How to trap a PASTE in a TEXT widget - swt

Question

I have a TEXT entry field. I want to limit the entry to letters or digits. Other characters should be converted to an under-score. The following code does this. However when the user pastes into the field, it bypasses the listener and the raw text is put into the field
private class TextKeyVerifyListener implements VerifyListener
{
#Override
public void verifyText( VerifyEvent event )
{
if (Character.isLetterOrDigit( event.character ))
event.text = "" + Character.toUpperCase( event.character );
else if (!Character.isISOControl( event.keyCode ))
event.text = "_";
}
}
How do I trap the paste action so at least I can re-parse the text field. It seems kind of heavy duty to do this in the modify listener for each keystroke. Any solution should be cross-platform :-)
Trapping for CTRL-V might do this, but the user can also use the pop menu and choose paste.

Answer 1

VerifyEvent has a text field containing all the text to be verified. You should be using this rather than the character field. text is set to the full pasted text.

Answer 2

Ok, for anyone else trying to do this:
if (event.keyCode == 0 || !Character.isISOControl( event.keyCode ))
{
StringBuilder text = new StringBuilder();
char[] chars = event.text.toCharArray();
for (char character : chars)
if (Character.isLetterOrDigit( character ))
text.append( Character.toUpperCase( character ) );
else
text.append( "_" ); //$NON-NLS-1$
event.text = text.toString();
}
It's a little heavy for single keystrokes, but it will convert as I wanted.
Thanks!