protected boolean hideOffscreenPages() {
        return true;
    }
If the position offset of a fragment is less than negative one or greater than one, returning true will set the
visibility of the fragment to {@link View#GONE}. Returning false will force the fragment to {@link View#VISIBLE}.

@return
library/src/main/java/com/daimajia/slider/library/Transformers/BaseTransformer.java