I'm having a hard time figuring out how these are all interconnected.
Specifically, I'm trying to implement a button that sets or clears bold
on selected text depending on whether the first character of the
selceted text is already bold or not.

           StyledDocument doc = textRegion.getStyledDocument();
           int offset = textRegion.getSelectionStart();
           int length = textRegion.getSelectionEnd() - offset;
           Style current = doc.getLogicalStyle(offset);
           MutableAttributeSet attr = new SimpleAttributeSet();
           if ( StyleConstants.isBold(current)) {
               StyleConstants.setBold(attr, false);
           } else {
               StyleConstants.setBold(attr,true);
           }
           doc.setCharacterAttributes(offset, length, attr, false);

But what it does is to set bold on no matter what. Obviously I'm not
understanding how to find out if a given character in a StyledDocument
is bold or not. How am I supposed to be doing this?

Thanks

--gary