uclass.hpp

/************************************************************************
 *
 *  uclass.hpp: Ubit MetaClasses
 *  Ubit GUI Toolkit - Version 6
 *  (C) 2009 | Eric Lecolinet | TELECOM ParisTech | http://www.enst.fr/~elc/ubit
 *
 * ***********************************************************************
 * COPYRIGHT NOTICE :
 * THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY AND WITHOUT EVEN THE
 * IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
 * YOU CAN REDISTRIBUTE IT AND/OR MODIFY IT UNDER THE TERMS OF THE GNU
 * GENERAL PUBLIC LICENSE AS PUBLISHED BY THE FREE SOFTWARE FOUNDATION;
 * EITHER VERSION 2 OF THE LICENSE, OR (AT YOUR OPTION) ANY LATER VERSION.
 * SEE FILES 'COPYRIGHT' AND 'COPYING' FOR MORE DETAILS.
 * ***********************************************************************/

#ifndef _uclass_hpp_
#define _uclass_hpp_ 1
#include <ubit/udefs.hpp>
namespace ubit {
  
  
#define UCLASSDEF(NAME,C,CREATOR) \
struct MetaClass : public UClass { \
MetaClass(): UClass(NAME) {} \
virtual bool isInstance(UObject& obj) const {return dynamic_cast<C*>(&obj);} \
virtual bool isInstance(UObject* obj) const {return dynamic_cast<C*>(obj);} \
virtual C* newInstance() const {return CREATOR;} \
virtual UStyle* newStyle() const {return C::createStyle();} \
}; \
static  const UClass& Class() {static MetaClass& c = *new MetaClass; return c;} \
virtual const UClass& getClass() const {return Class();}

  
#define UCLASS(C) UCLASSDEF(#C, C, new C)
  
#define UABSTRACT_CLASS(C) UCLASSDEF(#C, C, null)
    
  
  class UClass {  
  public:
    enum ParseModes {
      EMPTY_ELEMENT      = 1<<0, 
      DONT_PARSE_CONTENT = 1<<1,
      PRESERVE_SPACES    = 1<<2
    };
        
    UClass(const char* name);
    UClass(const UStr& name);
    virtual ~UClass();
    
    const UStr& getName() const {return *name;}
    
    unsigned int getNo() const {return no;}
    virtual int getParseModes() const {return 0;}
    
    virtual bool isInstance(UObject& object) const {return false;}
    
    virtual UObject* newInstance() const {return null;}
    virtual UStyle* newStyle() const {return null;}
    UStyle* obtainStyle() const {return style ? style : (style = newStyle());}
    UAttrList* getAttributes() const {return attributes;}
    void setAttributes(UAttrList* alist) const {attributes = alist;}
  private:
    static unsigned int count;
    unsigned int no;
    UStr* name;
    mutable UStyle* style;
    mutable UAttrList* attributes;
    
    UClass(const UClass&);   // assignment is forbidden.
    UClass& operator=(const UClass&);
  };

}
#endif