SldDecPos Macro

#define SldDecPos(pSld) \
    SldSetPos                                                                                      \
    (                                                                                              \
        pSld,                                                                                      \
        (((LONG) ((SLIDER*)pSld)->pos - (LONG) ((SLIDER*)pSld)->page) >= 0) ?                      \
                        (((SLIDER*)pSld)->pos - ((SLIDER*)pSld)->page) : 0                         \
    )

This macro decrement the slider position by the delta change (page) value set. Object must be redrawn after this function is called to reflect the changes to the object.

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See SldIncPos() example.