invalidate-component

Arguments: dialog-item &optional box erase-p

Tells the operating system to invalidate part or all of a component window, so that the operating system will tell the window to redraw itself after all other message processing has completed. If box is nil, then the entire window is invalidated; otherwise box should be a box in the component window's own coordinate system (0,0 refers to the interior top left of the component), and only that portion of the component window will be invalidated. If erase-p is true, then the operating system will be told to erase the invalidated region before it sends the message to the window to tell its event handler to redraw it.

The more general function invalidate is now recommended over most of the invalidate-* functions.

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This page was not revised from the 8.2 page.
Created 2012.5.30.