如何使用Qt禁用Alt + F4窗口关闭? [英] How can I disable Alt + F4 window closing using Qt?

问题描述

我已使用以下行从对话框中禁用了Qt中的X按钮:

I've disabled X button in Qt from my dialog using this line:

myDialog->setWindowFlags(Qt::Dialog | Qt::Desktop)

但是我无法使用以下代码检测到 Alt + F4 :

but I couldn't detect Alt + F4 using this code:

void myClass::keyPressEvent(QKeyEvent *e)
{
    if ((e->key()==Qt::Key_F4) && (e->modifiers()==Qt::AltModifier))
        doSomething();
}

我应该怎么做才能检测 Alt + F4 或在Qt中将其禁用?

what should I do to detect Alt+F4 or disable it in Qt?

推荐答案

按下Alt+F4会导致将关闭事件发送到顶级窗口.在您的窗口类中，您可以覆盖closeEvent()来忽略它并阻止您的应用程序关闭.

Pressing Alt+F4 results in a close event being sent to your top level window. In your window class, you can override closeEvent() to ignore it and prevent your application from closing.

void MainWindow::closeEvent(QCloseEvent * event)
{
    event->ignore();
}

如果使关闭按钮(X)保持可见状态，则此方法还将使它无法关闭应用程序.

If you left the close button (X) visible, this method would also disable it from closing your app.

通常用于使应用程序有机会确定它是否要关闭或通过显示您确定吗?"来询问用户.消息框.

This is usually used to give the application a chance to decide if it wants to close or not or ask the user by displaying an "Are you sure?" message box.

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