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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>ClutterBehaviour: Clutter Reference Manual</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
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<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle">
<td width="100%" align="left" class="shortcuts">
<a href="#" class="shortcut">Top</a><span id="nav_description">  <span class="dim">|</span> 
                  <a href="#ClutterBehaviour.description" class="shortcut">Description</a></span><span id="nav_hierarchy">  <span class="dim">|</span> 
                  <a href="#ClutterBehaviour.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_interfaces">  <span class="dim">|</span> 
                  <a href="#ClutterBehaviour.implemented-interfaces" class="shortcut">Implemented Interfaces</a></span><span id="nav_properties">  <span class="dim">|</span> 
                  <a href="#ClutterBehaviour.properties" class="shortcut">Properties</a></span><span id="nav_signals">  <span class="dim">|</span> 
                  <a href="#ClutterBehaviour.signals" class="shortcut">Signals</a></span>
</td>
<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
<td><a accesskey="u" href="deprecated.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
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</tr></table>
<div class="refentry">
<a name="ClutterBehaviour"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="ClutterBehaviour.top_of_page"></a>ClutterBehaviour</span></h2>
<p>ClutterBehaviour — Class for providing behaviours to actors</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="ClutterBehaviour.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="ClutterBehaviour.html#clutter-behaviour-apply" title="clutter_behaviour_apply ()">clutter_behaviour_apply</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="ClutterBehaviour.html#clutter-behaviour-remove" title="clutter_behaviour_remove ()">clutter_behaviour_remove</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="ClutterBehaviour.html#clutter-behaviour-remove-all" title="clutter_behaviour_remove_all ()">clutter_behaviour_remove_all</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="ClutterBehaviour.html#clutter-behaviour-is-applied" title="clutter_behaviour_is_applied ()">clutter_behaviour_is_applied</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="ClutterBehaviour.html#ClutterBehaviourForeachFunc" title="ClutterBehaviourForeachFunc ()">*ClutterBehaviourForeachFunc</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="ClutterBehaviour.html#clutter-behaviour-actors-foreach" title="clutter_behaviour_actors_foreach ()">clutter_behaviour_actors_foreach</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">GSList</span> *
</td>
<td class="function_name">
<a class="link" href="ClutterBehaviour.html#clutter-behaviour-get-actors" title="clutter_behaviour_get_actors ()">clutter_behaviour_get_actors</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gint</span>
</td>
<td class="function_name">
<a class="link" href="ClutterBehaviour.html#clutter-behaviour-get-n-actors" title="clutter_behaviour_get_n_actors ()">clutter_behaviour_get_n_actors</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="ClutterActor.html" title="ClutterActor"><span class="returnvalue">ClutterActor</span></a> *
</td>
<td class="function_name">
<a class="link" href="ClutterBehaviour.html#clutter-behaviour-get-nth-actor" title="clutter_behaviour_get_nth_actor ()">clutter_behaviour_get_nth_actor</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="ClutterAlpha.html" title="ClutterAlpha"><span class="returnvalue">ClutterAlpha</span></a> *
</td>
<td class="function_name">
<a class="link" href="ClutterBehaviour.html#clutter-behaviour-get-alpha" title="clutter_behaviour_get_alpha ()">clutter_behaviour_get_alpha</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="ClutterBehaviour.html#clutter-behaviour-set-alpha" title="clutter_behaviour_set_alpha ()">clutter_behaviour_set_alpha</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="ClutterBehaviour.properties"></a><h2>Properties</h2>
<div class="informaltable"><table border="0">
<colgroup>
<col width="150px" class="properties_type">
<col width="300px" class="properties_name">
<col width="200px" class="properties_flags">
</colgroup>
<tbody><tr>
<td class="property_type">
<a class="link" href="ClutterAlpha.html" title="ClutterAlpha"><span class="type">ClutterAlpha</span></a> *</td>
<td class="property_name"><a class="link" href="ClutterBehaviour.html#ClutterBehaviour--alpha" title="The “alpha” property">alpha</a></td>
