qwt_picker_machine.h

/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   Uwe Rathmann
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *****************************************************************************/

#ifndef QWT_PICKER_MACHINE
#define QWT_PICKER_MACHINE 1

#include "qwt_global.h"
#if QT_VERSION < 0x040000
#include <qvaluelist.h>
#else
#include <qlist.h>
#endif

class QEvent;
class QwtEventPattern;

class QWT_EXPORT QwtPickerMachine
{
public:
    enum Command
    {
        Begin,
        Append,
        Move,
        End
    };

#if QT_VERSION < 0x040000
    typedef QValueList<Command> CommandList;
#else
    typedef QList<Command> CommandList;
#endif

    virtual ~QwtPickerMachine();

    virtual CommandList transition(
        const QwtEventPattern &, const QEvent *) = 0;
    void reset(); 

    int state() const;
    void setState(int);

protected:
    QwtPickerMachine();

private:
    int d_state;
};

class QWT_EXPORT QwtPickerClickPointMachine: public QwtPickerMachine
{
public:
    virtual CommandList transition(
        const QwtEventPattern &, const QEvent *);
};

class QWT_EXPORT QwtPickerDragPointMachine: public QwtPickerMachine
{
public:
    virtual CommandList transition(
        const QwtEventPattern &, const QEvent *);
};

class QWT_EXPORT QwtPickerClickRectMachine: public QwtPickerMachine
{
public:
    virtual CommandList transition(
        const QwtEventPattern &, const QEvent *);
};

class QWT_EXPORT QwtPickerDragRectMachine: public QwtPickerMachine
{
public:
    virtual CommandList transition(
        const QwtEventPattern &, const QEvent *);
};

class QWT_EXPORT QwtPickerPolygonMachine: public QwtPickerMachine
{
public:
    virtual CommandList transition(
        const QwtEventPattern &, const QEvent *);
};

#endif

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