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\version "2.19.21"
\header {
= "Use @code{define-event-class}, scheme engraver methods,
and grob creation methods to create a fully functional text spanner
in scheme."
}
#(define-event-class 'scheme-text-span-event 'span-event)
#(define (add-grob-definition grob-name grob-entry)
(let* ((meta-entry (assoc-get 'meta grob-entry))
(class (assoc-get 'class meta-entry))
(ifaces-entry (assoc-get 'interfaces meta-entry)))
(set-object-property! grob-name 'translation-type? ly:grob-properties?)
(set-object-property! grob-name 'is-grob? #t)
(set! ifaces-entry (append (case class
((Item) '(item-interface))
((Spanner) '(spanner-interface))
((Paper_column) '((item-interface
paper-column-interface)))
((System) '((system-interface
spanner-interface)))
(else '(unknown-interface)))
ifaces-entry))
(set! ifaces-entry (uniq-list (sort ifaces-entry symbol<?)))
(set! ifaces-entry (cons 'grob-interface ifaces-entry))
(set! meta-entry (assoc-set! meta-entry 'name grob-name))
(set! meta-entry (assoc-set! meta-entry 'interfaces
ifaces-entry))
(set! grob-entry (assoc-set! grob-entry 'meta meta-entry))
(set! all-grob-descriptions
(cons (cons grob-name grob-entry)
all-grob-descriptions))))
#(add-grob-definition
'SchemeTextSpanner
`(
(bound-details . ((left . ((Y . 0)
(padding . 0.25)
(attach-dir . ,LEFT)
))
(left-broken . ((end-on-note . #t)))
(right . ((Y . 0)
(padding . 0.25)
))
))
(dash-fraction . 0.2)
(dash-period . 3.0)
(direction . ,UP)
(font-shape . italic)
(left-bound-info . ,ly:line-spanner::calc-left-bound-info)
(outside-staff-priority . 350)
(right-bound-info . ,ly:line-spanner::calc-right-bound-info)
(staff-padding . 0.8)
(stencil . ,ly:line-spanner::print)
(style . dashed-line)
(meta . ((class . Spanner)
(interfaces . (font-interface
line-interface
line-spanner-interface
outside-staff-interface
side-position-interface))))))
#(define scheme-event-spanner-types
'(
(SchemeTextSpanEvent
. ((description . "Used to signal where scheme text spanner brackets
start and stop.")
(types . (scheme-text-span-event span-event event))
))
))
#(set!
scheme-event-spanner-types
(map (lambda (x)
(set-object-property! (car x)
'music-description
(cdr (assq 'description (cdr x))))
(let ((lst (cdr x)))
(set! lst (assoc-set! lst 'name (car x)))
(set! lst (assq-remove! lst 'description))
(hashq-set! music-name-to-property-table (car x) lst)
(cons (car x) lst)))
scheme-event-spanner-types))
#(set! music-descriptions
(append scheme-event-spanner-types music-descriptions))
#(set! music-descriptions
(sort music-descriptions alist<?))
#(define (add-bound-item spanner item)
(if (null? (ly:spanner-bound spanner LEFT))
(ly:spanner-set-bound! spanner LEFT item)
(ly:spanner-set-bound! spanner RIGHT item)))
#(define (axis-offset-symbol axis)
(if (eq? axis X) 'X-offset 'Y-offset))
#(define (set-axis! grob axis)
(if (not (number? (ly:grob-property grob 'side-axis)))
(begin
(set! (ly:grob-property grob 'side-axis) axis)
(ly:grob-chain-callback
grob
(if (eq? axis X)
ly:side-position-interface::x-aligned-side
side-position-interface::y-aligned-side)
(axis-offset-symbol axis)))))
schemeTextSpannerEngraver =
#(lambda (context)
(let ((span '())
(finished '())
(event-start '())
(event-stop '()))
(make-engraver
(listeners ((scheme-text-span-event engraver event)
(if (= START (ly:event-property event 'span-direction))
(set! event-start event)
(set! event-stop event))))
(acknowledgers ((note-column-interface engraver grob source-engraver)
(if (ly:spanner? span)
(begin
(ly:pointer-group-interface::add-grob span 'note-columns grob)
(add-bound-item span grob)))
(if (ly:spanner? finished)
(begin
(ly:pointer-group-interface::add-grob finished 'note-columns grob)
(add-bound-item finished grob)))))
((process-music trans)
(if (ly:stream-event? event-stop)
(if (null? span)
(ly:warning "You're trying to end a scheme text spanner but you haven't started one.")
(begin (set! finished span)
(ly:engraver-announce-end-grob trans finished event-start)
(set! span '())
(set! event-stop '()))))
(if (ly:stream-event? event-start)
(begin (set! span (ly:engraver-make-grob trans 'SchemeTextSpanner event-start))
(set-axis! span Y)
(set! event-start '()))))
((stop-translation-timestep trans)
(if (and (ly:spanner? span)
(null? (ly:spanner-bound span LEFT)))
(ly:spanner-set-bound! span LEFT
(ly:context-property context 'currentMusicalColumn)))
(if (ly:spanner? finished)
(begin
(if (null? (ly:spanner-bound finished RIGHT))
(ly:spanner-set-bound! finished RIGHT
(ly:context-property context 'currentMusicalColumn)))
(set! finished '())
(set! event-start '())
(set! event-stop '()))))
((finalize trans)
(if (ly:spanner? finished)
(begin
(if (null? (ly:spanner-bound finished RIGHT))
(ly:spanner-set-bound! finished RIGHT
(ly:context-property context 'currentMusicalColumn)))
(set! finished '())))
(if (ly:spanner? span)
(begin
(ly:warning "I think there's a dangling scheme text spanner :-(")
(ly:grob-suicide! span)
(set! span '())))))))
schemeTextSpannerStart =
#(make-span-event 'SchemeTextSpanEvent START)
schemeTextSpannerEnd =
#(make-span-event 'SchemeTextSpanEvent STOP)
\layout {
\context {
\Global
\grobdescriptions #all-grob-descriptions
}
\context {
\Voice
\consists \schemeTextSpannerEngraver
}
}
\relative {
a4 b\schemeTextSpannerStart c d |
\repeat unfold 20 { a4 b c d | }
a4 b c\schemeTextSpannerEnd d |
\override SchemeTextSpanner.to-barline = ##t
a4\schemeTextSpannerStart b d c |
\repeat unfold 20 { a4 b c d | }
a1\schemeTextSpannerEnd |
}
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