C++ QT OSX Qt::META+Qt::Key_Tab shortcut bind - c++

Question

I’m trying to bind Qt::META + Qt::Key_Tab shortcut in QTabWidget to switch tabs (like it works in chrome or many other applications).
I have tried every single solution found in google, but this shortcut combination is not working.
I have tried:
Combinations like Qt::Key_Control + Qt::Key_Tab, Qt::Key_Meta + Qt::Key_Tab, QKeySequence(Qt::Key_Meta, Qt::Key_Tab), QKeySequence(Qt::META, Qt::Key_Tab) etc.
QShortcut
QAction
capturing keys using virtual QWidget::event
capturing keys using virtual QWidget::eventFilter with installEventFilter
all relative like keyPressed and etc..
QWidget::event/QWidget::eventFilter catches Shift+Tab, Alt+Tab, but not Ctrl(META)+Tab. When I press Ctrl I see my qDebug output, when I press Ctrl + Tab nothing happens.
Can somebody explain me what is wrong and so special with this particular key combination in QT on OSX?
Doesn't matter what widget, I have created clean GUI project with no other widgets in it - still the same.
Some information:
OSX Mountain Lion 10.8.5
QT 5.2
BTW, In Qt Creator I’m not able to set Ctrl+Tab shortcut either, thats really ridiculous.
Note: It works great on Windows, it doesn't work on OSX!
I appreciate any help.
Simple code with QAction:
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
QAction *pAction = new QAction(this);
QKeySequence keySequence = Qt::META + Qt::Key_Tab; // Not working
// or
QKeySequence keySequence = Qt::ALT + Qt::Key_Tab; // Works Alt+Tab
// or
QKeySequence keySequence = QKeySequence(Qt::Key_Meta, Qt::Key_Tab); // Not working
// or
QKeySequence keySequence = QKeySequence(Qt::META, Qt::Key_Tab); // Not working
pAction->setShortcut(keySequence);
connect(pAction, SIGNAL(triggered()), this, SLOT(shortcut_NextTab()));
addAction(pAction);
}
And slot function:
void MainWindow::shortcut_NextTab()
{
qDebug() << "LOL";
}
Expecting to see LOL in Application output, when pressing Ctrl+Tab.

Answer 1

This seems to be a bug in Qt on Cocoa. See QTBUG-8596 and QTBUG-12232. The first bug report has a comment that says that it works if you add the QAction to the menu. I was experiencing the same problem as you, and that solution worked for me.

Answer 2

In this line:
QKeySequence keySequence = Qt::Key_Meta + Qt::Key_Tab;
You are just adding integers. Per QT documentation:
QKeySequence::QKeySequence ( int k1, int k2 = 0, int k3 = 0, int k4 = 0 )
Constructs a key sequence with up to 4 keys k1, k2, k3 and k4.
The key codes are listed in Qt::Key and can be combined with modifiers (see Qt::Modifier) such as Qt::SHIFT, Qt::CTRL, Qt::ALT, or Qt::META.
Meaning:
if you want a sequence, you need to use two-argument constructor to QKeySequence, not just add two integers together (which is what you are doing) and use one-argument constructor.
If you want a modifier - which I assume means holding a key down - use QT::Modifier, not Qt::Key_*.