|StateVarView(3U)||InterViews Reference Manual||StateVarView(3U)|
NAME¶StateVarView - state variable view base class
DESCRIPTION¶StateVarView is the base class for state variable views. State variable views provide a graphical interface to examining and potentially modifying a state variable subject. The StateVarView base class is an abstract class derived from MonoScene. Like MonoScene, the StateVarView class is not instantiated; instead, subclasses add state and behavior appropriate for displaying and editing their subject. Like other MonoScene subclasses, StateVarView subclasses use an interactor composition to define their appearance.
- virtual void Update()
- Update the state variable view in response to a change in state it depends on (typically the subject's). This operation does not normally need redefinition if Init and Stale (described below) are redefined.
- Subclass constructors normally take an instance of the corresponding subject as an argument. The base class constructor automatically attaches the view to the subject.
- virtual void Init()
- Initialize the view based on information in the subject. Subclasses redefine this operation according to their semantics; it does nothing by default.
- virtual boolean Stale()
- Return whether the view is in any way inconsistent with its subject. This operation always returns true by default; subclasses can redefine it to make a more discerning decision.
SEE ALSO¶MonoScene(3I), StateVar(3U)
|6 August 1990||Unidraw|