Unexpected scrollbarDrag message
alex at tweedly.net
Wed May 22 20:13:44 EDT 2013
I think it's behaving as intended (however strange that may be).
Note - there is no need to have any scrollbars anywhere to have
scrollbardrag messages generated.
The key part (in the docs) is perhaps
> Sent to a field, scrollbar, or group when the user drags the scrollbar
> thumb or when a text selection causes a field to scroll.
Create a new stack, card with only one field (no scrollbar associated
with it), and add some suitable script to the card, like
put "drag" && the millisecs &CR after msg
and click in the field - nothing happens.
But either typing a CR into the field, or enough chars to cause a
horizontal shift, and a scrollbardrag message is generated.
Then make the field very slightly less tall - and now simply clicking in
the field causes a tiny scroll because the insertion cursor is being put
in the field. And that generates a 'scrollbardrag' which is picked up by
the handler in the card script. I prsume that because it is generated
*from* the field, it wouldn't be seen by a handler attached to the field
itself (to avoid possible recursion ??)
On 22/05/2013 23:32, Peter Haworth wrote:
> I have a card with a number of slider scrollbars on it and a scrollbarDrag
> handler in the card script to deal what happens when any of the sliders are
> moved. I also have a field associated with each scrollbar which receives
> the thumbpos of its associated slider. All that works fine
> However, if I click into the slider value field, my card level
> scrollbardrag message is triggered with a value of 1. I also see that the
> message is coming from the value field.
> If I get rid of the scrollbardrag message at the card level and put it into
> the script of each individual slider, the problem goes away. If I put a
> scrollbardrag handler into the script of the value fields, it is triggered
> as soon as I click into the field.
> The value fields do not have any scrollbars enabled, do not have a behavior
> script, and there are no other scripts in the messagepath between them and
> the card.
> I'm sure this is not an intended behavior?
> lcSQL Software <http://www.lcsql.com>
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