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WSCROLL.MUT
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1992-04-27
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1KB
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42 lines
;; wscroll.mut : horzontal window scrolling
;; scroll-right, scroll-left
;; Manually scroll the current window horizontally.
;; Trys to keep the cursor on screen to prevent the update routines
;; from undoing the scroll.
;; cursor-is-right, cursor-is-left
;; Shift the window so that the cursor is at the right or left
;; margin (if possible).
;; center-screen-around-cursor-horizontally
;; C Durland Public Domain
(defun
scroll-right
{
(int n)
(window-ledge -1 (- (window-ledge -1) (arg-prefix)))
(n (+ (window-ledge -1)(screen-width)))
(if (>= (current-column) n) (current-column n))
}
scroll-left
{
(int n)
(n (window-ledge -1 (+ (window-ledge -1) (arg-prefix))))
(if (<= (current-column) n)(current-column (+ n 1)))
}
;; Shift the screen left so that the cursor is in the left most
;; visible column.
cursor-is-left { (window-ledge -1 (- (current-column) 2)) }
;; Shift the screen right so that the cursor is in the right most
;; visible column.
cursor-is-right { (window-ledge -1 (- (current-column) (screen-width) -1)) }
center-screen-around-cursor-horizontally
{ (window-ledge -1 (- (current-column) (/ (screen-width) 2))) }
MAIN
{
(bind-to-key "cursor-is-left" "C-x<")
(bind-to-key "cursor-is-right" "C-x>")
}
)