Delegate.h

/*
 * Copyright (C) 2005-2013 by Dr. Marc Boris Duerner
 * 
 * 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.
 * 
 * As a special exception, you may use this file as part of a free
 * software library without restriction. Specifically, if other files
 * instantiate templates or use macros or inline functions from this
 * file, or you compile this file and link it with other files to
 * produce an executable, this file does not by itself cause the
 * resulting executable to be covered by the GNU General Public
 * License. This exception does not however invalidate any other
 * reasons why the executable file might be covered by the GNU Library
 * General Public License.
 * 
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef Pt_Delegate_h
#define Pt_Delegate_h

#include <Pt/Void.h>
#include <Pt/Slot.h>
#include <Pt/Function.h>
#include <Pt/Method.h>
#include <Pt/ConstMethod.h>
#include <Pt/Connectable.h>
#include <stdexcept>

namespace Pt {

class DelegateBase : public Connectable
{
    public:
        DelegateBase()
        { }

        DelegateBase(const DelegateBase& rhs)
        { DelegateBase::operator=(rhs); }

        DelegateBase& operator=(const DelegateBase& other)
        {
            _target.close();

            if( other._target.isValid() )
            {
                const Slot* slot = other._target.slot();
                _target = Connection( *this, slot->clone()  );
            }
                
            return *this;
        }

        bool isConnected() const
        {
            return _target.isValid();
        }

        virtual void onConnectionOpen(const Connection& c)
        {
            const Connectable* sender = c.sender();

            if( sender == this )
            {
                _target.close();
                _target = c;
            }

            Connectable::onConnectionOpen(c);
        }

        virtual void onConnectionClose(const Connection& c)
        {
            Connectable::onConnectionClose(c);
        }

    protected:
        void disconnectSlot()
        {
            _target.close();
        }

        void disconnectSlot(const Slot& slot)
        {
            if( _target.isValid() && _target.slot()->equals(slot) )
            {
                _target.close();
            }
        }

    protected:
        Connection _target;
};

#include <Pt/Delegate.tpp>

} // namespace Pt

#endif