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62 lines
1.5 KiB
Groff
62 lines
1.5 KiB
Groff
.TH MOUSESCROLLSIZE 3
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.SH NAME
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mousescrollsize \- compute mouse scroll increment
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.SH SYNOPSIS
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.B #include <draw.h>
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.PP
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int mousescrollsize(int maxlines)
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.SH DESCRIPTION
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.I Mousescrollsize
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computes the number of lines of text that should be scrolled
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in response to a mouse scroll wheel click.
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.I Maxlines
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is the number of lines visible in the text window.
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.PP
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The default scroll increment is one line.
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This default can be overridden by setting the
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.B $mousescrollsize
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environment variable to an integer, which specifies
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a constant number of lines, or to a real number
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followed by a percent character, indicating that the
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scroll increment should be a percentage of the total
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number of lines in the window.
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For example, setting
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.B $mousescrollsize
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to
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.B 50%
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causes a half-window scroll increment.
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.PP
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.I Mousescrollsize
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is used by
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.MR 9term (1)
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and
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.MR acme (1)
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to set their scrolling behavior.
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.SH SOURCE
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.B \*9/src/libdraw/scroll.c
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.SH SEE ALSO
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.MR 9term (1) ,
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.MR acme (1)
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.SH BUGS
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.I Libdraw
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expects up and down scroll wheel events to be expressed as clicks of mouse buttons 4 and 5,
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but the XFree86 default is to ignore the scroll wheel.
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To enable the scroll wheel, change your
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.B InputDevice
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section of
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.B XF86Config-4
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to look like:
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.IP
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.EX
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Section "InputDevice"
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Identifier "Mouse0"
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Driver "mouse"
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Option "Device" "/dev/psaux"
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# next four lines enable scroll wheel as buttons 4 and 5
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Option "Buttons" "5"
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Option "Emulate3Buttons" "off"
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Option "Protocol" "ImPS/2"
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Option "ZAxisMapping" "4 5"
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EndSection
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.EE
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