// This example is from the book _Java AWT Reference_ by John Zukowski.
// Written by John Zukowski.  Copyright (c) 1997 O'Reilly & Associates.
// You may study, use, modify, and distribute this example for any purpose.
// This example is provided WITHOUT WARRANTY either expressed or
import java.awt.*;
public class SizedTextField extends TextField {
    private int size;  // size = 0 is unlimited
    public SizedTextField () {
        super ("");
        this.size = 0;
    }
    public SizedTextField (int columns) {
        super (columns);
        this.size = 0;
    }
    public SizedTextField (int columns, int size) {
        super (columns);
        this.size = Math.max (0, size);
    }
    public SizedTextField (String text) {
        super (text);
        this.size = 0;
    }
    public SizedTextField (String text, int columns) {
        super (text, columns);
        this.size = 0;
    }
    public SizedTextField (String text, int columns, int size) {
        super (text, columns);
        this.size = Math.max (0, size);
    }
    public boolean keyDown (Event e, int key) {
        if ((e.id == Event.KEY_PRESS) && (this.size > 0) &&
            (((TextField)(e.target)).getText ().length () >= this.size)) {
            // Check for backspace / delete / tab -- let these pass through
            if ((key == 127) || (key == 8) || (key == 9)) {
                return false;
            }
            return true;
        }
        return false;
    }
    protected String paramString () {
        String str = super.paramString ();
        if (size != 0) {
            str += ",size=" + size;
        }
        return str;
    }
}