/**
* Sets the first widget in the association using the current widget.
* If the widget can't be associated using the current type of association,
* an error is shown and the widget isn't set.
* Otherwise, the temporal visual association is created and the mouse
* tracking is enabled, so move events will be delivered.
*/
void ToolBarStateAssociation::setFirstWidget()
{
UMLWidget* widget = currentWidget();
Uml::AssociationType::Enum type = getAssociationType();
if (!AssocRules::allowAssociation(type, widget)) {
//TODO improve error feedback: tell the user what are the valid type of associations for
//that widget
KMessageBox::error(0, i18n("Incorrect use of associations."), i18n("Association Error"));
return;
}
//set up position
QPoint pos;
pos.setX(widget->x() + (widget->width() / 2));
pos.setY(widget->y() + (widget->height() / 2));
//TODO why is this needed?
m_pUMLScene->setPos(pos);
m_firstWidget = widget;
m_associationLine = new QGraphicsLineItem();
m_pUMLScene->addItem(m_associationLine);
m_associationLine->setLine(pos.x(), pos.y(), pos.x(), pos.y());
m_associationLine->setPen(QPen(m_pUMLScene->lineColor(), m_pUMLScene->lineWidth(), Qt::DashLine));
m_associationLine->setVisible(true);
m_pUMLScene->activeView()->viewport()->setMouseTracking(true);
}
/**
* Moves the point or line if active.
*/
void AssociationLine::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
UMLScene* scene = m_associationWidget->umlScene();
QPointF oldPos = event->scenePos();
QPointF newPos(
scene->snappedX(oldPos.x()),
scene->snappedY(oldPos.y())
);
// Prevent the moving vertex from disappearing underneath a widget
// (else there's no way to get it back.)
UMLWidget *onW = scene->widgetAt(newPos);
if (onW && onW->baseType() != WidgetBase::wt_Box) { // boxes are transparent
const qreal pX = newPos.x();
const qreal pY = newPos.y();
const qreal wX = onW->x();
const qreal wY = onW->y();
const qreal wWidth = onW->width();
const qreal wHeight = onW->height();
if (pX > wX && pX < wX + wWidth) {
const qreal midX = wX + wWidth / 2.0;
if (pX <= midX)
newPos.setX(wX);
else
newPos.setX(wX + wWidth);
}
if (pY > wY && pY < wY + wHeight) {
const qreal midY = wY + wHeight / 2.0;
if (pY <= midY)
newPos.setY(wY);
else
newPos.setY(wY + wHeight);
}
}
if (m_activePointIndex != -1) {
// Move a single point (snap behaviour)
setPoint(m_activePointIndex, newPos);
}
else if (m_activeSegmentIndex != -1 && !isEndSegmentIndex(m_activeSegmentIndex)) {
// Move a segment (between two points, snap behaviour not implemented)
QPointF delta = event->scenePos() - event->lastScenePos();
setPoint(m_activeSegmentIndex, m_points[m_activeSegmentIndex] + delta);
setPoint(m_activeSegmentIndex + 1, m_points[m_activeSegmentIndex + 1] + delta);
}
}