<td class="property_flags">Read / Write</td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="ClutterBehaviour.signals"></a><h2>Signals</h2>
<div class="informaltable"><table border="0">
<colgroup>
<col width="150px" class="signals_return">
<col width="300px" class="signals_name">
<col width="200px" class="signals_flags">
</colgroup>
<tbody>
<tr>
<td class="signal_type"><span class="returnvalue">void</span></td>
<td class="signal_name"><a class="link" href="ClutterBehaviour.html#ClutterBehaviour-applied" title="The “applied” signal">applied</a></td>
<td class="signal_flags">Run First</td>
</tr>
<tr>
<td class="signal_type"><span class="returnvalue">void</span></td>
<td class="signal_name"><a class="link" href="ClutterBehaviour.html#ClutterBehaviour-removed" title="The “removed” signal">removed</a></td>
<td class="signal_flags">Run First</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="ClutterBehaviour.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="ClutterBehaviour.html#ClutterBehaviour-struct" title="ClutterBehaviour">ClutterBehaviour</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="ClutterBehaviour.html#ClutterBehaviourClass" title="struct ClutterBehaviourClass">ClutterBehaviourClass</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="ClutterBehaviour.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    GObject
    <span class="lineart">╰──</span> ClutterBehaviour
        <span class="lineart">├──</span> <a class="link" href="ClutterBehaviourDepth.html" title="ClutterBehaviourDepth">ClutterBehaviourDepth</a>
        <span class="lineart">├──</span> <a class="link" href="ClutterBehaviourEllipse.html" title="ClutterBehaviourEllipse">ClutterBehaviourEllipse</a>
        <span class="lineart">├──</span> <a class="link" href="ClutterBehaviourOpacity.html" title="ClutterBehaviourOpacity">ClutterBehaviourOpacity</a>
        <span class="lineart">├──</span> <a class="link" href="ClutterBehaviourPath.html" title="ClutterBehaviourPath">ClutterBehaviourPath</a>
        <span class="lineart">├──</span> <a class="link" href="ClutterBehaviourRotate.html" title="ClutterBehaviourRotate">ClutterBehaviourRotate</a>
        <span class="lineart">╰──</span> <a class="link" href="ClutterBehaviourScale.html" title="ClutterBehaviourScale">ClutterBehaviourScale</a>
</pre>
</div>
<div class="refsect1">
<a name="ClutterBehaviour.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
<p>
ClutterBehaviour implements
 <a class="link" href="ClutterScriptable.html" title="ClutterScriptable">ClutterScriptable</a>.</p>
</div>
<div class="refsect1">
<a name="ClutterBehaviour.description"></a><h2>Description</h2>
<p><a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> is the base class for implementing behaviours.  A
behaviour is a controller object for <a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a>s; you can
use a behaviour to control one or more properties of an actor (such
as its opacity, or its position).  A <a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> is driven by
an "alpha function" stored inside a <a class="link" href="ClutterAlpha.html" title="ClutterAlpha"><span class="type">ClutterAlpha</span></a> object; an alpha
function is a function depending solely on time.  The alpha function
computes a value which is then applied to the properties of the
actors driven by a behaviour.</p>
<p>Clutter provides some pre-defined behaviours, like <a class="link" href="ClutterBehaviourPath.html" title="ClutterBehaviourPath"><span class="type">ClutterBehaviourPath</span></a>,
which controls the position of a set of actors making them "walk" along
a set of nodes; <a class="link" href="ClutterBehaviourOpacity.html" title="ClutterBehaviourOpacity"><span class="type">ClutterBehaviourOpacity</span></a>, which controls the opacity
of a set of actors; <a class="link" href="ClutterBehaviourScale.html" title="ClutterBehaviourScale"><span class="type">ClutterBehaviourScale</span></a>, which controls the width
and height of a set of actors.</p>
<p>To visualize the effects of different alpha functions on a
<a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> implementation it is possible to take the
<a class="link" href="ClutterBehaviourPath.html" title="ClutterBehaviourPath"><span class="type">ClutterBehaviourPath</span></a> as an example:</p>
<p><span class="inlinemediaobject"><img src="path-alpha-func.png"></span></p>
<p>The actors position between the path's end points directly correlates
to the <a class="link" href="ClutterAlpha.html" title="ClutterAlpha"><span class="type">ClutterAlpha</span></a>'s current alpha value driving the behaviour. With
