ATTR_SB_VALUE

Data Type: integer
Description: The current position of the thumb in the scroll bar. The attribute value must be between ATTR_SB_DOC_MIN and ATTR_SB_DOC_MAX. When the scroll bar thumb is at the top (left), the value is equal to ATTR_SB_DOC_MIN. When the scroll bar thumb is at the bottom (right), the value is equal to ATTR_SB_DOC_MAX.