Legacy Document

Inside Macintosh: More Macintosh Toolbox /

Chapter 4 - List Manager / List Manager Reference

List Manager Routines / Modifying a List's Appearance

LScroll

You can use the LScroll procedure to scroll a list a specified number of rows and columns.

PROCEDURE LScroll (dCols: Integer; dRows: Integer; 
                   lHandle: ListHandle);

dCols

The number of columns to scroll. Specify a positive number to scroll down (that is, each cell moves up), and a negative number to scroll up.

dRows

The number of rows to scroll. Specify a positive number to scroll right (that is, each cell moves left), and a negative number to scroll left.

lHandle

The list to be scrolled.

DESCRIPTION

The LScroll procedure scrolls the list specified by the lHandle procedure the number of columns and rows specified by dCols and dRows. The List Manager will not scroll beyond the data bounds of the list.

If the automatic drawing mode is enabled, LScroll does all necessary updating of the list.

SPECIAL CONSIDERATIONS

You should not call the LScroll procedure from within an interrupt, such as in a completion routine or VBL task.

ASSEMBLY-LANGUAGE INFORMATION

The trap macro and routine selector for the LScroll procedure are

Trap macro	Selector
_Pack0	$0050