I've disabled X button in Qt from my dialog using this line:
myDialog->setWindowFlags(Qt::Dialog | Qt::Desktop)
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();
}
what should I do to detect Alt+F4 or disable it in Qt?
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();
}
If you left the close button (X) visible, this method would also disable it from closing your app.
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.
The code below prevents a dialog close when pressed Alt+F4, [X] or Escape, but not by calling SomeDialog::close() method.
void SomeDialog::closeEvent(QCloseEvent *evt) {
evt->setAccepted( !evt->spontaneous() );
}
void SomeDialog::keyPressEvent(QKeyEvent *evt) {
// must be overridden but empty if the only you need is to prevent closing by Escape
}
good luck to all of us ;)
Also you can handle the event in your dialog's class (at least if it's modal dlg):
void MyDialog::closeEvent(QCloseEvent* e)
{
if ( condition )
e->ignore();
else
__super::closeEvent(e);
}
来源:https://stackoverflow.com/questions/10369826/how-can-i-disable-alt-f4-window-closing-using-qt