qstmgesturelib/qstmstateengine.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 04 May 2010 12:39:35 +0300
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/*
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* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description: 
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*
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*/
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#ifndef QSTMSTATEENGINE_H_
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#define QSTMSTATEENGINE_H_
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#include "qstmuievent_if.h"
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#include "qstmtimerinterface.h"
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#include "qstmstatemachine_v2.h"
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#include "qstmstateengineconfig.h"
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#include "qstmuievent.h"
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#include <QtCore>
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namespace qstmUiEventEngine
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{
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class QStm_UiEvent;
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/*!
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 * Define THwEvent since we need the point, the type and timestamp to be stored.
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 * The HW event is used also to handle the timer events so that the wrapper class calling the
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 * state machine will handle the starting, canceling etc. of the timers and the state machine
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 * sees the timers as messages.  This hopefully makes it easier to keep the core state machine as
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 * OS agnostic as possible.
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 */
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class QStm_HwEvent
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{
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public:
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    QStm_HwEvent() {} ;
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    QStm_HwEvent(const QStm_HwEvent& ev):
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        m_type(ev.m_type), m_position(ev.m_position),
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        m_time(ev.m_time), m_target(ev.m_target), m_pointerNumber(ev.m_pointerNumber) {}
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    QStm_HwEvent(QStm_StateMachineEvent code, const QPoint& pos, QTime time, void* target, int pointerNr):
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        m_type(code), m_position(pos),
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        m_time(time), m_target(target), m_pointerNumber(pointerNr) {}
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    QStm_StateMachineEvent m_type ;
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    QPoint  m_position ;
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    QTime   m_time ;
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    void*   m_target ;
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	int	    m_pointerNumber ;
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};
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class QStm_StateEngine : public QObject
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{
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public:
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    /**
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     * constructor and destructor
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     */
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	QStm_StateEngine(QStm_StateEngineConfiguration* config, QStm_TimerInterfaceIf* timerif, int index) ;
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    ~QStm_StateEngine() ;
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    /**
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     *  The methods needed for state machine
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     */
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    void consumeEvent() ;
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    bool isTouchTimer() ;
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    bool isHoldTimer() ;
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    bool isSuppressTimer() ;
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    bool isTouchTimeArea() ;
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    bool isTouchArea() ;
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    bool isHoldArea() ;
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    bool insideTouchTimeArea() ;
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    bool insideTouchArea() ;
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    bool insideHoldArea() ;
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    bool looksLikeHold() ;
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    void errorEvent() ;
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    void initTouchTimer() ;
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    void initHoldTimer() ;
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    void restartHoldTimer() ;
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    void initTouchSuppressTimer() ;
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    void initMoveSuppressTimer() ;
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    void clearTouchTimer() ;
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    void clearHoldTimer() ;
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    void clearSuppressTimer() ;
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    void produceTouch() ;
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    void produceMove() ;
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    void produceRelease() ;
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    void produceHold() ;
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    void renameToDrag() ;
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    void prepareTouchTimeArea() ;
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    void prepareTouchArea() ;
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    void prepareHoldArea() ;
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    void setCurrentPos() ;
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    void setGestureStart() ;
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    void addToTouch() ;
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    void addDraggingPos() ;
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    void storeMovePos() ;
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    bool insideMoveThreshold();
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    /**
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     * The event interface
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     */
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    QStm_HwEvent& initEvent()
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    {
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        m_hwe.m_pointerNumber = m_index;
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        return m_hwe;
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    }
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    // event returned by initEvent() must initialized first
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	bool handleStateEvent()  ;
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	QRect getTouchArea() ;
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	QRect getHoldArea() ;
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	bool  wasLastMessageFiltered() ;
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private:
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    bool m_eventConsumed ;
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    QStm_HwEvent m_hwe ;
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    bool isNewHoldingPoint() ;
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    QList<QStm_HwEvent*>  m_dragPoints;        // LATER: change this into std::vector
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    QStm_TimerInterfaceIf*  m_timerif ;                //
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    QList<QStm_HwEvent>   m_touchPoints;      // LATER: change this into std::vector
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    // Variables for running the state machine
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    QStm_StateMachineState m_currentState ;
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    bool m_isTimerEvent ;                   // We need to separate the pointer events and the timer events
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    QPoint m_currentTouchXY ;               // This is the touching point
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    QPoint m_gestureStartXY ;               // gesture started at this point
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    QPoint m_uiEventXY ;                    // The UI event XY point.
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    QPoint m_previousPointerEventPosition ;
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    QPoint m_deltaVector ;
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    QRect m_touchRect ;
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    QRect m_holdRect ;
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    bool m_wasFiltered ;
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    void calculateDelta() ;
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    void calculateTouchAverage() ;
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    void calculateCurrentVector() ;
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    QPoint calculateTouchAverageFromPoints() ;
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    bool insideArea(const QPoint& point, const QRect& rect, QStm_AreaShape shape, const QPoint& tolerance);
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    void setTolerance(long fingersize_mm, QPoint& tolerance, QStm_AreaShape shape) ;
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    void debugPrintState(QStm_StateMachineState nextstate) ;
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    inline static QRect toleranceRect( const QPoint& aCenterPoint, const QPoint& tolerance) ;
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    void turnStateMachine() ;
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    QPoint     m_touchCentre ;
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    QPoint     m_holdCentre ;
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    void*       m_gestureTarget ;
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    long        getInterval() ;
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    QTime       m_lastMessageTime ;
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    QStm_UiEvent* createUIEvent(QStm_UiEventCode code, const QPoint& aPos) ;
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    QPoint getPreviousXY(const QPoint& aXY) ;
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    QPoint m_previousXY ;
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    bool isTimerMessage() ;
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    int  m_index ;
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    // TPoint screenCoordinates(TPoint aPos, void* aGestureTarget) ;
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    QStm_UiEventCode m_previousUiGenerated ;
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    QPoint m_lastFilteredPosition ;
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    QTime m_lastFilteredMessageTime ;
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	QStm_StateEngineConfiguration* m_config ;
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};
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class QStm_UiEventSender: public QObject
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{
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public:
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    enum EventSenderState
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        {
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        ENoEvents,
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        EEventsReady,
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        EBusy
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        };
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    QStm_UiEventSender();
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    ~QStm_UiEventSender();
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    int addEvent(QStm_UiEvent* gestureEvent);
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    bool addObserver(QStm_UiEventObserverIf* observer );
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    bool removeObserver(QStm_UiEventObserverIf* observer );
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    bool isObserver(void* observer );
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    void setLogging(bool a) {m_loggingenabled = a;} ;
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private:
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    void emitEvent( const QStm_UiEvent& gestureEvent );
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    /*!
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     * Should we be prepared for more than 5 pointers ?  Jos tulee Torvisen voittaja
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     */
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    QStm_UiEvent* m_events[qstmUiEventEngine::KMaxNumberOfPointers];
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    void compressStack(QStm_UiEvent* uiEvent) ;
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    /*
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     * Let's be prepared for more than one observer,
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     * although usually there is only the gesture engine
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     */
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    QList<QStm_UiEventObserverIf*> m_observers;
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    bool m_loggingenabled ;
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};
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}   // namespace
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#endif /* QSTMSTATEENGINE_H_ */