| Re: Allowable parameters in event_pro? [message #34881] |
Mon, 28 April 2003 15:06 |
R.Bauer
Messages: 1424
Registered: November 1998
|
Senior Member |
|
|
Kevin M. Lausten wrote:
> I am attempting to run a widget_motion_event via a widget_control
> call. I need to pass a parameter, 'pointer' to the widget motion
> event. When I set the event_pro to 'read_pixel'(my event source code)
> without the parameter the program calls 'read_pixel' properly. When I
> attempt to include my parameter 'read_pixel, pointer', I get an error
> 'attempt to call undefined procedure/function' What am I doing wrong?
>
> widget_control, data, event_pro = 'read_pixel, pointer',
> Draw_motion_events = 1
>
> Thanks,
> Kevin
Dear Kevin,
you can't do this in this way.
event_pro is only a procedure call e.g.
widget_control, data, event_pro = 'read_pixel_event'
the event_pro itselfs in this example "read_pixel_event" is defined as
pro read_pixel_event,event
.
.
.
end
If you like to transport a value into this routine you can use every uvalue
of every widget. In most cases the uvalue of the top level base (TLB) is
used.
Here you can read it by a widget_control command
pro read_pixel_event,event
widget_control,event.top,get_uvalue=your_what_ever_value
.
.
end
But this must be defined by the base.
e.g. tlb=widget_base(uvalue=ptr_new(your_what_ever_value), ....)
best regards
Reimar
--
Forschungszentrum Juelich
email: R.Bauer@fz-juelich.de
http://www.fz-juelich.de/icg/icg-i/
============================================================ ======
a IDL library at ForschungsZentrum Juelich
http://www.fz-juelich.de/icg/icg-i/idl_icglib/idl_lib_intro. html
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
