Re: jumpy scrolling on the Mac

On 2024-05-21 08:14, John Selverian wrote:
> Another observation.
> 
> Only the text that is entering view is ‘smeared’ (I don’t know
> how else to describe it). The text already in view is fine. This
> happens even when I only scroll 1 line at a time very slowly.

Yes, the way scrolling works is that pixels are bit-blitted up or down,
and any as-yet not executed repaint-rectangles are elongated in the
direction of the scroll.

So, bit-blitting is very has because its GPU-only, and independent of
what the contents actually is.

The repainting is potentially slower, because it depends on how it is
determined from the widget's contents.

> Also, if I click on the arrows in the scrollbar this does not happen.
> It only happens when scrolling with the mousewheel.

A click "jump-scrolls" so only repaints once w/no animation.

   -- JVZ




_______________________________________________
Foxgui-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/foxgui-users