Handling mousePressEvent for overlapping graphics items

Question

I have two different classes inheriting QGraphicsItem. Both of them have their specific mousePressEvent functions. When these items overlap on the scene, I want to execute only one of the items' mousePressEvent. How can I achieve this?

void PpiTargetItem::hoverEnterEvent(QGraphicsSceneHoverEvent *event) {
    mTargetColor = Qt::red;
    event->setAccepted(true);
}

// Bigger Item
void CriticalRegion::hoverEnterEvent(QGraphicsSceneHoverEvent *event) {
    LOGGER_START
    mCorners[0] = new CornerGrabber(this, 0);
    mCorners[1] = new CornerGrabber(this, 1);
    mCorners[2] = new CornerGrabber(this, 2);
    mCorners[3] = new CornerGrabber(this, 3);

    mCorners[0]->installSceneEventFilter(this);
    mCorners[1]->installSceneEventFilter(this);
    mCorners[2]->installSceneEventFilter(this);
    mCorners[3]->installSceneEventFilter(this);

    setCornerPositions();
    event->setAccepted(true);
    LOGGER_END
}

By the way, there is a sceneEventFilter() in one of the items (no mousePressEvent function) and I think it might be preventing the other item to take mousePress events. — fatma.ekici

TheDarkKnight TheDarkKnight · Accepted Answer · 2013-09-17T12:53:32

When you inherit from QGraphicsItem and implement the function

void QGraphicsItem::mousePressEvent(QGraphicsSceneMouseEvent * event)

Call event->accept() when the object wanting to deal with the event has done so. If this doesn't work for you, please add example code to your question.

Handling mousePressEvent for overlapping graphics items

2 Answers