Changing Transitions on slide layers

I have a custom navigation on my slides (prev, next).  If the user clicks next, the transition for the slide pushes right -->, then shows the next slide. 

What I'd like to do is have the transition reverse or push left <-- when the user clicks previous. 

Does anyone have any idea how to do this?  I wonder if there is a way to assign a trigger that basically states

  • If user is on slide #2 and clicks the previous button to return to slide #1, first
  • Check to see if  slide #1 has been visited if so (not sure if this is necessary, but maybe something to do with states?)
  • Hide the base layer 
  • Show the layer that will push left when timeline starts

Is this possible?

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