Qwt User's Guide 6.0.2

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qwt_picker_machine.h
1 /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
2 * Qwt Widget Library
3 * Copyright (C) 1997 Josef Wilgen
4 * Copyright (C) 2002 Uwe Rathmann
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the Qwt License, Version 1.0
8 *****************************************************************************/
9
10 #ifndef QWT_PICKER_MACHINE
11 #define QWT_PICKER_MACHINE 1
12
13 #include "qwt_global.h"
14 #include <qlist.h>
15
16 class QEvent;
17 class QwtEventPattern;
18
28 class QWT_EXPORT QwtPickerMachine
29 {
30 public:
35 enum SelectionType
36 {
38 NoSelection = -1,
39
41 PointSelection,
42
44 RectSelection,
45
47 PolygonSelection
48 };
49
51 enum Command
52 {
53 Begin,
54 Append,
55 Move,
56 Remove,
57 End
58 };
59
60 QwtPickerMachine( SelectionType );
61 virtual ~QwtPickerMachine();
62
64 virtual QList<Command> transition(
65 const QwtEventPattern &, const QEvent * ) = 0;
66 void reset();
67
68 int state() const;
69 void setState( int );
70
71 SelectionType selectionType() const;
72
73 private:
74 const SelectionType d_selectionType;
75 int d_state;
76 };
77
85 class QWT_EXPORT QwtPickerTrackerMachine: public QwtPickerMachine
86 {
87 public:
88 QwtPickerTrackerMachine();
89
90 virtual QList<Command> transition(
91 const QwtEventPattern &, const QEvent * );
92 };
93
102 class QWT_EXPORT QwtPickerClickPointMachine: public QwtPickerMachine
103 {
104 public:
105 QwtPickerClickPointMachine();
106
107 virtual QList<Command> transition(
108 const QwtEventPattern &, const QEvent * );
109 };
110
118 class QWT_EXPORT QwtPickerDragPointMachine: public QwtPickerMachine
119 {
120 public:
121 QwtPickerDragPointMachine();
122
123 virtual QList<Command> transition(
124 const QwtEventPattern &, const QEvent * );
125 };
126
140 class QWT_EXPORT QwtPickerClickRectMachine: public QwtPickerMachine
141 {
142 public:
143 QwtPickerClickRectMachine();
144
145 virtual QList<Command> transition(
146 const QwtEventPattern &, const QEvent * );
147 };
148
161 class QWT_EXPORT QwtPickerDragRectMachine: public QwtPickerMachine
162 {
163 public:
164 QwtPickerDragRectMachine();
165
166 virtual QList<Command> transition(
167 const QwtEventPattern &, const QEvent * );
168 };
169
181 class QWT_EXPORT QwtPickerPolygonMachine: public QwtPickerMachine
182 {
183 public:
184 QwtPickerPolygonMachine();
185
186 virtual QList<Command> transition(
187 const QwtEventPattern &, const QEvent * );
188 };
189
190 #endif