RemoveFromSCC

Clear

This simplest of the Clear commands erases a window or clears the main screen.

Usage

CLEAR

When you apply CLEAR to a form, the controls disappear but they're not destroyed. The form's Refresh method brings some of them back. Giving the form focus brings back some more. Clicking somewhere on the form brings back any controls at that location. Items drawn with the form's drawing methods don't come back (which is as it should be). In reality, CLEAR isn't really meant for forms. Use RemoveObject to get rid of controls and Cls to erase drawing objects.

If you use the Picture property of _SCREEN to create a backdrop for your application, like the background-tiled images on the Web, you may find that after a while, the top quarter or fifth of the screen stops clearing correctly and starts accumulating bitmap garbage. Force the screen to clear with:

LOCAL llLockScreen, lcPicture llLockScreen = _SCREEN.LockScreen _Screen.LockScreen = .T. lcPicture =_SCREEN.Picture _SCREEN.Picture="" _SCREEN.Picture =lcPicture _Screen.LockScreen = llLockScreen

Example

ACTIVATE SCREEN CLEAR

See Also

Cls, Refresh, RemoveObject

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Copyright © 2002 by Tamar E. Granor, Ted Roche, Doug Hennig, and Della Martin. All Rights Reserved.