qwt_picker_machine.h

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/******************************************************************************
 * 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
 
#include "qwt_global.h"
 
class QwtEventPattern;
class QEvent;
template< typename T > class QList;
 
class QWT_EXPORT QwtPickerMachine
{
  public:
    enum SelectionType
    {
        NoSelection = -1,
 
        PointSelection,
 
        RectSelection,
 
        PolygonSelection
    };
 
    enum Command
    {
        Begin,
        Append,
        Move,
        Remove,
        End
    };
 
    explicit QwtPickerMachine( SelectionType );
    virtual ~QwtPickerMachine();
 
    virtual QList< Command > transition(
        const QwtEventPattern&, const QEvent* ) = 0;
    void reset();
 
    int state() const;
    void setState( int );
 
    SelectionType selectionType() const;
 
  private:
    const SelectionType m_selectionType;
    int m_state;
};
 
class QWT_EXPORT QwtPickerTrackerMachine : public QwtPickerMachine
{
  public:
    QwtPickerTrackerMachine();
 
    virtual QList< Command > transition(
        const QwtEventPattern&, const QEvent* ) QWT_OVERRIDE;
};
 
class QWT_EXPORT QwtPickerClickPointMachine : public QwtPickerMachine
{
  public:
    QwtPickerClickPointMachine();
 
    virtual QList< Command > transition(
        const QwtEventPattern&, const QEvent* ) QWT_OVERRIDE;
};
 
class QWT_EXPORT QwtPickerDragPointMachine : public QwtPickerMachine
{
  public:
    QwtPickerDragPointMachine();
 
    virtual QList< Command > transition(
        const QwtEventPattern&, const QEvent* ) QWT_OVERRIDE;
};
 
class QWT_EXPORT QwtPickerClickRectMachine : public QwtPickerMachine
{
  public:
    QwtPickerClickRectMachine();
 
    virtual QList< Command > transition(
        const QwtEventPattern&, const QEvent* ) QWT_OVERRIDE;
};
 
class QWT_EXPORT QwtPickerDragRectMachine : public QwtPickerMachine
{
  public:
    QwtPickerDragRectMachine();
 
    virtual QList< Command > transition(
        const QwtEventPattern&, const QEvent* ) QWT_OVERRIDE;
};
 
class QWT_EXPORT QwtPickerDragLineMachine : public QwtPickerMachine
{
  public:
    QwtPickerDragLineMachine();
 
    virtual QList< Command > transition(
        const QwtEventPattern&, const QEvent* ) QWT_OVERRIDE;
};
 
class QWT_EXPORT QwtPickerPolygonMachine : public QwtPickerMachine
{
  public:
    QwtPickerPolygonMachine();
 
    virtual QList< Command > transition(
        const QwtEventPattern&, const QEvent* ) QWT_OVERRIDE;
};
 
#endif