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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