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
		general
			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				-					-
			move view left
				??				??						??					??
			move view right
				??				??						??					??
			move view up
				??				??						??					??
			move view down
				??				??						??					??

			center current image
				??				??						??					??

			zoom in
				+				pinch spread			-					-
			zoom out
				-				pinch closeup			-					-
			fit one
				1				tap current image		-					-

			toggle single image mode
				??				??						-					-
			toggle slideshow mode
				??				??						-					-

			keyboard help
			settings
		ribbon-specific
			fit three
				3				??						-					-
			broad view
				??				??						-					-
		single-specific
		
.
| vim:set spell :