MouseMoveEvent when scrolling

petoknm

Hi
I was making some demo application when I realized I was getting mouseMoveEvents when scrolling. The position in the event is the last position of the mouse when it was released. I also made a small video documenting this visually. The code is for simulating waves by the way :D. But I moved the cursor away from the waves and scrolled you can see it generates disturbances in the waves. After a closer inspection I found out that they are getting called with the last position where the mouse was clicked. Is this a correct behaviour? If yes what is wrong with my code(I don't want to get mouse move events when scrolling... Is it a feature or a bug?)?

class MyGraphicsScene : public QGraphicsScene
{
Q_OBJECT
signals:
void mouseMoved(QPointF);
private:
void	mouseMoveEvent(QGraphicsSceneMouseEvent * mouseEvent);
};

void MyGraphicsScene::mouseMoveEvent(QGraphicsSceneMouseEvent *mouseEvent)
{
emit mouseMoved(mouseEvent->scenePos());
mouseEvent->accept(); // Actually I don't know if I should do this, but it doesn't affect this behaviour
}


class Wave1DWidget : public QGraphicsView
{
Q_OBJECT
...
MyGraphicsScene scene;
public slots:
void sceneMouseMoved(QPointF);
...
}

Wave1DWidget constructor{
...
connect(&scene,SIGNAL(mouseMoved(QPointF)),this,SLOT(sceneMouseMoved(QPointF)));
...
}

void Wave1DWidget::sceneMouseMoved(QPointF pos)
{
cout <<pos.x() << ", " << pos.y() << endl;
... // handling the move event like setting the height of the wave at that point…
}

[Edit: added missing coding tags: ```before and after the code SGaist]