Re: JSpinner in hex

  To: comp.lang.java.gui
On Wed, 15 Aug 2007 16:39:30 +0200, Thomas Fritsch
<i.dont.like.spam@invalid.com> wrote, quoted or indirectly quoted
someone who said :


Here is my variant that uses fixed width with lz padding. It handles
numbers 0..fffffff;

package com.mindprod.jcolourchooser;

import javax.swing.JFormattedTextField;
import javax.swing.JSpinner;

/**
 * @author Roedy Green, Canadian Mind Products
 * @version 1.0, 2007-08-15 Created with IntelliJ IDEA. Based on
Thomas
 * Fritsch's version posted in comp.lang.java.gui.
 */
public class HexNumberEditor extends JSpinner.NumberEditor {

    // -------------------------- PUBLIC INSTANCE METHODS
--------------------------
    /**
     * constructor
     *
     * @param spinner JSpinner this editor is attached to.
     * @param width how many chars wide the field is.
     */
    public HexNumberEditor( JSpinner spinner, int width )
        {
        super( spinner );
        JFormattedTextField ftf = getTextField();
        ftf.setEditable( true );
        ftf.setFormatterFactory( new HexNumberFormatterFactory( width
) );
        }
}

---------------------------------------------------------------------------------------------

package com.mindprod.jcolourchooser;

import javax.swing.text.DefaultFormatterFactory;

/**
 * @author Roedy Green, Canadian Mind Products
 * @version 1.0, 2007-08-15 Created with IntelliJ IDEA. Based on
Thomas
 * Fritsch's version posted in comp.lang.java.gui.
 */
public class HexNumberFormatterFactory extends DefaultFormatterFactory
{

    // -------------------------- PUBLIC INSTANCE METHODS
--------------------------
    /**
     * constructor
     *
     * @param width how many chars wide the field is.
     */
    public HexNumberFormatterFactory( int width )
        {
        super( new HexNumberFormatter( width ) );
        }
}
----------------------------------------------------------------------

package com.mindprod.jcolourchooser;

import javax.swing.text.DefaultFormatter;
import java.text.ParseException;

/**
 * hex formatter for use in JSpinner. handles 0..fffffff.
 *
 * @author Roedy Green, Canadian Mind Products
 * @version 1.0, 2007-08-15 Created with IntelliJ IDEA.
 */
public class HexNumberFormatter extends DefaultFormatter {

    // max chars with in hex digits.
    private final int width;

    // -------------------------- PUBLIC INSTANCE METHODS
--------------------------
    /**
     * constructor
     *
     * @param width how many chars wide is the field.
     */
    public HexNumberFormatter( int width )
        {
        if ( width > 7 )
            {
            throw new IllegalArgumentException( "HexFormat width > 7"
);
            }
        this.width = width;
        }

    /**
     * Converts the passed in String into an instance of
     * <code>getValueClass</code> by way of the constructor that takes
a String
     * argument. If <code>getValueClass</code> returns null, the Class
of the
     * current value in the <code>JFormattedTextField</code> will be
used. If
     * this is null, a String will be returned. If the constructor
thows an
     * exception, a <code>ParseException</code> will be thrown. If
there is no
     * single argument String constructor, <code>string</code> will be
     * returned.
     *
     * @param string String to convert
     *
     * @return Object representation of text, namely Integer
     *
     * @throws java.text.ParseException if there is an error in the
conversion
     */
    public Object stringToValue( String string ) throws ParseException
        {
        try
            {
            return Integer.valueOf( string, 16 );
            }
        catch ( NumberFormatException nfe )
            {
            throw new ParseException( string, 0 );
            }
        }

    /**
     * Converts the passed in Object into a String by way of the
     * <code>toString</code> method.
     *
     * @param value Value to convert, Integer
     *
     * @return String representation of value, padded with left zeroes
to
     * width.
     *
     * @throws ParseException if there is an error in the conversion
     */
    public String valueToString( Object value ) throws ParseException
        {
        final int asInt = (Integer) value;
        final String hex = Integer.toHexString( asInt );
        // apply lead zeroes as needed.
        final int lz = width - hex.length();
        if ( lz <= 0 )
            {
            return hex;
            }
        else
            {
            return "00000000".substring( 0, lz ) + hex;
            }
        }
}
--
Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

---
 * Synchronet * The Whitehouse BBS --- whitehouse.hulds.com --- check it out free usenet!
--- Synchronet 3.15a-Win32 NewsLink 1.92
Time Warp of the Future BBS - telnet://time.synchro.net:24