PATHMac OS 8 and 9 Developer Documentation > Human Interface Toolbox > Window Manager >

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.