Enable maximize button in QWizard - c++

Question

I have a Windows application that is built on QWizard (which inherits from QDialog). It must have a working maximization button.
By default maximization button is not even visible. i have set it to show, using:
auto flags = windowFlags();
flags ^= Qt::WindowContextHelpButtonHint;
flags |= Qt::WindowMinMaxButtonsHint;
setWindowFlags(flags);
However, it shows up disabled (grayed out, non-responding).
How can i enable it?

Answer 1

This works for me:
setWindowFlags(windowFlags() | Qt::CustomizeWindowHint |
Qt::WindowMinimizeButtonHint |
Qt::WindowMaximizeButtonHint |
Qt::WindowCloseButtonHint);
According to the documentation, you have to use the Qt::CustomizeWindowHint to be able to change the individual hints on the min/max buttons.

Answer 2

Someone here says this solved his problem:
setWindowFlags(Qt::Window);

Answer 3

I believe that you'll get better results creating your own dialog, but if you really wanna do it, one way is use window styles (Windows only, not cross-plataform).
Wizard class example:
class wizard : public QWizard
{
public:
wizard() {}
~wizard() {}
protected:
bool event(QEvent *event)
{
#ifdef Q_OS_WIN /*Make this code Windows OS only*/
if (event->type() == QEvent::WinIdChange)
{
HWND hwnd = (HWND)winId();
LONG lStyle = GetWindowLong(hwnd, GWL_STYLE);
lStyle |= (WS_MINIMIZEBOX | WS_MAXIMIZEBOX); /*Enable minimize and maximize*/
SetWindowLong(hwnd, GWL_STYLE, lStyle);
}
#endif
return QWizard::event(event);
}
};

Answer 4

I have this:
QWizard *wizard = new QWizard(this, Qt::CustomizeWindowHint | Qt::WindowMaximizeButtonHint | Qt::Window);
wizard->setSizeGripEnabled(true);
Running Windows 10 on my dev-box, Qt 5.5.1, working for me.
One of my pages is a big QTableWidget that ends up being like an Excel sheet of some sorts (a big page to verify and edit-in-place a lot of data). Making the window resizable and let the user maximize it if they want makes it much easier to work with, instead of having to constantly scroll in a small dialog.
Normally you would say: If you need such a big window, it probably shouldn't be in a QWizard. But in this case it's really the middle of a workflow thing. A big 'verify, edit-if-needed and continue' page so it would be weird to stop the QWizard before and then having to start another one after or something.