C:/Users/David/Documents/QtProjects/visualsc/scgraphicsview/cornergrabber.h

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/*
    visualsc - Visual State Chart Editing for SCXML State Engines
    Copyright (C) 2011  David W. Drell (david@davidwdrell.net) and
    Contributing Authors:


    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 3 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, see <http://www.gnu.org/licenses/>.
*/

#ifndef CORNERGRABBER_H
#define CORNERGRABBER_H

#include <QObject>
#include <QGraphicsItem>
#include <QGraphicsRectItem>
#include <QGraphicsTextItem>
#include <QGraphicsSceneHoverEvent>
#include <QGraphicsSceneMouseEvent>
#include <QColor>
#include <QPainter>
#include <QPen>
#include <QPointF>



class CornerGrabber : public QGraphicsItem
{

public:
    explicit CornerGrabber(QGraphicsItem *parent = 0,  int corner=0, bool placedOnASquare=false);

    int  getCorner(); 
    void setMouseState(int); 
    int  getMouseState(); 
    QPointF getCenterPoint();

    qreal mouseDownX;
    qreal mouseDownY;

     enum {kMouseReleased=0, kMouseDown, kMouseMoving}; 

     enum PaintStyle {kBox, kCrossHair};
     void setPaintStyle(PaintStyle s);

   virtual QRectF boundingRect() const; 

private:


    virtual void paint (QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget); 
    virtual void hoverEnterEvent ( QGraphicsSceneHoverEvent * event ); 
    virtual void hoverLeaveEvent ( QGraphicsSceneHoverEvent * event ); 

    // once the hover event handlers are implemented in this class,
    // the mouse events must also be implemented because of
    // some linkage issue - apparrently there is some connection
    // between the hover events and mouseMove/Press/Release
    // events which triggers a vtable issue
    virtual void mouseMoveEvent ( QGraphicsSceneMouseEvent * event );
    virtual void mouseMoveEvent(QGraphicsSceneDragDropEvent *event);
    virtual void mousePressEvent (QGraphicsSceneMouseEvent * event );
    virtual void mousePressEvent(QGraphicsSceneDragDropEvent *event);
    virtual void mouseReleaseEvent (QGraphicsSceneMouseEvent * event );

    QColor _outterborderColor; 
    QPen _outterborderPen; 

    qreal   _width;
    qreal   _height;

    int _corner;// 0,1,2,3  - starting at x=0,y=0 and moving clockwise around the box

    int _mouseButtonState;
    bool _placedOnASquare;

    PaintStyle _paintStyle;

};

#endif // CORNERGRABBER_H