[Interest] Problem with setEnabled on QGraphicsItem

[Jean-Michaël Celerier]

Hello,

I am having some trouble with QGraphicsItem and mouse event forwarding.

The doc (5.4) states, about QGraphicsItem::setEnabled() :

Mouse events are discarded; they are not propagated unless the item is also
invisible, or if it does not accept mouse events (see
acceptedMouseButtons()).

However, I observe the following behaviour :

I have the two following methods :
void DeckView::enable()
{
    for(QGraphicsItem* item : childItems())
    {
    //    item->setEnabled(true);
        item->setAcceptedMouseButtons(Qt::AllButtons);
        item->setFlag(ItemStacksBehindParent, false);
    }
    delete m_overlay;
}

void DeckView::disable()
{
    for(QGraphicsItem* item : childItems())
    {
    //   item->setEnabled(false);
        item->setAcceptedMouseButtons(0);
        item->setFlag(ItemStacksBehindParent, true);
    }
    m_overlay = new DeckOverlay{this};
}

In this case, the event properly gets forwarded to the item under DeckView.
However, I have a child item which contains a QGraphicsProxyWidget, and the
widget still gets and reacts to the mouse events.

If I uncomment the "item->setEnabled(true);" lines, the
QGraphicsProxyWidget stops reacting to the mouse event, however, the mouse
event don't get passed to the item under anymore !
If I do "item->setInvisible(true);" the mouse event gets passed to the item
under again, but I want them to be visible... hence the
setAcceptedMouseButtons, but it does not change anything when disabled.


Any idea?
Best,

Jean-Michaël Celerier
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