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| <title>mousescrollsize(3) - Plan 9 from User Space</title> |
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| <tr><td width=20><td><b>MOUSESCROLLSIZE(3)</b><td align=right><b>MOUSESCROLLSIZE(3)</b> |
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| <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> |
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| <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. |
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| 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. |
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| <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> |
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| <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> |
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| <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> |
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| </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> |
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| 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> |
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| </table> |
| EndSection<br> |
| </font></tt> |
| </table> |
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