Gets the row representing the parent for self.
That is the row that would need to be collapsed to make this row disappear.
If self is a row corresponding to the root model, null is returned.
The value returned by this function never changes until the row is removed from its model at which point it will forever return null.
The parent of self
Gets the row representing the parent for self.
That is the row that would need to be collapsed to make this row disappear.
If self is a row corresponding to the root model, null is returned.
The value returned by this function never changes until the row is removed from its model at which point it will forever return null.