QT QML error : can't apply a state change as part of a state definition - qt

Question

I'am struggling with the issue indicated in the title.
When trying to switch state after a custom signal made from C++ was triggered, i have this error coming from my QML script : can't apply a state change as part of a state definition.
I have barely found information about that same error on internet and i have struggling for days trying to fix this without success. Regarding the error, it's assumed that i'm trying to change state in a state definition but it's definitely not the case.
Here is a sample of my code:
Connections {
target: timer
function onTriggered() {rectangle.state = "welcomeState"}
}
Connections {
target: testBack
function onPrintDataReady() {rectangle.state = "printState"}
}
Connections {
target: boutonOui
function onPressed() {rectangle.state = "endState";testBack.printFile() }
}
Connections {
target: boutonNon
function onPressed() {rectangle.state = "endState"}
}
And the states are defined here:
states: [
State {
name: "welcomeState"
PropertyChanges {
target: logo_2
visible: false
}
PropertyChanges {
target: messageFin
visible: false
}
PropertyChanges {
target: boutonOui
visible: false
}
PropertyChanges {
target: boutonNon
visible: false
}
PropertyChanges {
target: impressionTicket
visible: false
}
},
State {
name: "printState"
PropertyChanges {
target: boutonOui
visible: true
text: qsTr("OUI")
}
PropertyChanges {
target: boutonNon
visible: true
text: "NON"
}
PropertyChanges {
target: logo_1
visible: false
}
PropertyChanges {
target: impressionTicket
visible: true
}
PropertyChanges {
target: logo_2
visible: true
}
PropertyChanges {
target: messageFin
visible: false
text: qsTr("Merci de votre visite. A bientôt.")
}
},
State {
name: "endState"
PropertyChanges {
target: logo_1
visible: false
}
PropertyChanges {
target: logo_2
visible: true
}
PropertyChanges {
target: messageFin
visible: true
text: qsTr("Merci de votre visite. A bientôt.")
anchors.verticalCenterOffset: 1
anchors.horizontalCenterOffset: 1
}
PropertyChanges {
target: boutonNon
visible: false
text: qsTr("NON")
}
PropertyChanges {
target: impressionTicket
visible: false
}
PropertyChanges {
target: boutonOui
visible: false
}
PropertyChanges {
target: timer
running: true
triggeredOnStart: false
interval: 6000
}
}
]
I can't switch to the state "printState" for the target "testBack". "testBack" is a C++ object made accessible in QML imported from C++ and so, onPrintDataReady() is a custom signal.
And the first state is "welcomeState":
Rectangle {
id: rectangle
width: 800
height: Constants.height
color: "#eb5a2d"
state: "welcomeState"
property alias messageFin: messageFin
property alias logo_1: logo_1
property bool property0: true
That transition is the only one that is not working among the 4 transition that are indicated.
Any help would be appreciated.
I made sure that the onPrintDataReady() was fired by changing the color of the rectangle instead of the state and it worked.
I tried to made the connection directly in the item "testBack" but the issue was still here.
I set the variable STATECHANGE_DEBUG to 1 but didn't give me any interesting information for my problem.
Tried the other transitions and it's all working except the one that is in testBack
And now i'm running out of idea.

Answer 1

Finally found a turnaroud.
Instead of going fromwelcomeState to printState through the onPrintDataReady signal, i activated a timer when printerDataReady was triggered and when receiving the trigger signal from this timer, i did the transition from welcomeState to printState so this is what i have now :
Connections {
target: timer3
function onTriggered() {testBack.waitForPrint()}
}
Connections {
target: timer2
function onTriggered() {rectangle.state = "welcomeState"}
}
Connections {
target: testBack
function onPrintDataReadyChanged() {timer.start()}
}
Connections {
target: timer
function onTriggered() {rectangle.state = "printState"}
}
Connections {
target: boutonOui
function onPressed() {rectangle.state = "endState";testBack.printFile()}
}
Connections {
target: boutonNon
function onPressed() {rectangle.state = "endState"}
}