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mode/document: Add scroll-half-page-{up,down} (C-d/C-u in vi-normal) #3718

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mode/document: Add scroll-half-page-{up,down} (C-d/C-u in vi-normal) #3718

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12 changes: 11 additions & 1 deletion source/mode/document.lisp
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Original file line number Diff line number Diff line change
Expand Up @@ -110,7 +110,9 @@ Important pieces of functionality are:
"pageup" 'scroll-page-up
"C-f" 'scroll-page-down
"space" 'scroll-page-down
"pagedown" 'scroll-page-down)))))
"pagedown" 'scroll-page-down
"C-d" 'scroll-half-page-down
"C-u" 'scroll-half-page-up)))))

(define-configuration document-buffer
((default-modes (cons 'document-mode %slot-value%))))
Expand Down Expand Up @@ -295,6 +297,14 @@ The amount scrolled is determined by the buffer's `horizontal-scroll-distance'."
(ps-eval (ps:chain window (scroll-by 0 (- (* (ps:lisp (page-scroll-ratio (current-buffer)))
(ps:@ window inner-height)))))))

(define-command scroll-half-page-down ()
"Scroll down by half a page height."
(ps-eval (ps:chain window (scroll-by 0 (/ (ps:@ window inner-height) 2)))))

(define-command scroll-half-page-up ()
"Scroll up by half a page height."
(ps-eval (ps:chain window (scroll-by 0 (- (/ (ps:@ window inner-height) 2))))))

(define-command zoom-page (&key (buffer (current-buffer)))
"Zoom in the current buffer."
(incf (ffi-buffer-zoom-ratio buffer) (zoom-ratio-step buffer)))
Expand Down