FXDelegator.h

/********************************************************************************
*                                                                               *
*                       D e l e g a t o r   T a r g e t                         *
*                                                                               *
*********************************************************************************
* Copyright (C) 2000,2004 by Jeroen van der Zijp.   All Rights Reserved.        *
*********************************************************************************
* This library is free software; you can redistribute it and/or                 *
* modify it under the terms of the GNU Lesser General Public                    *
* License as published by the Free Software Foundation; either                  *
* version 2.1 of the License, or (at your option) any later version.            *
*                                                                               *
* This library is distributed in the hope that it will be useful,               *
* but WITHOUT ANY WARRANTY; without even the implied warranty of                *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU             *
* Lesser General Public License for more details.                               *
*                                                                               *
* You should have received a copy of the GNU Lesser General Public              *
* License along with this library; if not, write to the Free Software           *
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.    *
*********************************************************************************
* $Id: FXDelegator.h,v 1.13 2004/04/05 14:49:33 fox Exp $                       *
********************************************************************************/
#ifndef FXDELEGATOR_H
#define FXDELEGATOR_H

#ifndef FXOBJECT_H
#include "FXObject.h"
#endif

namespace FX {


/**
* A delegator forwards messages to a delegate object.
* Delegators are used when you need to multiplex messages
* toward any number of target objects.
* For example, many controls may be connected to FXDelegator,
* instead of directly to the document object.  Changing the
* delegate in FXDelegator will then reconnect the controls with their
* new target.
*/
class FXAPI FXDelegator : public FXObject {
  FXDECLARE(FXDelegator)
protected:
  FXObject   *delegate;
private:
  FXDelegator(const FXDelegator&);
  FXDelegator &operator=(const FXDelegator&);
public:
  virtual long onDefault(FXObject*,FXSelector,void*);
public:

  /// Construct a delegator
  FXDelegator(FXObject* target=NULL):delegate(target){ }

  /// Return delegate object
  FXObject* getDelegate() const { return delegate; }

  /// Change delegate object
  void setDelegate(FXObject* target){ delegate=target; }

  /// Always trash during detroy
  virtual ~FXDelegator(){ delegate=(FXObject*)-1L; }
  };

}

#endif

Copyright © 1997-2004 Jeroen van der Zijp