Legacy Document

Important: The information in this document is obsolete and should not be used for new development.

Inside Macintosh: Macintosh Toolbox Essentials /

Chapter 4 - Window Manager / Window Manager Reference

Window Manager Routines / Maintaining the Update Region

ValidRgn
Use the ValidRgn procedure to remove a specified region from a window's
update region.
PROCEDURE ValidRgn (goodRgn: RgnHandle);
goodRgn
A region, in local coordinates, to be removed from a window's
update region.

DESCRIPTION
The ValidRgn procedure removes a specified region from 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.