Manual Reference Pages - MOUSESCROLLSIZE (3)
mousescrollsize - compute mouse scroll increment
int mousescrollsize(int maxlines)
Mousescrollsize computes the number of lines of text that should be scrolled
in response to a mouse scroll wheel click.
Maxlines is the number of lines visible in the text window.
The default scroll increment is one line.
This default can be overridden by setting the
$mousescrollsize environment variable to an integer, which specifies
a constant number of lines, or to a real number
followed by a percent character, indicating that the
scroll increment should be a percentage of the total
number of lines in the window.
For example, setting
50% causes a half-window scroll increment.
Mousescrollsize is used by
to set their scrolling behavior.
Libdraw expects up and down scroll wheel events to be expressed as clicks of mouse buttons 4 and 5,
but the XFree86 default is to ignore the scroll wheel.
To enable the scroll wheel, change your
InputDevice section of
XF86Config-4 to look like:
Option "Device" "/dev/psaux"
# next four lines enable scroll wheel as buttons 4 and 5
Option "Buttons" "5"
Option "Emulate3Buttons" "off"
Option "Protocol" "ImPS/2"
Option "ZAxisMapping" "4 5"
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