| Re: Generating events while a button is pressed [message #6245 is a reply to message #6234] |
Tue, 14 May 1996 00:00   |
rivers
Messages: 228
Registered: March 1991
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Senior Member |
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In article <DrCKAz.B65@midway.uchicago.edu>, rivers@cars3.uchicago.edu (Mark Rivers) writes:
> In article <31973A26.167E@irc.chmcc.org>, Phil Williams <williams@irc.chmcc.org> writes:
>> I hope someone out there can give me a hand with this one.
>>
>> I want to have a widget_button that generates events while the button
>> remains pressed (sorta like the action of DRAG on a widget_slider) so
>> that I can scroll through a stack of data, say.
>
> I can think of one way to do it:
>
> 1) Detect button press event, program enters "scroll mode"
> 2) Set a timer widget for a fraction of a second. On every timer widget
> event do your "scroll" action, and set the timer widget again.
> 3) On button release event, cancel timer event and exit "scroll mode".
My response above was incorrect, because normal buttons can only generate
button press events, not release events. Exclusive or non-exclusive buttons
can generate both press and release, but the "release" requires a second mouse
click, so this is not what Phil wanted.
I did manage to achieve what Phil wants to do using small draw widgets, rather
than button widgets. Draw widgets can detect both press and release events.
____________________________________________________________
Mark Rivers (312) 702-2279 (office)
CARS (312) 702-9951 (secretary)
Univ. of Chicago (312) 702-5454 (FAX)
5640 S. Ellis Ave. (708) 922-0499 (home)
Chicago, IL 60637 rivers@cars3.uchicago.edu (Internet)
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