SoXtObject Class Reference

The SoXtObject class is the common superclass for all SoXt component classes. More...

#include <Inventor/Xt/SoXtObject.h>

Inheritance diagram for SoXtObject:

Public Member Functions
virtual SoType	getTypeId (void) const =0
SbBool	isOfType (SoType type) const

Static Public Member Functions
static void	initClass (void)
static SoType	getClassTypeId (void)
static void	init (void)

Detailed Description

The SoXtObject class is the common superclass for all SoXt component classes.

The purpose of making this class the superclass of all SoXt device, component and viewer classes is to be able to do run-time type checking of the SoXt objects.

You can place the macro SOXT_OBJECT_HEADER(classname,parentname) within a class definition header for SoXt extension components to automatically make the necessary definitions for setting up a run-time type system for your extension classes:

#ifndef MYSPECIALVIEWER_H
#define MYSPECIALVIEWER_H

class MySpecialViewer : public SoXtExaminerViewer {
  SOXT_OBJECT_HEADER(MySpecialViewer, SoXtExaminerViewer);
  // [rest of class definition follows]
};

#endif // !MYSPECIALVIEWER_H

Then put the SOXT_OBJECT_SOURCE(classname) macro within the actual implementation sourcecode file to include the necessary code for the run-time type system:

#include <MySpecialViewer.h>

SOQT_OBJECT_SOURCE(MySpecialViewer);

// [rest of class implementation]

See also the documentation of the SoType class in Coin or Inventor.

Member Function Documentation

initClass()

void SoXtObject::initClass ( void  )

static

Sets up initialization for data common to all instances of this class, submitting necessary information to the internal SoXt type system.

getClassTypeId()

SoType SoXtObject::getClassTypeId ( void  )

static

This static method returns the SoType object associated with objects of this class.

getTypeId()

SoType SoXtObject::getTypeId ( void  ) const

pure virtual

Returns the type identification of an object derived from a class inheriting SoXtObject. This is used for run-time type checking and "downward" casting.

Usage example:

void foo(SoXtViewer * comp)
{
  if (comp->getTypeId() == SoXtExaminerViewer::getClassTypeId()) {
    // safe downward cast, knows the type
    SoXtExaminerViewer * exviewer = (SoXtExaminerViewer *)comp;
  }
  else if (comp->getTypeId().isOfType(SoXtFlyViewer::getClassTypeId())) {
    // safe downward cast, knows the type
    SoXtFlyViewer * flyviewer = (SoXtFlyViewer *)comp;
    // then something else
  }
}

isOfType()

SbBool SoXtObject::isOfType

(

SoType

type

)

const

Returns TRUE if the type of this object is either of the same type or inherited from type.

init()

void SoXtObject::init ( void  )

static

Initialize the type system of SoXtObject, all SoXt device classes and all SoXt components (including viewers).

---

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

• SoXtObject.h
• SoXtObject.cpp