the <a class="link" href="ClutterAlpha.html" title="ClutterAlpha"><span class="type">ClutterAlpha</span></a>'s function set to a linear ramp the actor
will follow the path at a constant velocity, but when changing to
a sine wave the actor initially accelerates before quickly
decelerating.</p>
<p>In order to implement a new behaviour you should subclass <a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a>
and override the "alpha_notify" virtual function; inside the overridden
function you should obtain the alpha value from the <a class="link" href="ClutterAlpha.html" title="ClutterAlpha"><span class="type">ClutterAlpha</span></a>
instance bound to the behaviour and apply it to the desiderd property
(or properties) of every actor controlled by the behaviour.</p>
<p><a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> is available since Clutter 0.2.</p>
<p><a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> and its sub-classes have been discouraged sing Clutter
1.0, and formally deprecated since Clutter 1.6. You should use the
<a class="link" href="ClutterActor.html#clutter-actor-animation" title="Animation">implicit animation</a> support inside <a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a>
if you still have code using <a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a>.</p>
</div>
<div class="refsect1">
<a name="ClutterBehaviour.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="clutter-behaviour-apply"></a><h3>clutter_behaviour_apply ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_behaviour_apply (<em class="parameter"><code><a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> *behave</code></em>,
                         <em class="parameter"><code><a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a> *actor</code></em>);</pre>
<div class="warning"><p><code class="literal">clutter_behaviour_apply</code> has been deprecated since version 1.6 and should not be used in newly-written code.</p></div>
<p>Applies <em class="parameter"><code>behave</code></em>
 to <em class="parameter"><code>actor</code></em>
.  This function adds a reference on
the actor.</p>
<div class="refsect3">
<a name="id-1.11.5.10.2.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>behave</p></td>
<td class="parameter_description"><p>a <a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>actor</p></td>
<td class="parameter_description"><p>a <a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix03.html#api-index-0.2">0.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-behaviour-remove"></a><h3>clutter_behaviour_remove ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_behaviour_remove (<em class="parameter"><code><a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> *behave</code></em>,
                          <em class="parameter"><code><a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a> *actor</code></em>);</pre>
<div class="warning"><p><code class="literal">clutter_behaviour_remove</code> has been deprecated since version 1.6 and should not be used in newly-written code.</p></div>
<p>Removes <em class="parameter"><code>actor</code></em>
 from the list of <a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a>s to which
<em class="parameter"><code>behave</code></em>
 applies.  This function removes a reference on the actor.</p>
<div class="refsect3">
<a name="id-1.11.5.10.3.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>behave</p></td>
<td class="parameter_description"><p>a <a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>actor</p></td>
<td class="parameter_description"><p>a <a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix03.html#api-index-0.2">0.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-behaviour-remove-all"></a><h3>clutter_behaviour_remove_all ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_behaviour_remove_all (<em class="parameter"><code><a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> *behave</code></em>);</pre>
<div class="warning"><p><code class="literal">clutter_behaviour_remove_all</code> has been deprecated since version 1.6 and should not be used in newly-written code.</p></div>
<p>Removes every actor from the list that <em class="parameter"><code>behave</code></em>
 holds.</p>
<div class="refsect3">
<a name="id-1.11.5.10.4.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>behave</p></td>
<td class="parameter_description"><p>a <a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix04.html#api-index-0.4">0.4</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-behaviour-is-applied"></a><h3>clutter_behaviour_is_applied ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
