change default GUI callback

To change the callback, you should use hiChangeFormCallback(leCreateInstForm "yourNewCallback()") .

The underscore at the beginning of the property is a convention to indicate that it's private (we use a similar convention for function names too).

Andrew.

Andrew, thank you for your reply.

As far as I understand the hiChangeFormCallback sets _doneAction (and optionally _cancelAction) which are to be run when form submitted with OK button or whatever. So it is all right when you need to provide some values to a form, then do some processing and then execute an action. I need a bit different thing. I would like the values are re-calculated(re-set) each time I change cellName in the form. So I suppose I need to operate with this "cellName" field instead of the whole form.

Is it possible to change callback for a particular field of the form? I have tried

hiChangeFormCallback(leCreateInstForm~>cellName "yourNewCallback()") 

with no success.

 I continued my investigation. I played with whole form callback defined it according to Andrew's advice , but still do not see any effect even for this case. Simply no changes. Should I call some function which reloads something in order to apply a change?

Also , returning back to assigning a function to a form field - is it OK just to use "=" operator? because the  hiChangeFormCallback operates at a form level, i.e. it does not accept a field (e.g. leCreateInstForm->cellName) as a parameter.

Please help, I have no idea where to find an answer. The only reference guide I know is skuiref which seems not be too willing to give some info about adjusting built-in functionality. And I am stuck in the very beginning.

I misread your original question (didn't realise it was the form field callback you wanted to change). I just tried it, and it works fine:

procedure(myCB()
  printf("HERE I AM\n")
  leInstCellNameCB(leCreateInstForm->cellName->value)
)

leCreateInstForm->cellName->_callback="myCB()"

Then when I interact with the cellName field (and move the focus out of the field), it prints HERE I AM in the CIW, and then does the original callback.

With this particular form, I don't think changing the form callback (with hiChangeFormCallback()) has any effect, because it's an "options" form - associated with an enter function. So there's no OK or Apply on the form - it's merely a form to provide options when digitizing (i.e. clicking where you want the instance to be placed).

Regards,

Andrew.

 Andrew, I was able to make some progress with your advice, thank you.

Initially I was trying the method but failed probably due to syntax mistake or something.

Now I can tune up necessary values depending on the value in the field , so that part is great. I have already modified your simple callback to my needs and it works fine. Though I needed to place the leInstCellNameCB(leCreateInstForm->cellName->value) built-in callback in the end of the procedure to let my changes apply(not to be over written by the leInstCellNameCB function)

Now I have another problem that the form re-calculate all values each time it is called, i.e. there must be some another callback responsible for initial value calculations, but I can not identify which one it is.. Is there some reserved procedure or name for such function?

Also, I encounter problem that Cadence does not accept any changes in callbacks till I restart the whole session. Once callback is defined and bound to a form , it is not possible to change something in the callback procedure and watch results on the form. I wonder if there is a special function that "reset"a form or callbacks so that I could call it instead of restaring the whole session.

I found out that the form is called by leHiCreateInst() and it is probably the function that checks and sets all initial values for fields. Now that's the question how to modify it? 

One idea is to re-assign the function in this way:

 procedure(leHiCreateInst()

 leHiCreateInst();

_some_actions

)

And here is the system reply:

 *Error* def: function is write protected and cannot be redefined - leHiCreateInst

I don't really understand why you can't do that via the lib, cell, view field callbacks on the form? Why do you need to wrap the command somehow? It's not going to be easy, because there's an enterFunction being used here, and the form is only the options form for that.

Andrew

Andrew, yes I can attach callbacks to the fields, but each time the form is called it invokes some another procedure which reset all settings to defaults, e.g. deltaX, deltaY. So I guess I also have to redefine some another callback in order to have it initially calculated right way but I can't identify which one

What if you wrap it with a hiRegTimer call to update the deltas right after the form comes up? You would setup your bindkey for placing an instance like this:

hiRegTimer("myInstCallback()" 1) leHiCreateInst()

This would initiate your callback one tenth of a second after the form comes up.

Derek

Thanks Derek, your advice helped.

leCreateInstForm->cellName->_callback="_myCB()"

If I add the line into .cdsinit it fails due to  non existent layout window.

How can I add the line to Layout Editor startup script? I see there are plenty commands loaded when LE window invoked, so the question is where it's done.