* Expose/hide gesture: you can reveal/hide the Frame by the swipe in/out gesture, revealing would be a gesture over the frame are into the center and the other way around, will likely collide when you sketch at the edge in the Paint activity for example
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* Expose/hide gesture: reveal/hide the Frame by a swipe in/out gesture, revealing would be a gesture over the frame area into the center and the other way around to hide, will collide when you sketch at the edge of the Paint activity if the gesture is not carefully tuned (a swip, not slow drag, of short length perpendicular to frame edge, diagonal at corners).