VkModel(3x)

NAME
     VkModel - An abstract class that supports Model-View-Controller style
     applications

INHERITS FROM
     VkCallbackObject

HEADER FILE
     #include <Vk/VkModel.h>

PUBLIC PROTOCOL SUMMARY
   Destructor
           virtual void ~VkModel(void);


PROTECTED PROTOCOL SUMMARY
   Constructor
           VkModel(void);

   Notifying Views of Changes
           void updateViews(void *data);


CLASS DESCRIPTION
     The VkModel class is a very simple abstract class that supports
     applications that want to use the Model-View-Controller (MVC)
     architecture. The VkModel class is intended to be subclassed, and the
     subclass provides the data members and any additional functions required
     to implement the model. ViewKit components can be used as both "views"
     and "controllers". View components can arrange to be notified of changes
     to the model by registering a member function with the
     VkModel::updateCallback list. Callbacks on this list are invoked when a
     subclass of VkModel calls updateViews(). This method is just a convenient
     way to invoke the functions on the updateCallback list. Components used
     as "controllers" are expected to send messages to subclasses of VkModel
     to alter the state of the model. This protocol must be worked out between
     the VkModel subclass and the controller components.

FUNCTION DESCRIPTIONS
   updateViews()
           void updateViews(void * data);


          Calls all member functions on the updateCallback list, passing the
          provided data as the callData.

   VkModel()
           VkModel(void);
          Initialize a VkModel class.

   ~VkModel()
           virtual void ~VkModel(void);


          Empty function.

DATA MEMBER DESCRIPTIONS
   updateCallback
           static const const char* updateCallback;


          Other classes that wish to be notified when the internal state of a
          VkModel subclass has changed should register a member function with
          this callback list.

INHERITED MEMBER FUNCTIONS
   Inherited from VkCallbackObject
          callCallbacks(), addCallback(),  removeCallback(),
          removeAllCallbacks()


SEE ALSO
     VkCallbackObject
     ViewKit Programmer's Guide
     The X Window System, DEC Press, Bob Sheifler and Jim Gettys
     The X Window System Toolkit, DEC Press, Paul Asente and Ralph Swick
     The OSF/Motif Programmers Reference, Prentice Hall, OSF