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_())