Move forward and backward through slides using Mouse clicks on Left and Right arrows

Builder
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Keyboards can be set to register new presses only but mouse detection is done every frame. The way I normally deal with this is to add a minimum RT, to give time for the mouse button to be unpressed. e.g.

if mouse.isPressedIn(rightArrow) and t > .5:
     slideN +=1

The more sophisticated route would be to have a flag. The code would look something like:

if mouse.isPressedIn(rightArrow) and mouseDown == False:
     slideN +=1
     mouseDown = True
elif mouse.getPressed()[0] == False:
     mouseDown = False