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
|
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the $MODULE$ of the Qt Toolkit.
**
** $TROLLTECH_DUAL_LICENSE$
**
****************************************************************************/
#include <QtCore>
#include <stdio.h>
#ifdef QT_STATEMACHINE_SOLUTION
#include <qstatemachine.h>
#include <qstate.h>
#include <qsignaltransition.h>
#include <qfinalstate.h>
#endif
class Factorial : public QObject
{
Q_OBJECT
Q_PROPERTY(int x READ x WRITE setX)
Q_PROPERTY(int fac READ fac WRITE setFac)
public:
Factorial(QObject *parent = 0)
: QObject(parent)
{
m_fac = 1;
m_x = -1;
}
int x() const
{
return m_x;
}
void setX(int x)
{
if (x == m_x)
return;
m_x = x;
emit xChanged();
}
int fac() const
{
return m_fac;
}
void setFac(int fac)
{
m_fac = fac;
}
Q_SIGNALS:
void xChanged();
private:
int m_x;
int m_fac;
};
class FactorialLoopTransition : public QSignalTransition
{
public:
FactorialLoopTransition(Factorial *fact)
: QSignalTransition(fact, SIGNAL(xChanged())), m_fact(fact)
{}
virtual bool eventTest(QEvent *) const
{
return m_fact->property("x").toInt() > 1;
}
virtual void onTransition()
{
int x = m_fact->property("x").toInt();
int fac = m_fact->property("fac").toInt();
m_fact->setProperty("fac", x * fac);
m_fact->setProperty("x", x - 1);
}
private:
Factorial *m_fact;
};
class FactorialDoneTransition : public QSignalTransition
{
public:
FactorialDoneTransition(Factorial *fact)
: QSignalTransition(fact, SIGNAL(xChanged())), m_fact(fact)
{}
virtual bool eventTest(QEvent *) const
{
return m_fact->property("x").toInt() <= 1;
}
virtual void onTransition()
{
fprintf(stdout, "%d\n", m_fact->property("fac").toInt());
}
private:
Factorial *m_fact;
};
int main(int argc, char **argv)
{
QCoreApplication app(argc, argv);
Factorial factorial;
QStateMachine machine;
QState *computing = new QState(machine.rootState());
computing->addTransition(new FactorialLoopTransition(&factorial));
QFinalState *done = new QFinalState(machine.rootState());
FactorialDoneTransition *doneTransition = new FactorialDoneTransition(&factorial);
doneTransition->setTargetState(done);
computing->addTransition(doneTransition);
QState *initialize = new QState(machine.rootState());
initialize->setPropertyOnEntry(&factorial, "x", 6);
FactorialLoopTransition *enterLoopTransition = new FactorialLoopTransition(&factorial);
enterLoopTransition->setTargetState(computing);
initialize->addTransition(enterLoopTransition);
QObject::connect(&machine, SIGNAL(finished()), &app, SLOT(quit()));
machine.setInitialState(initialize);
machine.start();
return app.exec();
}
#include "main.moc"
|
