Qt - Drag and Drop - Custom Graphic Scene - Event error

Question

I created simple d&d drop - soemthing like QT Creator menu - ListView on the side and DragScene (my own subclass of QGraphicsScene). I want to created new Graphic item ( i already got my custo mclasses for it) to be added there - in place where i dropped it. I created my own class:

DragScene.h

#include <QGraphicsScene>
#include <QDebug>
#include <QMimeData>

#include "CustomObj.h"

class DragScene : public QGraphicsScene
{
public:
    DragScene(QObject* parent = 0);

 protected:
     void dragEnterEvent(QGraphicsSceneDragDropEvent *event);
     void dragMoveEvent(QGraphicsSceneDragDropEvent *event);
     void dragLeaveEvent(QGraphicsSceneDragDropEvent *event);
     void dropEvent(QGraphicsSceneDragDropEvent *event);
};

DragScene.cpp

#include "DragScene.h"

DragScene::DragScene(QObject* parent)
    : QGraphicsScene(parent)
{
}

void DragScene::dragEnterEvent(QGraphicsSceneDragDropEvent *event)
{
}

void DragScene::dragMoveEvent(QGraphicsSceneDragDropEvent *event)
{
}

void DragScene::dragLeaveEvent(QGraphicsSceneDragDropEvent *event)
{
}

void DragScene::dropEvent(QGraphicsSceneDragDropEvent *event)
{
        CustomObj* newObject = new CustomObj(0,0,50,50);
  //      newObject->setPos(event->pos().x(), event->pos().y()); //(1)
        this->addItem(newObject);

        qDebug() <<"New object";
}

Now I jsut can't set those parameters. Everytime i try to use event (like in (1) ) in those functions I get errors:

invalid use of incomplete type 'class QGraphicsSceneDragDropEvent' newObject->setPos(event->pos().x(), event->pos().y()); ^

forward declaration of 'class QGraphicsSceneDragDropEvent' class QGraphicsSceneDragDropEvent; ^

invalid use of incomplete type 'class QGraphicsSceneDragDropEvent' newObject->setPos(event->pos().x(), event->pos().y()); ^

forward declaration of 'class QGraphicsSceneDragDropEvent' class QGraphicsSceneDragDropEvent; ^

I have no idea why anymore - i saw few exemples and those wre useing event without any trouble, like: Qt - drag and drop with graphics view framework

EDIT 1: Adding:

#include <QGraphicsSceneDragDropEvent>

recolved it, but now I can see my event isnt passing any position - every object is stted to (0,0).

Answer 1

How about this:

#include <QGraphicsSceneDragDropEvent>