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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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                  <a href="#GritsCallback.description" class="shortcut">Description</a>
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<a name="GritsCallback"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="GritsCallback.top_of_page"></a>GritsCallback</span></h2>
<p>GritsCallback — Custom callback objects</p>
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<div class="refsynopsisdiv">
<a name="GritsCallback.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">struct              <a class="link" href="GritsCallback.html#GritsCallback-struct" title="struct GritsCallback">GritsCallback</a>;
struct              <a class="link" href="GritsCallback.html#GritsCallbackClass" title="struct GritsCallbackClass">GritsCallbackClass</a>;
<span class="returnvalue">void</span>                (<a class="link" href="GritsCallback.html#GritsCallbackFunc" title="GritsCallbackFunc ()">*GritsCallbackFunc</a>)                (<em class="parameter"><code><a class="link" href="GritsCallback.html" title="GritsCallback"><span class="type">GritsCallback</span></a> *callback</code></em>,
                                                         <em class="parameter"><code><a class="link" href="GritsOpenGL.html" title="GritsOpenGL"><span class="type">GritsOpenGL</span></a> *opengl</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
<a class="link" href="GritsCallback.html" title="GritsCallback"><span class="returnvalue">GritsCallback</span></a> *     <a class="link" href="GritsCallback.html#grits-callback-new" title="grits_callback_new ()">grits_callback_new</a>                  (<em class="parameter"><code><a class="link" href="GritsCallback.html#GritsCallbackFunc" title="GritsCallbackFunc ()"><span class="type">GritsCallbackFunc</span></a> draw_cb</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="GritsCallback.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
  <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>
   +----<a class="link" href="GritsObject.html" title="GritsObject">GritsObject</a>
         +----GritsCallback
</pre>
</div>
<div class="refsect1">
<a name="GritsCallback.description"></a><h2>Description</h2>
<p>
<a class="link" href="GritsCallback.html" title="GritsCallback"><span class="type">GritsCallback</span></a> objects are used for custom drawing functions. A common example
of this would be to render something which does not easily fit into a normal
object. For instance, a Heads-Up-Display overlay.
</p>
<p>
Callbacks are an alternate to extending GritsObject with a new class and
should be used when only once instance of the object will be needed.
</p>
</div>
<div class="refsect1">
<a name="GritsCallback.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GritsCallback-struct"></a><h3>struct GritsCallback</h3>
<pre class="programlisting">struct GritsCallback;</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="GritsCallbackClass"></a><h3>struct GritsCallbackClass</h3>
<pre class="programlisting">struct GritsCallbackClass {
	GritsObjectClass parent_class;
};
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="GritsCallbackFunc"></a><h3>GritsCallbackFunc ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                (*GritsCallbackFunc)                (<em class="parameter"><code><a class="link" href="GritsCallback.html" title="GritsCallback"><span class="type">GritsCallback</span></a> *callback</code></em>,
                                                         <em class="parameter"><code><a class="link" href="GritsOpenGL.html" title="GritsOpenGL"><span class="type">GritsOpenGL</span></a> *opengl</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
A function to be called when the callback object is being rendered
</p>
<div class="variablelist"><table border="0" class="variablelist">
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<td><p><span class="term"><em class="parameter"><code>callback</code></em> :</span></p></td>
<td>the callback object to be drawn</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>the user data associated with the callback</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="grits-callback-new"></a><h3>grits_callback_new ()</h3>
<pre class="programlisting"><a class="link" href="GritsCallback.html" title="GritsCallback"><span class="returnvalue">GritsCallback</span></a> *     grits_callback_new                  (<em class="parameter"><code><a class="link" href="GritsCallback.html#GritsCallbackFunc" title="GritsCallbackFunc ()"><span class="type">GritsCallbackFunc</span></a> draw_cb</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
Create a <a class="link" href="GritsCallback.html" title="GritsCallback"><span class="type">GritsCallback</span></a> object with an associated function and user data.
</p>
<div class="variablelist"><table border="0" class="variablelist">
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</colgroup>
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<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data to pass to the drawing function</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new <a class="link" href="GritsCallback.html" title="GritsCallback"><span class="type">GritsCallback</span></a>
</td>
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