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
|
#############################################################################
##
## Copyright (C) 2010 velociraptor Genjix <aphidia@hotmail.com>
## Copyright (C) 2021 The Qt Company Ltd.
## Contact: http://www.qt.io/licensing/
##
## This file is part of the Qt for Python examples of the Qt Toolkit.
##
## $QT_BEGIN_LICENSE:BSD$
## You may use this file under the terms of the BSD license as follows:
##
## "Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are
## met:
## * Redistributions of source code must retain the above copyright
## notice, this list of conditions and the following disclaimer.
## * Redistributions in binary form must reproduce the above copyright
## notice, this list of conditions and the following disclaimer in
## the documentation and/or other materials provided with the
## distribution.
## * Neither the name of The Qt Company Ltd nor the names of its
## contributors may be used to endorse or promote products derived
## from this software without specific prior written permission.
##
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
##
## $QT_END_LICENSE$
##
#############################################################################
from PySide6.QtWidgets import *
from PySide6.QtCore import *
from PySide6.QtStateMachine import (QFinalState, QSignalTransition, QState,
QStateMachine)
class Factorial(QObject):
x_changed = Signal(int)
def __init__(self):
super().__init__()
self.xval = -1
self.facval = 1
def get_x(self):
return self.xval
def set_x(self, x):
if self.xval == x:
return
self.xval = x
self.x_changed.emit(x)
x = Property(int, get_x, set_x)
def get_fact(self):
return self.facval
def set_fact(self, fac):
self.facval = fac
fac = Property(int, get_fact, set_fact)
class FactorialLoopTransition(QSignalTransition):
def __init__(self, fact):
super().__init__(fact, SIGNAL('x_changed(int)'))
self.fact = fact
def eventTest(self, e):
if not super(FactorialLoopTransition, self).eventTest(e):
return False
return e.arguments()[0] > 1
def onTransition(self, e):
x = e.arguments()[0]
fac = self.fact.fac
self.fact.fac = x * fac
self.fact.x = x - 1
class FactorialDoneTransition(QSignalTransition):
def __init__(self, fact):
super().__init__(fact, SIGNAL('x_changed(int)'))
self.fact = fact
def eventTest(self, e):
if not super(FactorialDoneTransition, self).eventTest(e):
return False
return e.arguments()[0] <= 1
def onTransition(self, e):
print(self.fact.fac)
if __name__ == '__main__':
import sys
app = QCoreApplication(sys.argv)
factorial = Factorial()
machine = QStateMachine()
compute = QState(machine)
compute.assignProperty(factorial, 'fac', 1)
compute.assignProperty(factorial, 'x', 6)
compute.addTransition(FactorialLoopTransition(factorial))
done = QFinalState(machine)
done_transition = FactorialDoneTransition(factorial)
done_transition.setTargetState(done)
compute.addTransition(done_transition)
machine.setInitialState(compute)
machine.finished.connect(app.quit)
machine.start()
sys.exit(app.exec())
|
