[plt-scheme] pasteboard insert/delete

From: Matthew Flatt (mflatt at cs.utah.edu)
Date: Sat Nov 16 18:51:57 EST 2002

At Sat, 16 Nov 2002 18:03:44 -0500, "Mike T. Machenry" wrote:
> I am having a problem hiding snips in a pasteboard. The class I am using
> is derived from pasteboard% with snip% fields. I am attempting to hide
> and show snips by deleting the an inserting them back again but the
> second insert doesn't seem to be working. The bellow program demonstrate
> this problem. The snip is supposed to reappear after the second call to
> insert but it does not. Is there a proper way to do this?

Probably you need to use `release-snip' instead of `delete'.

I'll fix the docs for `delete', etc. The short explanation is that
`delete' tends to put the snip into the undo stack, so the snip remains
owned by the pasteboard. The second insert then has no effect because
the snip is already owned.


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