screen

The class of screen objects. There is only a single screen instance, which is automatically created when Common Graphics is initialized with initialize-cg. (A possible future enhancement would support multiple monitors, each of which would have its own screen.)

The screen object is returned by the expression (screen *system*) (see screen and *system*). This object will be returned by parent when called on a top-level window, and by owner when called on a non-owned top-level window.

Drawing may be done on the screen as it is done on a window, though the drawing code must be wrapped in a with-device-context form. Care should be taken not to draw on other applications, which this allows.

This class was named windows-screen-device in releases prior to 7.0.

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This page was not revised from the 9.0 page.
Created 2015.5.21.