Dragging a rectangle across a QGraphicsView

I have a rectangle that I want to drag across a graphics view.

Code:

---

#ifndef BLOCK_H
#define BLOCK_H
 
#include <QGraphicsRectItem>
 
class Block : public QGraphicsRectItem
{
public:
    Block(int x, int y);
 
    // GUI events
    void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
};
 
#endif // BLOCK_H

---

Code:

---

#include <QPen>
#include <QLineF>
#include <QBrush>
#include <QApplication>
#include <QGraphicsRectItem>
#include <QGraphicsSceneEvent>
#include <iostream>
#include "block.h"
 
Block::Block(int x, int y) {
    this->setRect(x, y, 10, 10);
    this->setBrush(QBrush(QColor(0, 0, 0)));
    this->setPen(QPen(QColor(0, 0, 0)));
}
 
void Block::mouseMoveEvent(QGraphicsSceneMouseEvent *event) {
    // Is move above threshold?
    if (QLineF(event->screenPos(), event->buttonDownScreenPos(Qt::LeftButton)).length() < QApplication::startDragDistance())
        return;
 
    // Update x and y
    this->setPos(event->scenePos().x(), event->scenePos().y());
}

---

Edit: I already figured out that I should be using scene coordinates, but when I initiate a drag the selected element doesn't stick to the top left of my mouse pointer as shown here:
http://www.screentoaster.com/watch/s...X1BR/dragndrop

How can I fix this?

Make it more simple, check enum QGraphicsItem::ItemIsMovable.

D'oh... of course. Thanks!