Sorting children in TreeEditor?

[Daniel Farrell]

Hello,

It is possible to sort the child order in TreeEditor?

The example here is very similar to my actual code,

https://github.com/enthought/traitsui/blob/main/traitsui/examples/demo/Standard_Editors/TreeEditor_demo.py

For example, sorting the employees list by `name` or `title`?

Dan

[Corran Webster]

Hi Dan,

it's not supported out of the box, but you can implement it in one of two ways:

• sorting things in the model (eg. having a trait that holds the sorted values and updates when either the list of children updates or the sort key updates; and use that as the children for the TreeNode)
• implementing a TreeNode subclass so that it's get_children returns a sorted list (or, possibly, using one of the other ways of defining nodes as discussed here: in the TreeNode documentation)

The level of complexity will depend on how dynamic your tree is: if you need to support things like drag and drop on the tree it will be more complex, but if you are just displaying a static tree structure, or one which changes only occasionally, it should be fairly straight-forward.

Hope this helps,

-- Corran

[Daniel Farrell]

Hi Corran,

Thanks again! 

I will explore `get_children`, that route seems very promising.

Dan