Opacity Problem

In addendum:

If I programmatically set the containing form's Opacity and then create a SyntaxEditor, then it works fine.

It seems only to be a problem when changing Opacity on an existing SyntaxEditor.

Also if I have a Syntax editor created after the forms Opacity has been set,
then I programmatically move the main form's Opacity from say 40% from 60% Opacity - then all is well.
But if I programmatically move the main forms Opcaity from 40% to 100%, then to 99%, and then to say 90% - the problem then occurs with this new SyntaxEditor. Also, interestingly, on the move from 100% to 99% the SyntaxEditor goes completely black (this might be the trigger of the problem, because it happens with an existing SyntaxEditor too).

I am using Windows XP with all the latest service packs.

Hi Mark,

I did a test of setting it at run-time after the window was displayed and it worked fine for me. I tested with Vista and Aero enabled, and also with it disabled.

If there is a problem in XP then it may be an issue with our GDI drawing code (we use Windows APIs) and how Windows updates that based on the Opacity. The only thing I could suggest is calling this code to see if it helps:
editor.ResetDoubleBufferCanvas(true);

That will reset the double buffer, which may help with your issue.

Hi There

Thanks, that solved it nicely.

I had tried .Refresh() but not .ResetDoubleBufferCanvas()

editor.ResetDoubleBufferCanvas(true)