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Gigarom Macintosh Archives (Quantum Leap)(CDRM1080320)(1993).iso
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card_16013.txt
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1989-02-26
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2KB
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44 lines
-- card: 16013 from stack: in.0
-- bmap block id: 0
-- flags: 0000
-- background id: 3797
-- name:
-- part contents for background part 1
----- text -----
From: <BELSLEY%BCVMS.BITNET@MITVMA.MIT.EDU> (DAVID A. BELSLEY)
Date: Sat, 20 Feb 88 16:01 EST
It should be mentioned that the message posted in this digest several weeks
ago regarding simultaneous field scrolling rather misses the point. The
statement that was made (I forget the name of the author) was that fields
could be made to scroll together merely by a script that says "set the
scroll of field A to the scroll of field B", presumably running in a
handler for "idle."
This solution solves only the simplest and crudest needs of simultaneous
scrolling. First, the fields do not really scroll together; they scroll
in sequence. The first field moves, then, only after a mouseup, will the
second field catch up. If the second field is an index field, this staggered
behavior prevents one from knowing how far he has scrolled until it is too
late.
Second, this solution does not allow for selecting in the field beyond
the portion of the field showing in the window. If one attempts to select
beyond the scroll, the moment the mouse is let up, the second window
"catches us," and, in so doing, removes the selection from the first window.
Third, the same phenomenon besets the positioning of the insertion point
since the insertion point will be "removed" from the first window after
contol is given to the second window for its scroll to catch up.
In short, new control must be introduced into hypercard in order
properly to produce simultaneous scrolling of any sophistication; and I
will add, that many important uses of hypercard will be precluded by a lack
of such a facility. I can only hope that the creative powers that be in
the Atkinson fold will take this issue seriously.
-- part contents for background part 45
----- text -----
Simultaneous scrolling