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add first draft of a mixin for text% objects that displays line numbers

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This commit is contained in:
Jon Rafkind 2010-11-01 17:35:16 -06:00
parent ea591c3c23
commit dc6350244d
2 changed files with 252 additions and 3 deletions
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2
collects/framework/private/sig.rkt
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@ -163,6 +163,7 @@
(define-signature text-class^
(basic<%>
first-line<%>
line-numbers<%>
foreground-color<%>
hide-caret/selection<%>
nbsp->space<%>
@ -199,6 +200,7 @@
basic-mixin
first-line-mixin
line-numbers-mixin
foreground-color-mixin
hide-caret/selection-mixin
nbsp->space-mixin

253
collects/framework/private/text.rkt
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@ -11,12 +11,13 @@ WARNING: printf is rebound in the body of the unit to always
scheme/class
scheme/match
scheme/path
"sig.ss"
"../gui-utils.ss"
"../preferences.ss"
"sig.rkt"
"../gui-utils.rkt"
"../preferences.rkt"
mred/mred-sig
mrlib/interactive-value-port
setup/dirs
racket/list
(prefix-in srfi1: srfi/1))
(require setup/xref
scribble/xref
@ -3696,3 +3697,249 @@ designates the character that triggers autocompletion
(define backup-autosave% (editor:backup-autosave-mixin clever-file-format%))
(define searching% (searching-mixin backup-autosave%))
(define info% (info-mixin (editor:info-mixin searching%)))
;; ============================================================
;; line number text%
(define line-numbers<%>
(interface () show-line-numbers!))
(define line-numbers-mixin
(mixin ((class->interface text%)) (line-numbers<%>)
(super-new)
(inherit get-visible-line-range
get-visible-position-range
find-position
line-start-position
line-end-position)
(define show-line-numbers? #t)
(define/public (show-line-numbers! what)
(set! show-line-numbers? what))
(define old-origin-x 0)
(define old-origin-y 0)
(define cached-snips (list))
(define need-to-recalculate-snips #f)
(define (get-style-font)
(let* ([style-list (send this get-style-list)]
[std (or (send style-list find-named-style "Standard")
#t
#;
(send style-list basic-style))])
(send std get-font)))
;; get the y position of a snip
(define (get-snip-y snip)
(define x (box 0))
(define y (box 0))
(send this get-snip-location snip x y)
(unbox y))
;; returns an ordered list of snip y positions
;; TODO: cache this list and update it incrementally
(define (snip-heights snip dc)
(define-struct snip-size (start end))
(define (get-size snip)
(define x (box 0))
(define y (box 0))
(send this get-snip-location snip x y)
(define width (box 0))
(define height (box 0))
(send snip get-extent dc (unbox x) (unbox y) width height)
(make-snip-size (unbox y) (+ (unbox y) (unbox height))))
;; size2 can be merged into size1
(define (can-merge? size1 size2)
(and (between (snip-size-start size1)
(snip-size-start size2)
(snip-size-end size1))
#;
(between (snip-size-start size1)
(snip-size-end size2)
(snip-size-end size1))))
(define (merge-sizes sizes)
(match sizes
[(list size1 size2 rest ...)
#;
(printf "Merge ~a,~a into ~a,~a?\n"
(snip-size-start size2) (snip-size-end size2)
(snip-size-start size1) (snip-size-end size1))
(if (can-merge? size1 size2)
(merge-sizes (cons size1 rest))
(cons size1 (merge-sizes (cons size2 rest))))]
[else sizes]))
(let loop ([all '()]
[snip snip])
(if snip
(loop (cons (get-size snip) all) (send snip next))
(map (lambda (size)
(snip-size-start size))
(merge-sizes (remove-duplicates
(sort (reverse all)
(lambda (a b)
(< (snip-size-start a)
(snip-size-start b)))))))))
#;
(let loop ([all '()]
[snip snip])
(if snip
(loop (cons snip all) (send snip next))
(remove-duplicates (sort (reverse (map get-snip-y all)) <)))))
(define (show-all-snips dc)
(define snip (send this find-first-snip))
(newline)
(define (next snip)
(when snip
(define x (box 0))
(define y (box 0))
(send this get-snip-location snip x y)
#;
(printf "Snip ~a at ~a,~a\n" snip (unbox x) (unbox y))
(next (send snip next))))
(next snip))
;; a <= b <= c
(define (between low what high)
(and (>= what low)
(<= what high)))
;; finds the first item in the sequence for which `ok?' returns true
(define (find-first sequence ok?)
