\f
;;;; Buffer navigation using the scroll bar.
+;;; This was used for up-events on button 2, but no longer.
(defun scroll-bar-set-window-start (event)
"Set the window start according to where the scroll bar is dragged.
EVENT should be a scroll bar click or drag event."
(beginning-of-line)
(set-window-start window (point))))))
+;; Scroll the window to the proper position for EVENT.
+(defun scroll-bar-drag-1 (event)
+ (let* ((start-position (event-start event))
+ (window (nth 0 start-position))
+ (portion-whole (nth 2 start-position)))
+ (save-excursion
+ (set-buffer (window-buffer window))
+ (goto-char (scroll-bar-scale portion-whole (buffer-size)))
+ (beginning-of-line)
+ (set-window-start window (point)))))
+
+(defun scroll-bar-drag (event)
+ "Scroll the window by dragging the scroll bar slider.
+If you click outside the slider, the window scrolls to bring the slider there."
+ (interactive "e")
+ (let* (done)
+ (scroll-bar-drag-1 event)
+ (track-mouse
+ (while (not done)
+ (setq event (read-event))
+ (if (eq (car-safe event) 'mouse-movement)
+ (setq event (read-event)))
+ (cond ((eq (car-safe event) 'scroll-bar-movement)
+ (scroll-bar-drag-1 event))
+ (t
+ ;; Exit when we get the drag event; ignore that event.
+ (setq done t)))))))
+
(defun scroll-bar-scroll-down (event)
"Scroll the window's top line down to the location of the scroll bar click.
EVENT should be a scroll bar click."
(global-set-key [vertical-scroll-bar mouse-1] 'scroll-bar-scroll-up)
(global-set-key [vertical-scroll-bar drag-mouse-1] 'scroll-bar-scroll-up)
-(global-set-key [vertical-scroll-bar mouse-2] 'scroll-bar-set-window-start)
-(global-set-key [vertical-scroll-bar drag-mouse-2] 'scroll-bar-set-window-start)
-
+(global-set-key [vertical-scroll-bar down-mouse-2] 'scroll-bar-drag)
+
(global-set-key [vertical-scroll-bar mouse-3] 'scroll-bar-scroll-down)
(global-set-key [vertical-scroll-bar drag-mouse-3] 'scroll-bar-scroll-down)