C++ Qt QCloseEvent 不起作用

Question

我想创建一条消息，当用户按下退出按钮时，该消息会出现在新窗口中。为此，我创建了一个 QCloseEvent，但 MainWindow 实际上根本没有关闭。我究竟做错了什么？

主窗口.h

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    //Constructor
    explicit MainWindow(QWidget *parent = 0);

    //Destructor
    ~MainWindow();

public slots:
    void closeMainWindow();

private:
    QCloseEvent *event;

主窗口.cpp

void MainWindow::closeMainWindow(){

    event = new QCloseEvent();
    QMessageBox::StandardButton answer = QMessageBox::question(
                this,
                tr("Close the Window"),
                tr("Do you want to close the window?"),
                QMessageBox::Yes | QMessageBox::No);

    if(answer == QMessageBox::Yes){
        event->accept();
    }
    else
        event->ignore();
}

Answer 1

您必须实现 closeEvent主窗口的功能!

例如

void MyMainWindow::closeEvent(QCloseEvent *event)
{
    QMessageBox::StandardButton answer = QMessageBox::question(
                this,
                tr("Close the Window"),
                tr("Do you want to close the window?"),
                QMessageBox::Yes | QMessageBox::No);

    if(answer == QMessageBox::Yes){
        event->accept();
    }
    else
        event->ignore();
}