.setText("Error");
                }
            }
        }
    }


    public void receiveHttpResponse(String response)
    {
        outputField.setText(response);
        readyForInput = true;
    }


    public void handleHttpError(String errorStr)
    {
        outputField.setText("Error");
        readyForInput = true;
    }
}