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List Box Field Contents Not Updating

Pipahhhhhh

Hi there,

In the code below, I have a list box field and a button. When I press the button, I want it to add the string "Goodbye" to the list box in the GUI, but it doesn't. When I print a copy of myListBox~>choices though, the "choices" list has the updated contents in it. Why is this? I'm fairly sure that SKILL by default is pass by reference, so the callback procedure that I use should inevitably change the right list. I think I'm missing something fairly obvious here, but I can't figure it out for some reason.

Thanks in advance!

procedure( example()

myListBox = hiCreateListBoxField(
?name gensym( 'TheListBox )
?choices list( "Hello" )
)

myListBoxEntry = list( myListBox 25:25 100:100 )

myButton = hiCreateButton(
?name gensym( 'TheButton )
?callback "buttonCallback( myListBox )"
?buttonText "Turbo Encabulate"
)

myButtonEntry = list( myButton 150:20 125:125 )

myForm = hiCreateAppForm(
?name gensym( 'TheForm )
?fields list( myListBoxEntry myButtonEntry )
)

hiDisplayForm( myForm )

printf( "%L" myForm~>TheListBox~>choices )

)

procedure( buttonCallback( listBox )

printf( "%s%L" "\n\nBefore: " listBox~>choices )

listBox~>choices = cons( "Goodbye" listBox~>choices )

printf( "%s%L" "\n\nAfter: " listBox~>choices )


)

  • The issue is that you're passing the listBox structure without it being instantiated in the form and you really need that information for it all to work properly. Because the listBox field name itself is generated with a gensym, that complicates matters slightly - but it's pretty easy to get working - just pass the form and the generated field name to the callback function. This also has the benefit of not being dependent upon the form being blocking (in your current code, TheListBox is only in scope because the hiDisplayForm has blocked the code and so it can still see the variableTheListBox).

    procedure( example()

  myListBox = hiCreateListBoxField(
    ?name gensym( 'TheListBox )
    ?choices list( "Hello" )
  )

  myListBoxEntry = list( myListBox 25:25 100:100 )

  myButton = hiCreateButton(
    ?name gensym( 'TheButton )
    ?callback lsprintf("buttonCallback(hiGetCurrentForm() '%s )" myListBox->hiFieldSym)
    ?buttonText "Turbo Encabulate" 
  )

  myButtonEntry = list( myButton 150:20 125:125 )

  myForm = hiCreateAppForm(
    ?name gensym( 'TheForm ) 
    ?fields list( myListBoxEntry myButtonEntry ) 
  ) 

  hiDisplayForm( myForm )

; doesn't make sense since the field is not called TheListBox
;  printf( "%L" myForm~>TheListBox~>choices )

)

procedure( buttonCallback( form listBoxName )
  let((listBox)
    listBox=get(form listBoxName)
    printf( "%s%L" "\n\nBefore: " listBox~>choices )

    listBox~>choices = cons( "Goodbye" listBox~>choices )

    printf( "%s%L" "\n\nAfter: " listBox~>choices )

  )
)
  • in reply to Andrew Beckett

    That Was it! Thanks a lot Andrew! I've read a lot of your other posts too, and they've been super helpful to me in learning SKILL.

    All the best,

    Austin

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