public void setSortEnabled(boolean enabled) {
        mSortEnabled = enabled;
    }
Enable/Disable list item sorting. Disabling is useful if only item
removal is desired. Prevents drags in the vertical direction.

@param enabled Set <code>true</code> to enable list
item sorting.
third_party/DragSortListView/src/com/mobeta/android/dslv/DragSortController.java