問題描述

我正在使用 Qt 開發應用程序.我不知道哪個插槽對應于用戶單擊窗口框架的'X'(關閉)按鈕"的事件，即這個按鈕:

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:

如果沒有用于此的插槽，任何人都可以建議我一些其他方法，以便在用戶按下關閉按鈕后我可以啟動功能.

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.

推薦答案

如果你有一個 QMainWindow 你可以覆蓋 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();
    }
}

如果您要繼承 QDialog，則不會調用 closeEvent，因此您必須覆蓋 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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