QGraphicsItem doesn't receive mouse hover events

Question

I have a class derived from QGraphicsView, which contains QGraphicsItem-derived elements. I want these elements to change color whenever the mouse cursor hovers over them, so I implemented hoverEnterEvent (and hoverLeaveEvent):

void MyGraphicsItem::hoverEnterEvent(QGraphicsSceneHoverEvent* event)
{
    update (boundingRect());
}

However, this event handler code is never executed. I've explicitly enabled mouse tracking:

MyGraphicsView::MyGraphicsView(MainView *parent) :
    QGraphicsView(parent)
{
    setMouseTracking(true);
    viewport()->setMouseTracking(true);
    ...
}

Still, no luck. What am I doing wrong?

score 38 · Accepted Answer · answered May 30 '10 at 21:39

38

Fixed it. I need to use setAcceptHoverEvents(true) in the constructor of my QGraphicsItem-derived class.

answered May 30 '10 at 21:39

Tony the Pony

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4

I had this same problem and removing the `mouseMoveEvent` implementation from my `QGraphicsView` was also necessary to fix it. Now that I have it working I could probably add `mouseMoveEvent` back in as long as I figure out a way for it to not eat up the `QEvent`. – Cory Klein Mar 05 '13 at 22:42
Thank you so much! You just ended great suffering – Freedom_Ben Aug 18 '13 at 16:50
@CoryKlein did you find the way to use both mouseMoveEvent and hover events? – lena Feb 29 '16 at 13:11
@lena honestly I don't remember – Cory Klein Feb 29 '16 at 13:13

score 7 · Answer 2 · answered Dec 20 '16 at 22:55

In my case, hover events wouldn't work if I overrode mouseMoveEvent in my implementation of the QGraphicsView class. I fixed this by adding a call to

QGraphicsView::mouseMoveEvent(event);

which propagated the event to the parent, which in turn sent it out to all the scene items.

QGraphicsItem doesn't receive mouse hover events

2 Answers2

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