Let's regard the TopView as a Toolbar with 2 states: collapsed and expanded.
Most of the time I want to set a precise value for my collapsed height (60dp), and for my expanded one (180dp).
For this I would need properties that are not related to the total height of the Coordinator:
TopViewHeightMin : set the minimum height of the top view in dp
TopViewHeightMax : set the maximum height of the top view in dp