Re: Affine transform not being applied to subviews
Re: Affine transform not being applied to subviews
- Subject: Re: Affine transform not being applied to subviews
- From: Kyle Sluder <email@hidden>
- Date: Thu, 21 May 2009 22:59:32 -0400
On Thu, May 21, 2009 at 10:52 PM, Ken Tozier <email@hidden> wrote:
> Perhaps I'm not understanding how transforms are supposed to work, but from
> my reading of the relevant drawing and transform documentation, I got the
> impression that if a transform was applied to a view, it treated the view
> and all it's subviews as a single unit. Is that not the case?
There's no reason to assume that a superview's -drawRect will be
called before a subview's -drawRect, and even if there were there's no
guarantee that the framework doesn't call -[NSGraphicsContext
saveGraphicsState] before and -[NSGraphicsContext
restoreGraphicsState] afterwards. This is especially true when AppKit
optimizes away a superview draw when a subview that returns YES from
-isOpaque completely obscures the superview.
If you want to apply scaling to your subviews, you need to use the
frame and bounds rectangles appropriately or communicate your
transformation matrices to your subviews as you are currently doing.
--Kyle Sluder
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