diff options
Diffstat (limited to 'lisp')
| -rw-r--r-- | lisp/image-mode.el | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/lisp/image-mode.el b/lisp/image-mode.el index ce56208c6df..4a7178d18af 100644 --- a/lisp/image-mode.el +++ b/lisp/image-mode.el @@ -273,6 +273,48 @@ When calling from a program, supply as argument a number, nil, or `-'." (max 0 (- win-height next-screen-context-lines))))) (t (image-next-line (- (prefix-numeric-value n)))))) +(defun image-scroll-left (&optional n) + "Scroll image in current window leftward by N character widths. +Stop if the right edge of the image is reached. +If ARG is omitted or nil, scroll leftward by a near full screen. +A near full screen is 2 columns less than a full screen. +Negative ARG means scroll rightward. +If ARG is the atom `-', scroll rightward by nearly full screen. +When calling from a program, supply as argument a number, nil, or `-'." + (interactive "P") + (cond ((null n) + (let* ((edges (window-inside-edges)) + (win-width (- (nth 2 edges) (nth 0 edges)))) + (image-forward-hscroll + (max 0 (- win-width 2))))) + ((eq n '-) + (let* ((edges (window-inside-edges)) + (win-width (- (nth 2 edges) (nth 0 edges)))) + (image-forward-hscroll + (min 0 (- 2 win-width))))) + (t (image-forward-hscroll (prefix-numeric-value n))))) + +(defun image-scroll-right (&optional n) + "Scroll image in current window rightward by N character widths. +Stop if the left edge of the image is reached. +If ARG is omitted or nil, scroll downward by a near full screen. +A near full screen is 2 less than a full screen. +Negative ARG means scroll leftward. +If ARG is the atom `-', scroll leftward by nearly full screen. +When calling from a program, supply as argument a number, nil, or `-'." + (interactive "P") + (cond ((null n) + (let* ((edges (window-inside-edges)) + (win-width (- (nth 2 edges) (nth 0 edges)))) + (image-forward-hscroll + (min 0 (- 2 win-width))))) + ((eq n '-) + (let* ((edges (window-inside-edges)) + (win-width (- (nth 2 edges) (nth 0 edges)))) + (image-forward-hscroll + (max 0 (- win-width 2))))) + (t (image-forward-hscroll (- (prefix-numeric-value n)))))) + (defun image-bol (arg) "Scroll horizontally to the left edge of the image in the current window. With argument ARG not nil or 1, move forward ARG - 1 lines first, @@ -401,6 +443,8 @@ call." (define-key map [remap scroll-down] 'image-scroll-down) (define-key map [remap scroll-up-command] 'image-scroll-up) (define-key map [remap scroll-down-command] 'image-scroll-down) + (define-key map [remap scroll-left] 'image-scroll-left) + (define-key map [remap scroll-right] 'image-scroll-right) (define-key map [remap move-beginning-of-line] 'image-bol) (define-key map [remap move-end-of-line] 'image-eol) (define-key map [remap beginning-of-buffer] 'image-bob) |