| Re: widget_problem [message #61589 is a reply to message #61467] |
Wed, 23 July 2008 07:01  |
d.poreh
Messages: 406
Registered: October 2007
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Senior Member |
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On Jul 22, 5:52 pm, d.po...@gmail.com wrote:
> On Jul 17, 8:32 pm, Paul van Delst <Paul.vanDe...@noaa.gov> wrote:
>
>
>
>> Justus Skorps wrote:
>>>> Justus
>>>> stil can not fix it. i have Liam E.Gumley's book but ......
>>>> Cheers
>>>> Dave
>
>>> after u load your arrays (lets call them A) store them with
>
>>> widget_control, event.top, set_uvalue=A, /nocopy
>
>>> You have to change 'event.top' that it fits your program...
>>> In your second button you can now load the arrays with
>
>>> widget_control, event.top, get_uvalue=A, /nocopy
>
>> but don't forget to put them back into your uvalue when you're done!
>
>>> It is useful to
>
>>> -store the data in the main widget
>>> -use a structure to store every data you want
>
>> I also tend to use procedures to get the Info state:
>
>> ; Routine to get the Info state
>> PRO GetState, ID, Info, No_Copy = No_Copy
>> ; -- Get pointer
>> WIDGET_CONTROL, ID, GET_UVALUE = InfoPtr
>> IF ( PTR_VALID( InfoPtr ) EQ 0 ) THEN $
>> MESSAGE, 'State Information pointer is invalid'
>
>> ; -- Get state information structure
>> IF ( N_ELEMENTS( *InfoPtr ) EQ 0 ) THEN $
>> MESSAGE, 'State information structure is undefined'
>> IF ( KEYWORD_SET( No_Copy ) ) THEN BEGIN
>> Info = TEMPORARY( *InfoPtr )
>> ENDIF ELSE BEGIN
>> Info = *InfoPtr
>> ENDELSE
>> IF ( Info.Debug EQ 1 ) THEN PRINT, 'GetState'
>> END
>
>> and to set the info state
>
>> ; Routine to set the Info state
>> PRO SetState, ID, Info, No_Copy = No_Copy
>> ; -- Get pointer
>> WIDGET_CONTROL, ID, GET_UVALUE = InfoPtr
>> IF ( PTR_VALID( InfoPtr ) EQ 0 ) THEN $
>> MESSAGE, 'State information pointer is invalid'
>
>> ; -- Set state information structure
>> IF ( N_ELEMENTS( Info ) EQ 0 ) THEN $
>> MESSAGE, 'State information structure is undefined'
>> IF ( KEYWORD_SET( No_Copy ) ) THEN BEGIN
>> *InfoPtr = TEMPORARY( Info )
>> ENDIF ELSE BEGIN
>> *InfoPtr = Info
>> ENDELSE
>> IF ( (*InfoPtr).Debug EQ 1 ) THEN PRINT, 'SetState'
>> END
>
>> My widget event handlers then do something like:
>
>> FUNCTION ComponentTest_LogLin_Event, Event
>> ; -- Get main info state
>> GetState, Event.Top, Info
>
>> ; -- Print debug statement if required
>> IF ( Info.Debug EQ 1 ) THEN PRINT, 'ComponentTest_LogLin_Event'
>> ; -- Set the selected variable number index
>> Info.LogLin_Index = Event.Value
>
>> ; -- Save info state
>> SetState, Event.Top, Info
>
>> ; -- Display the result
>> ComponentTest_Display, Event.Top
>> RETURN, 0
>> END
>
>> Note how I call GetState and then SetState. Because I tend not to use /no_copy, it's
>> really only an issue when I update a component of the info state (like in my example
>> above). But, if you *do* use /no_copy, then I think you have to call SetState again to
>> replace the info pointer.
>
>> cheers,
>
>> paulv
>
> Thanks Justus and Paulv
> You help me very much. And it was very useful.
> Cheers
> Dave
Hi Justus
I encounter a now problem:
Say I have set and get 2 arrays by this method:
widget_control, event.top, set_uvalue=A, /nocopy
…
widget_control, event.top, get_uvalue=A, /nocopy
and from another button:
widget_control, event.top, set_uvalue=B, /nocopy
…
widget_control, event.top, get_uvalue=B, /nocopy
Now I want to get both A&B in another button like this:
widget_control, event.top, get_uvalue=A, /nocopy
widget_control, event.top, get_uvalue=B, /nocopy
But widget just accepts one array. How I can take this two arrays
simultaneously in another button?
Any help?
Cheers
Dave
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