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<h4 class="unnumberedsubsec">Key_engraver</h4>
<p>Engrave a key signature.
<p>Music types accepted:
<p><a href="key_002dchange_002devent.fr.html#key_002dchange_002devent">key-change-event</a>
<p>Properties (read)
<blockquote>
<dl>
<dt><code>createKeyOnClefChange</code> (boolean)<dd>Print a key signature whenever
the clef is changed.
<br><dt><code>explicitKeySignatureVisibility</code> (vector)<dd>‘<samp><span class="samp">break-visibility</span></samp>’
function for explicit key changes. ‘<samp><span class="samp">\override</span></samp>’ of the
<code>break-visibility</code> property will set the visibility for normal
(i.e., at the start of the line) key signatures.
<br><dt><code>extraNatural</code> (boolean)<dd>Whether to typeset an extra natural sign
before accidentals changing from a non-natural to another
non-natural.
<br><dt><code>keyAlterationOrder</code> (list)<dd>An alist that defines in what order
alterations should be printed. The format is <code>(</code><var>step</var><code>
. </code><var>alter</var><code>)</code>, where <var>step</var> is a number from 0 to 6 and
<var>alter</var> from -2 (sharp) to 2 (flat).
<br><dt><code>keySignature</code> (list)<dd>The current key signature. This is an alist
containing <code>(</code><var>step</var><code> . </code><var>alter</var><code>)</code> or <code>((</code><var>octave</var><code> .
</code><var>step</var><code>) . </code><var>alter</var><code>)</code>, where <var>step</var> is a number in the range
0 to 6 and <var>alter</var> a fraction, denoting alteration. For
alterations, use symbols, e.g. <code>keySignature = #`((6 . ,FLAT))</code>.
<br><dt><code>lastKeySignature</code> (list)<dd>Last key signature before a key
signature change.
<br><dt><code>printKeyCancellation</code> (boolean)<dd>Print restoration alterations
before a key signature change.
</dl>
</blockquote>
Properties (write)
<blockquote>
<dl>
<dt><code>keySignature</code> (list)<dd>The current key signature. This is an alist
containing <code>(</code><var>step</var><code> . </code><var>alter</var><code>)</code> or <code>((</code><var>octave</var><code> .
</code><var>step</var><code>) . </code><var>alter</var><code>)</code>, where <var>step</var> is a number in the range
0 to 6 and <var>alter</var> a fraction, denoting alteration. For
alterations, use symbols, e.g. <code>keySignature = #`((6 . ,FLAT))</code>.
<br><dt><code>lastKeySignature</code> (list)<dd>Last key signature before a key
signature change.
<br><dt><code>tonic</code> (pitch)<dd>The tonic of the current scale.
</dl>
</blockquote>
<p>This engraver creates the following layout object(s):
<p><a href="KeySignature.fr.html#KeySignature">KeySignature</a>.
<p><code>Key_engraver</code> is part of the following context(s): <a href="GregorianTranscriptionStaff.fr.html#GregorianTranscriptionStaff">GregorianTranscriptionStaff</a>, <a href="MensuralStaff.fr.html#MensuralStaff">MensuralStaff</a>, <a href="Staff.fr.html#Staff">Staff</a> and <a href="VaticanaStaff.fr.html#VaticanaStaff">VaticanaStaff</a>.
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