It doesn't seem logical to expect a "doScrollUpStuff" handler to also
manage all other keystrokes. One would expect the original rawKeyDown
handler to manage non-scroll keys by passing them to the engine.
If the intent is to block all keys except those used for scrolling, then
Craig's way would work. The method chosen depends on where the handler
resides; other keys may not be applicable in a field script where the
field is locked. If the handler is in a card or stack script, then
passing other keystrokes is usually necessary.
On 12/23/16 3:47 PM, hh wrote:
What you say is logically totally wrong.
"DoScrollUpStuff" may of course easily be written such that Craig's
script does the same as your script. And even more, for example
reader's exercises :-))
Quentin L. wrote:
sez dunbarx:
The "rawkeyDown" message may be trapped as follows:
on rawkeydown tkey
if tkey = 65308 then doScrollDownStuff
else doScrollUpStuff
end rawkeydown
Hold it. That code, as written, will trap *A*L*L* rawKeyDown
events, and silently kill everything that's *not* a scrollwheel-down
event. Which, in turn, means that text input is toast, among other
probably-unwanted side-effects. Try something like this instead:
on rawKeyDown DerKey
switch DerKey
case 65308
DoScrollDownStuff
break
case 65309
DoScrollUpStuff
break
default
pass rawKeyDown
end switch
end rawKeyDown
Note that with the switch structure I've used here, there are a
number of perhaps-useful tricks you can pull… but said tricks are
strictly outside the scope of the original "how do I detect
scrollwheel activity?" problem, so I will leave said tricks as
exercises for the reader.
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Jacqueline Landman Gay | jac...@hyperactivesw.com
HyperActive Software | http://www.hyperactivesw.com
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