Stack animation is not working properly about jazzyviewpager HOT 2 OPEN

 @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    protected void animateStack(View left, View right, float positionOffset, int positionOffsetPixels) {


        if (mState == State.IDLE) {
            return;
        }


        if (mState == State.GOING_RIGHT) {


            if (right != null) {

                manageLayer(right, true);
                mScale = (1 - SCALE_MAX) * positionOffset + SCALE_MAX;
                mTrans = -getWidth() - getPageMargin() + positionOffsetPixels;
                ViewHelper.setScaleX(right, mScale);
                ViewHelper.setScaleY(right, mScale);
                ViewHelper.setTranslationX(right, mTrans);

                if (API_21) {
                    right.setZ(mScale);
                }
            }

            if (left != null) {

                left.bringToFront();

                if (API_21) {
                    left.setZ(1);
                }
            }
        } else if (mState == State.GOING_LEFT) {

            if (left != null) {

                mScale = (1 - SCALE_MAX) * (1 - positionOffset) + SCALE_MAX;
                mTrans = positionOffsetPixels;
                ViewHelper.setScaleX(left, mScale);
                ViewHelper.setScaleY(left, mScale);
                ViewHelper.setTranslationX(left, mTrans);

                if (API_21) {
                    left.setZ(mScale);
                }
            }


            if (right != null) {
                manageLayer(right, true);
                if (API_21) {
                    right.setZ(1);
                }

                right.bringToFront();
            }
        }
    }