/**********************************************************************
 ElementItem - Element Item, part of the Periodic Table Graphics View for
 Kalzium

 Copyright (C) 2007-2009 by Marcus D. Hanwell
 Copyright (C) 2010 by Etienne Rebetez

 This file is part of the Avogadro molecular editor project.
 For more information, see <http://avogadro.openmolecules.net/>

 Kalzium 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; either version 2.1 of the License, or
 (at your option) any later version.

 Kalzium 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 ELEMENTITEM_H
#define ELEMENTITEM_H

#include <QGraphicsItem>
#include "kalziumdataobject.h"
#include "kalziumelementproperty.h"

#include <chemicaldataobject.h>

/**
* @class ElementItem
* @author Marcus D. Hanwell, Etienne Rebetez
* @brief An element item, intended to display a single element.
*
* This class implements a QGraphicsItem for displaying single elements in a
* perdiodic table. It currently allows the setting of the proton number.
* All other information come frome the kalziumElementProperty class.
*/
class ElementItem : public QGraphicsObject
{
    Q_OBJECT

public:
    /**
     * Constructor. Should be called with the element number for this item. The
     * constructor uses setData to set the element number using the key 0. This
     * is then used by PeriodicTable to figure out which element was clicked on.
     */
    ElementItem(KalziumElementProperty *property, int elementNumber = 0);

    /**
     * Destructor.
     */
    ~ElementItem();

    /**
     * @return the bounding rectangle of the element item.
     */
    QRectF boundingRect() const;

    /**
     * @return the painter path which is also a rectangle in this case.
     */
    QPainterPath shape() const;

    /**
     * This is where most of the action takes place. The element box is drawn
     * along with its symbol.
     */
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);

public Q_SLOTS:
    void redraw();

private:
    QString getCurrentElementValue();

    /**
     * Width of the elements.
     */
    int m_width;

    /**
     * Height of the elements.
     */
    int m_height;

    /**
     * The proton number of the item - all other attributes are derived from this.
     */
    int m_element;

    /**
     * The element numbers symbol.
     */
    QString m_symbol;

    /**
     * The color of the element which will also be used as the background color
     * for the item box.
     */
    QBrush m_brush;

    QColor m_textColor;

    QColor m_borderColor;

    QString m_textValue;

    KalziumElementProperty *m_property;

protected:
    void hoverEnterEvent(QGraphicsSceneHoverEvent *event);
    void hoverLeaveEvent(QGraphicsSceneHoverEvent *event);
};

#endif // ELEMENTITEM_H
