An output record is a kind of display list--a collection of instructions for drawing something on the screen.
Some output records have children--a collection of inferior output records.
Displayed output records correspond directly to displayed information on the stream, and don't have children--they are leaf nodes of the tree. Displayed output records can be replayed.
Presentations are a special case of output records that remember the object and type of object associated with the output.
standard-tree-output-record is a class provided by CLIM
to store longer sequences of output records. It is optimized to store
output records that tend to be created one after another with
ascending y coordinates, such as you would find in a scrolling window
of text. The insertion and retrieval complexity of this class is
roughly O(log n), but can break down to be O(n).
(define-application-frame test () () (:panes (display :application :output-record (make-instance 'standard-tree-output-record)) (:layouts (:default display))))
Next: Menus and Dialogs