Cannot Translate QT Quick Properties Dynamically

[J.Hilk]

@closx
you could also delete mediaModel and recreate it.

[KroMignon]

@closx According to you r previous question about translation, this must work:

ListModel{
    id: tmodel
    ListElement {
        name: qsTr("Left Window") + mytrans.emptyString
        st:"LeftWindow"

    }
    ListElement {
        name: qsTr("Right Window") + mytrans.emptyString
        st:"RightWindow"
    }
}

Repeater {
    model:tmodel
    Text {
        text: name
    }    
}

I do something similar in my application and it works very well.

[closx]

@KroMignon Allright, your solution have worked for my last problem, but not for my current situation. sorry for being noobish, I have tried to change my code as you wrote. But after long tries, your solution worked for my last problem. But it is not working in current situation. My edited code is,

ListModel {
    id: controlsModel
    ListElement {
       name: qsTr("Tables") + mytrans.emptyString
       st: "Tables"
       bg: "qrc:/design/controls/leftmenu/tables.png"
    }
    ListElement {
        name: qsTr("Curtains") + mytrans.emptyString
        st: "Curtains"
        bg: "qrc:/design/controls/leftmenu/curtains.png"
    }
    ListElement {
        name: qsTr("Refrigerator") + mytrans.emptyString
        st: "Refrigerator"
        bg: "qrc:/design/controls/leftmenu/refrigerator.png"
    }
    ListElement {
        name: qsTr("Safe Box") + mytrans.emptyString
        st: "SafeBox"
        bg: "qrc:/design/controls/leftmenu/safebox.png"
    }
    ListElement {
        name: qsTr("Air Condition") + mytrans.emptyString
        st: "AirConditioner"
        bg: "qrc:/design/controls/leftmenu/airconditioner.png"
    }
    ListElement {
        name: qsTr("Smoke Fan") + mytrans.emptyString
        st: "SmokeFan"
        bg: "qrc:/design/controls/leftmenu/smokefan.png"
    }
    ListElement {
        name: qsTr("Windows") + mytrans.emptyString
        st: "Windows"
        bg: "qrc:/design/controls/leftmenu/windows.png"
    }
    ListElement {
        name: qsTr("Bar") + mytrans.emptyString
        st: "Bar"
        bg: "qrc:/design/controls/leftmenu/bar.png"
    }
    ListElement {
        name: qsTr("Espresso") + mytrans.emptyString
        st: "Espresso"
        bg: "qrc:/design/controls/leftmenu/espresso.png"
    }
    ListElement {
        name: qsTr("Roof") + mytrans.emptyString
        st: "Roof"
        bg: "qrc:/design/controls/leftmenu/roof.png"
    }
}

    Repeater {
        model:controlsModel
        Text {
            text: name
        }
}

And the error output is,

qrc:/SGlobal.qml:691 ListElement: cannot use script for property value
15:31:38: /home/closx/build-ProAutoVip-Desktop_Qt_5_12_3_GCC_64bit-Debug/autovip_ls/autovip_ls exited with code 255

@J-Hilk What you mean by deleting and recreating it? I would write the same codes even if I would delete :D Again, sorry for being noobish!

[KroMignon]

@closx no problem, I also had to learn many things to be able to work with Qt/QML!

Just question about mytrans, I think it is an instance of something like this:

class TranslationHelper : public QObject
{
    // Q_OBJECT is important to have signal/slot working
    Q_OBJECT

    Q_PROPERTY(QString emptyString     READ emptyString     NOTIFY languageChanged)

public:
    explicit TranslationHelper(QObject *parent = nullptr);

    QString emptyString() const
    {
        return QString();
    }

signals:
    void languageChanged();
};

Can you confirm or show your differences?

[closx]

@KroMignon Yep, true. Full code,

class Translator : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QString emptyString READ getEmptyString NOTIFY languageChanged)

public:
    Translator(QGuiApplication* app) { mApp = app; }

    QString getEmptyString() { return ""; }

signals:
    void languageChanged();

public slots:
    void updateLanguage(int lang){
        switch(lang){
        case Langs::AR:
            mTranslator.load("general_AR", ":/translator");
            mApp->installTranslator(&mTranslator);
            break;
        case Langs::JAP:
            mTranslator.load("general_JA", ":/translator");
            mApp->installTranslator(&mTranslator);
            break;
        case Langs::TR:
            mTranslator.load("general_TR", ":/translator");
            mApp->installTranslator(&mTranslator);
            break;
        default:
            mApp->removeTranslator(&mTranslator);
            break;
        }
        emit languageChanged();
    }

private:
    QGuiApplication* mApp;
    QTranslator mTranslator;
};

[KroMignon]

@closx said in Cannot Translate QT Quick Properties Dynamically:

qrc:/SGlobal.qml:691 ListElement: cannot use script for property value

ah, I am stupid! Sorry, I was wrong. This a known Qt/QML bug ==> QTBUG-16289
In my application, I don't use ListModel/ListElement, I use an array of QtObject.
I do something similar to this
a. define a base type => MyElement.qml

import QtQuick 2.0

QtObject {
    property string name: ""
    property string st: ""
    property string bg: ""
}

b. then use it:

property list<MyElement> myModel: [
    MyElement{
        name: qsTr("Left Window") + mytrans.emptyString
        st:"LeftWindow"
    },
    MyElement{
        name: qsTr("Right Window") + mytrans.emptyString
        st:"RightWindow"
    }
]

//Repeater {
//   model: myModel.length
//    Text {
//        text: myModel[index].name
//    }    
//}
Repeater {
    model: myModel
    Text {
        text: model.name
    }    
}

[fcarney]

@KroMignon said in Cannot Translate QT Quick Properties Dynamically:

mytrans.emptyString

I just finished translating an application with more than 3000 entries. qsTr worked fine for everything I needed to translate on the QML side.

What is this "mytrans.emptyString" construct and what does it do?

[KroMignon]

@fcarney mytrans.emptyString is only a fake, it always returns an empty string.
It is used to force re-calling qrTr() to get new string for current language.
After changing language / TS file, the corresponding signal is triggered, so translation string are updated without having to restart application.

Take a look at https://wiki.qt.io/How_to_do_dynamic_translation_in_QML for more details.

[fcarney]

@KroMignon said in Cannot Translate QT Quick Properties Dynamically:

without having to restart application

Interesting. For now we restart the app. I didn't realize QML would not update if you tried to do it dynamically. Thanks!

[closx]

@KroMignon Hey! I forgot to answer to you! Did not meant to be rude and sorry for that :(
Conclusion: I gave some tries with your suggest and lots of other stuff on internet, but failed :D
So I have created a "Restart the system to apply all the language changes" screen and a "restart/cancel" choice on a language change state. I guess it will be okay even if it wont be "real-time" :P
Good Work!