kptrelation.h

/* This file is part of the KDE project
   Copyright (C) 2001 Thomas Zander zander@kde.org
   Copyright (C) 2004 Dag Andersen <danders@get2net.dk>
 
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 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
   Library General Public License for more details.
 
   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
*/
 
#ifndef KPTRELATION_H
#define KPTRELATION_H
 
#include "kptduration.h"
 
#include <tqstring.h>
 
class TQCanvas;
class TQDomElement;
 
namespace KPlato
{
 
class Node;
class Project;
class PertCanvas;

class Relation {
public:
    enum Type { FinishStart, FinishFinish, StartStart };
 
    Relation(Node *parent, Node *child, Type type, Duration lag);
    Relation(Node *parent=0, Node *child=0, Type type=FinishStart);
    Relation(Relation *rel);
    
    virtual ~Relation();
 
    void setType(Type );
    Type type() const { return m_type; }

    const Duration &lag() const { return m_lag; }
    void setLag(Duration lag) { m_lag = lag; }

    Node *parent() const { return m_parent; }
    Node *child() const { return m_child; }
 
    enum Result {
        SUCCESS = 0l,
        HASCHILDREN = 1l,
        NOTIMPL = 2l
    };
 
    bool load(TQDomElement &element, Project &project);
    void save(TQDomElement &element) const;
    
protected: // variables
    Node *m_parent;
    Node *m_child;
    Type m_type;
    Duration m_lag;
 
private:
    TQString m_parentId;
    
#ifndef NDEBUG
public:
    void printDebug(TQCString indent);
#endif
 
};
 
class ProxyRelation : public Relation
{
public:
    ProxyRelation(Node *parent, Node *child, Relation::Type type, Duration lag) 
    : Relation(parent, child, type, lag) 
    {}
 
    ~ProxyRelation() { m_parent = 0; m_child = 0;}
};
 
}  //KPlato namespace
 
#endif