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<html><head><title>Phonon.EffectParameter Class Reference</title><style>h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm }
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</style></head><body><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr /><td align="left" valign="top" width="32"><img align="left" border="0" height="32" src="images/rb-logo.png" width="32" /></td><td width="1">  </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="modules.html"><font color="#004faf">Modules</font></a></td></table><h1 align="center">Phonon.EffectParameter Class Reference<br /><sup><sup>[<a href="phonon.html">phonon</a> module]</sup></sup></h1><p>The EffectParameter class describes one parameter of an effect.
<a href="#details">More...</a></p>
<h3>Types</h3><ul><li><div class="fn" />enum <b><a href="phonon-effectparameter.html#Hint-enum">Hint</a></b> { ToggledHint, LogarithmicHint, IntegerHint }</li><li><div class="fn" />class <b><a href="phonon-effectparameter-hints.html">Hints</a></b></li></ul><h3>Methods</h3><ul><li><div class="fn" /><b><a href="phonon-effectparameter.html#EffectParameter">__init__</a></b> (<i>self</i>, int <i>parameterId</i>, QString <i>name</i>, Hints <i>hints</i>, QVariant <i>defaultValue</i>, QVariant <i>min</i> = QVariant(), QVariant <i>max</i> = QVariant(), list-of-QVariant <i>values</i> = [], QString <i>description</i> = QString())</li><li><div class="fn" /><b><a href="phonon-effectparameter.html#EffectParameter-2">__init__</a></b> (<i>self</i>, EffectParameter <i>rhs</i>)</li><li><div class="fn" />QVariant <b><a href="phonon-effectparameter.html#defaultValue">defaultValue</a></b> (<i>self</i>)</li><li><div class="fn" />QString <b><a href="phonon-effectparameter.html#description">description</a></b> (<i>self</i>)</li><li><div class="fn" />bool <b><a href="phonon-effectparameter.html#isLogarithmicControl">isLogarithmicControl</a></b> (<i>self</i>)</li><li><div class="fn" />QVariant <b><a href="phonon-effectparameter.html#maximumValue">maximumValue</a></b> (<i>self</i>)</li><li><div class="fn" />QVariant <b><a href="phonon-effectparameter.html#minimumValue">minimumValue</a></b> (<i>self</i>)</li><li><div class="fn" />QString <b><a href="phonon-effectparameter.html#name">name</a></b> (<i>self</i>)</li><li><div class="fn" />list-of-QVariant <b><a href="phonon-effectparameter.html#possibleValues">possibleValues</a></b> (<i>self</i>)</li><li><div class="fn" />Type <b><a href="phonon-effectparameter.html#type">type</a></b> (<i>self</i>)</li></ul><h3>Special Methods</h3><ul><li><div class="fn" />int <b><a href="phonon-effectparameter.html#__hash__">__hash__</a></b> (<i>self</i>)</li></ul><a name="details" /><hr /><h2>Detailed Description</h2><p>The EffectParameter class describes one parameter of an
effect.</p>
<p>You fetch the parameters of an <a href="phonon-effect.html">Effect</a> with <a href="phonon-effect.html#parameters">Effect.parameters()</a>.</p>
<pre class="cpp">
<span class="type"><a href="qlist.html">QList</a></span><span class="operator"><</span>Phonon<span class="operator">.</span>EffectParameter<span class="operator">></span> parameters <span class="operator">=</span> effect<span class="operator">-</span><span class="operator">></span>parameters();
foreach(Phonon<span class="operator">.</span>EffectParameter parameter<span class="operator">,</span> parameters) {
<span class="comment">// Do something with parameter</span>
}
</pre>
<p>To describe itself, an effect parameter gives a <a href="phonon-effectparameter.html#name">name</a>() and possibly <a href="phonon-effectparameter.html#description">description</a>()
(depending on the backend used). These are suited to present the
effect parameter to the user of a Phonon application.</p>
<p>Note that effects are created by the backend, and that their
name and descriptions may vary.</p>
<p>The value of an effect parameter is stored in a <a href="qvariant.html">QVariant</a>, of which <a href="phonon-effectparameter.html#type">type</a>() is usually
<tt>int</tt> or <tt>double</tt>.</p>
<p>The value is retrieved with <a href="phonon-effect.html#parameterValue">Effect.parameterValue()</a>
and set with <a href="phonon-effect.html#setParameterValue">setParameterValue()</a> -
both of which takes the EffectParameter as argument. Note that not
all effect parameters support setting of their value.</p>
<p>You get the values a parameter can take with <a href="phonon-effectparameter.html#possibleValues">possibleValues</a>();
an empty list is returned if the values are continuous.</p>
<p>A parameter may also specify <a href="qdialog.html#default">default</a>(), minimum(), and maximum()
values. Values are returned as <a href="qvariant.html">QVariant</a>s. If the parameter does not have the
requested value, an <a href="qvariant.html#Type-enum">QVariant.Invalid</a> invalid <a href="qvariant.html">QVariant</a> is returned from these functions.</p>
<p>The <a href="phonon-effectwidget.html">EffectWidget</a> provides
a widget with which one can control the parameters of an <a href="phonon-effect.html">Effect</a>.</p>
<pre class="cpp">
