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enable scoll via copy

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This commit is contained in:
Matthew Flatt 2015-11-25 05:07:44 -07:00
parent 33395ae1cf
commit bdac2da540
1 changed files with 7 additions and 3 deletions
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10
gui-lib/mred/private/wxme/editor-canvas.rkt
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@ -157,6 +157,8 @@
(define (keep-style l s) (if (memq s l) (list s) null))
(define SCROLL-VIA-COPY? #t)
(defclass editor-canvas% canvas%
(inherit refresh get-canvas-background get-dc
@ -971,7 +973,7 @@
(set! noloop? savenoloop?)
(when (and change? refresh?)
(if (and #f ;; special scrolling disabled: not faster with Cocoa, broken for Windows
(if (and SCROLL-VIA-COPY?
(not need-refresh?)
(not lazy-refresh?)
(get-canvas-background)
@ -986,7 +988,8 @@
(get-view vx vy vw vh) ; editor coords
(cond
[(and (new-fy . < . old-fy)
(old-fy . < . (+ new-fy vh)))
(old-fy . < . (+ new-fy vh))
(integer? (send (get-dc) get-backing-scale)))
(let ([dc (get-dc)])
(begin-refresh-sequence)
(send dc copy
@ -998,7 +1001,8 @@
#t)
(end-refresh-sequence))]
[(and (old-fy . < . new-fy)
(new-fy . < . (+ old-fy vh)))
(new-fy . < . (+ old-fy vh))
(integer? (send (get-dc) get-backing-scale)))
(let ([dc (get-dc)])
(begin-refresh-sequence)
(send dc copy