7.4 A tour of sheets

Each unique piece of a window is a sheet. Thus, a sheet creates a visible element of some sort on the screen. In any frame, sheets are nested in a parent-child hierarchy. The DUIM-Sheets library provides DUIM with many different types of sheet, and defines the behavior of sheets in any application.

For basic DUIM applications, you do not need to be aware of sheet protocols, and you do not need to define your own sheet classes, since most of the sheet classes you need to use have been implemented for you in the form of gadgets (Section 7.2) and layouts (Section 7.3).

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Building Applications Using DUIM - 26 May 1999