code: public boolean expandPanel(float mSlideOffset) {
          if (mSlideableView == null || mSlideState == SlideState.EXPANDED) return false;
          mSlideableView.setVisibility(View.VISIBLE);
          return expandPanel(mSlideableView, 0, mSlideOffset);
      }
docs: Partially expand the sliding panel up to a specific offset
  
  @param mSlideOffset Value between 0 and 1, where 0 is completely expanded.
  @return true if the pane was slideable and is now expanded/in the process of expanding