clutter_behaviour_is_applied (<em class="parameter"><code><a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> *behave</code></em>,
                              <em class="parameter"><code><a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a> *actor</code></em>);</pre>
<div class="warning"><p><code class="literal">clutter_behaviour_is_applied</code> has been deprecated since version 1.6 and should not be used in newly-written code.</p></div>
<p>Check if <em class="parameter"><code>behave</code></em>
 applied to  <em class="parameter"><code>actor</code></em>
.</p>
<div class="refsect3">
<a name="id-1.11.5.10.5.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>behave</p></td>
<td class="parameter_description"><p>a <a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>actor</p></td>
<td class="parameter_description"><p>a <a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.11.5.10.5.8"></a><h4>Returns</h4>
<p> TRUE if actor has behaviour. FALSE otherwise.</p>
</div>
<p class="since">Since: <a class="link" href="ix04.html#api-index-0.4">0.4</a></p>
</div>
<hr>
<div class="refsect2">
<a name="ClutterBehaviourForeachFunc"></a><h3>ClutterBehaviourForeachFunc ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
<span class="c_punctuation">(</span>*ClutterBehaviourForeachFunc<span class="c_punctuation">)</span> (<em class="parameter"><code><a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> *behaviour</code></em>,
                                <em class="parameter"><code><a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a> *actor</code></em>,
                                <em class="parameter"><code><span class="type">gpointer</span> data</code></em>);</pre>
<div class="warning"><p><code class="literal">ClutterBehaviourForeachFunc</code> has been deprecated since version 1.6 and should not be used in newly-written code.</p></div>
<p>This function is passed to <a class="link" href="ClutterBehaviour.html#clutter-behaviour-actors-foreach" title="clutter_behaviour_actors_foreach ()"><code class="function">clutter_behaviour_actors_foreach()</code></a> and
will be called for each actor driven by <em class="parameter"><code>behaviour</code></em>
.</p>
<div class="refsect3">
<a name="id-1.11.5.10.6.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>behaviour</p></td>
<td class="parameter_description"><p>the <a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>actor</p></td>
<td class="parameter_description"><p>an actor driven by <em class="parameter"><code>behaviour</code></em>
</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>data</p></td>
<td class="parameter_description"><p> optional data passed to the function. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="This parameter is a 'user_data', for callbacks; many bindings can pass NULL here."><span class="acronym">closure</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix03.html#api-index-0.2">0.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-behaviour-actors-foreach"></a><h3>clutter_behaviour_actors_foreach ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_behaviour_actors_foreach (<em class="parameter"><code><a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> *behave</code></em>,
                                  <em class="parameter"><code><a class="link" href="ClutterBehaviour.html#ClutterBehaviourForeachFunc" title="ClutterBehaviourForeachFunc ()"><span class="type">ClutterBehaviourForeachFunc</span></a> func</code></em>,
                                  <em class="parameter"><code><span class="type">gpointer</span> data</code></em>);</pre>
<div class="warning"><p><code class="literal">clutter_behaviour_actors_foreach</code> has been deprecated since version 1.6 and should not be used in newly-written code.</p></div>
<p>Calls <em class="parameter"><code>func</code></em>
 for every actor driven by <em class="parameter"><code>behave</code></em>
.</p>
<div class="refsect3">
<a name="id-1.11.5.10.7.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>behave</p></td>
<td class="parameter_description"><p>a <a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>func</p></td>
<td class="parameter_description"><p> a function called for each actor. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="The callback is valid only during the call to the method."><span class="acronym">scope call</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>data</p></td>
<td class="parameter_description"><p>optional data to be passed to the function, or <code class="literal">NULL</code></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix03.html#api-index-0.2">0.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-behaviour-get-actors"></a><h3>clutter_behaviour_get_actors ()</h3>
<pre class="programlisting"><span class="returnvalue">GSList</span> *
clutter_behaviour_get_actors (<em class="parameter"><code><a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> *behave</code></em>);</pre>
<div class="warning"><p><code class="literal">clutter_behaviour_get_actors</code> has been deprecated since version 1.6 and should not be used in newly-written code.</p></div>
<p>Retrieves all the actors to which <em class="parameter"><code>behave</code></em>
 applies. It is not recommended
for derived classes to use this in there alpha notify method but use 
<a class="link" href="ClutterBehaviour.html#clutter-behaviour-actors-foreach" title="clutter_behaviour_actors_foreach ()"><span class="type">clutter_behaviour_actors_foreach</span></a> as it avoids alot of needless allocations.</p>
<div class="refsect3">
<a name="id-1.11.5.10.8.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>behave</p></td>
<td class="parameter_description"><p>a <a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.11.5.10.8.8"></a><h4>Returns</h4>
<p> a list of
actors. You should free the returned list with <code class="function">g_slist_free()</code> when
finished using it. </p>
<p><span class="annotation">[<acronym title="Free data container after the code is done."><span class="acronym">transfer container</span></acronym>][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> Clutter.Actor]</span></p>
</div>
<p class="since">Since: <a class="link" href="ix03.html#api-index-0.2">0.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-behaviour-get-n-actors"></a><h3>clutter_behaviour_get_n_actors ()</h3>
<pre class="programlisting"><span class="returnvalue">gint</span>
clutter_behaviour_get_n_actors (<em class="parameter"><code><a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> *behave</code></em>);</pre>
<div class="warning"><p><code class="literal">clutter_behaviour_get_n_actors</code> has been deprecated since version 1.6 and should not be used in newly-written code.</p></div>
<p>Gets the number of actors this behaviour is applied too.</p>
<div class="refsect3">
<a name="id-1.11.5.10.9.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>behave</p></td>
<td class="parameter_description"><p>a <a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.11.5.10.9.8"></a><h4>Returns</h4>
<p> The number of applied actors </p>
</div>
<p class="since">Since: <a class="link" href="ix03.html#api-index-0.2">0.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-behaviour-get-nth-actor"></a><h3>clutter_behaviour_get_nth_actor ()</h3>
<pre class="programlisting"><a class="link" href="ClutterActor.html" title="ClutterActor"><span class="returnvalue">ClutterActor</span></a> *
clutter_behaviour_get_nth_actor (<em class="parameter"><code><a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> *behave</code></em>,
                                 <em class="parameter"><code><span class="type">gint</span> index_</code></em>);</pre>
<div class="warning"><p><code class="literal">clutter_behaviour_get_nth_actor</code> has been deprecated since version 1.6 and should not be used in newly-written code.</p></div>
<p>Gets an actor the behaviour was applied to referenced by index num.</p>
<div class="refsect3">
<a name="id-1.11.5.10.10.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>behave</p></td>
<td class="parameter_description"><p>a <a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>index_</p></td>
<td class="parameter_description"><p>the index of an actor this behaviour is applied too. </p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.11.5.10.10.8"></a><h4>Returns</h4>
<p> A Clutter actor or NULL if <em class="parameter"><code>index_</code></em>
is invalid. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="ix03.html#api-index-0.2">0.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-behaviour-get-alpha"></a><h3>clutter_behaviour_get_alpha ()</h3>
<pre class="programlisting"><a class="link" href="ClutterAlpha.html" title="ClutterAlpha"><span class="returnvalue">ClutterAlpha</span></a> *
clutter_behaviour_get_alpha (<em class="parameter"><code><a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> *behave</code></em>);</pre>
<div class="warning"><p><code class="literal">clutter_behaviour_get_alpha</code> has been deprecated since version 1.6 and should not be used in newly-written code.</p></div>
<p>Retrieves the <a class="link" href="ClutterAlpha.html" title="ClutterAlpha"><span class="type">ClutterAlpha</span></a> object bound to <em class="parameter"><code>behave</code></em>
