/****************************************************************************
**
** Copyright (C) 2011 Digia Plc
** All rights reserved.
** For any questions to Digia, please use contact form at http://qt.digia.com
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE$
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the 
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  
**
** If you have questions regarding the use of this file, please use
** contact form at http://qt.digia.com
** $QT_END_LICENSE$
** 
** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
**
****************************************************************************/

#ifndef QABSTRACTSTATE_H
#define QABSTRACTSTATE_H

#include <QtCore/qobject.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Core)

#ifndef QT_NO_STATEMACHINE

class QState;
class QStateMachine;

class QAbstractStatePrivate;
class Q_CORE_EXPORT QAbstractState : public QObject
{
    Q_OBJECT
public:
    ~QAbstractState();

    QState *parentState() const;
    QStateMachine *machine() const;

Q_SIGNALS:
#if !defined(Q_MOC_RUN) && !defined(qdoc)
private: // can only be emitted by QAbstractState
#endif
    void entered();
    void exited();

protected:
    QAbstractState(QState *parent = 0);

    virtual void onEntry(QEvent *event) = 0;
    virtual void onExit(QEvent *event) = 0;

    bool event(QEvent *e);

protected:
    QAbstractState(QAbstractStatePrivate &dd, QState *parent);

private:
    Q_DISABLE_COPY(QAbstractState)
    Q_DECLARE_PRIVATE(QAbstractState)
};

#endif //QT_NO_STATEMACHINE

QT_END_NAMESPACE

QT_END_HEADER

#endif
