default-top-left

Arguments: window window-width window-height

This generic function is called when a window is created if none of the initargs to make-window (specifically :left and :top, :exterior-top-left, :exterior, or :interior) specifies a position for the window. Returns a default position at which to place the exterior upper-left corner of the new window. An application may add default-top-left methods to specify the default positioning for various window classes.

If the offset-from-selected-window configuration property is turned on (as it is by default), then the default default-top-left method will position the window just down and right (by the height of a titlebar) from the selected child window of the new window's parent window if any. Otherwise it places the window at the most recently used default position, which is initially the upper left of the screen.

A special wrapper method in the IDE defaults any windows that are owned by the invisible IDE owner window (the development-main-window) to a special location selected by the IDE, which is the position where new forms are placed. (When running the IDE, a window will in fact be owned by the IDE owner window if no :parent initarg is passed to make-window; in a standalone application a new window will be an ordinary top-level window by default.)

This generic function is similar to default-width and default-height, but differs in that those are also configuration properties while default-top-left is not a configuration property.

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This page was not revised from the 10.0 page.
Created 2019.8.20.