/*
	Copyright 2006-2012 Xavier Guerrin
	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 ELEMENT_H
#define ELEMENT_H
#include <QtGui>
#include "terminal.h"
#include "orientationset.h"
class Diagram;
class ElementTextItem;
/**
	This is the base class for electrical elements.
*/
class Element : public QObject, public QGraphicsItem {
	
	Q_OBJECT
	Q_INTERFACES(QGraphicsItem)
	
	// constructors, destructor
	public:
	Element(QGraphicsItem * = 0, Diagram * = 0);
	virtual ~Element();
	
	private:
	Element(const Element &);
	
	// attributes
	public:
	enum { Type = UserType + 1000 };
	
	protected:
	/**
		Hold orientations for the element :
			* allowed orientations
			* current orientation
			* default orientation
		@see OrientationSet
	*/
	OrientationSet ori;
	
	private:
	QSize   dimensions;
	QPoint  hotspot_coord;
	QPixmap preview;
	
	// methods
	public:
	/**
		Enable the use of qgraphicsitem_cast to safely cast a QGraphicsItem into an
		Element.
		@return the QGraphicsItem type
	*/
	virtual int type() const { return Type; }
	
	// pure virtual methods to be defined in derived classes
	/// @return the list of terminals for this element
	virtual QList<Terminal *> terminals() const = 0;
	/// @return the list of conductors attached to this element
	virtual QList<Conductor *> conductors() const = 0;
	/// @return the list of text items attached to this element
	virtual QList<ElementTextItem *> texts() const = 0;
	/// @return the current number of terminals of this element
	virtual int terminalsCount() const = 0;
	/// @return the minimum number of terminals for this element
	virtual int minTerminalsCount() const = 0;
	/// @return the maximum number of terminals for this element
	virtual int maxTerminalsCount() const = 0;
	/**
		Draw this element
	*/
	virtual void paint(QPainter *, const QStyleOptionGraphicsItem *) = 0;
	/// @return This element type ID
	virtual QString typeId() const = 0;
	/// @return the human name for this element
	virtual QString name() const = 0;
	Diagram *diagram() const;
	
	virtual bool isHighlighted() const;
	virtual void setHighlighted(bool);
	void paint(QPainter *, const QStyleOptionGraphicsItem *, QWidget *);
	QRectF boundingRect() const;
	QSize setSize(int, int);
	QSize size() const;
	QPixmap  pixmap();
	
	// methods related to the hotspot
	QPoint setHotspot(QPoint);
	QPoint hotspot() const;
	
	// selection-related methods
	void select();
	void deselect();
	
	// position-related methods
	void setPos(const QPointF &);
	void setPos(qreal, qreal);
	
	// methods related to internal connections
	bool internalConnections();
	void setInternalConnections(bool);
	
	// methods related to XML import/export
	static bool valideXml(QDomElement &);
	virtual bool fromXml(QDomElement &, QHash<int, Terminal *> &, bool = false);
	virtual QDomElement toXml(QDomDocument &, QHash<Terminal *, int> &) const;
	
	// orientation-related methods
	bool setOrientation(QET::Orientation o);
	const OrientationSet &orientation() const;
	
	protected:
	void drawAxes(QPainter *, const QStyleOptionGraphicsItem *);
	void mousePressEvent(QGraphicsSceneMouseEvent *);
	void mouseMoveEvent(QGraphicsSceneMouseEvent *);
	void mouseReleaseEvent(QGraphicsSceneMouseEvent *);
	
	private:
	bool internal_connections_;
	bool must_highlight_;
	bool first_move_;
	void drawSelection(QPainter *, const QStyleOptionGraphicsItem *);
	void drawHighlight(QPainter *, const QStyleOptionGraphicsItem *);
	void updatePixmap();
};

/**
	Indicate whether this element allows internal connections, i.e. whether its
	terminals can be linked together using a conductor.
	@return true if internal connections are accepted, false otherwise
*/
inline bool Element::internalConnections() {
	return(internal_connections_);
}

/**
	Specify whether this element allows internal connections, i.e. whether its
	terminals can be linked together using a conductor.
	@return true for internal connections to be accepted, false otherwise
*/
inline void Element::setInternalConnections(bool ic) {
	internal_connections_ = ic;
}

/**
	Indicate the current orientation of this element
	@return the current orientation of this element
*/
inline const OrientationSet & Element::orientation() const {
	return(ori);
}

#endif