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change DrRacket to aviod rebuilding some menus unnecessarily

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This commit is contained in:
Matthew Flatt 2010-10-16 20:31:24 -06:00
parent cafc6d697e
commit cd1fb5bea9
1 changed files with 6 additions and 4 deletions
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10
collects/drracket/private/unit.rkt
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@ -3441,10 +3441,12 @@ module browser threading seems wrong.
(hash-set! capability-menu-items menu (cons this-one old-ones)))))
(define/private (update-items/capability menu)
(let ([new-items (begin '(get-items/capability menu)
(send menu get-items))])
(for-each (λ (i) (send i delete)) (send menu get-items))
(for-each (λ (i) (send i restore)) new-items)))
(let* ([old-items (send menu get-items)]
[new-items (begin '(get-items/capability menu)
old-items)])
(unless (equal? old-items new-items)
(for-each (λ (i) (send i delete)) old-items)
(for-each (λ (i) (send i restore)) new-items))))
(define/private (get-items/capability menu)
(let loop ([capability-items (reverse (hash-ref capability-menu-items menu '()))]
[all-items (send menu get-items)]