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
|
#############################################################################
##
## Copyright (C) 2010 velociraptor Genjix <aphidia@hotmail.com>
## Copyright (C) 2016 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.QtGui import *
from PySide6.QtCore import *
from PySide6.QtStateMachine import QFinalState, QState, QStateMachine
class LightWidget(QWidget):
def __init__(self, color):
super(LightWidget, self).__init__()
self.color = color
self._on_val = False
def is_on(self):
return self._on_val
def set_on(self, on):
if self._on_val == on:
return
self._on_val = on
self.update()
@Slot()
def turn_off(self):
self.set_on(False)
@Slot()
def turn_on(self):
self.set_on(True)
def paintEvent(self, e):
if not self._on_val:
return
painter = QPainter(self)
painter.setRenderHint(QPainter.Antialiasing)
painter.setBrush(self.color)
painter.drawEllipse(0, 0, self.width(), self.height())
on = Property(bool, is_on, set_on)
class TrafficLightWidget(QWidget):
def __init__(self):
super(TrafficLightWidget, self).__init__()
vbox = QVBoxLayout(self)
self._red_light = LightWidget(Qt.red)
vbox.addWidget(self._red_light)
self._yellow_light = LightWidget(Qt.yellow)
vbox.addWidget(self._yellow_light)
self._green_light = LightWidget(Qt.green)
vbox.addWidget(self._green_light)
pal = QPalette()
pal.setColor(QPalette.Window, Qt.black)
self.setPalette(pal)
self.setAutoFillBackground(True)
def create_light_state(light, duration, parent=None):
light_state = QState(parent)
timer = QTimer(light_state)
timer.setInterval(duration)
timer.setSingleShot(True)
timing = QState(light_state)
timing.entered.connect(light.turn_on)
timing.entered.connect(timer.start)
timing.exited.connect(light.turn_off)
done = QFinalState(light_state)
timing.addTransition(timer, SIGNAL('timeout()'), done)
light_state.setInitialState(timing)
return light_state
class TrafficLight(QWidget):
def __init__(self):
super(TrafficLight, self).__init__()
vbox = QVBoxLayout(self)
widget = TrafficLightWidget()
vbox.addWidget(widget)
vbox.setContentsMargins(0, 0, 0, 0)
machine = QStateMachine(self)
red_going_yellow = create_light_state(widget._red_light, 1000)
red_going_yellow.setObjectName('redGoingYellow')
yellow_going_green = create_light_state(widget._red_light, 1000)
yellow_going_green.setObjectName('redGoingYellow')
red_going_yellow.addTransition(red_going_yellow, SIGNAL('finished()'), yellow_going_green)
green_going_yellow = create_light_state(widget._yellow_light, 3000)
green_going_yellow.setObjectName('redGoingYellow')
yellow_going_green.addTransition(yellow_going_green, SIGNAL('finished()'), green_going_yellow)
yellow_going_red = create_light_state(widget._green_light, 1000)
yellow_going_red.setObjectName('redGoingYellow')
green_going_yellow.addTransition(green_going_yellow, SIGNAL('finished()'), yellow_going_red)
yellow_going_red.addTransition(yellow_going_red, SIGNAL('finished()'), red_going_yellow)
machine.addState(red_going_yellow)
machine.addState(yellow_going_green)
machine.addState(green_going_yellow)
machine.addState(yellow_going_red)
machine.setInitialState(red_going_yellow)
machine.start()
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
widget = TrafficLight()
widget.resize(110, 300)
widget.show()
sys.exit(app.exec_())
|
