Qt:如何处理用户按下“X"(关闭)按钮的事件?

Qt: How do I handle the event of the user pressing the #39;X#39; (close) button?(Qt:如何处理用户按下“X(关闭)按钮的事件?)

问题描述

我正在使用 Qt 开发应用程序.我不知道哪个插槽对应于用户单击窗口框架的'X'(关闭)按钮"的事件，即这个按钮:

I am developing an application using Qt. I don't know which slot corresponds to the event of "the user clicking the 'X'(close) button of the window frame" i.e. this button:

如果没有用于此的插槽，任何人都可以建议我一些其他方法，以便在用户按下关闭按钮后我可以启动功能.

If there isn't a slot for this, can anyone suggest me some other method by which I can start a function after the user presses that close button.

推荐答案

如果你有一个 QMainWindow 你可以覆盖 closeEvent 方法.

If you have a QMainWindow you can override closeEvent method.

#include <QCloseEvent>
void MainWindow::closeEvent (QCloseEvent *event)
{
    QMessageBox::StandardButton resBtn = QMessageBox::question( this, APP_NAME,
                                                                tr("Are you sure?
"),
                                                                QMessageBox::Cancel | QMessageBox::No | QMessageBox::Yes,
                                                                QMessageBox::Yes);
    if (resBtn != QMessageBox::Yes) {
        event->ignore();
    } else {
        event->accept();
    }
}

如果您要继承 QDialog，则不会调用 closeEvent，因此您必须覆盖 reject():

If you're subclassing a QDialog, the closeEvent will not be called and so you have to override reject():

void MyDialog::reject()
{
    QMessageBox::StandardButton resBtn = QMessageBox::Yes;
    if (changes) {
        resBtn = QMessageBox::question( this, APP_NAME,
                                        tr("Are you sure?
"),
                                        QMessageBox::Cancel | QMessageBox::No | QMessageBox::Yes,
                                        QMessageBox::Yes);
    }
    if (resBtn == QMessageBox::Yes) {
        QDialog::reject();
    }
}

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