Inside Macintosh: Macintosh Toolbox Essentials /

Chapter 4 - Window Manager / Window Manager Reference

Window Manager Routines / Maintaining the Update Region

InvalRgn

Use the InvalRgn procedure to add a region to a window's update region.

PROCEDURE InvalRgn (badRgn: RgnHandle);

badRgn

The region, in local coordinates, that is to be added to a window's
update region.

DESCRIPTION

The InvalRgn procedure adds a specified region to the update region of the window whose graphics port is the current port. Specify the region in local coordinates. The Window Manager clips it, if necessary, to fit in the window's content region.

SEE ALSO

See Listing 4-13 on page 4-58 for an example that uses InvalRgn to add part of the window's content region to the update region.