Form Data Model: _vscroll

Form Data Model: _vscroll

Returns whether a vertical scroll should be allowed by the viewer

Syntax
Details

Syntax

CALL SEND (model-id, '_vscroll', amount, return-code);

Argument Type Description

amount
N specifies the number of rows to be scrolled:

values >0
indicate scrolling down

values<0
indicates scrolling up

return-code
N returns whether scrolling is allowed:

scrolling is allowed

scrolling should not be allowed

Argument	Type	Description
amount	N	specifies the number of rows to be scrolled:
		values >0	indicate scrolling down
		values<0	indicates scrolling up
return-code	N	returns whether scrolling is allowed:
		scrolling is allowed
		scrolling should not be allowed

Details

The viewer calls the _vscroll method when a vertical scroll is about to occur to make sure that scrolling should be allowed by the viewer. For example, the Data Set Data Model subclass checks the current row to see if there is anything to prevent you from leaving the row, such as a column in error.

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