Removed mouse-wheel event, added wheel-up and wheel-down

event, with a note about how to use mwheel.el to handle both these
events and mouse-4 and mouse-5 events.

1 files changed, 10 insertions, 11 deletions

diff --git a/lispref/commands.texi b/lispref/commands.texi
index 5f0a73b2153..299c7bb61af 100644
--- a/lispref/commands.texi
+++ b/lispref/commands.texi
@@ -1501,21 +1501,20 @@ This kind of event indicates that the user deiconified @var{frame} using
 the window manager.  Its standard definition is @code{ignore}; since the
 frame has already been made visible, Emacs has no work to do.
 
-@cindex @code{mouse-wheel} event
-@item (mouse-wheel @var{position} @var{delta})
-This kind of event is generated by moving a wheel on a mouse (such as
-the MS Intellimouse).  Its effect is typically a kind of scroll or zoom.
-
-The element @var{delta} describes the amount and direction of the wheel
-rotation.  Its absolute value is the number of increments by which the
-wheel was rotated.  A negative @var{delta} indicates that the wheel was
-rotated backwards, towards the user, and a positive @var{delta}
-indicates that the wheel was rotated forward, away from the user.
+@cindex @code{wheel-up} event
+@cindex @code{wheel-down} event
+@item (wheel-up @var{position})
+@item (wheel-down @var{position})
+This kind of event is generated by moving a wheel on a mouse.  Its
+effect is typically a kind of scroll or zoom.
 
 The element @var{position} is a list describing the position of the
 event, in the same format as used in a mouse-click event.
 
-This kind of event is generated only on some kinds of systems.
+This kind of event is generated only on some kinds of systems. On
+other systems, mouse-4 and mouse-5 may be used instead.  For portable
+code, the variables @code{mouse-wheel-up-event} and
+@code{mouse-wheel-down-event} defined in @file{mwheel.el} can be used.
 
 @cindex @code{drag-n-drop} event
 @item (drag-n-drop @var{position} @var{files})