The listener interface for receiving text events.
The class that is interested in processing a text event
implements this interface. The object created with that
class is then registered with a component using the
component's
addTextListener
method. When the
component's text changes, the listener object's
textValueChanged
method is invoked.
Invoked when the value of the text has changed.
The code written for this method performs the operations
that need to occur when text changes.