SWTJface text带上拉样式

SWTJface text带下拉样式
 char[] autoActivationCharacters = new char[] { '.', '#' };
   KeyStroke keyStroke;
   //
   try {
     Text text = null;
     keyStroke = KeyStroke.getInstance("Ctrl+Space");
     ContentProposalAdapter adapter = new ContentProposalAdapter(text,
       new TextContentAdapter(),
       new SimpleContentProposalProvider(new String[] {
         "ProposalOne", "ProposalTwo", "ProposalThree" }),
         keyStroke, autoActivationCharacters);
     } catch (ParseException e1) {
     e1.printStackTrace();
   }