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Re: Drawing Invalidation Question

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Re: Drawing Invalidation Question

Subject: Re: Drawing Invalidation Question
From: Benjamin Dobson <email@hidden>
Date: Sun, 1 Feb 2009 09:39:51 +0000


On 1 Feb 2009, at 05:41:49, Seth Willits wrote:

When inside of -[NSView drawRect:], what's the difference between

- (void)drawRect:(NSRect)rect;
{
     if ([self needsToDrawRect:someRect])
         ....
}


... and ...


- (void)drawRect:(NSRect)rect;
{
     if (NSIntersectsRect(rect, someRect))
         ....
}

... ?

Apart from anything else, the first makes it clear what your intent is, which would be useful when you return to that bit of code later. _______________________________________________

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