/**
 * IntegerField provides a range-checked data entry area for integers.<p>
 *
 * Copyright &copy; 1998-89 Martin Minow. All Rights Reserved.<p>
 *
 * Permission to use, copy, modify, and redistribute this software and its
 * documentation for personal, non-commercial use is hereby granted provided that
 * this copyright notice and appropriate documentation appears in all copies. This
 * software may not be distributed for fee or as part of commercial, "shareware,"
 * and/or not-for-profit endevors including, but not limited to, CD-ROM collections,
 * online databases, and subscription services without specific license.<p>
 *
 * Based on DateGUI.java in Mastering JavaBeans.
 * @see <a href="http://www.sybase.com">Sybase</a>, click on
 *	"Catalog>Updates>Mastering JavaBeans".
 * @author <a href="mailto:minow@pobox.com">Martin Minow</a>
 * @version 1.0a0
 * Set tabs every 4 characters.
 *
 * Bugs: This should probably be in a utility path, rather than in
 * the astro bean path.
 *
 */
package org.minow.applets.sunsphere;
import java.beans.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import java.text.*;

public class IntegerField extends TextField
		implements TextListener
{
    private Toolkit		toolkit;
    private NumberFormat	integerFormatter;
    private String		lastGoodString;
    private int			minimum;
    private int			maximum;
    private String		myName		= "";
    public IntegerField()
    {
	this(3, 0, 0, 0);
    }
    public IntegerField(
	    int			columns
	)
    {
    	this(columns, 0, 0, 0);
    }
    public IntegerField(
    	    int			columns,
    	    int			initialValue,
    	    int			minimum,
    	    int			maximum
    	)
    {
	super(columns);
	this.minimum		= minimum;
	this.maximum		= maximum;
	toolkit			= Toolkit.getDefaultToolkit();
	integerFormatter	=
		NumberFormat.getNumberInstance(Locale.getDefault());
	integerFormatter.setParseIntegerOnly(true);
	addTextListener(this);
	lastGoodString		= Integer.toString(initialValue);
	setText(lastGoodString);
    }

    public void setMyName(
    	    String myName
    	)
    {
    	this.myName = myName;
    }

    public int getValue()
    {
    	if (lastGoodString.length() == 0) {
    	    lastGoodString	= "0";
    	}
	try {
	    return(integerFormatter.parse(lastGoodString).intValue());
	}
	catch (ParseException e) {
	    System.err.println("Unexpected exception " + e.getMessage()
		+ " parsing \"" + lastGoodString + "\"");
	    lastGoodString = "0";
	    return (0);
	}
    }
    public void setValue(
	    int			value
	)
    {
	lastGoodString		= integerFormatter.format(value);
	setText(lastGoodString);
	selectAll();
    }
    public void setMinimum(
    	    int			minimum
    	)
    {
    	this.minimum		= minimum;
    	if (minimum < maximum && Integer.parseInt(getText()) < minimum) {
    	    String newString	= Integer.toString(minimum);
    	    setText(newString);
    	    lastGoodString	= newString;
    	}
    }
    public int getMinimum()
    {
    	return (minimum);
    }
    public void setMaximum(
    	    int			maximum
    	)
    {
    	this.maximum		= maximum;
    	if (minimum < maximum && Integer.parseInt(getText()) > minimum) {
    	    String newString	= Integer.toString(maximum);
    	    setText(newString);
    	    lastGoodString	= newString;
    	}
    }
    public int getMaximum()
    {
    	return (maximum);
    }
    /*
     * Implement the TextListener interface.
     */
    public synchronized void textValueChanged(
	    TextEvent		event
	)
    {
	try {
	    String newString	= getText();
	    if (newString.length() != 0) {
		int newValue	= Integer.parseInt(newString);
		if (minimum < maximum
		 && (newValue < minimum || newValue > maximum)) {
		    throw new NumberFormatException("range");
		}    
	    }
	    lastGoodString	= newString;
	}
	catch (NumberFormatException e) {
	    if (SunSphere.logErrors) {
		System.out.println(myName + " IntegerField error."
			+ "\nOld String = \"" + lastGoodString + "\""
			+ "\nNew String = \"" + getText() + "\""
			+ "\n" + e
		    );
	    }
	    toolkit.beep();
	    setText(lastGoodString);
	}
    }				
}