在鼠标单击Qt时将信号从子对象发送到父对象

#include <QObject>
#include <QMouseEvent>

class MyChildObject : public QObject
{
    Q_OBJECT
public:
    explicit MyChildObject(QObject *parent = nullptr);

signals:
    void mouseClicked();

protected:
    void mousePressEvent(QMouseEvent *event) override;
};

#include "MyChildObject.h"

MyChildObject::MyChildObject(QObject *parent) : QObject(parent)
{

}

void MyChildObject::mousePressEvent(QMouseEvent *event)
{
    if(event->button() == Qt::LeftButton)
    {
        emit mouseClicked(); // 触发信号
    }
}

#include <QObject>
#include <QDebug>

class MyParentObject : public QObject
{
    Q_OBJECT
public:
    explicit MyParentObject(QObject *parent = nullptr);

public slots:
    void handleMouseClick(); // 槽函数

private:
    MyChildObject *childObject;
};

#include "MyParentObject.h"

MyParentObject::MyParentObject(QObject *parent) : QObject(parent)
{
    childObject = new MyChildObject(this);

    // 连接信号和槽函数
    connect(childObject, &MyChildObject::mouseClicked, this, &MyParentObject::handleMouseClick);
}

void MyParentObject::handleMouseClick()
{
    qDebug() << "Mouse clicked!";
}