So if I have a button X with a mouseDown handler in a Group Y also with
a mouseDown handler and in my card script (or stack script) also have a
mouseDown handler
If I click on button X and I only want button X to handle the mouseDown,
I do not 'pass mouseDown' in the button X mouseDown handler
If I click on button X and I also want another mouseDown handler in the
message path - in addition to the one in button X - to do something in
response, then I need to 'pass mouseDown' in the button script. In this
example, a pass mouseDown in the button mouseDown handler passes the
message to the group that contains the button. If that group's mouseDown
handler also does a pass mouseDown, then the card or stack gets the
mouseDown as well. If they do not pass the message its stops there.
Richard Gaskin, at one point, had a really excellent diagram of the
LiveCode message hierarchy. If he sees this post and still has it
perhaps he could post a link to it.
On 12/10/2019 2:39 PM, Sannyasin Brahmanathaswami via use-livecode wrote:
So then to trap "the target" in the stack script, require putting
pass mousedown (or mouseWhatever)
in all the background groups (all of which contain their our MouseDown)
Correct?
remember the use case:
we do not want and script in *any* button or top object that receives a click or touch.
The card becomes a pure "view" object.
@paul
If you have groups where you need to pass a mouseDown (or mosueWhatever)
mesage to the card or stack, just add a behavior to the group for a
script that contain handlers like
on mouseDown
pass mouseDown
end mouseDown
on mouseUp
pass mouseUp
end mouseUp
Although if there is no handler for the mouse event it should pass to
the card and then the stack and then any library or backscripts and then
the engine.
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