Re: [PATCH (revised)] -setTarget: and -setAction of NSImageView

[Fred Kiefer]

Thank you Quentin,

but at GNUstep we prefer not to have a direct contact with Apple code or 
headers. I personaly think, that looking at headers should not be to 
problematic, but after the recent development with SCO we cannot be to 
careful. So please don't send any more information that has been 
directly captured from Apple copyrighted files,

On the other hand your findings and that of Ken Ferry cleary show that 
Apple did implement the setTarget: and setAction: methods on the level 
of the NSImageView. So we rather should do this as well on GNUstep.

Cheers
Fred


Quentin Mathé wrote:
> Le 13 janv. 04, à 21:01, Fred Kiefer a écrit :
>
> > Alexander Malmberg wrote:
> >
> > > However, the general idea was to add target and action. Adding a tag and
> > > a control view effectively turns NSImageCell completely into an
> > > NSActionCell, it isn't required to get dragging working, and it isn't in
> > > apple's docs (but then, target and action aren't, either).
> > > However, I think adding them now is the right thing to do. The cost
> > > (amount of code) is low, it makes NSImageCell more useful, and by adding
> > > all the stuff at once, we won't have to change the ivar layout/encoding
> > > format twice if it turns out that we want them later (eg. because apple
> > > really did add them, or will).
> >
> >
> > I don't see any benefit in this additional ivars. Also the main 
> > problem why there still is no patch for this is on a different level. 
> > What we need to decide is wether to implement the storing of target 
> > and action on the cell (as gets done by NSActionCell) or on the view 
> > (as done by NSMatrix and loads of others). Here only a test on a 
> > MacOSX system could show how Apple did introduce this partly 
> > documented feature.
> > But no one with a Mac system has commented on this up to now, that is 
> > why the problem may stay unresolved for some more time.
> > There is no abstract way of telling which way around it should be 
> > done. As both are in themselves valid.
> >
> > > Anyway, unless there are any other ideas about what to do about this,
> > > I'll commit this (with the above issues fixed) soon.
> >
> > No, please wait until this question gets answered. If we get the 
> > encoding wrong once, we will have to support it for ever!
>
>
> Here are the Mac OS X headers for NSImageView and NSImageCell :
>
> @interface NSImageView:NSControl
> {
>     char _editable;
>     id _target;
>     SEL _action;
> }
>
> @interface NSImageCell:NSCell <NSCopying, NSCoding>
> {
>     id _controlView;
>     struct __ICFlags _icFlags;
>     struct _NSImageCellAnimationState *_animationState;
>     NSImage *_scaledImage;
> }
>
> Hope that will help.
>
> Quentin.
>
> --
> Quentin Mathé
> qmathe@club-internet.fr