Re: NSView's DrawRect
Re: NSView's DrawRect
- Subject: Re: NSView's DrawRect
- From: "Clark S. Cox III" <email@hidden>
- Date: Sun, 10 Feb 2002 16:05:32 -0500
On Sunday, February 10, 2002, at 11:42 , Sven-S. Porst wrote:
I've made a subclass of NSView that draws a grid of blocks. In particular
I am converting the coordinates I receive from -drawRect to my 'block'
coordinates to determine which blocks need redrawing.
When I am moving the contents of a particular block to a different block
I call
-setNeedsDisplayInRect for the block it originates from and the
destination. Strangely when debugging or using the 'Quartz Debug'
application it seems that I am asked to redraw the whole rect spanned by
the two rects I passed to -setNeedsDisplayInRect. This seems a bit
wasteful.
Why does this happen and how can I prevent it?
I guess, I could call my drawing method directly instead of using -
setNeedsDisplayInRect but so far my impression was that this isn't
considered the 'proper' way to do it.
Any comments or pointers for a better understanding of what's going on
are appreciated.
There was a big discussion about this several months ago, and it
basically boiled down to: Apple's implementation is broken, however, it
would be a bad idea to try and work around it by calling tour drawing
method directly, and that it would be a better idea to pester Apple until
they fix it.
--
Clark S. Cox, III
email@hidden
http://www.whereismyhead.com/clark/
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