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Resolved Disabling treeview doubleclick expand/collapse

  1. How-to
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  1. Troy Cowan
    Troy Cowan
  2. PowerBuilder
  3. Thursday, 4 August 2022 14:13 PM UTC

I would like to disable the normal expand/collapse behavior when doubleclicking on a treeview node. Is this possible?

If not, if I add code to the Doubleclicked event handler to "take over" the expand/collapse state, would this happen before or after the node expands/collapses "under the hood"?

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Responses (3)
Olan Knight
Olan Knight Accepted Answer Pending Moderation
  1. Thursday, 4 August 2022 18:53 PM UTC
  2. PowerBuilder
  3. # 1

Put code in the SelectionChanging event of the treeview in order to determine how to proceed, of IF you wish to proceed!

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Andreas Mykonios
Andreas Mykonios Accepted Answer Pending Moderation
  1. Thursday, 4 August 2022 14:21 PM UTC
  2. PowerBuilder
  3. # 2

If it's a treeview, then take a look to ItemExpanding event. Returning 1 prevents treeview from expanding.

Andreas.

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Andreas Mykonios
  1. Andreas Mykonios
  2. Thursday, 4 August 2022 14:27 PM UTC
And of course you do have also itemcollapsing event...

Andreas.
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Troy Cowan
  1. Troy Cowan
  2. Thursday, 4 August 2022 14:42 PM UTC
Yes, that is a step in the right direction. Unfortunately, it seems to be in effect not just for doubleclick, but for single clicking on the node's negative sign - not sure exactly what that is called, but the box to the left of the node's label that normally allows you to expand/collapse that node. For my purposes, I need to allow collapsing that way but not by doubleclicking. There isn't that context passed in to the event, but maybe I can figure it out somehow.
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Andreas Mykonios
  1. Andreas Mykonios
  2. Friday, 5 August 2022 07:06 AM UTC
What you should think is what is the difference between clicked and doubleclicked event. A single click will call only clicked event. But I believe that a doubleclick will call clicked and then doubleclicked event. So I'm not sure what you have in mind is possible.

Andreas.
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Chris Pollach @Appeon
Chris Pollach @Appeon Accepted Answer Pending Moderation
  1. Thursday, 4 August 2022 14:17 PM UTC
  2. PowerBuilder
  3. # 3

Hi Troy;

  Are you asking about doing this on a TreeView Control or a TreeView DataWindow?

Regards ... Chris 

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Troy Cowan
  1. Troy Cowan
  2. Thursday, 4 August 2022 14:24 PM UTC
Treeview Control
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