title: SWT Text block actions outside of the TextField
body: <p>I have an SWT Text and I want it to have Focus until the User Enters something.</p>
  
  <p>Currently I´m using a FocusListener and check at focusLost Event, if the User has entered something. If not, I throw him back to the Text Field. </p>
  
  <p>I think this is the wrong way as I don´t want anything to happen which I have to reverse then (e.g. if the user focuses another Part, I have to give focus back to the part with the Text and so on) </p>
  
  <p>Does SWT provide me a way of blocking any other action but entering something into the SWT Text? </p>
  
  <p>Like a Listener that gets triggered before the action happens and in which I can prevent the action to happen? Like a VerifyListener for every event type?</p>