Phonon<span class="operator">.</span>EffectWidget <span class="operator">*</span>effectWidget <span class="operator">=</span> <span class="keyword">new</span> Phonon<span class="operator">.</span>EffectWidget(effect);
</pre><hr /><h2>Type Documentation</h2><h3 class="fn"><a name="Hint-enum" />EffectParameter.Hint</h3><p>Only for backend developers:</p>
<p>Flags to set the return values of isToggleControl(), <a href="phonon-effectparameter.html#isLogarithmicControl">isLogarithmicControl</a>(),
isIntegerControl(), isBoundedBelow() and isBoundedAbove(). The
values of the flags correspond to the values used for LADSPA
effects.</p>
<table class="valuelist">
<tr class="odd" valign="top">
<th class="tblConst">Constant</th>
<th class="tblval">Value</th>
<th class="tbldscr">Description</th>
</tr>
<tr>
<td class="topAlign">
<tt>Phonon.EffectParameter.ToggledHint</tt></td>
<td class="topAlign"><tt>0x04</tt></td>
<td class="topAlign">If this hint is set it means that the control
has only two states: zero and non-zero (see
isToggleControl()).</td>
</tr>
<tr>
<td class="topAlign">
<tt>Phonon.EffectParameter.LogarithmicHint</tt></td>
<td class="topAlign"><tt>0x10</tt></td>
<td class="topAlign">LADSPA's SAMPLE_RATE hint needs to be
translated by the backend to normal bounds, as the backend knows
the sample rate - and the frontend doesn't (see <a href="phonon-effectparameter.html#isLogarithmicControl">isLogarithmicControl</a>()).</td>
</tr>
<tr>
<td class="topAlign">
<tt>Phonon.EffectParameter.IntegerHint</tt></td>
<td class="topAlign"><tt>0x20</tt></td>
<td class="topAlign">See isIntegerControl().</td>
</tr>
</table>
<p>The Hints type is a typedef for <a href="qflags.html">QFlags</a><Hint>. It stores an OR combination
of Hint values.</p>
<hr /><h2>Method Documentation</h2><h3 class="fn"><a name="EffectParameter" />EffectParameter.__init__ (<i>self</i>, int <i>parameterId</i>, QString <i>name</i>, <a href="phonon-effectparameter-hints.html">Hints</a> <i>hints</i>, QVariant <i>defaultValue</i>, QVariant <i>min</i> = QVariant(), QVariant <i>max</i> = QVariant(), list-of-QVariant <i>values</i> = [], QString <i>description</i> = QString())</h3><p>Constructs a copy of the <i>other</i> effect parameter.</p>
<h3 class="fn"><a name="EffectParameter-2" />EffectParameter.__init__ (<i>self</i>, <a href="phonon-effectparameter.html">EffectParameter</a> <i>rhs</i>)</h3><h3 class="fn"><a name="defaultValue" />QVariant EffectParameter.defaultValue (<i>self</i>)</h3><p>The default value.</p>
<h3 class="fn"><a name="description" />QString EffectParameter.description (<i>self</i>)</h3><p>The parameter may come with a description (LADSPA doesn't have a
field for this, so don't expect many effects to provide a
description).</p>
<p>The description can be used for a tooltip or WhatsThis help.</p>
<p>Returns A text describing the parameter.</p>
<h3 class="fn"><a name="isLogarithmicControl" />bool EffectParameter.isLogarithmicControl (<i>self</i>)</h3><p>Returns whether the parameter should be displayed using a
logarithmic scale. This is particularly useful for frequencies and
gains.</p>
<h3 class="fn"><a name="maximumValue" />QVariant EffectParameter.maximumValue (<i>self</i>)</h3><p>The maximum value to be used for the control to edit the
parameter.</p>
<p>If the returned <a href="qvariant.html">QVariant</a> is invalid
the value is not bounded from above.</p>
<h3 class="fn"><a name="minimumValue" />QVariant EffectParameter.minimumValue (<i>self</i>)</h3><p>The minimum value to be used for the control to edit the
parameter.</p>
<p>If the returned <a href="qvariant.html">QVariant</a> is invalid
the value is not bounded from below.</p>
<h3 class="fn"><a name="name" />QString EffectParameter.name (<i>self</i>)</h3><p>The name of the parameter. Can be used as the label.</p>
<p>Returns A label for the parameter.</p>
<h3 class="fn"><a name="possibleValues" />list-of-QVariant EffectParameter.possibleValues (<i>self</i>)</h3><p>The possible values to be used for the control to edit the
parameter.</p>
<p>if the value of this parameter is to be picked from predefined
values this returns the list (otherwise it returns an empty
<a href="qvariant.html#QVariantList-typedef">QVariantList</a>).</p>
<h3 class="fn"><a name="type" /><a href="qtcore.html#Type-enum">Type</a> EffectParameter.type (<i>self</i>)</h3><p>Returns the parameter type.</p>
<p>Common types are <a href="qvariant.html#Type-enum">QVariant.Int</a>, <a href="qvariant.html#Type-enum">QVariant.Double</a>, <a href="qvariant.html#Type-enum">QVariant.Bool</a> and <a href="qvariant.html#Type-enum">QVariant.String</a>. When <a href="qvariant.html#Type-enum">QVariant.String</a> is returned you get
the possible values from possibleValues.</p>
<h3 class="fn"><a name="__hash__" />int EffectParameter.__hash__ (<i>self</i>)</h3><address><hr /><div align="center"><table border="0" cellspacing="0" width="100%"><tr class="address"><td align="left" width="25%">PyQt 4.10.3 for X11</td><td align="center" width="50%">Copyright © <a href="http://www.riverbankcomputing.com">Riverbank Computing Ltd</a> and <a href="http://www.qtsoftware.com">Nokia</a> 2012</td><td align="right" width="25%">Qt 4.8.5</td></tr></table></div></address></body></html>
