How can I get the application QmlEngine ?
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@kmarconi
what would you consider a proper retranslate functionality ?You can either,
- call retranslate() on the QQmlEngine,
- update the strings via the empty string property workaround
- reload the qml file entirely
there are not other ways, at least that I know of
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@J-Hilk Calling retranslate for me is the cleanest way. No need to add "+trans.emptyString" on each of my qsTr object and I have a lot. I need to figure out how to solve this infinite binding loop. Is reloading the whole qml a heavy task for the system ?
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@kmarconi said in How can I get the application QmlEngine ?:
I still will try it but I hope to find a way to use the retranslate function properly.
I can not figure out what your problem is.
@J-Hilk have give you all information you need to do it.If you are using Qt 5.10 and upper (which is not my case) simply follow documentation
That's not so complicated to follow, you could create a class which handle the locales, for example let it call LocalHandler, when you have install the new translator withQCoreApplication::installTranslator()
then emit a signal for example calledtranslationUpated()
.
Then in your main.cpp:LocalHandler loc; QObject::connect(&loc, &LocalHandler::translationUpated, engine, &QQmlEngine::retranslate);
Alternatively you can use a
app->installEventFilter()
to catchQEvent::LanguageChange
and then triggerQQmlEngine::retranslate()
.For prior version, you have to do more work ==> https://retifrav.github.io/blog/2017/01/04/translating-qml-app/
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@KroMignon I already done everything you told me but thank you ;) I was just saying that if I could not use the emptyString trick it could be interesting for me. Why I'm saying this is because with the trick , I have the error " ListElement: cannot use script for property value" . Is is because I cannot use the trick in a ListElement object ?
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@kmarconi said in How can I get the application QmlEngine ?:
I have the error "ListElement: cannot use script for property value"
AFAIK, ListElement cannot be changed dynamically ==> cf QTBUG-16289
edit
You have to use
QT_TR_NOOP()
andqsTr()
on the delegate, like this (extract from QTBUG-16289):ListModel { id: myModel ListElement { desc: QT_TR_NOOP("Example") } } ListView { model: myModel delegate: Text { text: qsTr(desc) } }
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@KroMignon Yeah just seen it on a stackoverflow post (https://stackoverflow.com/questions/7659442/listelement-fields-as-properties) but I canno't change my qml part because the way it is designed is fixed so I need to find a way to use the retranslate function without having this binding loop.
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@kmarconi said in How can I get the application QmlEngine ?:
I need to find a way to use the retranslate function without having this binding loop.
Take a look at the QTBUG-16289, the way they propose is to use
QT_TR_NOOP()
on ListElement to add string in translation file, and to useqsTr()
in the delegate to do translation. -
@kmarconi said in How can I get the application QmlEngine ?:
Damn it is so hard to debug a binding loop with QT.
Yes, binding loops are the hell!
Which Qt Version are you using? For Qt 5.10 and upper you can enable tracing to help you to find bindings problems withQT_LOGGING_RULES
.
For example in your main.cpp:qputenv("QT_LOGGING_RULES", "qt.qml.binding.removal.info=true");
Take look at this https://www.kdab.com/new-qt-5-10-diagnostics-breaking-qml-bindings/ for more details.
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@kmarconi said in How can I get the application QmlEngine ?:
Here is my main.qml file :
Item {
id:root
visible: true
width: 640
height: 480property var mainMenu: Menu{rootStack: root} StackView { anchors.fill: parent id: menuStack property var button: hmiclass.button initialItem: mainMenu onButtonChanged: { mainMenu.onButtonPushed(button) } }
}
EDIT: I need to find where that loop is coming from.. Or to find a patch to refresh only the bindings which are in the translation file.
This is the one
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@kmarconi said in How can I get the application QmlEngine ?:
the error is : QML StackView: Binding loop detected for property "button"
According to your code, it looks like
mainMenu.onButtunPushed()
will changehmiclass.button
content, which will recallmainMenu.onButtunPushed()
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@kmarconi said in How can I get the application QmlEngine ?:
Yeah that's what I tought but why this error is only showing on retranslate and not on the app boot too ?
Because there have to be a first change to start the loop!
I don't know what is changinghmiclass.button
?I suppose
hmiclass
is a C++ class instance andbutton
is a property of this class.
In some way the attached signal to this property is emitted, which will start the loop.That is just an hypothesis, I don't have a clue about your code.
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@KroMignon Yeah sorry I know that I'm asking a lot of help without any clue of my code. But I canno't share more information about it, I'm sorry... Will try to solve my problem with what you gave me today and will keep you updated. Thanks a lot