At 11:14 AM +0200 5/6/00, Stefan Matthias Aust wrote:
>In my attempt to try to figure out how book morphs work (I'm sort of 
>lost here) I wondered what stacks might be.  You can make a page a 
>stack (whatever that means) but when you try to delete a card, you 
>get an DNU #deleteCard.  Does stacks really work already?
>
>bye


Hi, Stefan.

"Stacks" aren't really operational at present, though they "worked 
once" for a demo in 1998, and are currently being revived and made to 
work properly and generally.

The code you may have encountered in PasteUpMorph in category 
"stack/card" dates from a couple of years ago, when a brief demo was 
put together of a simple HyperCard-like system in Squeak.  The demo 
was fleshed out just well enough to illustrate one possible mapping 
between Hypercard and Squeak structures, and consisted of a simple, 
scriptable Rolodex, constructed of bare parts.

Though most the demo code is long gone, some of the support code (and 
structure) remains in PasteUpMorph and DataMorph.  It has been lying 
fallow, and not quite usable, all this time, just waiting for someone 
to pick up this thread at some later moment.

By coincidence, such a moment arrived for me just last month.  I'm 
not looking to ship anything in this area in 2.8-beta, but this is 
definitely a direction in which work is being done and clarity is 
emerging.

There's no reason why Squeak should not easily allow a user to do all 
the things one can do in HyperCard -- minus the brick walls, and with 
very little mechanism involved.

   -- Scott