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Re: Generating events while a button is pressed [message #6234]

Wed, 15 May 1996 00:00

David Foster
Messages: 341
Registered: January 1996

Senior Member

Phil Williams <williams@irc.chmcc.org> wrote:
>
> 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 wrote a program to allow the user to display a series of
images in a window, one at a time, and scroll through them forward
and back. It's meant for MR medical images, so send me an email
if you'd like a copy ... it's written for a UNIX system, but it'd
be pretty easy to modify.

Basically what I did was to use little draw widgets as the "scroll
buttons". I put text in the draws to identify them. When you do
this (using /BUTTON_EVENTS of course, and set the�UVALUE of the
draw widgets to identify the events) you can use

cursor, x, y, /nowait, /device
if ( x eq -1 or !err eq 0 ) then begin
print, 'Button released'
return, 0
endif

This also lets you use all three mouse buttons, if you want to have
multiple scroll modes (by one, by page, etc).

Hope this helps.

Dave Foster
UCSD Brain Image Analysis Lab
foster@bial1.ucsd.edu

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[Message index]

		Re: Generating events while a button is pressed By: David Foster on Wed, 15 May 1996 00:00
		Re: Generating events while a button is pressed By: rivers on Tue, 14 May 1996 00:00
		Re: Generating events while a button is pressed By: rivers on Mon, 13 May 1996 00:00

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