Red [
	title: "Iterated faces in Red"
	file: %iterated-faces.red
	author: "Marco Antoniazzi"
	license: "Do with this code whatever you want, giving credit to me is NOT required"
	email: [luce80 AT alice DOT it]
	date: 13-01-2018
	version: 0.0.6
	Purpose: "Create iterated faces as those found in Rebol View"
	Needs: View
]

	iter-func: func [
		iterated-face [object!]
		index [integer! pair!]
		][
		; RETURNS: face, index number, or none
		; if index is integer! return face
		; if index is pair! return iteration number
		?? index
		either integer? index [
			; Draw needs to know offset and text:
			iterated-face/offset/y: index - 1 * (iterated-face/size/y)
			if iterated-face/offset/y > iterated-face/parent/size/y [return none]
			iterated-face/text: form iterated-face/offset
			iterated-face/color: either iterated-face/extra/selected = index [blue] [red]
			return iterated-face
		][
			; Events need to know iteration number:
			return to-integer index/y / (iterated-face/size/y) + 1
		]
		none
	]

	call_and_draw_iters: func[
	    ;itering-func	[function!] ; using functions is currently problematic
		itering-face	[object!]
		image		    [image!]
		/local
			draw-blk index current-face
		][
		draw-blk: [image 0 0x0 10x10]

		index: 1
		while [current-face: iter-func itering-face index ] [
			index: index + 1

			draw-blk/2: to-image current-face
			draw-blk/3: current-face/offset
			draw-blk/4: current-face/offset + current-face/size
			draw image draw-blk
		]
		image
	]

view compose [
	below space 4x4
	text "Select a line by clicking on it"
	panel [
		below
	    canvas: image 300x190 green all-over
			on-over [
				probe iter-func line-text event/offset
			]
			on-down [
				line-text/extra/selected: iter-func line-text event/offset
				call_and_draw_iters line-text face/image
			]
		line-text: text "abcd" red yellow hidden extra object [selected: false]
	] on-created [
			call_and_draw_iters line-text canvas/image
		]
]