Re: [platform-swt-dev] GC operations outside paint callback

[Randy Hudson <hudsonr@xxxxxxxxxx>]

This works fine.  This is how draw2d
paints.  The only known issues are on GTK if you ARE inside a paint
callback, and you try to create your own GC with a bigger clip region than
the one sent in the paint event, painting will still be clipped to the
region sent in the event.  The workaround is to use the repaint mechanism
always or at least when this occurs.

-Randy

Knut Radloff/Raleigh/IBM@IBMUS Sent by: platform-swt-dev-admin@xxxxxxxxxxx 07/23/2004 04:00 PM Please respond to platform-swt-dev

To:        platform-swt-dev@xxxxxxxxxxx         cc:                 Subject:        [platform-swt-dev] GC operations outside paint callback

Is it valid for an application to render directly on a GC, outside a paint
callback? E.g., given the code below am I guaranteed to get the expected
line on all SWT implementations? I don't think this is spec'd anywhere.
Is this "implementation dependent" behavior?

shell = new Shell() 
shell.open() 
gc = new GC(shell); 
gc.drawLine(0, 0, 10, 0); 

The JUnit tests don't call GC operations inside a paint callback but they
also don't test if a call actually rendered the expected output.

Thanks, Knut