DrawNew

Erase or update a window

#include <Windows.h> Window Manager

void DrawNew( theWindow, updateFlag );

WindowPeek theWindow ; window of interest

Boolean updateFlag ; TRUE=do update, FALSE=just paint white

This low-level function is used by the Window Manager to determine what

portions of a window need to be updated. It must be preceded by a matching call

theWindow is the WindowPeek (pointer to a WindowRecord) of the window that

is to be updated.

updateFlag specifies whether to update the changed area or just erase it. It

must be one of:

FALSE Just erase the area; paint it white

TRUE Erase the area; then update it as needed

Notes: This first determines which portions of a window have changed by

performing the following calculation:

(OldStruc XOR NewStruc ) UNION (OldContent XOR NewContent )

Where OldStruc and OldContent are regions saved by SaveOld and

NewStruc and NewContent are regions of theWindow .

If updateFlag = TRUE, this resulting region is stored into the update region

of theWindow (so that an update event will be generated eventually). If

updateFlag = FALSE, the resulting region is painted white.

Referenced by (3):