Description Elias Volanakis 2010-12-17 02:09:42 EST

There is a difference between typed / untyped listener treatment in SWT / RWT.

In SWT typed listeners are wrapped into untyped ones, and are equivalent:

text.addVerifyListener(vl);
Listener[] listeners = text.getListeners(SWT.Verify); // 1 entry
text.removeListener(listener[0]); 

In RWT typed listeners and untyped listeners are disjunct and not treated as equivalent.

text.addVerifyListener(vl);
Listener[] listeners = text.getListeners(SWT.Verify); //0 entries
text.removeListener(listener[0]);  // fail

There is internal code to get the same effect:
    
    text.addVerifyListener(vl);
	VerifyListener[] listeners2 = (VerifyListener[]) VerifyEvent.getListeners(text); // 1 entry
			for(VerifyListener lsnr : listeners2) {
				VerifyEvent.removeListener(text, lsnr);
			}

The following classes are affected and might need review / adjustment

- NumericTextRidget
- TextRidget
- AbstractSWTWidgetRidget
- TestUtils (though we don't run this on RAP)
- CompletionCombo -- already fixed by me a few months ago :)

The equivalent in RWT uses internal code: