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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>Clutter Reference Manual: ClutterChildMeta</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
<link rel="home" href="index.html" title="Clutter Reference Manual">
<link rel="up" href="ch01.html" title="Abstract classes and interfaces">
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</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="10"><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="#ClutterChildMeta.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span> 
                  <a href="#ClutterChildMeta.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_properties"> <span class="dim">|</span> 
                  <a href="#ClutterChildMeta.properties" class="shortcut">Properties</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="ch01.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
<td><a accesskey="p" href="ClutterContainer.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td>
<td><a accesskey="n" href="ClutterMedia.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td>
</tr></table>
<div class="refentry">
<a name="ClutterChildMeta"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="ClutterChildMeta.top_of_page"></a>ClutterChildMeta</span></h2>
<p>ClutterChildMeta — Wrapper for actors inside a container</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="ClutterChildMeta.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">
<a class="link" href="ClutterContainer.html" title="ClutterContainer"><span class="returnvalue">ClutterContainer</span></a> *
</td>
<td class="function_name">
<a class="link" href="ClutterChildMeta.html#clutter-child-meta-get-container" title="clutter_child_meta_get_container ()">clutter_child_meta_get_container</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="ClutterChildMeta.html#clutter-child-meta-get-actor" title="clutter_child_meta_get_actor ()">clutter_child_meta_get_actor</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="ClutterChildMeta.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="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a> *</td>
<td class="property_name"><a class="link" href="ClutterChildMeta.html#ClutterChildMeta--actor" title="The “actor” property">actor</a></td>
<td class="property_flags">Read / Write / Construct Only</td>
</tr>
<tr>
<td class="property_type">
<a class="link" href="ClutterContainer.html" title="ClutterContainer"><span class="type">ClutterContainer</span></a> *</td>
<td class="property_name"><a class="link" href="ClutterChildMeta.html#ClutterChildMeta--container" title="The “container” property">container</a></td>
<td class="property_flags">Read / Write / Construct Only</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="ClutterChildMeta.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="ClutterChildMeta.html#ClutterChildMeta-struct" title="ClutterChildMeta">ClutterChildMeta</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="ClutterChildMeta.html#ClutterChildMetaClass" title="struct ClutterChildMetaClass">ClutterChildMetaClass</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="ClutterChildMeta.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    GObject
    <span class="lineart">╰──</span> ClutterChildMeta
        <span class="lineart">╰──</span> <a class="link" href="ClutterLayoutMeta.html" title="ClutterLayoutMeta">ClutterLayoutMeta</a>
</pre>
</div>
<div class="refsect1">
<a name="ClutterChildMeta.description"></a><h2>Description</h2>
<p><a class="link" href="ClutterChildMeta.html" title="ClutterChildMeta"><span class="type">ClutterChildMeta</span></a> is a wrapper object created by <a class="link" href="ClutterContainer.html" title="ClutterContainer"><span class="type">ClutterContainer</span></a>
implementations in order to store child-specific data and properties.</p>
<p>A <a class="link" href="ClutterChildMeta.html" title="ClutterChildMeta"><span class="type">ClutterChildMeta</span></a> wraps a <a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a> inside a <a class="link" href="ClutterContainer.html" title="ClutterContainer"><span class="type">ClutterContainer</span></a>.</p>
<p><a class="link" href="ClutterChildMeta.html" title="ClutterChildMeta"><span class="type">ClutterChildMeta</span></a> is available since Clutter 0.8</p>
</div>
<div class="refsect1">
<a name="ClutterChildMeta.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="clutter-child-meta-get-container"></a><h3>clutter_child_meta_get_container ()</h3>
<pre class="programlisting"><a class="link" href="ClutterContainer.html" title="ClutterContainer"><span class="returnvalue">ClutterContainer</span></a> *
clutter_child_meta_get_container (<em class="parameter"><code><a class="link" href="ClutterChildMeta.html" title="ClutterChildMeta"><span class="type">ClutterChildMeta</span></a> *data</code></em>);</pre>
<p>Retrieves the container using <em class="parameter"><code>data</code></em>
</p>
<div class="refsect3">
<a name="id-1.5.2.4.8.2.5"></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>data</p></td>
<td class="parameter_description"><p>a <a class="link" href="ClutterChildMeta.html" title="ClutterChildMeta"><span class="type">ClutterChildMeta</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.5.2.4.8.2.6"></a><h4>Returns</h4>
<p> a <a class="link" href="ClutterContainer.html" title="ClutterContainer"><span class="type">ClutterContainer</span></a>. </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 0.8</p>
</div>
<hr>
<div class="refsect2">
<a name="clutter-child-meta-get-actor"></a><h3>clutter_child_meta_get_actor ()</h3>
<pre class="programlisting"><a class="link" href="ClutterActor.html" title="ClutterActor"><span class="returnvalue">ClutterActor</span></a> *
clutter_child_meta_get_actor (<em class="parameter"><code><a class="link" href="ClutterChildMeta.html" title="ClutterChildMeta"><span class="type">ClutterChildMeta</span></a> *data</code></em>);</pre>
<p>Retrieves the actor wrapped by <em class="parameter"><code>data</code></em>
</p>
<div class="refsect3">
<a name="id-1.5.2.4.8.3.5"></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>data</p></td>
<td class="parameter_description"><p>a <a class="link" href="ClutterChildMeta.html" title="ClutterChildMeta"><span class="type">ClutterChildMeta</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.5.2.4.8.3.6"></a><h4>Returns</h4>
<p> a <a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a>. </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 0.8</p>
</div>
</div>
<div class="refsect1">
<a name="ClutterChildMeta.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="ClutterChildMeta-struct"></a><h3>ClutterChildMeta</h3>
<pre class="programlisting">typedef struct {
  ClutterContainer *container;
  ClutterActor *actor;
} ClutterChildMeta;
</pre>
<p>Base interface for container specific state for child actors. A child
data is meant to be used when you need to keep track of information
about each individual child added to a container.</p>
<p>In order to use it you should create your own subclass of
<a class="link" href="ClutterChildMeta.html" title="ClutterChildMeta"><span class="type">ClutterChildMeta</span></a> and set the <a class="link" href="ClutterContainer.html#ClutterContainerIface" title="struct ClutterContainerIface"><span class="type">ClutterContainerIface</span></a> child_meta_type
interface member to your subclass type, like:</p>
<div class="informalexample"><pre class="programlisting">
static void
my_container_iface_init (ClutterContainerIface *iface)
{
  /* set the rest of the #ClutterContainer vtable */

  container_iface-&gt;child_meta_type  = MY_TYPE_CHILD_META;
}
</pre></div>
<p></p>
<p>This will automatically create a <a class="link" href="ClutterChildMeta.html" title="ClutterChildMeta"><span class="type">ClutterChildMeta</span></a> of type
MY_TYPE_CHILD_META for every actor that is added to the container.</p>
<p>The child data for an actor can be retrieved using the
<a class="link" href="ClutterContainer.html#clutter-container-get-child-meta" title="clutter_container_get_child_meta ()"><code class="function">clutter_container_get_child_meta()</code></a> function.</p>
<p>The properties of the data and your subclass can be manipulated with
<a class="link" href="ClutterContainer.html#clutter-container-child-set" title="clutter_container_child_set ()"><code class="function">clutter_container_child_set()</code></a> and <a class="link" href="ClutterContainer.html#clutter-container-child-get" title="clutter_container_child_get ()"><code class="function">clutter_container_child_get()</code></a> which
act like <code class="function">g_object_set()</code> and <code class="function">g_object_get()</code>.</p>
<p>You can provide hooks for your own storage as well as control the
instantiation by overriding the <a class="link" href="ClutterContainer.html#ClutterContainerIface" title="struct ClutterContainerIface"><span class="type">ClutterContainerIface</span></a> virtual functions
<code class="function">create_child_meta</code>,
<code class="function">destroy_child_meta</code>,
and <code class="function">get_child_meta</code>.</p>
<div class="refsect3">
<a name="id-1.5.2.4.9.2.12"></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><a class="link" href="ClutterContainer.html" title="ClutterContainer"><span class="type">ClutterContainer</span></a> *<em class="structfield"><code><a name="ClutterChildMeta-struct.container"></a>container</code></em>;</p></td>
<td class="struct_member_description"><p>the container handling this data</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a> *<em class="structfield"><code><a name="ClutterChildMeta-struct.actor"></a>actor</code></em>;</p></td>
<td class="struct_member_description"><p>the actor wrapped by this data</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since 0.8</p>
</div>
<hr>
<div class="refsect2">
<a name="ClutterChildMetaClass"></a><h3>struct ClutterChildMetaClass</h3>
<pre class="programlisting">struct ClutterChildMetaClass {
};
</pre>
<p>The <a class="link" href="ClutterChildMeta.html#ClutterChildMetaClass" title="struct ClutterChildMetaClass"><span class="type">ClutterChildMetaClass</span></a> contains only private data</p>
<p class="since">Since 0.8</p>
</div>
</div>
<div class="refsect1">
<a name="ClutterChildMeta.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="ClutterChildMeta--actor"></a><h3>The <code class="literal">“actor”</code> property</h3>
<pre class="programlisting">  “actor”                    <a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a> *</pre>
<p>The <a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a> being wrapped by this <a class="link" href="ClutterChildMeta.html" title="ClutterChildMeta"><span class="type">ClutterChildMeta</span></a></p>
<p>Flags: Read / Write / Construct Only</p>
<p class="since">Since 0.8</p>
</div>
<hr>
<div class="refsect2">
<a name="ClutterChildMeta--container"></a><h3>The <code class="literal">“container”</code> property</h3>
<pre class="programlisting">  “container”                <a class="link" href="ClutterContainer.html" title="ClutterContainer"><span class="type">ClutterContainer</span></a> *</pre>
<p>The <a class="link" href="ClutterContainer.html" title="ClutterContainer"><span class="type">ClutterContainer</span></a> that created this <a class="link" href="ClutterChildMeta.html" title="ClutterChildMeta"><span class="type">ClutterChildMeta</span></a>.</p>
<p>Flags: Read / Write / Construct Only</p>
<p class="since">Since 0.8</p>
</div>
</div>
</div>
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