Abstract

The incorporation of continuous media like audio and video in multimedia user interfaces poses new requirements on user interface development tools especially the simultaneous execution of continuous output operations and user interactions. Therefore, we have developed an object-oriented dialog control model which facilitates the recognition and processing of user defined interactions by object hierarchies. Furthermore, the model incorporates object classes for the definition and synchronization of complex multimedia actions represented as directed acyclic graphs. Concurrency between interactions and continuous output actions can be modelled by synchronization operators. The presented dialog control model supports the development of common graphical user interfaces as well as multimedia user interfaces releasing the dialog developer from programming difficult synchronization operations by offering abstract operators. It builds the basis of an object-oriented User Interface Toolkit (UIT) which has been implemented and will be applied to an interactive development environment for multimedia presentation applications.

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