Problem with QScxmlStateMachine and boolean data type in SCXML transition condition

Mr_Gruber

Hi,

i have the problem that if there is a boolean data type in the condition part of the scxml file, the QScxmlStateMachine::submitEvent(const QString &eventName, const QVariant &data) function does not work as i expect.

This is my simple scxml file

<?xml version="1.0" encoding="UTF-8"?>
<scxml xmlns="http://www.w3.org/2005/07/scxml" version="1.0" datamodel="ecmascript" name="default" initial="ViewA">
    <state id="MainWindow">
        <state id="ViewA">
            <transition event="switch1" cond="_event.data == true" target="ViewB"/>
            <transition event="switch1" cond="_event.data == false" target="ViewC"/>
        </state>
        <state id="ViewB">
            <transition event="switch2" cond="_event.data == false" target="ViewA"/>
            <transition event="switch2" cond="_event.data == true" target="ViewC"/>
        </state>
        <state id="ViewC">
            <transition event="switch3" cond="_event.data == true" target="ViewA"/>
            <transition event="switch3" cond="_event.data == false" target="ViewB"/>
        </state>
    </state>
</scxml>

So it's all about this part:

cond="_event.data == true"

When I call

submitEvent("switch1", true)

the view is not changing.

But, if I put there an integer, for example

cond="_event.data == 5"

the view changes after calling:

submitEvent("switch1", 5)

Does somebody has any idea?
Thank you!

Pablo J. Rogina

@Mr_Gruber said in Problem with QScxmlStateMachine and boolean data type in SCXML transition condition:

scxml

What if you use the approach suggested in this answer (part #2)?
Simply checking for 0 or 1 in your SCXML "cond" property

Mr_Gruber

Thank you for your reply. By the way, I'm using QT 5.15.2
Unfortunately it doesn't work with 0 and 1. It works if I write it as a string

cond="_event.data == 'true'"

even if I leave the boolean in the code.

And there is one more thing, my scxml file is auto-generated by a statechart tool (yakindu), so the program should work with this scxml syntax.