private void adjustItem(int position) {
        View v = getChildAt(position - getFirstVisiblePosition());

        if (v != null) {
            adjustItem(position, v, false);
        }
    }
Set the width of each drag scroll region by specifying
a fraction of the ListView height.

@param upperFrac Fraction of ListView height for up-scroll bound.
Capped at 0.5f.
@param lowerFrac Fraction of ListView height for down-scroll bound.
Capped at 0.5f.
third_party/DragSortListView/src/com/mobeta/android/dslv/DragSortListView.java