Question

I have a custom class derived from QGraphicsPixmapItem. Its called GraphPixmapItemCustom and it’s overloaded method is:

void GraphPixmapItemCustom::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
    QGraphicsPixmapItem::mousePressEvent(event);
    GraphMarkItemCustom *ptr;

    if(event->button() == Qt::RightButton)
    {        
        qDebug("Before emit");
        emit addPoint(QPointF(event->pos().x(), event->pos().y()));
        qDebug("After emit");

        markList.append(new GraphMarkItemCustom(QPointF(event->pos().x(), event->pos().y())));
        ptr = markList.last();
        markGroup->addToGroup(ptr);
        //this->scene()->addItem(ptr);
    }
}

the signal is declared at header:

signals:
    void addPoint(QPointF position);

In main class that has a pointer to object of class GraphPixmapItemCustom called

private:
   GraphPixmapItemCustom *pixItemRGB; 

and in the main class I have a slot called:

private slots:
   void pointAdd(QPointF position);

In the main class constructor I have a connection:

connect(pixItemRGB, SIGNAL(addPoint(QPointF)), this, SLOT(pointAdd(QPointF)));

In the slot I have only qDebug("YUPPY IT ACTUALLY WORKS!");

But the slot is not beeing fired. Why? I have deleted all moc files and everything that didn’t have to be there. So only .pro, .h and .cpp files along with .ui forms where neccesary were left.

I have checked most hits at Google. What is the best (I’m not sured – maybe i modified something) that it worked! I remember the working effects of this connection. Help!

Answer 1

You have to connect the signal after creating the GraphPixmapItemCustom object with the new operator.