itk::EventObject Class Reference

#include <itkEventObject.h>

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

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

A set of standard EventObjects is defined near the end of itkEventObject.h.

See also

itk::Command

itk::ExceptionObject

Definition at line 58 of file itkEventObject.h.

Public Member Functions
virtual bool	CheckEvent (const EventObject *) const =0
	EventObject ()=default
	EventObject (const EventObject &)=default
virtual const char *	GetEventName () const =0
virtual EventObject *	MakeObject () const =0
EventObject &	operator= (const EventObject &)=delete
virtual void	Print (std::ostream &os) const
virtual	~EventObject ()=default

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

Constructor & Destructor Documentation

EventObject() [1/2]

itk::EventObject::EventObject ( )

default

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

EventObject() [2/2]

itk::EventObject::EventObject ( const EventObject &  )

default

~EventObject()

virtual itk::EventObject::~EventObject ( )

virtualdefault

Virtual destructor needed

Member Function Documentation

CheckEvent()

virtual bool itk::EventObject::CheckEvent ( const EventObject *  ) const

pure virtual

Check if given event matches or derives from this event.

GetEventName()

virtual const char * itk::EventObject::GetEventName ( ) const

pure virtual

Return the StringName associated with the event.

MakeObject()

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.

operator=()

EventObject & itk::EventObject::operator= ( const EventObject &  )

delete

Print()

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.

PrintHeader()

virtual void itk::EventObject::PrintHeader ( std::ostream &  os, Indent  indent  ) const

protectedvirtual

PrintSelf()

virtual void itk::EventObject::PrintSelf ( std::ostream &  os, Indent  indent  ) const

protectedvirtual

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.

PrintTrailer()

virtual void itk::EventObject::PrintTrailer ( std::ostream &  os, Indent  indent  ) const

protectedvirtual

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The documentation for this class was generated from the following file:

• itkEventObject.h