InvalRect

Force an area of a window to be redrawn

#include <Windows.h> Window Manager

void InvalRect(badRect );

Rect *badRect ; rectangle needing update (in current window)

InvalRect causes the Window Manager to issue an update event, so that you

will redraw the selected rectangle.

badRect is a pointer to a rectangle. It defines an area, in local window

coordinates, that needs to be redrawn.

Notes: This adds the specified rectangle to the update region of the current

GrafPort, that must be assigned to a window. Using this call on a GrafPort

which is not a window is a fatal error.

This call is used in many situations. Use it after TextEdit functions that

change the font, justification, and other attributes by modifying the TERec

structure (i.e, functions that are not recognized automatically by the

window manager). Use it after calling SizeWindow and subsequently

redrawing the scroll bars, to ensure that the modified window gets redrawn.

Use it after scrolling text upward - to force the bottom of the window to be

included in the update area.

InvalRgn lets you specify a region for this same purpose.

Use ValidRect to remove a rectangle from the window's update region,

e.g., after drawing the scrollbars, they become valid, so there is no need to

update them again.

Referenced by (46):