1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
* Qwt Widget Library
* Copyright (C) 1997 Josef Wilgen
* Copyright (C) 2002 Uwe Rathmann
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the Qwt License, Version 1.0
*****************************************************************************/
#ifndef QWT_PICKER_MACHINE
#define QWT_PICKER_MACHINE 1
#include "qwt_global.h"
#include <qlist.h>
class QEvent;
class QwtEventPattern;
/*!
\brief A state machine for QwtPicker selections
QwtPickerMachine accepts key and mouse events and translates them
into selection commands.
\sa QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode
*/
class QWT_EXPORT QwtPickerMachine
{
public:
/*!
Type of a selection.
\sa selectionType()
*/
enum SelectionType
{
//! The state machine not usable for any type of selection.
NoSelection = -1,
//! The state machine is for selecting a single point.
PointSelection,
//! The state machine is for selecting a rectangle (2 points).
RectSelection,
//! The state machine is for selecting a polygon (many points).
PolygonSelection
};
//! Commands - the output of a state machine
enum Command
{
Begin,
Append,
Move,
Remove,
End
};
QwtPickerMachine( SelectionType );
virtual ~QwtPickerMachine();
//! Transition
virtual QList<Command> transition(
const QwtEventPattern &, const QEvent * ) = 0;
void reset();
int state() const;
void setState( int );
SelectionType selectionType() const;
private:
const SelectionType d_selectionType;
int d_state;
};
/*!
\brief A state machine for indicating mouse movements
QwtPickerTrackerMachine supports displaying information
corresponding to mouse movements, but is not intended for
selecting anything. Begin/End are related to Enter/Leave events.
*/
class QWT_EXPORT QwtPickerTrackerMachine: public QwtPickerMachine
{
public:
QwtPickerTrackerMachine();
virtual QList<Command> transition(
const QwtEventPattern &, const QEvent * );
};
/*!
\brief A state machine for point selections
Pressing QwtEventPattern::MouseSelect1 or
QwtEventPattern::KeySelect1 selects a point.
\sa QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode
*/
class QWT_EXPORT QwtPickerClickPointMachine: public QwtPickerMachine
{
public:
QwtPickerClickPointMachine();
virtual QList<Command> transition(
const QwtEventPattern &, const QEvent * );
};
/*!
\brief A state machine for point selections
Pressing QwtEventPattern::MouseSelect1 or QwtEventPattern::KeySelect1
starts the selection, releasing QwtEventPattern::MouseSelect1 or
a second press of QwtEventPattern::KeySelect1 terminates it.
*/
class QWT_EXPORT QwtPickerDragPointMachine: public QwtPickerMachine
{
public:
QwtPickerDragPointMachine();
virtual QList<Command> transition(
const QwtEventPattern &, const QEvent * );
};
/*!
\brief A state machine for rectangle selections
Pressing QwtEventPattern::MouseSelect1 starts
the selection, releasing it selects the first point. Pressing it
again selects the second point and terminates the selection.
Pressing QwtEventPattern::KeySelect1 also starts the
selection, a second press selects the first point. A third one selects
the second point and terminates the selection.
\sa QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode
*/
class QWT_EXPORT QwtPickerClickRectMachine: public QwtPickerMachine
{
public:
QwtPickerClickRectMachine();
virtual QList<Command> transition(
const QwtEventPattern &, const QEvent * );
};
/*!
\brief A state machine for rectangle selections
Pressing QwtEventPattern::MouseSelect1 selects
the first point, releasing it the second point.
Pressing QwtEventPattern::KeySelect1 also selects the
first point, a second press selects the second point and terminates
the selection.
\sa QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode
*/
class QWT_EXPORT QwtPickerDragRectMachine: public QwtPickerMachine
{
public:
QwtPickerDragRectMachine();
virtual QList<Command> transition(
const QwtEventPattern &, const QEvent * );
};
/*!
\brief A state machine for polygon selections
Pressing QwtEventPattern::MouseSelect1 or QwtEventPattern::KeySelect1
starts the selection and selects the first point, or appends a point.
Pressing QwtEventPattern::MouseSelect2 or QwtEventPattern::KeySelect2
appends the last point and terminates the selection.
\sa QwtEventPattern::MousePatternCode, QwtEventPattern::KeyPatternCode
*/
class QWT_EXPORT QwtPickerPolygonMachine: public QwtPickerMachine
{
public:
QwtPickerPolygonMachine();
virtual QList<Command> transition(
const QwtEventPattern &, const QEvent * );
};
#endif
|
