messages to buttons when the mouse is already down

[David Vaughan]

Terry's suggested use of the idle handler will probably draw another 
response about 'avoid idle" but there are times like these when it is 
useful. What is needed is a better way to handle it. Under HyperCard I 
wrote a set of XCMDs/XFCNs to manage a "task space" efficiently and make 
it easy to add and remove tasks without the fiddles and inefficiency 
which grow when you try to script "on idle". I am busy at work at the 
moment but should be able to post some scripts this evening for doing it 
directly in Rev. Incidentally, "send message in <N ms>" is very useful 
but there are times when you just want to act in time complementary to 
the user's activity, rather than forcing the action at a given time, and 
idle can be useful for this if used sparingly. So, Michael, Terry's 
suggestion is good and if you'll give me a few hours I hope to give you 
a better way of doing it.

cheers
David

On Tuesday, January 22, 2002, at 10:03 , Terry Judd wrote:

>> I would like to track the movement of the mouse through an array of 
>> buttons by hilighting each button that the mouse (button already down) 
>> passes over. However, the mouseEnter, mouseMove, mouseWithin messages 
>> are only sent to the first button because that button receives the 
>> mouseDown event and is the target. Similarly the mouseControl function 
>> (yes, it took me a couple of tries to notice that it was a function 
>> and not a message!) only returns the target.
>>
>> How can I get the other buttons to hilight without requiring the user 
>> to click each individually?
>
> How about using an idle handler and checking whether the cursor is 
> within the rect of the individual buttons - or better still convert the 
> mouseloc to an integer reflecting a button position in the array - and 
> then set the hilite of the target button (and turn off the hilite of 
> any previous target).
>
> Terry...
>
>> --
>> Michael J. Lew
>>
>> Senior Lecturer
>> Department of Pharmacology
>> The University of Melbourne
>> Parkville 3010
>> Victoria
>> Australia
>>
>> Phone +613 8344 8304
>>
>> **
>> New email address: michaell at unimelb.edu.au
>> **
>> _______________________________________________
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>
>
> -- 
> ___________________________________________________________________________
> Dr Terry Judd
>
> Lecturer in Instructional Design / Multimedia Developer
> Biomedical Multimedia Unit
> Faculty of Medicine, Dentistry & Health Sciences
> The University of Melbourne
> Email: t.judd at bmu.unimelb.edu.au
> Phone: 03 9344 0187
> Fax: 03 9344 4998
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