Commit d09696f7 authored by Kim F. Storm's avatar Kim F. Storm
Browse files

Avoid accidental yanking of text while scrolling with

the mouse wheel.  This adds a short period after each mouse wheel
scroll event where a click on the mouse wheel button is ignored.

(mouse-wheel-click-event, mouse-wheel-inhibit-click-time): New customs.
(mouse-wheel-click-button, mwheel-inhibit-click-event-timer): New vars.
(mwheel-inhibit-click-timeout,mwheel-filter-click-events): New defuns.
(mwheel-scroll): Add mwheel-filter-click-events as pre-command-hook.
Start mwheel-inhibit-click-event-timer with timeout handler
parent 30590488
;;; mwheel.el --- Mouse support for MS intelli-mouse type mice
;;; mwheel.el --- Wheel mouse support
;; Copyright (C) 1998,2000,2001,2002 Free Software Foundation, Inc.
;; Maintainer: William M. Perry <>
......@@ -40,6 +40,7 @@
;;; Code:
(require 'custom)
(require 'timer)
;; Setter function for mouse-button user-options. Switch Mouse Wheel
;; mode off and on again so that the old button is unbound and
......@@ -74,6 +75,26 @@
:type 'symbol
:set 'mouse-wheel-change-button)
(defvar mouse-wheel-click-button 2
"Obsolete. Use `mouse-wheel-click-event'.")
(defcustom mouse-wheel-click-event
;; In the latest versions of XEmacs, we could just use mouse-%s as well.
(intern (format (if (featurep 'xemacs) "button%s" "mouse-%s")
"Event that should be temporarily inhibited after mouse scrolling.
The mouse wheel is typically on the mouse-2 button, so it may easily
happen that text is accidentially yanked into the buffer when
scrolling with the mouse wheel. To prevent that, this variable can be
set to the event sent when clicking on the mouse wheel button."
:group 'mouse
:type 'symbol
:set 'mouse-wheel-change-button)
(defcustom mouse-wheel-inhibit-click-time 0.35
"Time in seconds to inhibit clicking on mouse wheel button after scroll."
:group 'mouse
:type 'float)
(defcustom mouse-wheel-scroll-amount '(5 ((shift) . 1) ((control) . nil))
"Amount to scroll windows by when spinning the mouse wheel.
This is an alist mapping the modifier key to the amount to scroll when
......@@ -140,6 +161,19 @@ This can be slightly disconcerting, but some people prefer it."
(posn-window (event-start event)))
(fset 'mwheel-event-window 'event-window))
(defvar mwheel-inhibit-click-event-timer nil
"Timer running while mouse wheel click event is inhibited.")
(defun mwheel-inhibit-click-timeout ()
"Handler for `mwheel-inhibit-click-event-timer'."
(setq mwheel-inhibit-click-event-timer nil)
(remove-hook 'pre-command-hook 'mwheel-filter-click-events))
(defun mwheel-filter-click-events ()
"Discard `mouse-wheel-click-event' while scrolling the mouse."
(if (eq (event-basic-type last-input-event) mouse-wheel-click-event)
(setq this-command 'ignore)))
(defun mwheel-scroll (event)
"Scroll up or down according to the EVENT.
This should only be bound to mouse buttons 4 and 5."
......@@ -165,8 +199,14 @@ This should only be bound to mouse buttons 4 and 5."
(cond ((eq button mouse-wheel-down-event) (scroll-down amt))
((eq button mouse-wheel-up-event) (scroll-up amt))
(t (error "Bad binding in mwheel-scroll"))))
(if curwin (select-window curwin)))))
(if curwin (select-window curwin))))
(when (and mouse-wheel-click-event mouse-wheel-inhibit-click-time)
(if mwheel-inhibit-click-event-timer
(cancel-timer mwheel-inhibit-click-event-timer)
(add-hook 'pre-command-hook 'mwheel-filter-click-events))
(setq mwheel-inhibit-click-event-timer
(run-with-timer mouse-wheel-inhibit-click-time nil
(define-minor-mode mouse-wheel-mode
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