qelectrotech-source-mirror/sources/editor/graphicspart/partline.h

/*
	Copyright 2006-2020 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_LINE_H
#define PART_LINE_H

#include "customelementgraphicpart.h"
#include "qet.h"

class QPropertyUndoCommand;
class QetGraphicsHandlerItem;

/**
	This class represents a line primitive which may be used to compose the
	drawing of an electrical element within the element editor. Lines may have
	specific visual ends (e.g. arrows) through the setFirstEndType and
	setSecondEndType methods. Their size can be defined using the
	setFirstEndLength and setSecondEndLength methods. Please note ends are not
	drawn if the required length for their drawing is longer than the line itself.
	In case there is room for a single end only, the first one get priority.
*/
class PartLine : public CustomElementGraphicPart
{
		Q_OBJECT

		Q_PROPERTY(Qet::EndType end1 READ firstEndType WRITE setFirstEndType)
		Q_PROPERTY(Qet::EndType end2 READ secondEndType WRITE setSecondEndType)
		Q_PROPERTY(qreal length1 READ firstEndLength WRITE setFirstEndLength)
		Q_PROPERTY(qreal length2 READ secondEndLength WRITE setSecondEndLength)
		Q_PROPERTY(QLineF line READ line WRITE setLine)

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

	signals:
		void lineChanged();
		void firstEndTypeChanged();
		void secondEndTypeChanged();
		void firstEndLengthChanged();
		void secondEndLengthChanged();

	
	// methods
	public:
		enum { Type = UserType + 1104 };
	
		 /**
			Enable the use of qgraphicsitem_cast to safely cast a QGraphicsItem into a PartLine.
			@return the QGraphicsItem type
		 */
		int type() const override { return Type; }
		void paint(QPainter *, const QStyleOptionGraphicsItem *, QWidget * = nullptr) override;
		QString name() const override { return(QObject::tr("ligne", "element part name")); }
		QString xmlName() const override { return(QString("line")); }
        QDomElement toXml(QDomDocument &) const override;
        bool fromXml(const QDomElement &) override;
        bool valideXml(QDomElement& element) const;
		virtual QPointF sceneP1() const;
		virtual QPointF sceneP2() const;
		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;
		static uint requiredLengthForEndType(const Qet::EndType &);
		static QList<QPointF> fourEndPoints(const QPointF &, const QPointF &, const qreal &);

		QLineF line() const;
		void setLine(const QLineF &line);
		Qet::EndType firstEndType() const {return first_end;}
		void setFirstEndType(const Qet::EndType &et);
		Qet::EndType secondEndType() const {return second_end;}
		void setSecondEndType(const Qet::EndType &et);
		qreal firstEndLength() const {return first_length;}
		void setFirstEndLength(const qreal &l);
		qreal secondEndLength() const {return second_length;}
		void setSecondEndLength(const qreal &l);

	protected:
		QVariant itemChange(GraphicsItemChange change, const QVariant &value) override;
		bool sceneEventFilter(QGraphicsItem *watched, QEvent *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();
		
		QPainterPath path() const;
		QRectF firstEndCircleRect() const;
		QRectF secondEndCircleRect() const;

		/*****************/
		Qet::EndType first_end;
        qreal        first_length{1.5};

		Qet::EndType second_end;
        qreal        second_length{1.5};
		QList<QPointF> saved_points_;
		QLineF m_line;
		int m_vector_index = -1;
		QPropertyUndoCommand *m_undo_command;
		QVector<QetGraphicsHandlerItem *> m_handler_vector;
};
#endif