void QWidget::setWindowState ( Qt::WindowStates windowState )
Sets the window state to windowState. The window state is a OR'ed combination of Qt::WindowState: Qt::WindowMinimized, Qt::WindowMaximized, Qt::WindowFullScreen, and Qt::WindowActive.
If the window is not visible (i.e. isVisible() returns false), the window state will take effect when show() is called. For visible windows, the change is immediate. For example, to toggle between full-screen and normal mode, use the following code:
w->setWindowState(w->windowState() ^ Qt::WindowFullScreen);
In order to restore and activate a minimized window (while preserving its maximized and/or full-screen state), use the following:
w->setWindowState(w->windowState() & ~Qt::WindowMinimized | Qt::WindowActive);
Calling this function will hide the widget. You must call show() to make the widget visible again.
