Context Menu on QGraphicsWidget - c++

Question

In my application I have two object type. One is field item, other is composite item.
Composite items may contain two or more field items.
Here is my composite item implementation.
#include "compositeitem.h"
CompositeItem::CompositeItem(QString id,QList<FieldItem *> _children)
{
children = _children;
}
CompositeItem::~CompositeItem()
{
}
QRectF CompositeItem::boundingRect() const
{
FieldItem *child;
QRectF rect(0,0,0,0);
foreach(child,children)
{
rect = rect.united(child->boundingRect());
}
return rect;
}
void CompositeItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget )
{
FieldItem *child;
foreach(child,children)
{
child->paint(painter,option,widget);
}
}
QSizeF CompositeItem::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
{
QSizeF itsSize(0,0);
FieldItem *child;
foreach(child,children)
{
// if its size empty set first child size to itsSize
if(itsSize.isEmpty())
itsSize = child->sizeHint(Qt::PreferredSize);
else
{
QSizeF childSize = child->sizeHint(Qt::PreferredSize);
if(itsSize.width() < childSize.width())
itsSize.setWidth(childSize.width());
itsSize.setHeight(itsSize.height() + childSize.height());
}
}
return itsSize;
}
void CompositeItem::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
{
qDebug()<<"Test";
}
My first question is how I can propagate context menu event to specific child.
Picture on the above demonstrates one of my possible composite item.
If you look on the code above you will see that I print "Test" when context menu event occurs.
When I right click on the line symbol I see that "Test" message is printed.
But when I right click on the signal symbol "Test" is not printed and I want it to be printed.
My second question what cause this behaviour.
How do I overcome this.

Answer 1

Could you try reimplementing your contextMenu with the mouseRelease event instead?
void CompositeItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
if(event->button() == Qt::RightButton)
{
contextMenu->popup(QCursor::pos());
}
}

Answer 2

I figured out that there may be two solutions for catching events.
First one is reimplementing shape function.
In my case it will be implemented like this.
QPainterPath shape() const
{
QPainterPath path;
path.addRect(boundingRect());
return path;
}
Second one is to use QGraphicsItemGroup
It will be good idea to use QGraphicsItemGroup if you diretly adding your items to scene. But in my case I have to subclass QGraphicsItemGroup because of I am using a layout.
So temporarily I choose writing my own item.