set_parent

Sets the parent for the element.

This is used internally and you should normally not call this. A Container will set the parent of its children in add and remove.

Note, if parent is not null, this must not already have a parent set. Therefore, if you wish to switch parents, you will need to call this function twice: first to set the parent to null, and then to the new parent.

If parent is not null, you must ensure it already has a (non-floating) reference to this before calling this.

Parameters:

this	A TimelineElement parent (nullable): New parent of this

Returns:

true if parent could be set for this.