| Unable to get the user value of the top level base after a draw widget expose event [message #36173] |
Thu, 14 August 2003 04:58 |
Johan Marais
Messages: 7
Registered: July 2003
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Junior Member |
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I keep on getting behaviour that I do not understand and as far as I
understand it, should not happen. I use draw widgets and objects graphics
with the EXPOSE_EVENTS from the draw widgets enabled. Here is an example:
pro image_Expose, event
widget_control, event.top, get_uvalue = state, /no_copy
for i=0,7 do state.combWindow[i]->Draw, state.combView[i]
widget_control, event.top, set_uvalue = state, /no_copy
end
pro setThresOf, event
widget_control, event.top, get_uvalue = state, /no_copy
state.ThresOf = event.value
widget_control, event.top, set_uvalue = state, /no_copy
end
where image_Expose the event handler for the draw widget's expose event is.
After a call to image_expose has been made and when I try to get the user
value of the top level base, (for example in setThresOf) I receive the
following error message:
% Expression must be a structure in this context: STATE.
When I issued the help statement, I receive the following:
IDL> help, state, /STRUCT
STATE UNDEFINED = <Undefined>
It seems to me that the program are unable to get the top levels base user
value once an expose event was executed.
Did anyone ever come across this? I do not know whether any other part of
the program can have an influence as well.
--
Johan Marais
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