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Important: The information in this document is obsolete and should not be used for new development.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 / Low-Level Routines

CalcVisBehind
The Window Manager uses the CalcVisBehind procedure to calculate the visible regions of a series of windows.
PROCEDURE CalcVisBehind (startWindow: WindowPeek;
                           clobberedRgn: RgnHandle);
startWindow
A pointer to a window's window record.
clobberedRgn
A handle to the desktop region that has become invalid.

DESCRIPTION
The CalcVisBehind procedure calculates the visible regions of the window specified by the startWindow parameter and all windows behind startWindow that intersect clobberedRgn. It is called after PaintBehind.