import java.awt.*;

/*
 *
 * NumberTextField.java
 * Customised AWT component 
 * Demonstration for Java 107 tutorial
 * David Reilly, 21 February, 1998
 *
 */	

public class NumberTextField extends TextField
{	
	public NumberTextField(int cols)
	{
		super (cols);
	}

	public boolean keyDown(Event evt, int key)
	{
		// Cast to a character
		char keyChar = (char) key;

		// Accept 0-9, . -, backspace or delete
		if ( ((keyChar > '0') && (keyChar < '9')) ||
			 (keyChar == '.') || (keyChar == '-') ||
			 (keyChar == 8 )  || (keyChar == 127) )
		{			
			// Pass along to our superclass
			return super.keyDown(evt, key);
		}
		else
			// Yes we've handled it... by ignoring invalid data
			return true;

	}
}