This question is a follow up on: Open a pop up window that runs a calculation in loop until it is closed?
How can I open a pop up to show a picture of a triangle that rotates by
2 PI/100 around its center every
Pause[1/1000] seconds as long as the space bar is held down? Is this possible in mathematica? (An answer where it constantly rotates regardless of key strokes interests me too.) What I am trying to get at is that I would like to have a honest infinite while loop of regular commands sent to the pop up window that terminates only when the pop up is closed.
Maybe I should just stop simplifying and ask the actual case that I am eventually interested in. I want to display two images, one on top of the other and call an external function each loop. If the function gives back 1 one of the images jumps up and down, if the function returns 0, both images are static. How would one go about writing this?