Difference between revisions of "DODEFAULT()"

Revision as of 16:54, 11 December 2009

Purpose

Function to call the parent class method from within a sub-class

Syntax

DODEFAULT()

See Also

ACLASS(), ADDPROPERTY(), AMEMBERS(), CLASS, COMPOBJ(), CREATEOBJECT(), DEFINE CLASS, METHOD, NEWOBJECT(), REMOVEPROPERTY(), SET CLASSLIBRARY, WITH

Description

The DODEFAULT() function is used to call the parent class method from within a sub-class. It can only be used within a class method. It calls the parent class method of the same name as the calling method. It allows a sub-class to perform the default parent class behavior along with additional behavior specific to that particular sub-class.

Example

class Box 
  procedure Draw 
    messagebox("This is the parent Draw Method") 
  endproc && Draw 
endclass 
 
class Dialog1 of Box 
  procedure Draw 
    messagebox("This is the object Draw Method")
    // call the Draw method of the Box parent class
    dodefault() 
  endproc && Draw 
endclass 
 
oDIALOGOK = createobject("Dialog1")
oDIALOGOK.Draw()
release oDIALOGOK

Products

Recital Server, Recital