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Diffstat (limited to 'examples/widgets/state-machine/factstates/factstates.py')
-rw-r--r-- | examples/widgets/state-machine/factstates/factstates.py | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/examples/widgets/state-machine/factstates/factstates.py b/examples/widgets/state-machine/factstates/factstates.py new file mode 100644 index 000000000..3608f2a49 --- /dev/null +++ b/examples/widgets/state-machine/factstates/factstates.py @@ -0,0 +1,114 @@ + +############################################################################# +## +## 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): + xChanged = Signal(int) + def __init__(self): + super(Factorial, self).__init__() + self.xval = -1 + self.facval = 1 + def getX(self): + return self.xval + def setX(self, x): + if self.xval == x: + return + self.xval = x + self.xChanged.emit(x) + x = Property(int, getX, setX) + def getFact(self): + return self.facval + def setFact(self, fac): + self.facval = fac + fac = Property(int, getFact, setFact) + +class FactorialLoopTransition(QSignalTransition): + def __init__(self, fact): + super(FactorialLoopTransition, self).__init__(fact, SIGNAL('xChanged(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(FactorialDoneTransition, self).__init__(fact, SIGNAL('xChanged(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) + doneTransition = FactorialDoneTransition(factorial) + doneTransition.setTargetState(done) + compute.addTransition(doneTransition) + + machine.setInitialState(compute) + machine.finished.connect(app.quit) + machine.start() + + sys.exit(app.exec_()) |