1 files changed, 140 insertions, 0 deletions
diff --git a/examples/widgets/state-machine/trafficlight.py b/examples/widgets/state-machine/trafficlight.py
new file mode 100755
index 000000000..8e1d71d94
--- /dev/null
+++ b/examples/widgets/state-machine/trafficlight.py
@@ -0,0 +1,140 @@
+#!/usr/bin/env python
+
+#############################################################################
+##
+## 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 PySide 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 PySide2.QtWidgets import *
+from PySide2.QtGui import *
+from PySide2.QtCore import *
+
+class LightWidget(QWidget):
+    def __init__(self, color):
+        super(LightWidget, self).__init__()
+        self.color = color
+        self.onVal = False
+    def isOn(self):
+        return self.onVal
+    def setOn(self, on):
+        if self.onVal == on:
+            return
+        self.onVal = on
+        self.update()
+    @Slot()
+    def turnOff(self):
+        self.setOn(False)
+    @Slot()
+    def turnOn(self):
+        self.setOn(True)
+    def paintEvent(self, e):
+        if not self.onVal:
+            return
+        painter = QPainter(self)
+        painter.setRenderHint(QPainter.Antialiasing)
+        painter.setBrush(self.color)
+        painter.drawEllipse(0, 0, self.width(), self.height())
+
+    on = Property(bool, isOn, setOn)
+
+class TrafficLightWidget(QWidget):
+    def __init__(self):
+        super(TrafficLightWidget, self).__init__()
+        vbox = QVBoxLayout(self)
+        self.redLight = LightWidget(Qt.red)
+        vbox.addWidget(self.redLight)
+        self.yellowLight = LightWidget(Qt.yellow)
+        vbox.addWidget(self.yellowLight)
+        self.greenLight = LightWidget(Qt.green)
+        vbox.addWidget(self.greenLight)
+        pal = QPalette()
+        pal.setColor(QPalette.Background, Qt.black)
+        self.setPalette(pal)
+        self.setAutoFillBackground(True)
+
+def createLightState(light, duration, parent=None):
+    lightState = QState(parent)
+    timer = QTimer(lightState)
+    timer.setInterval(duration)
+    timer.setSingleShot(True)
+    timing = QState(lightState)
+    timing.entered.connect(light.turnOn)
+    timing.entered.connect(timer.start)
+    timing.exited.connect(light.turnOff)
+    done = QFinalState(lightState)
+    timing.addTransition(timer, SIGNAL('timeout()'), done)
+    lightState.setInitialState(timing)
+    return lightState
+
+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)
+        redGoingYellow = createLightState(widget.redLight, 1000)
+        redGoingYellow.setObjectName('redGoingYellow')
+        yellowGoingGreen = createLightState(widget.redLight, 1000)
+        yellowGoingGreen.setObjectName('redGoingYellow')
+        redGoingYellow.addTransition(redGoingYellow, SIGNAL('finished()'), yellowGoingGreen)
+        greenGoingYellow = createLightState(widget.yellowLight, 3000)
+        greenGoingYellow.setObjectName('redGoingYellow')
+        yellowGoingGreen.addTransition(yellowGoingGreen, SIGNAL('finished()'), greenGoingYellow)
+        yellowGoingRed = createLightState(widget.greenLight, 1000)
+        yellowGoingRed.setObjectName('redGoingYellow')
+        greenGoingYellow.addTransition(greenGoingYellow, SIGNAL('finished()'), yellowGoingRed)
+        yellowGoingRed.addTransition(yellowGoingRed, SIGNAL('finished()'), redGoingYellow)
+
+        machine.addState(redGoingYellow)
+        machine.addState(yellowGoingGreen)
+        machine.addState(greenGoingYellow)
+        machine.addState(yellowGoingRed)
+        machine.setInitialState(redGoingYellow)
+        machine.start()
+
+if __name__ == '__main__':
+    import sys
+    app = QApplication(sys.argv)
+    widget = TrafficLight()
+    widget.resize(110, 300)
+    widget.show()
+    sys.exit(app.exec_())