Abstract class for all Tweeners used by [SceneTreeTween].
</brief_description>
<description>
Tweeners are objects that perform a specific animating task, e.g. interpolating a property or calling a method at a given time. A [Tweener] can't be created manually, you need to use a dedicated method from [SceneTreeTween].
</description>
<tutorials>
</tutorials>
<methods>
</methods>
<signals>
<signalname="finished">
<description>
Emitted when the [Tweener] has just finished its job.