QGraphicsItem subclass compilation error

[^NyAw^]

Hi,

I have a class that inherit from QGrpahicsEllipseItem to let it emit a signal when it is selected

#ifndef QDEFECTITEM_H
#define QDEFECTITEM_H
 
#include <QGraphicsEllipseItem>
 
class QDefectItem : public QGraphicsEllipseItem
{
	Q_OBJECT
 
public:
	QDefectItem();
	~QDefectItem();
 
protected:
	QVariant itemChange(GraphicsItemChange change, const QVariant &value);
 
signals:
	void itemSelected(QGraphicsItem*);
};
 
#endif // QDEFECTITEM_H

#ifndef QDEFECTITEM_H
#define QDEFECTITEM_H

#include <QGraphicsEllipseItem>

class QDefectItem : public QGraphicsEllipseItem
{
	Q_OBJECT

public:
	QDefectItem();
	~QDefectItem();

protected:
	QVariant itemChange(GraphicsItemChange change, const QVariant &value);

signals:
	void itemSelected(QGraphicsItem*);
};

#endif // QDEFECTITEM_H

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#include "QDefectItem.h"
 
QDefectItem::QDefectItem()
{
 
}
 
QDefectItem::~QDefectItem()
{
 
}
 
QVariant QDefectItem::itemChange(GraphicsItemChange change,const QVariant &value)
{
    if (change == QGraphicsItem::ItemSelectedChange)
		emit itemSelected(this);
    return value;
}

#include "QDefectItem.h"

QDefectItem::QDefectItem()
{

}

QDefectItem::~QDefectItem()
{

}

QVariant QDefectItem::itemChange(GraphicsItemChange change,const QVariant &value)
{
    if (change == QGraphicsItem::ItemSelectedChange)
		emit itemSelected(this);
    return value;
}

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This simple code returns an error when tryies to compile the generated moc file.
Missing something?

Thanks,

[Santosh Reddy]

To make use of signal/slots the class should be derived from directly or indirectly from QObject. QGraphicsEllipseItem does not have QObject in it's inheritnace tree. One thing you can do is, multiple inheritance of QObject and QGraphicsEllipseItem

class QDefectItem : public QObject, public QGraphicsEllipseItem
{
    Q_OBJECT
    ...
};

class QDefectItem : public QObject, public QGraphicsEllipseItem
{
    Q_OBJECT
    ...
};

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