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qwt_picker_machine.h

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 <qvaluelist.h>
00014 #include "qwt_array.h"
00015 
00016 class QEvent;
00017 class QwtEventPattern;
00018 
00028 class QWT_EXPORT QwtPickerMachine
00029 {
00030 public:
00031     enum Command
00032     {
00033         Begin,
00034         Append,
00035         Move,
00036         End
00037     };
00038 
00039     virtual ~QwtPickerMachine();
00040 
00042     virtual QValueList<Command> transition(
00043         const QwtEventPattern &, const QEvent *) = 0;
00044     void reset(); 
00045 
00046 protected:
00047     QwtPickerMachine();
00048 
00049     int state() const;
00050     void setState(int);
00051 
00052 private:
00053     int d_state;
00054 };
00055 
00064 class QWT_EXPORT QwtPickerClickPointMachine: public QwtPickerMachine
00065 {
00066 public:
00067     virtual QValueList<Command> transition(
00068         const QwtEventPattern &, const QEvent *);
00069 };
00070 
00078 class QWT_EXPORT QwtPickerDragPointMachine: public QwtPickerMachine
00079 {
00080 public:
00081     virtual QValueList<Command> transition(
00082         const QwtEventPattern &, const QEvent *);
00083 };
00084 
00098 class QWT_EXPORT QwtPickerClickRectMachine: public QwtPickerMachine
00099 {
00100 public:
00101     virtual QValueList<Command> transition(
00102         const QwtEventPattern &, const QEvent *);
00103 };
00104 
00117 class QWT_EXPORT QwtPickerDragRectMachine: public QwtPickerMachine
00118 {
00119 public:
00120     virtual QValueList<Command> transition(
00121         const QwtEventPattern &, const QEvent *);
00122 };
00123 
00135 class QWT_EXPORT QwtPickerPolygonMachine: public QwtPickerMachine
00136 {
00137 public:
00138     virtual QValueList<Command> transition(
00139         const QwtEventPattern &, const QEvent *);
00140 };
00141 
00142 #endif

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