C++ Qt QCloseEvent不起作用

Question

我想在用户按下退出按钮时在新窗口中创建一条消息。因此，我创建了一个QCloseEvent，但MainWindow实际上并没有关闭。我究竟做错了什么？

Mainwindow.h

class MainWindow : public QMainWindow 
{ 
    Q_OBJECT 

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

    //Destructor 
    ~MainWindow(); 

public slots: 
    void closeMainWindow(); 

private: 
    QCloseEvent *event; 

MainWindow.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

您必须实现主窗口的closeEvent功能！

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(); 
} 

Answer 2

你缺少的close（）函数

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

或覆盖的closeEvent（）的主窗口

请参考以下链接功能： Generating a QCloseEvent won't close QMainWindow