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<title>Sly: Keyboard</title>
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<a name="Keyboard"></a>
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<p>
Next: <a href="Mouse.html#Mouse" accesskey="n" rel="next">Mouse</a>, Up: <a href="Input.html#Input" accesskey="u" rel="up">Input</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Keyboard-1"></a>
<h4 class="subsection">4.4.1 Keyboard</h4>
<div class="example">
<pre class="example">(use-modules (sly input keyboard))
</pre></div>
<p>Keyboard hooks, signals, and procedures.
</p>
<dl>
<dt><a name="index-key_002dpress_002dhook"></a>Scheme Variable: <strong>key-press-hook</strong></dt>
<dd><p>This hook is run whenever a key is pressed down. Procedures added to
this hook should accept two arguments: <code>key</code>, a symbol, and
<code>char</code>, a unicode character.
</p></dd></dl>
<dl>
<dt><a name="index-key_002drelease_002dhook"></a>Scheme Variable: <strong>key-release-hook</strong></dt>
<dd><p>This hook is run whenever a key is released. Procedures added to this
hook should accept two arguments: <code>key</code>, a symbol, and
<code>char</code>, a unicode character.
</p></dd></dl>
<dl>
<dt><a name="index-key_002dlast_002ddown"></a>Scheme Signal: <strong>key-last-down</strong></dt>
<dd><p>The last key pressed.
</p></dd></dl>
<dl>
<dt><a name="index-key_002dlast_002dup"></a>Scheme Signal: <strong>key-last-up</strong></dt>
<dd><p>The last key released.
</p></dd></dl>
<dl>
<dt><a name="index-key_002ddown_003f"></a>Scheme Procedure: <strong>key-down?</strong> <em><var>key</var></em></dt>
<dd><p>Create a signal for the state of <code>key</code>. The signal value is
<code>#t</code> when <code>key</code> is pressed and <code>#f</code> otherwise.
</p></dd></dl>
<p>A lot of games use directional keys to control the player. The below
procedure and signals make this style of movement easy to use.
</p>
<dl>
<dt><a name="index-key_002ddirections"></a>Scheme Procedure: <strong>key-directions</strong> <em><var>up</var> <var>down</var> <var>left</var> <var>right</var></em></dt>
<dd><p>Create a signal whose value is a 2D unit vector that can be used for
8-directional movement. The vector is determined by the state of the
directional keys: <code>up</code>, <code>down</code>, <code>left</code>, <code>right</code>.
</p></dd></dl>
<dl>
<dt><a name="index-key_002darrows"></a>Scheme Signal: <strong>key-arrows</strong></dt>
<dd><p>A 2D directional vector based on the state of the arrow keys.
</p></dd></dl>
<dl>
<dt><a name="index-key_002dwasd"></a>Scheme Signal: <strong>key-wasd</strong></dt>
<dd><p>A 2D directional vector based on the state of the WASD keys.
</p></dd></dl>
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