1 files changed, 89 insertions, 0 deletions
diff --git a/examples/statemachine/factstates/factstates.py b/examples/statemachine/factstates/factstates.py
new file mode 100644
index 000000000..aacf8f19b
--- /dev/null
+++ b/examples/statemachine/factstates/factstates.py
@@ -0,0 +1,89 @@
+# Copyright (C) 2010 velociraptor Genjix <[email protected]>
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+import sys
+
+from PySide6.QtCore import QCoreApplication, QObject, Qt, Property, Signal
+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.x_changed)
+        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.x_changed)
+        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__':
+    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())