.</p>
<div class="refsect3">
<a name="id-1.11.5.10.11.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>behave</p></td>
<td class="parameter_description"><p>a <a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.11.5.10.11.8"></a><h4>Returns</h4>
<p> a <a class="link" href="ClutterAlpha.html" title="ClutterAlpha"><span class="type">ClutterAlpha</span></a> object, or <code class="literal">NULL</code> if no alpha
object has been bound to this behaviour. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="ix03.html#api-index-0.2">0.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-behaviour-set-alpha"></a><h3>clutter_behaviour_set_alpha ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
clutter_behaviour_set_alpha (<em class="parameter"><code><a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> *behave</code></em>,
                             <em class="parameter"><code><a class="link" href="ClutterAlpha.html" title="ClutterAlpha"><span class="type">ClutterAlpha</span></a> *alpha</code></em>);</pre>
<div class="warning"><p><code class="literal">clutter_behaviour_set_alpha</code> has been deprecated since version 1.6 and should not be used in newly-written code.</p></div>
<p>Binds <em class="parameter"><code>alpha</code></em>
 to a <a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a>. The <a class="link" href="ClutterAlpha.html" title="ClutterAlpha"><span class="type">ClutterAlpha</span></a> object
is what makes a behaviour work: for each tick of the timeline
used by <a class="link" href="ClutterAlpha.html" title="ClutterAlpha"><span class="type">ClutterAlpha</span></a> a new value of the alpha parameter is
computed by the alpha function; the value should be used by
the <a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> to update one or more properties of the
actors to which the behaviour applies.</p>
<p>If <em class="parameter"><code>alpha</code></em>
 is not <code class="literal">NULL</code>, the <a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> will take ownership
of the <a class="link" href="ClutterAlpha.html" title="ClutterAlpha"><span class="type">ClutterAlpha</span></a> instance.</p>
<div class="refsect3">
<a name="id-1.11.5.10.12.8"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>behave</p></td>
<td class="parameter_description"><p>a <a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>alpha</p></td>
<td class="parameter_description"><p>a <a class="link" href="ClutterAlpha.html" title="ClutterAlpha"><span class="type">ClutterAlpha</span></a> or <code class="literal">NULL</code> to unset a previously set alpha</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix03.html#api-index-0.2">0.2</a></p>
</div>
</div>
<div class="refsect1">
<a name="ClutterBehaviour.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="ClutterBehaviour-struct"></a><h3>ClutterBehaviour</h3>
<pre class="programlisting">typedef struct _ClutterBehaviour ClutterBehaviour;</pre>
<div class="warning"><p><code class="literal">ClutterBehaviour</code> has been deprecated since version 1.6 and should not be used in newly-written code.</p></div>
<p><a class="link" href="ClutterBehaviour.html#ClutterBehaviour-struct" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> contains only private data and should
be accessed with the functions below.</p>
<p class="since">Since: <a class="link" href="ix03.html#api-index-0.2">0.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="ClutterBehaviourClass"></a><h3>struct ClutterBehaviourClass</h3>
<pre class="programlisting">struct ClutterBehaviourClass {
  /* vfunc, not signal */
  void (*alpha_notify) (ClutterBehaviour *behave,
                        gdouble           alpha_value);

  /* signals */
  void (*applied)  (ClutterBehaviour *behave,
		    ClutterActor     *actor);
  void (*removed)  (ClutterBehaviour *behave,
		    ClutterActor     *actor);
};
</pre>
<div class="warning"><p><code class="literal">ClutterBehaviourClass</code> has been deprecated since version 1.6 and should not be used in newly-written code.</p></div>
<p>Base class for behaviours.</p>
<div class="refsect3">
<a name="id-1.11.5.11.3.7"></a><h4>Members</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="ClutterBehaviourClass.alpha-notify"></a>alpha_notify</code></em> ()</p></td>
<td class="struct_member_description"><p>virtual function, called each time the <a class="link" href="ClutterAlpha.html" title="ClutterAlpha"><span class="type">ClutterAlpha</span></a>
computes a new alpha value; the actors to which the behaviour applies
