On 08/16/2012 06:17 PM, ro...@racket-lang.org wrote:
01e7ede Robby Findler <ro...@racket-lang.org> 2012-08-16 19:15 : | some performance improvements for the new drracket blueboxes | specifically, it doesn't trigger redrawing of the screen | as aggressively, which seems to make a little difference | under mac os x. | | I'd have liked to be more sophisticated in the way redraws | are triggered, but I don't see how (see long comment in this | commit for details)
> > ... >
+ (define/private (invalidate-blue-box-region) + (define c (get-canvas)) + (when c (send c refresh)) + ;; the code below is what I'd like to do here, + ;; but this doesn't redraw the margin (the part + ;; of the editor-canvas that is always outside + ;; of th editor) and it doesn't seem possible to + ;; trigger a redraw of that part without also + ;; triggering a redraw of the entire editor + ;; so we just do that instead (above) + + #; + (begin + (define-values (br bt _1 _2) (get-box-upper-right-and-lock-coordinates)) + (when (and bt br) + (cond + [(get-show-docs?) + (define-values (box-width box-height label-overlap?) + (get-blue-box-size (get-dc) (get-style-list) the-strs)) + (define x (- br box-width shadow-size)) + (invalidate-bitmap-cache (max x 0) + (max bt 0) + (+ box-width shadow-size) + (+ box-height shadow-size))] + [the-strs + (define size (+ corner-radius shadow-size)) + (invalidate-bitmap-cache (max 0 (- br size)) (max 0 bt) size size)]))))
Is there a way to invalidate just one part of a GUI element? I'd have liked having that recently on a little game I made. All I could find was `refresh', which doesn't take parameters. I didn't like having to redraw the entire board whenever a single piece was moved.
Neil ⊥ _________________________ Racket Developers list: http://lists.racket-lang.org/dev
