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Private GUI Callbacks and SKILL++

Curtisma

Hello:

I am trying to create a SKILL++ package that includes a form gui.  I setup a gui using a public function of the package.  My plan was to have the callback functions for the gui elements remain private as part of the package and then only make the function to create and open the gui public.  However when I try this I cannot get it to recognize the private functions.  Is there any way I can keep the callback functions private to the package and still run the gui?

I've tried several ways of specifying the callback function when creating the field.  These include trying a string call the private function, a symbol for it, and including the package name in the call. (packageName->selectFileCB) None have fixed the scope issue.

packageName = let(

...

procedure( createGui(L C V)

...

   hiCreateButton(
   ?name 'SelectFileButton
   ?buttonText "Browse"
   ?callback "SelectFileCB('hiGetCurrentForm())")

...

) ; procedure createGui

procedure( selectFileCB()

...

) ; procedure selectFileCB....

) ; let

list(nil 'createGui createGui))

Start Gui:

packageName->createGui()

Gui starts but the callbacks don't work.

Parents

  • The callbacks are evaluated in the global scope, so that's why it can't see your lexically scoped callback function. From IC617 onwards, you can specify most of the UI callbacks as function objects rather than a SKILL expression or the name of a function, so that allows you to pass the function object accessed via a lexical scope to be the callback - and then since the UI now has the function object, it will be called in the correct scope.

    Details on how to specify function objects as callbacks can be found in the Cadence User Interface SKILL Reference manual, in Chapter 1, in a section headed Function Object Callbacks.

    Here's a simple example I just put together based on your outline:

    ; ensure this is in a file with a .ils suffix
myPackage=let(()
  procedure(createGUI()
    hiDisplayForm(
      hiCreateAppForm(
	?name 'forumGUI
	?fields
          list(
            list(
              hiCreateStringField(
                ?name 'name 
                ?prompt "Name"
              )
              0:0 400:30 100)
            list(
              hiCreateButton(
                ?name 'button
                ?buttonText "Press me"
                ; pass the callback as a function object rather than
                ; the name of the function or a SKILL expression
                ?callback buttonCB
              )
              100:30 150:30)
          )
      )
    )
  )
  procedure(buttonCB(field scope)
    printf("Button pressed - field:%L scope:%L\n"
      field scope
    )
  )
  list(nil 'createGUI createGUI)
)

    Regards,

    Andrew.

  • in reply to Andrew Beckett

    Is there a way to make the deRegApp callbacks private?  Can I use a function object as the callback there also?

    -Curtis

Reply Children
  • in reply to Curtisma

    Curtisma said:

    Is there a way to make the deRegApp callbacks private?  Can I use a function object as the callback there also?

    Hi Curtis,

    No. These callbacks currently have to be specified as the symbol for the name of the function. There may well be an enhancement request to change this (I didn't check as I'm on vacation this week), but it would be worth you contacting customer support to request this.

    Regards,

    Andrew.

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