- ;; Track the mouse until we get a non-movement event.
- (track-mouse
- (while (progn
- (setq event (read-event))
- (or (mouse-movement-p event)
- (memq (car-safe event) '(switch-frame select-window))))
- (unless (memq (car-safe event) '(switch-frame select-window))
- ;; Automatic hscrolling did not occur during the call to
- ;; `read-event'; but if the user subsequently drags the
- ;; mouse, go ahead and hscroll.
- (let ((auto-hscroll-mode auto-hscroll-mode-saved))
- (redisplay))
- (setq end (event-end event)
- end-point (posn-point end))
- ;; Note whether the mouse has left the starting position.
- (unless (eq end-point start-point)
- (setq moved-off-start t))
- (if (and (eq (posn-window end) start-window)
- (integer-or-marker-p end-point))
- (mouse--drag-set-mark-and-point start-point
- end-point click-count)
- (let ((mouse-row (cdr (cdr (mouse-position)))))
- (cond
- ((null mouse-row))
- ((< mouse-row top)
- (mouse-scroll-subr start-window (- mouse-row top)
- nil start-point))
- ((>= mouse-row bottom)
- (mouse-scroll-subr start-window (1+ (- mouse-row bottom))
- nil start-point))))))))
-
- ;; Handle the terminating event if possible.
- (when (consp event)
- ;; Ensure that point is on the end of the last event.
- (when (and (setq end-point (posn-point (event-end event)))
- (eq (posn-window end) start-window)
- (integer-or-marker-p end-point)
- (/= start-point end-point))
- (mouse--drag-set-mark-and-point start-point
- end-point click-count))
-
- ;; Find its binding.
- (let* ((fun (key-binding (vector (car event))))
- ;; FIXME This doesn't make sense, because
- ;; event-click-count always returns something >= 1.
- (do-multi-click (and (> (event-click-count event) 0)
- (functionp fun)
- (not (memq fun '(mouse-set-point
- mouse-set-region))))))
- (if (and (/= (mark) (point))
- (not do-multi-click))
-
- ;; If point has moved, finish the drag.
- (let* (last-command this-command)
- (and mouse-drag-copy-region
- do-mouse-drag-region-post-process
- (let (deactivate-mark)
- (copy-region-as-kill (mark) (point)))))
-
- ;; Otherwise, run binding of terminating up-event.
+ (setf (terminal-parameter nil 'mouse-drag-start) start-event)
+ (setq track-mouse t)
+ (setq auto-hscroll-mode nil)
+
+ (set-transient-map
+ (let ((map (make-sparse-keymap)))
+ (define-key map [switch-frame] #'ignore)
+ (define-key map [select-window] #'ignore)
+ (define-key map [mouse-movement]
+ (lambda (event) (interactive "e")
+ (let* ((end (event-end event))
+ (end-point (posn-point end)))
+ (unless (eq end-point start-point)
+ ;; As soon as the user moves, we can re-enable auto-hscroll.
+ (setq auto-hscroll-mode auto-hscroll-mode-saved)
+ ;; And remember that we have moved, so mouse-set-region can know
+ ;; its event is really a drag event.
+ (setcar start-event 'mouse-movement))
+ (if (and (eq (posn-window end) start-window)
+ (integer-or-marker-p end-point))
+ (mouse--drag-set-mark-and-point start-point
+ end-point click-count)
+ (let ((mouse-row (cdr (cdr (mouse-position)))))
+ (cond
+ ((null mouse-row))
+ ((< mouse-row top)
+ (mouse-scroll-subr start-window (- mouse-row top)
+ nil start-point))
+ ((>= mouse-row bottom)
+ (mouse-scroll-subr start-window (1+ (- mouse-row bottom))
+ nil start-point))))))))
+ map)
+ t (lambda ()
+ (setq track-mouse nil)
+ (setq auto-hscroll-mode auto-hscroll-mode-saved)