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Programming With the Mac OS 8.5 Window Manager

Maintaining the Update Region

The Mac OS 8.5 Window Manager provides the following functions for updating windows:

InvalWindowRect adds a rectangle to a window's update region.
ValidWindowRect removes a rectangle from a window's update region.
InvalWindowRgn adds a region to a window's update region.
ValidWindowRgn removes a region from a window's update region.

© 1999 Apple Computer, Inc. – (Last Updated 18 March 99)

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