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save/restore dc state while drawing line numbers

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This commit is contained in:
Jon Rafkind 2010-11-14 19:44:42 -07:00
parent cd4e5e7410
commit ee62bae74b
1 changed files with 19 additions and 2 deletions
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21
collects/framework/private/text.rkt
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@ -3756,6 +3756,17 @@ designates the character that triggers autocompletion
(and (>= what low) (and (>= what low)
(<= what high))) (<= what high)))
(define-struct saved-dc-state (pen font foreground-color))
(define (save-dc-state dc)
(saved-dc-state (send dc get-pen)
(send dc get-font)
(send dc get-text-foreground)))
(define (restore-dc-state dc dc-state)
(send dc set-pen (saved-dc-state-pen dc-state))
(send dc set-font (saved-dc-state-font dc-state))
(send dc set-text-foreground (saved-dc-state-foreground-color dc-state)))
;; set the dc stuff to values we want ;; set the dc stuff to values we want
(define (setup-dc dc) (define (setup-dc dc)
(send dc set-pen "black" 1 'solid) (send dc set-pen "black" 1 'solid)
@ -3859,6 +3870,7 @@ designates the character that triggers autocompletion
(define (draw-separator dc top bottom dx dy x) (define (draw-separator dc top bottom dx dy x)
(send dc draw-line (+ dx x) (+ dy top) (+ dx x) (+ dy bottom))) (send dc draw-line (+ dx x) (+ dy top) (+ dx x) (+ dy bottom)))
;; `line-numbers-space' will get mutated in the `on-paint' method
(define line-numbers-space 0) (define line-numbers-space 0)
(define/override (find-position x y . args) (define/override (find-position x y . args)
;; adjust x position to account for line numbers ;; adjust x position to account for line numbers
@ -3867,6 +3879,7 @@ designates the character that triggers autocompletion
(super find-position x y . args))) (super find-position x y . args)))
(define (draw-line-numbers dc left top right bottom dx dy) (define (draw-line-numbers dc left top right bottom dx dy)
(define saved-dc (save-dc-state dc))
(setup-dc dc) (setup-dc dc)
(define start-line (box 0)) (define start-line (box 0))
(define end-line (box 0)) (define end-line (box 0))
@ -3874,7 +3887,8 @@ designates the character that triggers autocompletion
;; draw it! ;; draw it!
(draw-numbers dc top bottom dx dy (unbox start-line) (add1 (unbox end-line))) (draw-numbers dc top bottom dx dy (unbox start-line) (add1 (unbox end-line)))
(draw-separator dc top bottom dx dy (text-width dc (number-space)))) (draw-separator dc top bottom dx dy (text-width dc (number-space)))
(restore-dc-state dc saved-dc))
(define (text-width dc stuff) (define (text-width dc stuff)
(define-values (font-width font-height baseline space) (define-values (font-width font-height baseline space)
@ -3897,14 +3911,17 @@ designates the character that triggers autocompletion
;; will probably go away when 'margin's are added to editors ;; will probably go away when 'margin's are added to editors
;; ;;
;; save old origin and push it to the right a little bit ;; save old origin and push it to the right a little bit
;; TODO: maybe allow the line numbers to be drawn on the right hand side? ;; TODO: maybe allow the line numbers to be drawn on the right hand side
;; of the editor?
(define-values (x y) (send dc get-origin)) (define-values (x y) (send dc get-origin))
(set! old-origin-x x) (set! old-origin-x x)
(set! old-origin-y y) (set! old-origin-y y)
(set! old-clipping (send dc get-clipping-region)) (set! old-clipping (send dc get-clipping-region))
(define saved-dc (save-dc-state dc))
(setup-dc dc) (setup-dc dc)
(define-values (font-width font-height baseline space) (define-values (font-width font-height baseline space)
(send dc get-text-extent (number-space))) (send dc get-text-extent (number-space)))
(restore-dc-state dc saved-dc)
(define clipped (make-object region% dc)) (define clipped (make-object region% dc))
(define all (make-object region% dc)) (define all (make-object region% dc))
(define copy (make-object region% dc)) (define copy (make-object region% dc))