MWAPI - SCROLLBY

Draft MDC Standard

SCROLLBY specifies the amount by which the VALUE elattribute increases or decreases when the user presses a scroll gadget’s movement control. If the user presses a small movement control, the scroll gadget’s VALUE elattribute is increased or decreased by the amount specified by the scrollsmall component of the SCROLLBY value. If the user presses a large movement control, the scroll gadget’s VALUE elattribute is increased or decreased by the amount specified by the scrollbig component of the SCROLLBY value.

If an application attempts to assign a scrollby value that contains a negative value for scrollsmall or scrollbig, an error occurs with an ecode = "M47" and $EREF containing a value that indicates the ssvn reference for which the error occurred.

For scrollsmall, the default is 1 (one).

For scrollbig, the default is equal to the M[UMPS] numeric interpretation of

X-Y/5

Where X and Y are equal to, respectively, the scrollmax and scrollmin components of the value of the gadget’s SCROLLRANGE elattribute.