package polarDust.home;

/*
 * Copyright (c) 1996 Sorin Lazareanu, All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this software
 * and its documentation for NON-COMMERCIAL purposes and without
 * fee is hereby granted provided that this copyright notice
 * appears in all copies.
 *
 */

import polarDust.calculator.*;
import java.awt.*;
import java.applet.*;

/**
 * This class is used to instantiate an application by calling
 * CalculatorPanelxx classes. <br>
 * It takes one parameter: the code of the calculator.
 * The default is 01.<br>
 * Example: <pre>java Calculator 01</pre>  instantiates CalculatorPanel01<br>
 *
 * <br><br><a href=../source/polarDust/home/Calculator.java>Source code</a>
 *
 * @version 0.9, 1996.06.04
 * @author Sorin Lazareanu
 */

public class Calculator extends Frame {
	boolean bInAnApplet = true;
	/** The panel to be instantiated. */
	CalculatorPanel calcPanel;

	public Calculator(String arg) {
		super();
		new CalcHashtable();

		if (arg.equals("02")) calcPanel = new CalculatorPanel02();
		if (arg.equals("03")) calcPanel = new CalculatorPanel03();
		if (calcPanel == null) calcPanel = new CalculatorPanel01();
		configure();
	}

	/**  Private method. Prepares the layout of the frame */
	private void configure() {
		GridBagLayout gridBag = new GridBagLayout();
		GridBagConstraints c = new GridBagConstraints();
		GridBagLayoutHelper aHelper;

		setLayout(gridBag);
 		c.fill = GridBagConstraints.BOTH;
        c.anchor = GridBagConstraints.CENTER;
		c.insets = new Insets(0, 0, 0, 0);
		aHelper = new GridBagLayoutHelper(this, gridBag, c, 1, 1);

		aHelper.addComponent(0, 0, 1, 1, calcPanel);
		calcPanel.configure();
	}

	/** Callback method.  Handles some clean-up before the end of application,
	killing the threads that paint.  These threads require a runnable
	Screen Updater thread. */
    public boolean handleEvent(Event e) {

        if (e.id == Event.WINDOW_DESTROY) {

            if (bInAnApplet) {
                dispose();
                return false;
            } else {
				// panel thread is able to repaint even when
				// Screen Updater had stop running.
				calcPanel.stop();
                System.exit(0);
            }
        }
        return super.handleEvent(e);
    }

	/** Instantiates a new Calculator object. */
    public static void main(String args[]) {
        String arg = "01";
        Calculator aFrame;
        Insets insets;

        if (args.length > 0) arg = args[ 0 ];
        aFrame = new Calculator(arg);
        insets = aFrame.insets();
        aFrame.bInAnApplet = false;
        aFrame.setTitle("Calculator" + arg);
        aFrame.pack();
        aFrame.show();
    }

}