editor/item.cpp

#include "item.h"
#include "connection.h"
#include <QMenu>
#include <QPainter>
#include <QStyleOptionGraphicsItem>
#include <QGraphicsSceneContextMenuEvent>

Item::Item(const QString &type, QGraphicsItem *parent)
    : QGraphicsObject(parent), type_(type)
{
    setFlags(QGraphicsItem::ItemIsMovable |
             QGraphicsItem::ItemIsSelectable |
             QGraphicsItem::ItemSendsGeometryChanges);
}

QRectF Item::boundingRect() const
{
    return QRectF(-22, -15, 44, 30);
}

void Item::paint(QPainter *painter,
                 const QStyleOptionGraphicsItem * option,
                 QWidget *)
{
    painter->setRenderHint(QPainter::Antialiasing);

    if (type_ == "线圈") {
        // 绘制线圈样式: 两边线段+中间椭圆
        painter->drawLine(-12, 0, -5, 0);
        painter->drawEllipse(QRectF(-5, -8, 10, 16));
        painter->drawLine(5, 0, 12, 0);

        // 画锚点
        painter->setBrush(Qt::darkGray);
        painter->setPen(Qt::NoPen);
        painter->drawEllipse(QPointF(-12, 0), 4, 4);   // 左锚点
        painter->drawEllipse(QPointF(12, 0), 4, 4);    // 右锚点
    }
    else if (type_ == "常开") {
        painter->drawLine(-12, 0, -4, 0);
        painter->drawLine(-4, -8, -4, 8);
        painter->drawLine(4, -8, 4, 8);
        painter->drawLine(4, 0, 12, 0);

        // 锚点
        painter->setBrush(Qt::darkGray);
        painter->setPen(Qt::NoPen);
        painter->drawEllipse(QPointF(-18, 0), 4, 4);   // 左
        painter->drawEllipse(QPointF(18, 0), 4, 4);    // 右
    }
    else if (type_ == "常闭") {
        painter->drawLine(-15, -10, 15, 10); // 对角线
        painter->drawLine(-12, 0, -4, 0);
        painter->drawLine(-4, -8, -4, 8);
        painter->drawLine(4, -8, 4, 8);
        painter->drawLine(4, 0, 12, 0);

        // 锚点
        painter->setBrush(Qt::darkGray);
        painter->setPen(Qt::NoPen);
        painter->drawEllipse(QPointF(-18, 0), 4, 4);   // 左
        painter->drawEllipse(QPointF(18, 0), 4, 4);    // 右
    }
    else if (type_ == "比较") {
        painter->drawRect(QRectF(-12, -8, 24, 16));
        painter->setFont(QFont("Arial", 8));
        painter->drawText(QRectF(-10, -8, 20, 16), Qt::AlignCenter, "CP");

        // 锚点
        painter->setBrush(Qt::darkGray);
        painter->setPen(Qt::NoPen);
        painter->drawEllipse(QPointF(-18, 0), 4, 4);
        painter->drawEllipse(QPointF(18, 0), 4, 4);
    }
    if (option->state & QStyle::State_Selected) {
        QPen pen(Qt::DashLine);
        pen.setColor(Qt::blue);
        pen.setWidth(2);
        painter->setPen(pen);
        painter->setBrush(Qt::NoBrush);
        painter->drawRect(boundingRect());
    }
}

QPointF Item::anchorPos(AnchorType type) const
{
    return mapToScene(type == Left ? QPointF(-18, 0) : QPointF(18, 0));
}

void Item::addConnection(Connection* conn)
{
    if (!connections_.contains(conn))
        connections_.append(conn);
}

void Item::removeConnection(Connection* conn)
{
    connections_.removeAll(conn);
}

QList<Connection *> Item::connections()
{
    return connections_;
}

QString Item::itemType()
{
    return type_;
}

QVariant Item::itemChange(GraphicsItemChange change, const QVariant &value)
{
    if (change == QGraphicsItem::ItemPositionChange) {
        for (Connection* conn : connections_)
            conn->updatePosition();
    }
    return QGraphicsObject::itemChange(change, value);
}

void Item::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
{
    QMenu menu;
    QAction* copyAct = menu.addAction("复制");
    QAction* deleteAct = menu.addAction("删除");
    QAction* selected = menu.exec(event->screenPos());
    if (selected == copyAct) {
        emit requestCopy(this);
    }
    if (selected == deleteAct) {
        emit requestDelete(this);
    }
}