On May 3, 2017, at 09:27 , Richard Charles <rcharles...@gmail.com> wrote: > > So it appears that simply allowing the the size of a subview to go negative > when autoresizing fixes an issue that has been around since the days of > NeXTSTEP. So what am I missing?
I dunno, but I think you need to be a bit cautious with your solution. I have a vague recollection from years ago of running into trouble trying to use a NSSize structure with negative values. The details are lost, but IIRC there were situations where the negative value was replaced by its absolute value. Looking at the documentation for NSSize, I see this: > Normally, the values of width and height are non-negative. The functions that > create an NSSize structure do not prevent you from setting a negative value > for these attributes. If the value of width or height is negative, however, > the behavior of some methods may be undefined. Looking at the documentation for CGSize, I see this: > A CGSize structure is sometimes used to represent a distance vector, rather > than a physical size. As a vector, its values can be negative. Currently (that is for any macOS code that *isn’t* legacy 32-bit or doesn’t use the "build 32 bit like 64 bit” letting) NSSize and CGSize are literally the same thing, so I have to assume the discrepancy in the documentation reflects a difference that existed in the bad old days when NSSize and CGSize were different structs. Putting all that together, I would tentatively conclude that setting the subview size negative probably wouldn’t have worked for legacy 32-bit code, probably does work for current architectures, except that there may still be some edge cases where it still won’t behave exactly as you intend. You may be living a little dangerously, and how little that is, I don’t know. _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
