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Avoiding duplicate clears in edit-line, which cause unintended scroll up for multi-line inputs.

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This commit is contained in:
Alex Shinn 2014-05-05 16:31:49 +09:00
parent ce24f67224
commit bb54932b5a
1 changed files with 17 additions and 11 deletions
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18
lib/chibi/term/edit-line.scm
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@ -126,10 +126,11 @@
;; buffers
(define-record-type Buffer
(%make-buffer refresh? min pos row max-row col gap start width string
history complete? single-line?)
(%make-buffer refresh? cleared? min pos row max-row col gap start width
string history complete? single-line?)
buffer?
(refresh? buffer-refresh? buffer-refresh?-set!)
(cleared? buffer-cleared? buffer-cleared?-set!)
(min buffer-min buffer-min-set!)
(pos buffer-pos buffer-pos-set!)
(row buffer-row buffer-row-set!)
@ -148,7 +149,7 @@
(define default-buffer-width 80)
(define (make-buffer)
(%make-buffer #f 0 0 0 0 0 default-buffer-size 0 default-buffer-width
(%make-buffer #f #f 0 0 0 0 0 default-buffer-size 0 default-buffer-width
(make-string default-buffer-size) '() #f #f))
(define (buffer->string buf)
@ -362,12 +363,15 @@
(lp (+ i 1) row (+ col off)))))))))))
(define (buffer-clear buf out)
(cond
((not (buffer-cleared? buf))
;; goto start of input
(terminal-goto-col out 0)
(if (positive? (buffer-row buf))
(terminal-up out (buffer-row buf)))
;; clear below
(terminal-clear-below out))
(terminal-clear-below out)
(buffer-cleared?-set! buf #t))))
(define (buffer-draw buf out)
(let* ((gap (buffer-gap buf))
@ -398,7 +402,8 @@
(if (< (buffer-row buf) (buffer-max-row buf))
(terminal-up out (- (buffer-max-row buf) (buffer-row buf))))))
(terminal-goto-col out (buffer-col buf))
(flush-output out)))
(flush-output out)
(buffer-cleared?-set! buf #f)))
(define (buffer-refresh buf out)
(cond ((buffer-refresh? buf)
@ -449,7 +454,8 @@
;; fast path - append to end of buffer w/o wrapping to next line
(display x out)
(flush-output out)
(buffer-col-set! buf (+ (buffer-col buf) len)))
(buffer-col-set! buf (+ (buffer-col buf) len))
(buffer-cleared?-set! buf #f))
(else
(buffer-refresh?-set! buf #t)))))