在C++中连接/绑定两个QML属性

// PropertyConnector.h
#ifndef PROPERTYCONNECTOR_H
#define PROPERTYCONNECTOR_H

#include <QObject>

class PropertyConnector : public QObject
{
    Q_OBJECT
    Q_PROPERTY(int qmlProperty1 READ getQmlProperty1 WRITE setQmlProperty1 NOTIFY qmlProperty1Changed)
    Q_PROPERTY(int qmlProperty2 READ getQmlProperty2 WRITE setQmlProperty2 NOTIFY qmlProperty2Changed)

public:
    explicit PropertyConnector(QObject *parent = nullptr);

    int getQmlProperty1() const;
    void setQmlProperty1(int value);

    int getQmlProperty2() const;
    void setQmlProperty2(int value);

signals:
    void qmlProperty1Changed();
    void qmlProperty2Changed();

private:
    int m_qmlProperty1;
    int m_qmlProperty2;
};

#endif // PROPERTYCONNECTOR_H

// PropertyConnector.cpp
#include "PropertyConnector.h"

PropertyConnector::PropertyConnector(QObject *parent) : QObject(parent), m_qmlProperty1(0), m_qmlProperty2(0)
{
    connect(this, &PropertyConnector::qmlProperty1Changed, this, [this]() {
        emit qmlProperty2Changed();
    });

    connect(this, &PropertyConnector::qmlProperty2Changed, this, [this]() {
        emit qmlProperty1Changed();
    });
}

int PropertyConnector::getQmlProperty1() const
{
    return m_qmlProperty1;
}

void PropertyConnector::setQmlProperty1(int value)
{
    if (m_qmlProperty1 != value) {
        m_qmlProperty1 = value;
        emit qmlProperty1Changed();
    }
}

int PropertyConnector::getQmlProperty2() const
{
    return m_qmlProperty2;
}

void PropertyConnector::setQmlProperty2(int value)
{
    if (m_qmlProperty2 != value) {
        m_qmlProperty2 = value;
        emit qmlProperty2Changed();
    }
}

import QtQuick 2.0

Item {
    width: 200
    height: 200

    PropertyConnector {
        id: connector
    }

    property int qmlProperty1: connector.qmlProperty1
    property int qmlProperty2: connector.qmlProperty2

    onQmlProperty1Changed: {
        console.log("qmlProperty1 changed:", qmlProperty1)
    }

    onQmlProperty2Changed: {
        console.log("qmlProperty2 changed:", qmlProperty2)
    }
}