/*
 * Created on Apr 13, 2005 by Nick Didkovsky
 * 
 *  added calls to JavaScript 11/17/08
 *
 */
package didkovsky2604.applets;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

// needs jaws.jar to build
import netscape.javascript.JSObject;

/**
 * Receive messages from JavaScript. Send messages to JavaScript.
 * 
 * @author Nick Didkovsky, didkovn@mail.rockefeller.edu
 * 
 */
public class JavaScriptApplet extends java.applet.Applet {

    private Label jsLabel;
    private JSObject javascriptObject = null;
    private Button buttonToSendSomethingToJavaScript;

    private void sendSomethingToJavaScript() {
        if (javascriptObject == null) {
            javascriptObject = JSObject.getWindow(this);
        }
        if (javascriptObject != null) {
            javascriptObject.eval("foo()");
        } else {
            System.out.println("Cannot get javascriptObject");
        }
    }

    public void start() {
        setLayout(new FlowLayout());
        setBackground(new Color(200, 200, 200));
        add(new Label("Value sent from Javascript shows here: "));
        add(jsLabel = new Label("xxxxxxxxxxxxxxxxx"));
        add(buttonToSendSomethingToJavaScript = new Button("Click to send something to JavaScript"));
        buttonToSendSomethingToJavaScript.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent ev) {
                sendSomethingToJavaScript();
            }
        });
    }

    /**
     * Any public method in this Applet can be called from JavaScript. Nothing special about the
     * Applet itself
     */
    public void setValue(String value) {
        jsLabel.setText(value);
        System.out.println("setValue(" + value + ")");
    }
}