Learning a field's scroll when its scrollbar is released

[Ken Ray]

Alternatively you could use a "send in time" message at the beginning of scrollBarDrag that polls for the mouse state:

-- Script of the field

local sIsScrolling

on scrollbarDrag
    if sIsScrolling <> "true" then 
        put "true" into sIsScrolling
        send "CheckMouse" to me in 10 milliseconds
    end if
    :
end scrollbarDrag

on CheckMouse
    if the mouse is up then
        put false into sIsScrolling
        put the vScroll of me into tVScroll
        -- do your thing
    else
        send "CheckMouse" to me in 10 milliseconds
    end if
end CheckMouse


Ken

> On Feb 2, 2026, at 10:11 AM, Bob Sneidar via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> You can set a variable when the drag starts, then in an idle handler, check for the state of the variable and proceed accordingly. 
> 
> Bob S
> 
> 
>> On Feb 2, 2026, at 7:54 AM, Craig Newman via use-livecode <use-livecode at lists.runrev.com> wrote:
>> 
>> Sorry, I missed the part about doing this in a field. That message is not sent from a field, only from a scrollbar sort of control.
>> 
>> In fact, very little indeed is sent from the scrollbar of a field. It may be necessary to trap the 
>> mouseLeave” message from a transparent rectangular graphic overlying the scrollbar portion of the field. This may be a close as you can get to noticing the terminatiion of the scroll process, and it is not pretty.
>> 
>> Craig
>> 
>>> On Feb 1, 2026, at 5:29 PM, David Epstein via use-livecode <use-livecode at lists.runrev.com> wrote:
>>> 
>>> The scrollBarDrag message is sent while the mouse is down.  If I want to know when the drag has ended, I can trap mouseUp in a scrollbar control.  But this does not seem to work for a scrolling field.  Is there a good way to learn the vScroll of a field when the mouse on the field’s scrollbar has been released?
>>> 
>>> David Epstein
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