bool Connection::areInspectorsValid() const
{
return areNodesValid() &&
gscene()->getInspector(startNode()) &&
(drag_state != CONNECTED ||
gscene()->getInspector(endNode()));
}
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();
}
NodeInspector* Connection::endInspector() const
{
Q_ASSERT(drag_state == CONNECTED);
NodeInspector* i = gscene()->getInspector(endNode());
Q_ASSERT(i);
return i;
}
void Connection::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
QGraphicsObject::mouseReleaseEvent(event);
if (drag_state == CONNECTED)
return;
ungrabMouse();
clearFocus();
setFlag(QGraphicsItem::ItemIsFocusable, false);
InputPort* t = gscene()->getInputPortAt(endPos());
Datum* datum = target ? target->getDatum() : NULL;
if (t && datum->acceptsLink(source->getDatum()))
{
target = t;
t->install(this);
datum->installLink(source->getDatum());
drag_state = CONNECTED;
App::instance()->pushStack(
new UndoAddLinkCommand(source->getDatum(), datum));
onPortsMoved();
emit(changed());
}
else
{
deleteLater();
}
prepareGeometryChange();
}
void Connection::checkDragTarget()
{
target = gscene()->getInputPortAt(endPos());
if (target && target->getDatum()->acceptsLink(link))
drag_state = VALID;
else if (target)
drag_state = INVALID;
else
drag_state = NONE;
}
void Connection::updateSnap()
{
if (Port* p = gscene()->getInputPortNear(drag_pos, link))
{
has_snap_pos = true;
snap_pos = p->mapToScene(p->boundingRect().center());
}
else
{
has_snap_pos = false;
}
}
void Connection::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
if (drag_state == CONNECTED)
return;
drag_pos = event->pos();
if (snapping)
updateSnap();
gscene()->raiseInspectorAt(drag_pos);
checkDragTarget();
prepareGeometryChange();
}
NodeInspector* Connection::startInspector() const
{
NodeInspector* i = gscene()->getInspector(startNode());
Q_ASSERT(i);
return i;
}