某些情况下，keyPressEvent无法匹配快捷键的解决办法
if (event->type() == QEvent::KeyPress)
{
QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
if (keyEvent->matches(QKeySequence::Save))
{
// Do save
}
}
上面这段代码有时无法按预期执行。解决办法也很简单，像下面这样写即可：
if (event->type() == QEvent::KeyPress || event->type() == QEvent::ShortcutOverride)
{
QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
if (keyEvent->matches(QKeySequence::Save))
{
// Do save
}
}
很简单，就是多匹配一个条件：
|| event->type() == QEvent::ShortcutOverride
