Qt中鼠标点击的几种状态

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QPushButton* button = new QPushButton("clicked me", this);

    QObject::connect(button, &QPushButton::pressed, [&]() {
        qDebug() << "Button Pressed";
    });

    QObject::connect(button, &QPushButton::released, [&]() {
        qDebug() << "Button Released";
    });

    QObject::connect(button, &QPushButton::clicked, [&]() {
        qDebug() << "Button Clicked";
        QMessageBox::information(nullptr, "Button Clicked", "Button was clicked!");
    });

    button->show();
}

MainWindow::~MainWindow()
{
    delete ui;
}

#include <QApplication>
#include <QCheckBox>
#include <QDebug>

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

    QCheckBox checkBox("Toggle me!");

    QObject::connect(&checkBox, &QCheckBox::toggled, [&](bool checked) {
        qDebug() << "Checkbox Toggled: " << checked;
    });

    checkBox.show();

    return app.exec();
}