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#ifndef ARROW_H
#define ARROW_H

#include <QGraphicsLineItem>
#include <QtXml>
#include "diagramtextitem.h"
#include "lineitem.h"
#include "diagramitem.h"

QT_BEGIN_NAMESPACE
class QGraphicsPolygonItem;
class QGraphicsLineItem;
class QGraphicsPathItem;
class QGraphicsScene;
class QRectF;
class QGraphicsSceneMouseEvent;
class QPainterPath;
QT_END_NAMESPACE

class lineItem;

class Arrow : public QGraphicsPathItem
{
public:
    enum { Type = UserType + 32 };

    Arrow(DiagramTextItem *startItem, DiagramTextItem *endItem,
      QGraphicsItem *parent = 0, QGraphicsScene *scene = 0);

    int type() const
        { return Type; }
    QRectF boundingRect() const;
    QPainterPath shape() const;
    void setColor(const QColor &color)
        { myColor=color; }
    DiagramTextItem *startItem() const
        { return myStartItem; }
    DiagramTextItem *endItem() const
        { return myEndItem; }

    void removeLine(lineItem *line);
    void removeLines();
    bool addLine(lineItem *line);

    void createCorner(QPointF cornerPos, lineItem *inLine);
    void createCorner(QPointF cornerPos, int index);
    void moveCorner(QPointF cornerPos, lineItem *inLine);

    void setVisibleCorners(bool visible);

    void snapToGrid(QGraphicsSceneMouseEvent *event);

    QDomDocument toXmlFormat();

    QPointF startOffset() const
        { return myStartItem->offset();}

    QPointF endOffset() const
        { return myEndItem->offset();}

    DiagramItem  *startOwner() const
        { return myStartItem->ownerItem();}
    DiagramItem  *endOwner() const
        { return myEndItem->ownerItem();}

    QDomElement toXml(QDomDocument &,QList<DiagramItem*>) const;

public slots:
    void updatePosition();

protected:
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
               QWidget *widget = 0);
    void mousePressEvent(QGraphicsSceneMouseEvent *event);
    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
    void mouseMoveEvent(QGraphicsSceneMouseEvent *event);

private:
    DiagramTextItem *myStartItem;
    DiagramTextItem *myEndItem;
    QColor myColor;
    QPolygonF arrowHeadEnd;
    QPolygonF arrowHeadStart;
    QList<lineItem *> myLines;
    QList<lineItem *> myCLines;
    QList<QPointF> myCorners;
    QGraphicsScene *myOwnerScene;
    qreal arrowSize;    
    bool moving;
    QPointF previousPos;
};

#endif