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put on-to-scroll callbacks in a refresh sequence

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Avoid flickering for the "#lang" line and documentation
wedge in DrRacket, for example.
This commit is contained in:
Matthew Flatt 2015-12-19 07:54:30 -07:00
parent 1944cd8dbd
commit 446df9e047
1 changed files with 12 additions and 5 deletions
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17
gui-lib/mred/private/wxme/editor-canvas.rkt
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@ -964,6 +964,7 @@
(when (not fake-x-scroll?)
(when scroll-via-copy?
(set! on-scroll-to-called? #t)
(begin-refresh-sequence)
(when scroll-via-copy? (when ed (send ed on-scroll-to))))
(set-scroll-pos 'horizontal x))
#t))))
@ -977,6 +978,7 @@
(unless on-scroll-to-called?
(when scroll-via-copy?
(set! on-scroll-to-called? #t)
(begin-refresh-sequence)
(when ed (send ed on-scroll-to))))
(set-scroll-pos 'vertical y))
#t))))))
@ -1005,7 +1007,8 @@
(old-fy . < . (+ new-fy vh))
(integer? (send (get-dc) get-backing-scale)))
(let ([dc (get-dc)])
(begin-refresh-sequence)
(unless on-scroll-to-called?
(begin-refresh-sequence))
(send dc copy
xmargin ymargin
vw (- (+ new-fy vh) old-fy)
@ -1013,12 +1016,14 @@
(redraw vx vy
vw (- old-fy new-fy)
#t)
(end-refresh-sequence))]
(unless on-scroll-to-called?
(end-refresh-sequence)))]
[(and (old-fy . < . new-fy)
(new-fy . < . (+ old-fy vh))
(integer? (send (get-dc) get-backing-scale)))
(let ([dc (get-dc)])
(begin-refresh-sequence)
(unless on-scroll-to-called?
(begin-refresh-sequence))
(send dc copy
xmargin (+ ymargin (- new-fy old-fy))
vw (- (+ old-fy vh) new-fy)
@ -1027,12 +1032,14 @@
(redraw vx (+ vy d)
vw (- vh d)
#t))
(end-refresh-sequence))]
(unless on-scroll-to-called?
(end-refresh-sequence)))]
[else (repaint)])))
(repaint)))
(when on-scroll-to-called?
(when ed (send ed after-scroll-to)))))
(when ed (send ed after-scroll-to))
(end-refresh-sequence))))
(define/override (set-scrollbars x y x2 y2 x3 y3 x4 y4 ?) (void))