Adapting Component-based User Interfaces at Runtime using Observers

Model-driven engineering (MDE) already plays a key role in Human-Computer Interaction for the automatic generation of end-user interfaces from their abstract and platform-independent specifications. Moreover, MDE techniques and tools are proving to be very useful for adapting at runtime the final user interfaces according to the current context properties: platform, user roles, component states, etc. In this paper we propose a mechanism to adapt user interfaces at runtime. These user interfaces will be (re)generated through the dynamic composition of user-interface software components, depending on the observed properties of the environment and of the components' behaviour.