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Resolved Executing event inside (tab > tabpage > datawindow)

  1. How-to
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  1. Pau Haro
    Pau Haro
  2. PowerBuilder
  3. Friday, 17 July 2020 15:04 PM UTC

Hello,

Im trying to execute an event on a window, but the problem comes when I try to do it on a itemchanged event of a datawindow that is located into a tabpage that it's on a tab. I can't reference the window by his name, becouse I open the window like this (Open(window_parent, "window_name")) and PowerBuilder don't know that I already opened the window and throws me (Null object reference error). 

 

I need something like Parent.Parent.Parent, I don't want to use an instance variable to reference the window and I know that I can do a function on the window that triggers the event but I want to avoid that.

 

Thanks.

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Accepted Answer
John Fauss
John Fauss Accepted Answer Pending Moderation
  1. Friday, 17 July 2020 15:45 PM UTC
  2. PowerBuilder
  3. # Permalink

As Chris describes, here is code from an example function (from the PFC's ancestor DW control, pfc_u_dw):

// Function of_GetParentWindow( ref window aw_parent) returns integer

PowerObject lpo_parent

lpo_parent = This.GetParent()

// Loop getting the parent of the object until it is of type window!
Do While IsValid(lpo_parent)
   If lpo_parent.TypeOf() <> window! Then
      lpo_parent = lpo_parent.GetParent()
   Else
      Exit
   End If
Loop

If IsNull(lpo_parent) Or Not IsValid(lpo_parent) Then
   SetNull(aw_parent)
   Return -1
End If

aw_parent = lpo_parent
Return 1

HTH, John

Comment
Pau Haro
  1. Pau Haro
  2. Friday, 17 July 2020 15:48 PM UTC
Thanks for the code and for the help Jhon.



Regards.
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Responses (2)
Chris Pollach @Appeon
Chris Pollach @Appeon Accepted Answer Pending Moderation
  1. Friday, 17 July 2020 15:29 PM UTC
  2. PowerBuilder
  3. # 1

Hi Pau;

  You need to use the GetParent() command and the Typeof() command in a loop. The GetParent will get you to the next parent up the Parent/Child chain and typeof will let you know if its a Window. If not a Window class, then continue the loop until you find the Window class at the top of the Parent/Child chain.

HTH

Regards ... Chris

Comment
Pau Haro
  1. Pau Haro
  2. Friday, 17 July 2020 15:50 PM UTC
Thanks for the help Chris, It worked pretty nice.



Regards.
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Chris Pollach @Appeon
  1. Chris Pollach @Appeon
  2. Friday, 17 July 2020 16:01 PM UTC
Hi Pau .. that's awesome! :-)
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