OnEntry/OnExit/OnTransition signals for SCXML

Phrogz

I have an application using an SCXML StateMachine. I want to receive signals in QML when I enter or exit particular states, or (stretch goal) when certain transitions are executed.

According to this post I can emit a custom signal like so:
<onentry><send type="qt:signal" event="enteredFoo"/></onentry>

However, I cannot figure out how to actually connect to such a signal in QML. For example, the code at bottom (unsurprisingly) produces the error:
TypeError: Cannot call method 'connect' of undefined

How can I detect when the state machine enters or exits a state?

import QtQuick 2.7
import QtScxml 5.8

Window {
    visible: true
    property StateMachine logic: logicLoader.stateMachine
    StateMachineLoader { id:logicLoader; source:"main.scxml" }
    Component.onCompleted: {
        logic.enteredFoo.connect(function(){
            console.log('w000t');
        });
    }
}

Phrogz

Of course the answer is RTFM :)

The documentation on state machines mentions the EventConnection type. This emits a single occurred signal when specific, listed SCXML events occur (fired without the type="qt:signal" attribute), and allows patterns like:

property StateMachine logic: logicLoader.stateMachine
StateMachineLoader { id:logicLoader; source:"main.scxml" }
EventConnection {
    signal enteredFoo(var event)
    signal enteredBar(var event)
    stateMachine: logic
    events: ["enteredFoo", "enteredBar"]
    onOccurred: this[event.name](event);
}

This requires you to manually enter the enter/exit/transition event three times:

In the SCXML as a send action
In the EventConnection as a signal
In the events list in the EventConnection

...but it does work!

Hey Qt! Please add a better way to do this! :)