(define-values (more? get) (sequence-generate sequence))
(let loop ()
(if (more?)
(if (ok? (get))
#t
(loop))
#f)))
;; true if the `y' location is within the positions specified by the
;; lines `start' and `end'
(define (ok-height y start end)
(define position (find-position 0 y))
;; this is why we need some `break' ability in for loops
(find-first (in-range start end)
(lambda (line)
(define low (line-start-position line))
(define high (line-end-position line))
(between low position high))))
(define/augment (on-insert start length)
(set! need-to-recalculate-snips #t))
(define (get-snip-heights dc)
(when need-to-recalculate-snips
(set! need-to-recalculate-snips #f)
(set! cached-snips (snip-heights (send this find-first-snip) dc)))
cached-snips)
(define (draw-line-numbers dc left top right bottom dx dy)
(define start-line (box 0))
(define end-line (box 0))
(get-visible-line-range start-line end-line #f)
(define start-position (box 0))
(define end-position (box 0))
#;
(get-visible-position-range start-line end-line)
(define (draw-text . args)
(send/apply dc draw-text args))
(define old-pen (send dc get-pen))
#;
(send dc set-font (send this get-font))
(send dc set-font (get-style-font))
(define-values (font-width font-height baseline space)
(send dc get-text-extent "a"))
#;
(printf "Style list ~a\n" (send this get-style-list))
#;
(printf "My height ~a text height ~a\n" font-height (text-height (send this get-dc) "a"))
(send dc set-text-foreground (make-object color% "black"))
#;
(send dc set-pen "red" 2 'solid)
#;
(send dc set-pen (send (send this get-dc) get-pen))
#;
(printf "First snip at ~a\n" (send this find-first-snip))
#;
(show-all-snips dc)
#;
(printf "Snip positions ~a\n" (snip-heights (send this find-first-snip) dc))
#;
(printf "Repaint from ~a to ~a dx ~a dy ~a visible ~a ~a\n" top bottom dx dy (unbox start-line) (unbox end-line))
#;
(printf "Snips ~a\n" (snip-heights (send this find-first-snip) dc))
(define heights (get-snip-heights dc))
(for ([y heights]
[line (in-naturals 1)])
#;
(printf "ok height? ~a ~a is ~a\n" y line (ok-height y (unbox start-line) (unbox end-line)))
(when (and (ok-height y (unbox start-line) (add1 (unbox end-line)))
(between top y bottom))
#;
(printf "~a at ~a\n" line (+ dy y))
(draw-text (number->string line) 0 (+ dy y))))
#;
(for ([i (in-range top bottom font-height)]
[y (snip-heights (send this find-first-snip) dc)]
[line (in-naturals 1)])
(define point (round (inexact->exact (/ i font-height))))
#;
(printf "Draw ~a at ~a\n" (add1 point) point)
(printf "y ~a top ~a bottom ~a dy ~a\n" y top bottom dy)
(when (and (>= y top)
(<= y bottom))
(draw-text (number->string (+ (unbox start-line) line))
0 (+ dy y)))
#;
(draw-text (number->string (+ (unbox start-line) (add1 point)))
0 place
#;
(+ dy (* point font-height))))
#;
(for ([i (in-range 0 (- (unbox end-line) (unbox start-line)))])
(draw-text (number->string (add1 i)) 0 (* i font-height)))
#;
(send dc set-pen old-pen)
#;
(define-values (line-x x1 x2 x3)
(send dc get-text-extent "10000"))
(define line-x (text-width dc "10000"))
(send dc draw-line line-x (+ dy top) line-x (+ dy bottom))
)
(define (text-width dc stuff)
(define-values (font-width font-height baseline space)
(send dc get-text-extent stuff))
font-width)
(define (text-height dc stuff)
(define-values (font-width height baseline space)
(send dc get-text-extent stuff))
height)
(define/override (on-paint before? dc left top right bottom dx dy draw-caret)
(when show-line-numbers?
(if before?
(let ()
;; save old origin and push it to the right a little bit
;; TODO: maybe allow the line numbers to be drawn on the right hand side?
(define-values (x y) (send dc get-origin))
(set! old-origin-x x)
(set! old-origin-y y)
#|
(define start (box 0))
(define end (box 0))
(get-visible-line-range start end)
|#
(define-values (font-width font-height baseline space)
(send dc get-text-extent "10000"))
(send dc set-origin (+ x (text-width dc "100000")) y))
(begin
(send dc set-origin old-origin-x old-origin-y)
(draw-line-numbers dc left top right bottom dx dy))))
(super on-paint before? dc left top right bottom dx dy draw-caret))
))