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);
}

QPointF Item::anchorPos(AnchorType type) const
{
    // 对于"按钮"和"指示灯"类型，返回无效坐标
    if (type_ == "按钮" || type_ == "指示灯") {
        return QPointF(std::numeric_limits<qreal>::quiet_NaN(),
                      std::numeric_limits<qreal>::quiet_NaN());
    }

    // 其他类型正常返回连接点位置
    return mapToScene(type == Left ? QPointF(-18, 0) : QPointF(18, 0));
}

void Item::addConnection(Connection* conn)
{
    // 对于"按钮"和"指示灯"类型，不允许添加连接
    if (type_ == "按钮" || type_ == "指示灯")
    {
        return;
    }
    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_;
}

void Item::MenuActions(QMenu *menu)
{
    menu->addAction("复制");
    menu->addAction("删除");
    menu->addAction("对象");
}

void Item::addMenuActions(QMenu *menu)
{
    Q_UNUSED(menu);
}

void Item::handleMenuAction(QAction *action)
{
    if (action->text() == "复制") {
        emit requestCopy(this);
    }
    if (action->text() == "删除") {
        emit requestDelete(this);
    }
    if (action->text() == "对象"){
        emit requestBindRegister(this);
    }
}

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;

    // 创建菜单
    MenuActions(&menu);
    addMenuActions(&menu);

    // 执行菜单
    QAction *selected = menu.exec(event->screenPos());

    // 处理菜单动作
    if (selected) {
        handleMenuAction(selected);
    }
}