[ CCode ( instance_pos = 1.9 ) ]
public delegate ListModel? TreeListModelCreateModelFunc (Object item)
Prototype of the function called to create new child models when set_expanded is called.
This function can return null to indicate that item is guaranteed to be a leaf node and
will never have children. If it does not have children but may get children later, it should return an empty model that is filled once
children arrive.
| item |
The item that is being expanded |
| user_data |
User data passed when registering the function |
|
The model tracking the children of |