Subject: Re: selectivity From: "Henry S. Thompson" <ht@xxxxxxxxxxxxxxx> Date: Thu, 24 Apr 97 16:28:06 BST |
Geir Ove clarified his desires as follows: > I would like to simulate Viewport's VISIBLE property. What I hope I could > do is to put a label on all my element-rules that says 'hide', 'show' or > 'inherit'. > > If an element has been flagged 'hide', all of its content should be > discarded, except any subelements that have been flagged as 'show'. > > I would like to do something like this: > > . . . OK, that is indeed nice and simple, just like this (works in 0.5): ------------------------------- (root (make simple-page-sequence (make scroll content-map: '((show #f)) (sosofo-discard-labeled (make sequence (relabel)) 'hide)))) (element CHAPTER (hide)) (element (CHAPTER TITLE) (show)) (element SECTION (show)) (define (hide) (make sequence label: 'hide)) (define (show) (make paragraph label: 'show content-map: '((show #f)) (relabel))) (define (relabel) ;; note this only labels unlabeled members (sosofo-label (process-children) 'show)) ------------------------ Inheritance is the default, and we start out showing everything. If you only wanted (DOC TITLE) to show, but not other DOC daughters, you would need: (element DOC (hide)) and change (CHAPTER TITLE) to TITLE. Note the only real complexity is to deal with a subtle potential bug -- the 'relabel' procedure is necessary, or with the revised style as just described, (SECTION TITLE)'s would appear out of order. The reason for this is left as an exercise to the standard mavens :-). ht
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