Possible to InvalidateVisual() on a given region instead of entire WPF control?

Posted by Scott Bilas on Stack Overflow See other posts from Stack Overflow or by Scott Bilas
Published on 2010-04-05T02:03:05Z Indexed on 2010/04/05 2:13 UTC
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wpf

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rendering

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ui

I have a complex WPF control that draws a lot of primitives in its OnRender (it's sort of like a map). When a small portion of it changes, I'd only like to re-issue render commands for the affected elements, instead of running the entire OnRender over. While I'm fine with my OnRender function's performance on a resize or whatever, it's not fast enough for mouse hover-based highlighting of primitives.

Currently the only way I know how to force a screen update is to call InvalidateVisual(). No way to send in a dirty rect region to invalidate.

Is the lowest granularity of WPF screen composition the UI element? Will I need to do my renders of primitives into an intermediate target and then have that use InvalidateVisual() to update to the screen?

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