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docs: Document animating action and constraint properties

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Add a refsect for the syntax to be used when animating action and
constraint properties with ClutterAnimation.
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Emmanuele Bassi 2010-05-19 15:09:47 +01:00
parent 9f7e4b2b64
commit 52acc71161
1 changed files with 59 additions and 0 deletions
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clutter/clutter-actor.c
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@ -155,6 +155,65 @@
* should read the documentation for the #ClutterUnits parser format for * should read the documentation for the #ClutterUnits parser format for
* the valid units and syntax.</para> * the valid units and syntax.</para>
* </refsect2> * </refsect2>
*
* <refsect2 id="ClutterActor-animating">
* <title>Custom animatable properties</title>
* <para>#ClutterActor allows accessing properties of #ClutterAction
* and #ClutterConstraint instances associated to an actor instance
* for animation purposes.</para>
* <para>In order to access a specific #ClutterAction or a #ClutterConstraint
* property it is necessary to set the #ClutterActorMeta:name property on the
* given action or constraint.</para>
* <para>The property can be accessed using the the following syntax:</para>
* <informalexample>
* <programlisting>
* @&lt;section&gt;.&lt;meta-name&gt;.&lt;property-name&gt;
* </programlisting>
* </informalexample>
* <para>The initial <emphasis>@</emphasis> is mandatory.</para>
* <para>The <emphasis>section</emphasis> fragment can be one between
* "actions" or "constraints".</para>
* <para>The <emphasis>meta-name</emphasis> fragment is the name of the
* action or constraint, as specified by the #ClutterActorMeta:name
* property.</para>
* <para>The <emphasis>property-name</emphasis> fragment is the name of the
* action or constraint property to be animated.</para>
* <example id="example-ClutterActor-animating-meta">
* <title>Animating a constraint property</title>
* <para>The example below animates a #ClutterBindConstraint applied to an
* actor using clutter_actor_animate(). The <emphasis>rect</emphasis> has
* a binding constraint for the <emphasis>origin</emphasis> actor, and in
* its initial state is fully transparent and overlapping the actor to
* which is bound to. </para>
* <programlisting>
* constraint = clutter_bind_constraint_new (origin, CLUTTER_BIND_X, 0.0);
* clutter_actor_meta_set_name (CLUTTER_ACTOR_META (constraint), "bind-x");
* clutter_actor_add_constraint (rect, constraint);
*
* constraint = clutter_bind_constraint_new (origin, CLUTTER_BIND_Y, 0.0);
* clutter_actor_meta_set_name (CLUTTER_ACTOR_META (constraint), "bind-y");
* clutter_actor_add_constraint (rect, constraint);
*
* clutter_actor_set_reactive (rect, TRUE);
* clutter_actor_set_opacity (rect, 0);
*
* g_signal_connect (rect, "button-press-event",
* G_CALLBACK (on_button_press),
* NULL);
* </programlisting>
* <para>On button press, the rectangle "slides" from behind the actor to
* which is bound to, using the #ClutterBindConstraint:offset property and
* the #ClutterActor:opacity property.</para>
* <programlisting>
* float new_offset = clutter_actor_get_width (origin) + h_padding;
*
* clutter_actor_animate (rect, CLUTTER_EASE_OUT_CUBIC, 500,
* "opacity", 255,
* "@constraints.bind-x.offset", new_offset,
* NULL);
* </programlisting>
* </example>
* </refsect2>
*/ */
/** /**