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<head>
<title>mousescrollsize(3) - Plan 9 from User Space</title>
<meta content="text/html; charset=utf-8" http-equiv=Content-Type>
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<tr><td width=20><td>
<tr><td width=20><td><b>MOUSESCROLLSIZE(3)</b><td align=right><b>MOUSESCROLLSIZE(3)</b>
<tr><td width=20><td colspan=2>
<br>
<p><font size=+1><b>NAME </b></font><br>
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mousescrollsize – compute mouse scroll increment<br>
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<p><font size=+1><b>SYNOPSIS </b></font><br>
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<tt><font size=+1>#include <draw.h>
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int mousescrollsize(int maxlines)<br>
</table>
<p><font size=+1><b>DESCRIPTION </b></font><br>
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<i>Mousescrollsize</i> computes the number of lines of text that should
be scrolled in response to a mouse scroll wheel click. <i>Maxlines</i>
is the number of lines visible in the text window.
<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
The default scroll increment is one line. This default can be
overridden by setting the <tt><font size=+1>$mousescrollsize</font></tt> environment variable
to an integer, which specifies a constant number of lines, or
to a real number followed by a percent character, indicating that
the scroll increment should be a percentage of the total
number of lines in the window. For example, setting <tt><font size=+1>$mousescrollsize</font></tt>
to <tt><font size=+1>50%</font></tt> causes a half-window scroll increment.
<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
<i>Mousescrollsize</i> is used by <a href="../man1/9term.html"><i>9term</i>(1)</a> and <a href="../man1/acme.html"><i>acme</i>(1)</a> to set their scrolling
behavior.<br>
</table>
<p><font size=+1><b>SOURCE </b></font><br>
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<tt><font size=+1>/usr/local/plan9/src/libdraw/scroll.c<br>
</font></tt>
</table>
<p><font size=+1><b>SEE ALSO </b></font><br>
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<a href="../man1/9term.html"><i>9term</i>(1)</a>, <a href="../man1/acme.html"><i>acme</i>(1)</a><br>
</table>
<p><font size=+1><b>BUGS </b></font><br>
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<i>Libdraw</i> 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 <tt><font size=+1>InputDevice</font></tt> section of <tt><font size=+1>XF86Config−4</font></tt> to look like:<br>
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<tt><font size=+1>Section "InputDevice"<br>
<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
Identifier "Mouse0"<br>
Driver "mouse"<br>
Option "Device" "/dev/psaux"<br>
# next four lines enable scroll wheel as buttons 4 and 5<br>
Option "Buttons" "5"<br>
Option "Emulate3Buttons" "off"<br>
Option "Protocol" "ImPS/2"<br>
Option "ZAxisMapping" "4 5"<br>
</table>
EndSection<br>
</font></tt>
</table>
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<!-- TRAILER -->
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<tr><td><td>
<center>
<a href="../../"><img src="../../dist/spaceglenda100.png" alt="Space Glenda" border=1></a>
</center>
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<!-- TRAILER -->
</body></html>
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