Apparatus and method for user indication of model state in a model view controller

Abstract

A model view controller has a model and a view with one or more listeners, and each listener may register with the model when the listener desires to be notified of a change of state in the model. In the preferred embodiment, when the model is about to change its state, it notifies all registered listeners, and after the model has changed its state, it notifies all registered listeners again. The present invention thus allows the model to notify the view when the state of the model changes, and the view can then decide what actions to perform, such as suitable indications to the user of the model state. The present invention thus achieves efficient user notification of the state of the model within the constraints of the model view controller paradigm.

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