Put all labels in an external file, which pattern to use ?

[oswalidos]

Hello,

I want to put all messages and labels, sql queries ... in external files so i won't dive in the code to change a label or an url later, i think i'll use Qsettings, now the problem is :
1) is it good to make Qsettings instance as global instance using Q_GLOBAL_STATIC ? i think it's bad it. (actually target platforms are mac and windows but laters it'll be mobile, so probably performance is important)
2) I have an idea that may appear weird : to make all my classes which need Qsettings instance inherits from a class that contains qsettings instance ready for use, if it's bad, why ?

I googled for some hours and i didn't find a good solution, i found someone trying to implement dependency injection by editing the singleton pattern but honestly i didn't get it,

There is certainly many who faced the same problem, would you tell me please what is the best approach ?

Thanks in advance.

[ChrisW67]

I think you are trying to solve a problem that does not exist. You create a QSettings object when you need it, use it, and discard it. There is no need to keep a QSettings instance in a global variable. You can set some common values used by QSettings once (usually in main) to make using QSettings elsewhere trivial.

int main(...) {
    QApplication app(argc, argv);
 
    QCoreApplication::setOrganizationName("MySoft");
    QCoreApplication::setOrganizationDomain("mysoft.com");
    QCoreApplication::setApplicationName("Star Runner");
 
...
}
 
// elsewhere
void foo() {
    QSettings settings;
    QString label = settings.value("Label", "Default value").toString();
}
 
void bar() {
    QSettings settings;
    QString label = settings.value("OtherLabel", "Default value").toString();
}

int main(...) {
    QApplication app(argc, argv);

    QCoreApplication::setOrganizationName("MySoft");
    QCoreApplication::setOrganizationDomain("mysoft.com");
    QCoreApplication::setApplicationName("Star Runner");
 
...
}

// elsewhere
void foo() {
    QSettings settings;
    QString label = settings.value("Label", "Default value").toString();
}

void bar() {
    QSettings settings;
    QString label = settings.value("OtherLabel", "Default value").toString();
}

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QSettings is for storing relatively small amounts of information.

The Qt translation mechanism may be a better way to handle the label text if you are trying to achieve for example French/Arabic versions of the labels.