Question

I have a QHeaderViewsubclass inside a QTreeView subclass, the header provides information to the delegates which affects how they paint themselves. The header receives mouse events that controls these values.

I also wanted my delegate editor widgets to provide the same functionality, but rather than copy and pasting the code that translates the mouse values into values the header could use, I thought it would be easier to re-send the QMouseEvent onto it.

So I copy the event and send it on (as noted in the docs):

QMouseEvent e( event->type(), event->pos(), event->button(),
               event->buttons(), event->modifiers() );
Sy_application::sendEvent( &header_, &e );

Only header_ never receives it. Posting the event has the same effect:

QMouseEvent* e = new QMouseEvent( QEvent::MouseButtonPress, event->pos(),
                                  event->button(), event->buttons(),
                                  event->modifiers() );
Sy_application::postEvent( &header_, e );

Why is header_ not receiving the event?

Answer 1

It seems my comment, about nothing in the parent classes causing this, must have been wrong. As an experiment I overrode event(QEvent* event) in my header class to call the mouse handlers manually, and now it works perfectly:

bool Sy_timeLineHeader::event( QEvent* event )
{
    switch ( event->type() ) {
    case QEvent::MouseButtonPress:
        mousePressEvent( static_cast< QMouseEvent* >( event ) ); break;
    case QEvent::MouseButtonRelease:
        mouseReleaseEvent( static_cast< QMouseEvent* >( event ) ); break;
    case QEvent::MouseMove:
        mouseMoveEvent( static_cast< QMouseEvent* >( event ) ); break;
    default:
        return QHeaderView::event( event );
    }

    return true;
}

It hasn’t affected the way the header operates normally, at least in so far as the way I am using it.