center-window

Arguments: window &key on-parent return-only width height

Moves a window so that it is centered over the interior of its owner or parent. Returns a box that indicates the new exterior of the window.

window should be an instance of the basic-pane class or one of its subclasses.

If on-parent is true, then the window is centered over its parent, and otherwise it is centered over its owner. The default is nil. (The parent and owner of a window are different only when the window is a top-level owned window, in which case the parent is the screen and the owner is the owner window.)

If return-only is true, then the window is actually not moved at all, but the box to where it would have been moved is still returned. If nil (the default), then the window is moved and its new exterior box is returned.

width and height may each be nil (the default) to use the current width or height of the window, or else a positive integer to indicate a new width or height to which to resize the window while centering it.

See also the :centered argument to make-window and the centered property.

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