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connect(this, SIGNAL(sigChangeVisualState(UIVisualStateType)), parent(), SLOT(sltChangeVisualState(UIVisualStateType)));
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virtual UIVisualStateType visualStateType() const = 0;
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virtual bool prepareChange(UIVisualStateType previousVisualStateType)
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m_pMachineLogic = UIMachineLogic::create(this, m_pSession, visualStateType());