/*
	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 DIAGRAM_TEXT_ITEM_H
#define DIAGRAM_TEXT_ITEM_H
#include <QtGui>
#include "diagram.h"
/**
	This class represents a selectable, movable and editable text field on a
	diagram.
	@see QGraphicsItem::GraphicsItemFlags
*/
class DiagramTextItem : public QGraphicsTextItem {
	Q_OBJECT
	// constructors, destructor
	public:
	DiagramTextItem(QGraphicsItem * = 0, Diagram * = 0);
	DiagramTextItem(const QString &, QGraphicsItem * = 0, Diagram * = 0);
	virtual ~DiagramTextItem();
	
	// attributes
	public:
	enum { Type = UserType + 1004 };
	
	// methods
	public:
	/**
		Enable the use of qgraphicsitem_cast to safely cast a QGraphicsItem into a
		DiagramTextItem
		@return the QGraphicsItem type
	*/
	virtual int type() const { return Type; }
	Diagram *diagram() const;
	virtual void fromXml(const QDomElement &) = 0;
	virtual QDomElement toXml(QDomDocument &) const = 0;
	virtual void setPos(const QPointF &);
	virtual void setPos(qreal, qreal);
	virtual QPointF pos() const;
	qreal rotationAngle() const;
	void setRotationAngle(const qreal &);
	void rotateBy(const qreal &);
	void edit();
	QPointF mapMovementToScene(const QPointF &) const;
	QPointF mapMovementFromScene(const QPointF &) const;
	QPointF mapMovementToParent(const QPointF &) const;
	QPointF mapMovementFromParent(const QPointF &) const;
	
	protected:
	virtual void paint(QPainter *, const QStyleOptionGraphicsItem *, QWidget *);
	virtual void focusInEvent(QFocusEvent *);
	virtual void focusOutEvent(QFocusEvent *);
	virtual void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *);
	virtual void applyRotation(const qreal &);
	
	signals:
	/// signal emitted when the text field loses focus
	void lostFocus();
	/// signal emitted after text was changed
	void diagramTextChanged(DiagramTextItem *, const QString &, const QString &);
	
	public slots:
	void setNonFocusable();
	void setHtmlText(const QString &);
	
	private:
	/// Previous text value
	QString previous_text_;
	/// angle of rotation of the text field
	qreal rotation_angle_;
};
#endif