~oem-solutions-group/unity-2d/clutter-1.0

<p>In order to implement a new <a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a> subclass the usual

machinery for subclassing a <a

href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject"

><span class="type">GObject</span></a> should be used:</p>

machinery for subclassing a <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> should be used:</p>

#define FOO_TYPE_ACTOR (foo_actor_get_type ())

#define FOO_ACTOR(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), FOO_TYPE_ACTOR, FooActor))

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truncate the precision of the computed values.</p>

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</div>

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<a name="clutter-actor-get-width-request-example"></a><p class="title"><b>Example 1. Width requisition implementation of a container</b></p>

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<a name="clutter-actor-get-width-request-example"></a><p class="title"><b>Example 8. Width requisition implementation of a container</b></p>

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<p>This example shows how an actor class should override the

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<code class="function">get_preferred_width()</code> virtual function of <a class="link" href="ClutterActor.html" title="ClutterActor"><span class="type">ClutterActor</span></a>. In this case,

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<p>The <code class="function">allocate()</code> virtual function implementation will be

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notified whether the actor has been moved, while <a class="link" href="ClutterActor.html#clutter-actor-allocate" title="clutter_actor_allocate ()"><code class="function">clutter_actor_allocate()</code></a>

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will usually be invoked with the <a class="link" href="ClutterActor.html#CLUTTER-ABSOLUTE-ORIGIN-CHANGED--CAPS"><code class="literal">CLUTTER_ABSOLUTE_ORIGIN_CHANGED</code></a> flag,

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will usually be invoked with the <a class="link" href="ClutterActor.html#CLUTTER-ABSOLUTE-ORIGIN-CHANGED:CAPS"><code class="literal">CLUTTER_ABSOLUTE_ORIGIN_CHANGED</code></a> flag,

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meaning that the parent has been moved.</p>

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</div>

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<a name="container-allocate-example"></a><p class="title"><b>Example 2. Allocation of a container</b></p>

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<a name="container-allocate-example"></a><p class="title"><b>Example 9. Allocation of a container</b></p>

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<p>In this example, <code class="classname">FooActor</code> acts like a

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horizontal box with overflowing, like a toolbar which will display

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using the Clutter GL and GLES abstraction library (COGL) or by directly

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using the GL or GLES API.</p>

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<a name="simple-actor-paint-example"></a><p class="title"><b>Example 3. Paint implementation of a simple actor</b></p>

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<a name="simple-actor-paint-example"></a><p class="title"><b>Example 10. Paint implementation of a simple actor</b></p>

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<p>In this example, the <code class="classname">FooActor</code>

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implementation of the <code class="function">paint()</code> virtual function is drawing a rectangle

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also override the paint method, and call <a class="link" href="ClutterActor.html#clutter-actor-paint" title="clutter_actor_paint ()"><code class="function">clutter_actor_paint()</code></a> on every

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visible child:</p>

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<a name="container-actor-paint-example"></a><p class="title"><b>Example 4. Paint implementation of a container</b></p>

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<a name="container-actor-paint-example"></a><p class="title"><b>Example 11. Paint implementation of a container</b></p>

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<p>In this example, <code class="classname">FooActor</code> is a simple

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container invoking <a class="link" href="ClutterActor.html#clutter-actor-paint" title="clutter_actor_paint ()"><code class="function">clutter_actor_paint()</code></a> on every visible child.</p>

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overridden. The <code class="function">pick()</code> method works exactly like the <code class="function">paint()</code> method, but

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the actor should paint just its shape with the passed colour:</p>

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<a name="simple-actor-pick-example"></a><p class="title"><b>Example 5. Pick implementation of a simple actor</b></p>

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<a name="simple-actor-pick-example"></a><p class="title"><b>Example 12. Pick implementation of a simple actor</b></p>

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<p>In this example, <code class="classname">FooActor</code> overrides the

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<code class="function">pick()</code> virtual function default implementation to paint itself with a

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<code class="function">pick()</code> implementation to get their silhouette painted and then

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paint their children:</p>

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<a name="container-actor-pick-example"></a><p class="title"><b>Example 6. Pick implementation of a container</b></p>

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<a name="container-actor-pick-example"></a><p class="title"><b>Example 13. Pick implementation of a container</b></p>

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<p>In this example, <code class="classname">FooActor</code> allows the

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picking of each child it contains, as well as itself.</p>

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<a class="link" href="ClutterActor.html#clutter-actor-set-parent" title="clutter_actor_set_parent ()"><code class="function">clutter_actor_set_parent()</code></a>:

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</p>

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<a name="clutter-actor-set-parent-example"></a><p class="title"><b>Example 7. Parenting an actor</b></p>

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<a name="clutter-actor-set-parent-example"></a><p class="title"><b>Example 14. Parenting an actor</b></p>

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<p>In this example, <code class="classname">FooActor</code> has an internal

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child of type <code class="classname">BazActor</code> which is assigned using a

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