CheckBoxTreeItem behavior

[John Hendrikx]

Yeah, I didn't consider the other direction, that makes sense.

--John

On 18/11/2022 18:28, Nir Lisker wrote:
> I think that even if a node is set to indeterminate programmatically, 
> its parents should be updated at the very least (unless it's set to be 
> independent). Not updating the children seems reasonable.
>
> On Fri, Nov 18, 2022 at 11:12 AM John Hendrikx 
> <john.hendrikx at gmail.com> wrote:
>
>
>     On 18/11/2022 00:10, Nir Lisker wrote:
>     > Hi,
>     >
>     > I have been working on fixing some issues with the behavior
>     > of CheckBoxTreeItem. I stumbled across this situation:
>     >
>     > When a parent is de/selected, all of its children are set to the
>     same
>     > state. However, a CheckBoxTreeItem can be set to indeterminate
>     > programmatically (the control itself does not allow indeterminate).
>     > Should all children also be set to an indeterminate state? If
>     so, this
>     > will put the tree at an "invalid" state where leaf nodes can be
>     > indeterminate as well. OTOH, if not, then we are again at an
>     invalid
>     > state if all children have the same state, but the parent doesn't.
>
>     I think the indeterminate state is best left up completely to the
>     owner
>     of the control. You may need information that is not part of the
>     tree to
>     actually determine if something is indeterminate or not.  A tree
>     may be
>     filtered, or a tree may represent only "nodes" while "leaves" are
>     displayed in a 2nd control as a list.  This means that in theory,
>     parent
>     nodes could be indeterminate even if all its children are in the same
>     state (checked/unchecked) due to filtering, and leaf nodes could be
>     indeterminate if they represent a directory while the file
>     selection is
>     displayed in a separate control.  In Backup software, a directory
>     may be
>     partially selected if it has a filter associated with it (like
>     *.java)
>     even if that directory is empty or has only Java files currently...
>
>     Some UI's will even allow you to click on an indeterminate parent
>     node
>     to check it (checking all children), click again to uncheck it
>     (unchecked all children), and click a 3rd time to put it back to an
>     indeterminate state (restoring all children to the state they had
>     before
>     the first click).
>
>     --John
>
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