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src/qwt/src/qwt_picker_machine.h
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00001 /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
00002  * Qwt Widget Library
00003  * Copyright (C) 1997   Josef Wilgen
00004  * Copyright (C) 2002   Uwe Rathmann
00005  * 
00006  * This library is free software; you can redistribute it and/or
00007  * modify it under the terms of the Qwt License, Version 1.0
00008  *****************************************************************************/
00009 
00010 #ifndef QWT_PICKER_MACHINE
00011 #define QWT_PICKER_MACHINE 1
00012 
00013 #include "qwt_global.h"
00014 #if QT_VERSION < 0x040000
00015 #include <qvaluelist.h>
00016 #else
00017 #include <qlist.h>
00018 #endif
00019 
00020 class QEvent;
00021 class QwtEventPattern;
00022 
00032 class QWT_EXPORT QwtPickerMachine
00033 {
00034 public:
00036     enum Command
00037     {
00038         Begin,
00039         Append,
00040         Move,
00041         End
00042     };
00043 
00044 #if QT_VERSION < 0x040000
00045     typedef QValueList<Command> CommandList;
00046 #else
00047     typedef QList<Command> CommandList;
00048 #endif
00049 
00050     virtual ~QwtPickerMachine();
00051 
00053     virtual CommandList transition(
00054         const QwtEventPattern &, const QEvent *) = 0;
00055     void reset(); 
00056 
00057     int state() const;
00058     void setState(int);
00059 
00060 protected:
00061     QwtPickerMachine();
00062 
00063 private:
00064     int d_state;
00065 };
00066 
00075 class QWT_EXPORT QwtPickerClickPointMachine: public QwtPickerMachine
00076 {
00077 public:
00078     virtual CommandList transition(
00079         const QwtEventPattern &, const QEvent *);
00080 };
00081 
00089 class QWT_EXPORT QwtPickerDragPointMachine: public QwtPickerMachine
00090 {
00091 public:
00092     virtual CommandList transition(
00093         const QwtEventPattern &, const QEvent *);
00094 };
00095 
00109 class QWT_EXPORT QwtPickerClickRectMachine: public QwtPickerMachine
00110 {
00111 public:
00112     virtual CommandList transition(
00113         const QwtEventPattern &, const QEvent *);
00114 };
00115 
00128 class QWT_EXPORT QwtPickerDragRectMachine: public QwtPickerMachine
00129 {
00130 public:
00131     virtual CommandList transition(
00132         const QwtEventPattern &, const QEvent *);
00133 };
00134 
00146 class QWT_EXPORT QwtPickerPolygonMachine: public QwtPickerMachine
00147 {
00148 public:
00149     virtual CommandList transition(
00150         const QwtEventPattern &, const QEvent *);
00151 };
00152 
00153 #endif
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