// Copyright (C) 2008  Lukas Lalinsky
//
// This program is free software; 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.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

#ifndef DATABASERELATION_H
#define DATABASERELATION_H

#include <QGraphicsItem>
#include <QPainter>
#include "databasemodelitem.h"

class DatabaseTable;

class DatabaseRelation : public DatabaseModelItem
{
public:
	DatabaseRelation(QGraphicsItem *parent = 0);
	
	QRectF boundingRect() const;
	QPainterPath shape() const;
	void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);

	DatabaseTable *source() { return m_source; }
	void setSource(DatabaseTable *source);

	DatabaseTable *target() { return m_target; }
	void setTarget(DatabaseTable *target);

	enum { Type = DatabaseModelItem::Relation };
	virtual int type() const { return Type; }

	void updatePositions();

protected slots:
	void updateLayout();

protected:
	QVariant itemChange(GraphicsItemChange change, const QVariant &value);

private:
	DatabaseTable *m_source;
	DatabaseTable *m_target;
	
	QLineF m_line;
	QPolygonF m_arrowHead;
};

#endif