[Mono-bugs] [Bug 616121] Need to be able to construct CGContext from IntPtr to implement layer drawing

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http://bugzilla.novell.com/show_bug.cgi?id=616121

http://bugzilla.novell.com/show_bug.cgi?id=616121#c3


Frank Krueger <fak at kruegersystems.com> changed:

           What    |Removed                     |Added
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             Status|NEEDINFO                    |NEW
       InfoProvider|fak at kruegersystems.com      |

--- Comment #3 from Frank Krueger <fak at kruegersystems.com> 2010-06-24 17:00:52 UTC ---
Please read:

http://developer.apple.com/iphone/library/documentation/WindowsViews/Conceptual/UIScrollView_pg/ZoomZoom/ZoomZoom.html#//apple_ref/doc/uid/TP40008179-CH102-SW9

"The class will need to change the Core Animation class used as the UIView
class’s layer to CATiledLayer and draw using the Core Animation
drawLayer:inContext: method."

I want to implement that example snippet. I have succeeded by implementing my
own CGContext and doing my own PInvokes. However, I would *much* prefer to use
MT's CGContext because I stink at interop and keep the parallel class is silly
given that CGContext already has a perfectly good constructor.

Layers aren't typically changed using inheritance. Instead, one assigns a
delegate and that delegate must respond to the drawLayer:inContext:

Because UIView does not contain that selector you do not provide a virtual
version of it. I have to implement it using [Selector(...)] magic.

In this case, I use a CATiledLayer as the layer class of my UIView. I do *not*
inherit from CATiledLayer. I do my drawing in drawLayer:inContext:

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