Purdont/Texas ball hit rim, no shot clock reset-why?

[Nevadaref]

For the purpose of resetting the shot clock, is it considered a shot if the player never lets go of the ball?
For example, a player attempting a dunk, pins the ball against the rim and then comes back down with it.
Or what about a player who simply jumps and touches the ball to the rim and then returns to the floor?