GVU Technical Report Number:
GIT-GVU-91-09
Title:
Controlling User Interface Objects through Pre- and Postconditions
Authors:
Daniel F. Gieskens
James D. Foley
Abstract:
We have augmented user interface objects (i.e. windows, menus, buttons,
sliders, etc.) with preconditions that determine their visibility and
their enabled/disabled status and postconditions that are asserted when
certain actions are performed on the object. Postconditions are
associated with each functionally different action on the object.
Attaching pre- and postconditions to interface objects provides several
useful features, such as selective enabling of controls, rapid
prototyping, and automatic generation of explanations and help text.
Keywords:
User interface tools, prototyping, predicates
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