[news.eclipse.platform.swt] Re: using PaintListener causes components to

[Alejandro Bascuas <alej@xxxxxxxxxx>]

While producing the requested snippet, my user error became obvious. In 
the PaintListener, I was scaling the image, and then calling 
setBackgroundImage() on the Widget, which is a Composite.

Everything works correctly when I modified it to use GC.drawImage(Image, 
int, int).

FYI, the reason I prefer calling Composite.setBackgroundImage() is so 
that child widgets inherit the background image, which doesn't happen 
when I draw on the parent composite directly.

Thanks,

Alej.

Grant Gayed wrote:
> This should not be the case.  Please log a report with SWT at
> https://bugs.eclipse.org/bugs/enter_bug.cgi?product=Platform&component=SWT
> and provide a snippet that shows it happening (snippet template:
> http://www.eclipse.org/swt/faq.php#whatisasnippet ).
>
> Thanks,
> Grant
>
>
> "Alejandro Bascuas" <alej@xxxxxxxxxx> wrote in message
> news:fuqcm0$r9l$1@xxxxxxxxxxxxxxxxxxxx
> > I was using a PaintListener to scale a background image when the
> > Composite is resized.
> >
> > I noticed that when my shell loses focus, and then regains, the controls
> > within it were not being automatically redrawn. It seems like adding the
> > PaintListener broke some chain where elements are redrawn by the OS
> > (Windows XP in my case) when a window moves to the foreground.
> >
> > I was able to work around this by scaling my image in a ControlListener.
> > However, adding a PaintListener should not cause this type of failure.
> >
> > Any comments?
> >
> > Alej.