partpolygon.h

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/*
    Copyright 2006-2019 The QElectroTech Team
    This file is part of QElectroTech.
    
    QElectroTech 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.
    
    QElectroTech 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 QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef PART_POLYGON_H
#define PART_POLYGON_H

#include <QPolygonF>
#include "customelementgraphicpart.h"

class QPropertyUndoCommand;
class QetGraphicsHandlerItem;
class QAction;

class PartPolygon : public CustomElementGraphicPart
{
        Q_OBJECT

        Q_PROPERTY(bool closed READ isClosed WRITE setClosed)
        Q_PROPERTY(QPolygonF polygon READ polygon WRITE setPolygon)

        // constructors, destructor
    public:
        PartPolygon(QETElementEditor *editor, QGraphicsItem *parent = nullptr);
        ~PartPolygon() override;
    
    private:
        PartPolygon(const PartPolygon &);

    signals:
        void closedChange();
        void polygonChanged();

        // methods
    public:
        enum { Type = UserType + 1105 };
        int type() const override { return Type; }
        void paint(QPainter *, const QStyleOptionGraphicsItem *, QWidget *) override;

        QString name() const override { return(QObject::tr("polygone", "element part name")); }
        QString xmlName() const override { return(QString("polygon")); }
        void fromXml(const QDomElement &) override;
        const QDomElement toXml(QDomDocument &) const override;

        QPainterPath shape () const override;
        QPainterPath shadowShape() const override;
        QRectF boundingRect() const override;
        bool isUseless() const override;
        QRectF sceneGeometricRect() const override;

        void startUserTransformation(const QRectF &) override;
        void handleUserTransformation(const QRectF &, const QRectF &) override;
        QET::ScalingMethod preferredScalingMethod() const override;

        QPolygonF polygon () const;
        void setPolygon   (const QPolygonF &polygon);

        void addPoint        (const QPointF &point);
        void setLastPoint    (const QPointF &point);
        void removeLastPoint ();    

        bool isClosed  () const {return m_closed;}
        void setClosed (bool close);

    protected:
        QVariant itemChange(GraphicsItemChange change, const QVariant &value) override;
        bool sceneEventFilter(QGraphicsItem *watched, QEvent *event) override;
        void contextMenuEvent(QGraphicsSceneContextMenuEvent *event) override;
    
    private:
        void adjusteHandlerPos();
        void handlerMousePressEvent   (QetGraphicsHandlerItem *qghi, QGraphicsSceneMouseEvent *event);
        void handlerMouseMoveEvent    (QetGraphicsHandlerItem *qghi, QGraphicsSceneMouseEvent *event);
        void handlerMouseReleaseEvent (QetGraphicsHandlerItem *qghi, QGraphicsSceneMouseEvent *event);
        void sceneSelectionChanged ();
        
        void addHandler();
        void removeHandler();
        void insertPoint();
        void removePoint();
        
        
        bool m_closed;
        QList<QPointF> saved_points_;
        QPolygonF m_polygon;
        QPropertyUndoCommand *m_undo_command;
        int m_vector_index = -1;
        QVector<QetGraphicsHandlerItem *> m_handler_vector;
        QAction *m_insert_point,
                *m_remove_point;
        QPointF m_context_menu_pos;
};
#endif