Some options:

Qt Code:
  1. s1->assignProperty(splashScreen, "visible", true);
  2. s2->assignProperty(warningWindow, "visible", true);
  3.  
  4. // and a transition that triggers s1 -> s2 when the slash closes/times out.
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Qt Code:
  1. connect(s1, SIGNAL(entered()), someReceiver, SLOT(showSplash()));
  2. connect(s2, SIGNAL(entered()), someReceiver, SLOT(showWarning()));
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Cheers,
_