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/* -*- 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 <qvaluelist.h>
#include "qwt_array.h"
class QEvent;
class QwtEventPattern;
/*!
\brief A state machine for QwtPicker selections
QwtPickerMachine accepts key and mouse events and translates them
into selection commands.
\sa QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode
*/
class QWT_EXPORT QwtPickerMachine
{
public:
enum Command
{
Begin,
Append,
Move,
End
};
virtual ~QwtPickerMachine();
//! Transition
virtual QValueList<Command> transition(
const QwtEventPattern &, const QEvent *) = 0;
void reset();
protected:
QwtPickerMachine();
int state() const;
void setState(int);
private:
int d_state;
};
/*!
\brief A state machine for point selections
Pressing QwtEventPattern::MouseSelect1 or
QwtEventPattern::KeySelect1 selects a point.
\sa QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode
*/
class QWT_EXPORT QwtPickerClickPointMachine: public QwtPickerMachine
{
public:
virtual QValueList<Command> transition(
const QwtEventPattern &, const QEvent *);
};
/*!
\brief A state machine for point selections
Pressing QwtEventPattern::MouseSelect1 or QwtEventPattern::KeySelect1
starts the selection, releasing QwtEventPattern::MouseSelect1 or
a second press of QwtEventPattern::KeySelect1 terminates it.
*/
class QWT_EXPORT QwtPickerDragPointMachine: public QwtPickerMachine
{
public:
virtual QValueList<Command> transition(
const QwtEventPattern &, const QEvent *);
};
/*!
\brief A state machine for rectangle selections
Pressing QwtEventPattern::MouseSelect1 starts
the selection, releasing it selects the first point. Pressing it
again selects the second point and terminates the selection.
Pressing QwtEventPattern::KeySelect1 also starts the
selection, a second press selects the first point. A third one selects
the second point and terminates the selection.
\sa QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode
*/
class QWT_EXPORT QwtPickerClickRectMachine: public QwtPickerMachine
{
public:
virtual QValueList<Command> transition(
const QwtEventPattern &, const QEvent *);
};
/*!
\brief A state machine for rectangle selections
Pressing QwtEventPattern::MouseSelect1 selects
the first point, releasing it the second point.
Pressing QwtEventPattern::KeySelect1 also selects the
first point, a second press selects the second point and terminates
the selection.
\sa QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode
*/
class QWT_EXPORT QwtPickerDragRectMachine: public QwtPickerMachine
{
public:
virtual QValueList<Command> transition(
const QwtEventPattern &, const QEvent *);
};
/*!
\brief A state machine for polygon selections
Pressing QwtEventPattern::MouseSelect1 or QwtEventPattern::KeySelect1
starts the selection and selects the first point, or appends a point.
Pressing QwtEventPattern::MouseSelect2 or QwtEventPattern::KeySelect2
appends the last point and terminates the selection.
\sa QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode
*/
class QWT_EXPORT QwtPickerPolygonMachine: public QwtPickerMachine
{
public:
virtual QValueList<Command> transition(
const QwtEventPattern &, const QEvent *);
};
#endif
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