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itk::EventObject Class Reference
[ITK System Objects]

Abstraction of the Events used to communicating among filters and with GUIs. More...

#include <itkEventObject.h>

List of all members.

Public Methods

 EventObject ()
virtual ~EventObject ()
virtual EventObject * MakeObject () const=0
virtual void Print (std::ostream &os) const
virtual const char * GetEventName (void) const=0
virtual bool CheckEvent (const EventObject *) const=0

Protected Methods

virtual void PrintSelf (std::ostream &os, Indent indent) const
virtual void PrintHeader (std::ostream &os, Indent indent) const
virtual void PrintTrailer (std::ostream &os, Indent indent) const


Detailed Description

Abstraction of the Events used to communicating among filters and with GUIs.

EventObject provides a standard coding for sending and receiving messages indicating things like the initiation of processes, end of processes, modification of filters.

EventObjects form a hierarchy similar to the itk::ExceptionObject allowing to factorize common events in a tree-like structure. Higher detail can be assigned by users by subclassing existing itk::EventObjects.

EventObjects are used by itk::Command and itk::Object for implementing the Observer/Subject design pattern. Observers register their interest in particular kinds of events produced by a specific itk::Object. This mechanism decouples classes among them.

As oppossed to itk::Exception, itk::EventObject does not represent error states, but simply flow of information allowing to trigger actions as a consecuence of changes occurring in state on some itk::Objects.

itk::EventObject carries information in its own type, it relies on the appropiate use of the RTTI (Run Time Type Information).

See also:
itk::Command , itk::ExceptionObject

Definition at line 56 of file itkEventObject.h.


Constructor & Destructor Documentation

itk::EventObject::EventObject   [inline]
 

Constructor and copy constructor. Note that these functions will be called when children are instantiated.

Definition at line 61 of file itkEventObject.h.

virtual itk::EventObject::~EventObject   [inline, virtual]
 

Virtual destructor needed

Definition at line 64 of file itkEventObject.h.


Member Function Documentation

virtual bool itk::EventObject::CheckEvent const EventObject *    const [pure virtual]
 

Check if given event matches or derives from this event.

virtual const char* itk::EventObject::GetEventName void    const [pure virtual]
 

Return the StringName associated with the event.

virtual EventObject* itk::EventObject::MakeObject   const [pure virtual]
 

Create an Event of this type This method work as a Factory for creating events of each particular type.

virtual void itk::EventObject::Print std::ostream &    os const [virtual]
 

Print Event information. This method can be overridden by specific Event subtypes. The default is to print out the type of the event.

virtual void itk::EventObject::PrintHeader std::ostream &    os,
Indent    indent
const [protected, virtual]
 

Methods invoked by Print() to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

virtual void itk::EventObject::PrintSelf std::ostream &    os,
Indent    indent
const [protected, virtual]
 

Methods invoked by Print() to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

virtual void itk::EventObject::PrintTrailer std::ostream &    os,
Indent    indent
const [protected, virtual]
 

Methods invoked by Print() to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.


The documentation for this class was generated from the following file:
Generated at Wed Mar 12 01:15:54 2003 for ITK by doxygen 1.2.15 written by Dimitri van Heesch, © 1997-2000