CHANGEABLE STATE MODEL OF USER INTERFACE AND ITS IMPLEMENTATION

OPE is a good user interface model，which combines Pop-Up State Transition Network model with Event Handler model using object-oriented technology．With OPE model，it becomes easy and normal to develop user interface．After simply introducing OPE model，this paper presents a new concept： changeable state in order to solve the problem that too many States，Actions and Rules are needed when user describes global hierarchical menu using OPE model．This concept has been applied into Fastool on PC，which make it easier to describe user interface．The description model and inner control model of changeable state is also presented completely in this paper．