Design criteria:
	organize profiles by workflow
	minimize number of actions to do main task within a workflow 
		target: 1:1 or less
	minimize finger movement within a workflow 
		target: no movement
		| i.e. all buttons are under the relaxed position of fingers on device
	minimize screen touching/contamination within image area 
		target: keep screen clean
		| i.e. buttons cover all the workflow actions
Control scheme:
|   device
|   	mode	
|   		action
|   			keyboard		gesture					button (tablet)		button (desktop)
	tablet / phone / desktop
		single
		ribbon
			focus image
				--				tap/click				-					-
			left image
				left			swipe right				+					-
			right image
				right			swipe left				+					-
			up image
				up				-- (via focus image)	-					-
			down image
				down			-- (via focus image)	-					-
			first image
				home			--						-					-
			last image
				end				--						-					-

			shift up
				s-up			swipe up				+					-
			shift down
				s-down			swipe down				+					-
			shift up, new ribbon
				c-s-up			??						??					??
			shift down, new ribbon
				c-s-down		??						??					??

			drag view
				??				tap-drag				-					-
			center current image
				??				??						??					??

			zoom in
				+				pinch spread			-					-
			zoom out
				-				pinch closeup			-					-
			fit one
				1				tap current image		-					-
			fit three
				3				??						-					-
			broad view
				??				??						-					-

			toggle single image mode
				??				??						-					-
			toggle slideshow mode
				??				??						-					-
		
.
| vim:set spell :