ConnectionGraphicsItem.h

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/*
-----------------------------------------------------------------------------
This source file is part of FRAPPER
research.animationsinstitut.de
sourceforge.net/projects/frapper

Copyright (c) 2008-2009 Filmakademie Baden-Wuerttemberg, Institute of Animation 

This program 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; version 2.1 of the License.

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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
-----------------------------------------------------------------------------
*/


#ifndef CONNECTIONGRAPHICSITEM_H
#define CONNECTIONGRAPHICSITEM_H

#include "FrapperPrerequisites.h"
#include "Connection.h"
#include "NodeGraphicsItem.h"
#include <QtGui/QGraphicsLineItem>
#include <QtGui/QGraphicsSceneContextMenuEvent>
#include <QtGui/QWidget>
#include <QtGui/QPainter>
#include <QtGui/QMenu>

namespace Frapper {

class FRAPPER_CORE_EXPORT ConnectionGraphicsItem : public QObject, public QGraphicsLineItem
{

    Q_OBJECT

private: // static data

    static ConnectionGraphicsItem *s_tempItem;

public: // static functions

    static ConnectionGraphicsItem * getTempItem ();

    static void setTempItem ( ConnectionGraphicsItem *connection );

    static bool isConnectionCreated ();

public: // constructors and destructors

    ConnectionGraphicsItem ( const QString &name, const QColor &color, const QPointF &startPoint, const QPointF &endPoint );

    ~ConnectionGraphicsItem ();

public: // functions

    virtual QRectF boundingRect () const;

    virtual QPainterPath shape () const;

    void setEnabled ( bool enabled );

    virtual void paint ( QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0 );

    void updatePath ();

    Connection * getConnection () const;

    void setConnection ( Connection *connection );

    //QMap<QString, Connection *> getConnections ();

    //void addConnection ( Connection *connection );

    //void removeConnection ( const QString &name );

    NodeGraphicsItem * getStartNodeItem ();

    void setStartNodeItem ( NodeGraphicsItem *item );

    NodeGraphicsItem * getEndNodeItem() const;

    void setEndNodeItem ( NodeGraphicsItem *item );

    QPointF getStartPoint () const;

    void setStartPoint ( const QPointF &startPos );

    QPointF getEndPoint () const;

    void setEndPoint ( const QPointF &endPos );

    void updatePosition ( const QPointF &scenePosition );

    public slots: //

        //void contextClicked ( QAction *action );

signals: //

        void nodeGraphicsItemSelected ( const QString &name );

        void destroyed ( Connection *connection );

        void destroyed ( ConnectionGraphicsItem *connectionItem );

protected: // functions

    void hoverEnterEvent ( QGraphicsSceneHoverEvent *event );

    void hoverLeaveEvent ( QGraphicsSceneHoverEvent *event );

    //QVariant itemChange ( GraphicsItemChange change, const QVariant &value );

private: // functions

    void setTemp ( bool temp );

    //void contextMenuEvent ( QGraphicsSceneContextMenuEvent *event );

private: // data

    QString m_name;

    QColor m_color;

    QPainterPath m_mainPath;

    QPainterPath m_shadowPath;

    QPolygonF m_arrowHeadPolygon;

    QPainterPath m_shapePath;

    QPointF m_startPoint;

    QPointF m_endPoint;

    bool m_selfInitiated;

    Connection *m_connection;

    QMap<QString, Connection *> m_connections;

    NodeGraphicsItem *m_startNodeItem;

    NodeGraphicsItem *m_endNodeItem;

    //QMenu m_contextMenu;

    bool m_temp;

    bool m_hovered;

};

} // end namespace Frapper

#endif