Unit
WPRuler

Declaration

TWPRulerOptions = set of (
    wrShowTabSelector,
    wrShowTabStops,
    wrShowIndents,
    wpUseIntervalls,
    wpNoVertRulerAttached, // should be enabled when you use a vertical ruler
    wpRulerReadOnly, // Don't allow draging of indent merkers
    wpPageMarginsReadOnly // Do not change margins of the page
    );