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iPhoto-like scroll view
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iPhoto-like scroll view


  • Subject: iPhoto-like scroll view
  • From: Torsten Curdt <email@hidden>
  • Date: Sat, 8 Sep 2007 03:52:02 +0200

I am currently experimenting with a custom view that basically shows thumbnails like iPhoto does. Now while the basic drawing is still terrible inefficient (loads NSImages on every drawRect(), so it still needs caching ....and let's not talk about the memory leak (flood?) of the current code), what I am really wondering is something else:

Let's assume performance is bad to draw the rects that need an update. This somehow results into a very slow feeling of the application when I use the window scroll bar. What I am wondering is how to keep that still snappy and maybe just skip a few updates. Because when I scroll the bar at a very high speed I really only car about the final position of the bar. So how would I get the drawing to be a bit more lazy. Only do the update when the speed of the bar becomes slower. Does that require drawing to happen in different thread?

Something related would be to only draw empty rects when the speed of the slider becomes too high. And then switch back to a full display at lower speeds. How could this be done?

Any wise words?

cheers
--
Torsten
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