[89] | 1 | /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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| 2 | * Qwt Widget Library
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| 3 | * Copyright (C) 1997 Josef Wilgen
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| 4 | * Copyright (C) 2002 Uwe Rathmann
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| 5 | *
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| 6 | * This library is free software; you can redistribute it and/or
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| 7 | * modify it under the terms of the Qwt License, Version 1.0
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| 8 | *****************************************************************************/
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| 9 |
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| 10 | #ifndef QWT_PICKER_MACHINE
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| 11 | #define QWT_PICKER_MACHINE 1
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| 12 |
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| 13 | #include "qwt_global.h"
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| 14 | #if QT_VERSION < 0x040000
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| 15 | #include <qvaluelist.h>
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| 16 | #else
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| 17 | #include <qlist.h>
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| 18 | #endif
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| 19 |
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| 20 | class QEvent;
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| 21 | class QwtEventPattern;
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| 22 |
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| 23 | /*!
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| 24 | \brief A state machine for QwtPicker selections
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| 25 |
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| 26 | QwtPickerMachine accepts key and mouse events and translates them
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| 27 | into selection commands.
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| 28 |
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| 29 | \sa QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode
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| 30 | */
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| 31 |
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| 32 | class QWT_EXPORT QwtPickerMachine
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| 33 | {
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| 34 | public:
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| 35 | //! Commands - the output of the state machine
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| 36 | enum Command
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| 37 | {
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| 38 | Begin,
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| 39 | Append,
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| 40 | Move,
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| 41 | End
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| 42 | };
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| 43 |
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| 44 | #if QT_VERSION < 0x040000
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| 45 | typedef QValueList<Command> CommandList;
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| 46 | #else
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| 47 | typedef QList<Command> CommandList;
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| 48 | #endif
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| 49 |
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| 50 | virtual ~QwtPickerMachine();
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| 51 |
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| 52 | //! Transition
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| 53 | virtual CommandList transition(
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| 54 | const QwtEventPattern &, const QEvent *) = 0;
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| 55 | void reset();
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| 56 |
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| 57 | int state() const;
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| 58 | void setState(int);
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| 59 |
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| 60 | protected:
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| 61 | QwtPickerMachine();
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| 62 |
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| 63 | private:
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| 64 | int d_state;
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| 65 | };
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| 66 |
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| 67 | /*!
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| 68 | \brief A state machine for point selections
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| 69 |
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| 70 | Pressing QwtEventPattern::MouseSelect1 or
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| 71 | QwtEventPattern::KeySelect1 selects a point.
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| 72 |
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| 73 | \sa QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode
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| 74 | */
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| 75 | class QWT_EXPORT QwtPickerClickPointMachine: public QwtPickerMachine
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| 76 | {
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| 77 | public:
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| 78 | virtual CommandList transition(
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| 79 | const QwtEventPattern &, const QEvent *);
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| 80 | };
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| 81 |
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| 82 | /*!
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| 83 | \brief A state machine for point selections
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| 84 |
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| 85 | Pressing QwtEventPattern::MouseSelect1 or QwtEventPattern::KeySelect1
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| 86 | starts the selection, releasing QwtEventPattern::MouseSelect1 or
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| 87 | a second press of QwtEventPattern::KeySelect1 terminates it.
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| 88 | */
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| 89 | class QWT_EXPORT QwtPickerDragPointMachine: public QwtPickerMachine
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| 90 | {
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| 91 | public:
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| 92 | virtual CommandList transition(
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| 93 | const QwtEventPattern &, const QEvent *);
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| 94 | };
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| 95 |
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| 96 | /*!
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| 97 | \brief A state machine for rectangle selections
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| 98 |
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| 99 | Pressing QwtEventPattern::MouseSelect1 starts
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| 100 | the selection, releasing it selects the first point. Pressing it
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| 101 | again selects the second point and terminates the selection.
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| 102 | Pressing QwtEventPattern::KeySelect1 also starts the
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| 103 | selection, a second press selects the first point. A third one selects
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| 104 | the second point and terminates the selection.
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| 105 |
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| 106 | \sa QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode
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| 107 | */
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| 108 |
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| 109 | class QWT_EXPORT QwtPickerClickRectMachine: public QwtPickerMachine
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| 110 | {
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| 111 | public:
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| 112 | virtual CommandList transition(
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| 113 | const QwtEventPattern &, const QEvent *);
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| 114 | };
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| 115 |
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| 116 | /*!
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| 117 | \brief A state machine for rectangle selections
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| 118 |
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| 119 | Pressing QwtEventPattern::MouseSelect1 selects
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| 120 | the first point, releasing it the second point.
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| 121 | Pressing QwtEventPattern::KeySelect1 also selects the
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| 122 | first point, a second press selects the second point and terminates
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| 123 | the selection.
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| 124 |
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| 125 | \sa QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode
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| 126 | */
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| 127 |
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| 128 | class QWT_EXPORT QwtPickerDragRectMachine: public QwtPickerMachine
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| 129 | {
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| 130 | public:
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| 131 | virtual CommandList transition(
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| 132 | const QwtEventPattern &, const QEvent *);
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| 133 | };
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| 134 |
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| 135 | /*!
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| 136 | \brief A state machine for polygon selections
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| 137 |
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| 138 | Pressing QwtEventPattern::MouseSelect1 or QwtEventPattern::KeySelect1
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| 139 | starts the selection and selects the first point, or appends a point.
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| 140 | Pressing QwtEventPattern::MouseSelect2 or QwtEventPattern::KeySelect2
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| 141 | appends the last point and terminates the selection.
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| 142 |
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| 143 | \sa QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode
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| 144 | */
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| 145 |
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| 146 | class QWT_EXPORT QwtPickerPolygonMachine: public QwtPickerMachine
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| 147 | {
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| 148 | public:
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| 149 | virtual CommandList transition(
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| 150 | const QwtEventPattern &, const QEvent *);
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| 151 | };
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| 152 |
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| 153 | #endif
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