- * @return <code>true</code> if underlying view shall be re-rendered. If at
- * least one of the view update listeners returns <code>true</code>,
- * view is re-rendered.
+ * Notifies that it is about time to render next frame. Update listener can determine if frame repaint is actually
+ * needed from its perspective. Frame will be rendered if at least one listener says yes.
+ *
+ * @return <code>true</code> if underlying view shall be re-rendered. If at least one of the view update listeners
+ * returns <code>true</code>, view is re-rendered.