在QGraphicsItems之间使用QSignalMapper进行通信

#include <QApplication>
#include <QGraphicsView>
#include <QGraphicsScene>
#include <QGraphicsRectItem>
#include <QSignalMapper>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QGraphicsScene scene;
    QGraphicsView view(&scene);

    QSignalMapper *signalMapper = new QSignalMapper(&view);

    for (int i = 0; i < 5; ++i) {
        QGraphicsRectItem *rectItem = scene.addRect(QRectF(0, 0, 50, 50));
        rectItem->setPos(i * 60, 0);
        connect(rectItem, &QGraphicsRectItem::mousePressEvent, signalMapper, QOverload<QGraphicsSceneMouseEvent *>::of(&QSignalMapper::map));
        signalMapper->setMapping(rectItem, i);
    }

    connect(signalMapper, QOverload<int>::of(&QSignalMapper::mapped), [](int id) {
        qDebug() << "Clicked item with ID:" << id;
    });

    view.show();
    return app.exec();
}