58 lines
2.0 KiB
Scheme
58 lines
2.0 KiB
Scheme
(define-record-type select-line :select-line
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(really-make-select-line elements cursor-index num-cols)
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select-line?
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(elements select-line-elements)
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(cursor-index select-line-cursor-index set-select-line-cursor-index!)
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(num-cols select-line-num-cols))
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(define (make-select-line elements)
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(really-make-select-line elements 0 (length elements)))
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(define (select-line-key? key)
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(or (= key key-right)
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(= key key-left)))
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(define (select-line-handle-key-press! select-line key)
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(cond
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((= key key-right)
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(move-cursor-right! select-line))
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((= key key-left)
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(move-cursor-left! select-line))
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(else #f)))
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(define (move-cursor-left! select-line)
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(let ((old-col (select-line-cursor-index select-line)))
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(if (and (> old-col 0)
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(> (select-line-num-cols select-line) 1))
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(set-select-line-cursor-index! select-line (- old-col 1)))))
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(define (move-cursor-right! select-line)
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(let ((old-col (select-line-cursor-index select-line)))
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(if (< old-col (- (select-line-num-cols select-line) 1))
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(set-select-line-cursor-index! select-line (+ old-col 1)))))
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(define (paint-select-line select-line win result-buffer)
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(paint-select-line-at select-line 0 0 win result-buffer))
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(define (paint-select-line-at select-line x y win result-buffer)
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(let ((cursor-col (select-line-cursor-index select-line))
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(width (result-buffer-num-cols result-buffer)))
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(let lp ((elts (select-line-elements select-line))
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(i 0)
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(x x))
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(cond ((null? elts)
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(values))
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((= i cursor-col)
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(let ((new-x ((element-painter (car elts)) win x y width #t #f))) ; no marking for now
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(lp (cdr elts) (+ i 1) new-x)))
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(else
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(let ((new-x ((element-painter (car elts)) win x y width #f #f)))
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(lp (cdr elts) (+ i 1) new-x)))))))
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(define (select-line-selected-entry select-line)
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(element-value
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(list-ref (select-line-elements select-line)
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(select-line-cursor-index select-line))))
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