[Solved] QGraphicsObject with child groups mousePressEvent not firing

mirswith

After lots of googling and testing I am stuck. I have a derived QGraphicsObject that contains a number of QGraphicsGroup's and QGraphicsItem's and for the life of me I am unable to get the mousePressEvent to fire for my object, interestingly enough my objects boundRect() does get called when I click the graphics view.

The constructor of my QGraphicsItem looks something like this:

@
MyItem::MyItem(QGraphicsItem * parent) : QGraphicsObject(parent)
{
setFlags(QGraphicsItem::ItemIsSelectable);
setHandlesChildEvents(true);

_root = new QGraphicsItemGroup();
_root->setParentItem(this);

QGraphicsRectItem * item = new QGraphicsRectItem();
item->setRect(0, 0, 100, 100);
_root->addToGroup(item);

}
@

I continue to add many more items but for readability lets assume I just have a rectangle that is 100x100. Next I override the boundRect() function:

@
QRectF MyItem::boundingRect() const
{
return QRectF(-50, -50, 50, 50);
}
@

My object is being painted correctly but I simply do not get mouse events. I am using the default QGraphicsScene and QGraphicsView. I have tried all the combinations of setting setHandlesChildEvents on myself and _root, but that does not seem to make a difference. Any ideas?

Thanks!

andre

Could you show your declaration of your mouse event handler?

mirswith

Definitely!

@
void MyItem::mousePressEvent(QGraphicsSceneMouseEvent * event)
{
if( event->button()==Qt::LeftButton )
{
// do something
}
}
@

mirswith

Ok, this is strange. I created a test app thinking I would post it here to demonstrate the problem however in my test app it works great so clearly it is something I am doing wrong. I'll post my solution once I find one here.

mirswith

Found my problem. I was adding MyItem objects to a group and then adding that group to my scene, turns out if I set setHandlesChildEvents to false on my group then it allows MyItem to get the mouse events as normal.

Hope this is helpful.