VkModel(3x)							   VkModel(3x)

NAME    [Toc]    [Back]

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

INHERITS FROM    [Toc]    [Back]

     VkCallbackObject

HEADER FILE    [Toc]    [Back]

     #include <Vk/VkModel.h>

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

PROTECTED PROTOCOL SUMMARY    [Toc]    [Back]

   Constructor
	   VkModel(void);

   Notifying Views of Changes    [Toc]    [Back]
	   void	updateViews(void *data);

CLASS DESCRIPTION    [Toc]    [Back]

     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    [Toc]    [Back]

   updateViews()
	   void	updateViews(void * data);


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

   VkModel()    [Toc]    [Back]
	   VkModel(void);







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VkModel(3x)							   VkModel(3x)



	  Initialize a VkModel class.

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


	  Empty	function.

DATA MEMBER DESCRIPTIONS    [Toc]    [Back]

   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    [Toc]    [Back]

   Inherited from VkCallbackObject
	  callCallbacks(), addCallback(),  removeCallback(),
	  removeAllCallbacks()

SEE ALSO    [Toc]    [Back]

     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


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