C ++ Qt QCloseEvent不起作用

Question

当用户按下退出按钮时，我想创建一个显示在新窗口中的消息。因此我创建了一个QCloseEvent，但MainWindow实际上根本没有关闭。我究竟做错了什么？

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mainwindow的closeEvent功能！

e.g

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

您缺少close（）函数

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

或覆盖MainWindow的closeEvent（）函数

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