Constraining the pointer within a rect

[Peter T. Evensen]

I think you are getting recursion.  Setting the screenMouseLoc causes 
mouseMove to be sent.  You might want to try locking messages before 
setting screenMouseLoc.

At 08:02 AM 8/17/2006, you wrote:
>>Greetings
>>
>>This is my annual mailing on this topic.  I won't bore you with why I 
>>need to do this deprecated act, but I do.
>>
>>Basically I need the pointer to refuse to move outside a rect, and just 
>>'bounce' against the edge.  No recoil or anything fancy, just stop until 
>>the user moves elsewhere with the rect.  I had a script that worked in a 
>>standalone in 1.1.1.  It was inelegant, but effectively.  It became 
>>painfully slow and jerky in 2.x.
>
>Hi David,
>basically, this modified version of the script works:
>
>on mouseMove X,Y
>   if the hilite of button "constrain" is true then
>     put the rect of fld "container" into  Fred
>     put min (item 3 of Fred , max (item 1 of Fred, X)) into X
>     put min (item 4 of Fred , max (item 2 of Fred, Y)) into Y
>
>     get the globalloc of (X,Y)
>     set the screenMouseLoc to it
>   end if
>end mouseMove
>
>
>but it is *incredibly* slow on OSX (not tried on Windows). I'm not quite 
>sure what it is that's slowing this down - does setting the ScreenMouseLoc 
>send a MouseMove message itself? There's bound to be a better way of doing 
>this?
>--
>Phil Jimmieson  phil at csc.liv.ac.uk  (UK) 0151 795 4236  (Mobile) 07976 983164
>Computer Science Dept., Liverpool University, Ashton Building, Ashton Street
>Liverpool L69 7ZF              http://www.csc.liv.ac.uk/~phil/
>   I used to sit on a special medical board... ...but now I use this ointment.
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Peter T. Evensen
http://www.PetersRoadToHealth.com
314-629-5248 or 888-682-4588