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<title>Clutter Reference Manual: Glossary</title>
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<div class="glossary">
<div class="titlepage"><div><div><h2 class="title">
<a name="id-1.12.2"></a>Glossary</h2></div></div></div>
<dl>
<dt>
<a name="actor"></a><span class="glossterm">actor</span>
</dt>
<dd class="glossdef"><p>An item on the <a class="glossterm" href="go01.html#scenegraph"><em class="glossterm">scenegraph</em></a>. Every
actor has a <a class="glossterm" href="go01.html#parent"><em class="glossterm">parent</em></a>, except the <a class="glossterm" href="go01.html#stage"><em class="glossterm">stage</em></a>, and some actors can be <a class="glossterm" href="go01.html#container"><em class="glossterm">containers</em></a>. Every actor has a <a class="glossterm" href="go01.html#geometry"><em class="glossterm">geometry</em></a> and, when visible, it should paint its
contents. The base class for actors is <a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a>.</p></dd>
<dt>
<a name="allocation"></a><span class="glossterm">allocation</span>
</dt>
<dd class="glossdef">
<p>The final size of an <a class="glossterm" href="go01.html#actor"><em class="glossterm">actor</em></a> within its
<a class="glossterm" href="go01.html#parent"><em class="glossterm">parent</em></a>. For example, an actor might have
a preferred <a class="glossterm" href="go01.html#minimum-size"><em class="glossterm">minimum size</em></a> of
20×20 pixels and a <a class="glossterm" href="go01.html#natural-size"><em class="glossterm">natural
size</em></a> of
40×40 pixels, but its parent may decide to allocate 50×20 pixels for
it instead.</p>
<p>See Also
<a class="glossterm" href="go01.html#minimum-size"><em class="glossterm">minimum size</em></a>
<a class="glossterm" href="go01.html#natural-size"><em class="glossterm">natural size</em></a>
.</p>
</dd>
<dt>
<a name="child"></a><span class="glossterm">child</span>
</dt>
<dd class="glossdef"><p>A <a class="glossterm" href="go01.html#container"><em class="glossterm">container's</em></a> child is an
<a class="glossterm" href="go01.html#actor"><em class="glossterm">actor</em></a> contained inside it.</p></dd>
<dt>
<a name="container"></a><span class="glossterm">container</span>
</dt>
<dd class="glossdef"><p>An <a class="glossterm" href="go01.html#actor"><em class="glossterm">actor</em></a> which can contain other
actors. If a container is meant to be extended using public API it should implement
the <a class="link" href="ClutterContainer.html" title="ClutterContainer"><span class="type">ClutterContainer</span></a> interface; otherwise it is a composite actor. A container
can let its <a class="glossterm" href="go01.html#child"><em class="glossterm">children</em></a> manage their <a class="glossterm" href="go01.html#geometry"><em class="glossterm">geometry</em></a>, like <a class="link" href="ClutterGroup.html" title="ClutterGroup"><span class="type">ClutterGroup</span></a>, or they can take care of
assigning one.</p></dd>
<dt>
<a name="event"></a><span class="glossterm">event</span>
</dt>
<dd class="glossdef"><p>Events are the way in which the Clutter backend informs Clutter about external
events like pointer motion, button clicks, key presses, etc.</p></dd>
<dt>
<a name="geometry"></a><span class="glossterm">geometry</span>
</dt>
<dd class="glossdef"><p>An <a class="glossterm" href="go01.html#actor"><em class="glossterm">actor's</em></a> position and size. A
geometry can be expressed in <a class="glossterm" href="go01.html#actor"><em class="glossterm">actor-relative</em></a>
<a class="glossterm" href="go01.html#transformation"><em class="glossterm">untransformed</em></a> coordinates; or in
<a class="glossterm" href="go01.html#stage"><em class="glossterm">stage-relative</em></a>, <a class="glossterm" href="go01.html#transformation"><em class="glossterm">transformed</em></a> coordinates.</p></dd>
<dt>
<a name="minimum-size"></a><span class="glossterm">minimum size</span>
</dt>
<dd class="glossdef">
<p>The minimum, useful size of an <a class="glossterm" href="go01.html#actor"><em class="glossterm">actor</em></a>.
For instance, a button might have a minimum size of 20×20 millimeters on a
touch screen, to retain the ability for the user to press it. A <a class="glossterm" href="go01.html#container"><em class="glossterm">container</em></a> that manages the size of its <a class="glossterm" href="go01.html#child"><em class="glossterm">children</em></a> should always try to <a class="glossterm" href="go01.html#allocation"><em class="glossterm">allocate</em></a> at least their minimum size.</p>
<p>See Also
<a class="glossterm" href="go01.html#natural-size"><em class="glossterm">natural size</em></a>
<a class="glossterm" href="go01.html#allocation"><em class="glossterm">allocation</em></a>
.</p>
</dd>
<dt>
<a name="natural-size"></a><span class="glossterm">natural size</span>
</dt>
<dd class="glossdef">
<p>The default size requested by an <a class="glossterm" href="go01.html#actor"><em class="glossterm">actor</em></a>.</p>
<p>See Also
<a class="glossterm" href="go01.html#minimum-size"><em class="glossterm">minimum size</em></a>
<a class="glossterm" href="go01.html#allocation"><em class="glossterm">allocation</em></a>
.</p>
</dd>
<dt>
<a name="parent"></a><span class="glossterm">parent</span>
</dt>
<dd class="glossdef"><p>An <a class="glossterm" href="go01.html#actor"><em class="glossterm">actor's</em></a> parent is the
<a class="glossterm" href="go01.html#container"><em class="glossterm">container</em></a> inside which the actor
resides.</p></dd>
<dt>
<a name="scenegraph"></a><span class="glossterm">scenegraph</span>
</dt>
<dd class="glossdef"><p>The tree of all <a class="glossterm" href="go01.html#actor"><em class="glossterm">actors</em></a>, starting
from the <a class="glossterm" href="go01.html#stage"><em class="glossterm">stage</em></a> at the root and following
the <a class="glossterm" href="go01.html#container"><em class="glossterm">containers</em></a>.</p></dd>
<dt>
<a name="stage"></a><span class="glossterm">stage</span>
</dt>
<dd class="glossdef"><p>The top-level <a class="glossterm" href="go01.html#container"><em class="glossterm">container</em></a> for
<a class="glossterm" href="go01.html#actor"><em class="glossterm">actors</em></a>. Depending on the Clutter back end a
stage can be associated to a window or to a frame buffer; also depending on the back
end is the number of instantiatable stages. Stages in Clutter can be manipulated using
the <a class="link" href="ClutterStage.html" title="ClutterStage"><span class="type">ClutterStage</span></a> API.</p></dd>
<dt>
<a name="transformation"></a><span class="glossterm">transformation</span>
</dt>
<dd class="glossdef"><p>A rotation, scaling or traslation of an <a class="glossterm" href="go01.html#actor"><em class="glossterm">actor</em></a>. Transformations are independent
of the actor's <a class="glossterm" href="go01.html#geometry"><em class="glossterm">geometry</em></a>.</p></dd>
</dl>
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