void Connection::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
QGraphicsObject::mouseReleaseEvent(event);
if (drag_state == CONNECTED)
return;
ungrabMouse();
clearFocus();
setFlag(QGraphicsItem::ItemIsFocusable, false);
InputPort* target = gscene()->getInputPortAt(endPos());
Datum* datum = target ? target->getDatum() : NULL;
if (target && datum->acceptsLink(link))
{
datum->addLink(link);
drag_state = CONNECTED;
connect(endInspector(), &NodeInspector::moved,
this, &Connection::onInspectorMoved);
connect(endInspector(), &NodeInspector::hiddenChanged,
this, &Connection::onHiddenChanged);
App::instance()->pushStack(new UndoAddLinkCommand(link));
}
else
{
link->deleteLater();
}
prepareGeometryChange();
}
InputPort* NodeInspector::inputPort(const Datum* d) const
{
for (auto row : rows)
for (auto a : row->childItems())
{
InputPort* p = dynamic_cast<InputPort*>(a);
if (p && p->getDatum() == d)
return p;
}
return NULL;
}
InputPort* Canvas::getInputPortNear(QPointF pos, Link* link) const
{
float distance = INFINITY;
InputPort* port = NULL;
for (auto i : scene->items())
{
InputPort* p = dynamic_cast<InputPort*>(i);
if (p && (link == NULL || p->getDatum()->acceptsLink(link)))
{
QPointF delta = p->mapToScene(p->boundingRect().center()) - pos;
float d = QPointF::dotProduct(delta, delta);
if (d < distance)
{
distance = d;
port = p;
}
}
}
return port;
}