should be changed in this function. Every subclass of <a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a>
must implement this virtual function</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="ClutterBehaviourClass.applied"></a>applied</code></em> ()</p></td>
<td class="struct_member_description"><p>signal class handler for the ClutterBehaviour::applied signal</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="ClutterBehaviourClass.removed"></a>removed</code></em> ()</p></td>
<td class="struct_member_description"><p>signal class handler for the ClutterBehaviour::removed signal</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix03.html#api-index-0.2">0.2</a></p>
</div>
</div>
<div class="refsect1">
<a name="ClutterBehaviour.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="ClutterBehaviour--alpha"></a><h3>The <code class="literal">“alpha”</code> property</h3>
<pre class="programlisting">  “alpha”                    <a class="link" href="ClutterAlpha.html" title="ClutterAlpha"><span class="type">ClutterAlpha</span></a> *</pre>
<p>The <a class="link" href="ClutterAlpha.html" title="ClutterAlpha"><span class="type">ClutterAlpha</span></a> object used to drive this behaviour. A <a class="link" href="ClutterAlpha.html" title="ClutterAlpha"><span class="type">ClutterAlpha</span></a>
object binds a <a class="link" href="ClutterTimeline.html" title="ClutterTimeline"><span class="type">ClutterTimeline</span></a> and a function which computes a value
(the "alpha") depending on the time. Each time the alpha value changes
the alpha-notify virtual function is called.</p>
<div class="warning"><p><code class="literal">ClutterBehaviour:alpha</code> has been deprecated since version 1.6 and should not be used in newly-written code.</p></div>
<p>Flags: Read / Write</p>
<p class="since">Since: <a class="link" href="ix03.html#api-index-0.2">0.2</a></p>
</div>
</div>
<div class="refsect1">
<a name="ClutterBehaviour.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2">
<a name="ClutterBehaviour-applied"></a><h3>The <code class="literal">“applied”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
user_function (<a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> *behaviour,
               <a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a>     *actor,
               <span class="type">gpointer</span>          user_data)</pre>
<p>The ::apply signal is emitted each time the behaviour is applied
to an actor.</p>
<div class="warning"><p><code class="literal">ClutterBehaviour::applied</code> has been deprecated since version 1.6 and should not be used in newly-written code.</p></div>
<div class="refsect3">
<a name="id-1.11.5.13.2.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>behaviour</p></td>
<td class="parameter_description"><p>the <a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> that received the signal</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>actor</p></td>
<td class="parameter_description"><p>the actor the behaviour was applied to.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p>Flags: Run First</p>
<p class="since">Since: <a class="link" href="ix04.html#api-index-0.4">0.4</a></p>
</div>
<hr>
<div class="refsect2">
<a name="ClutterBehaviour-removed"></a><h3>The <code class="literal">“removed”</code> signal</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
user_function (<a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> *behaviour,
               <a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a>     *actor,
               <span class="type">gpointer</span>          user_data)</pre>
<p>The ::removed signal is emitted each time a behaviour is not applied
to an actor anymore.</p>
<div class="warning"><p><code class="literal">ClutterBehaviour::removed</code> has been deprecated since version 1.6 and should not be used in newly-written code.</p></div>
<div class="refsect3">
<a name="id-1.11.5.13.3.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>behaviour</p></td>
<td class="parameter_description"><p>the <a class="link" href="ClutterBehaviour.html" title="ClutterBehaviour"><span class="type">ClutterBehaviour</span></a> that received the signal</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>actor</p></td>
<td class="parameter_description"><p>the removed actor</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data set when the signal handler was connected.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p>Flags: Run First</p>
<p class="since">Since: <a class="link" href="ix04.html#api-index-0.4">0.4</a></p>
</div>
</div>
</div>
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