DI - An object-oriented user interface toolbox for modula-2 applications

The DI dialog interface tool library for Modula-2 applications described in this paper facilitates the design and implementation of graphical, object-oriented user interfaces for workstations with a graphical screen, a mouse and a keyboard. Much emphasis is put on the portability of the application program. This is achieved, in part, by a clean separation of application from the user interface and by basing the tools on only a few low level, window system dependent operations. The software described here also includes an interactive editor for graphical layout of user interfaces.