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6.5.1 Switchable layouts

A switchable layout allows you to place CAPI objects on top of one another and determine which object is displayed on top through Lisp code, possibly linked to a button or menu option through a callback. Switchable layouts are set up using a switchable-layout element in a make-instance . As with the other layouts, such as column-layout and row-layout , the elements to be organized are given as a list to the :description keyword. Here is an example:

(setq switching-panes (make-instance 
                       'switchable-layout
                       :description (list red-pane green-pane)))
(contain switching-panes)

Note that the default pane to be displayed is the red pane, which was the first pane in the description list. The two panes can now be switched between using switchable-layout-visible-child :

(apply-in-pane-process
 switching-panes #'(setf switchable-layout-visible-child)
 green-pane switching-panes)
 
(apply-in-pane-process
 switching-panes #'(setf switchable-layout-visible-child)
 red-pane switching-panes)

LispWorks CAPI User Guide (Macintosh version) - 17 Mar 2008

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