Dynamic Language Change

Alpkan

I couldn't fix the issue how i will fix these warnings

Christian Ehrlicher

Please post code instead screenshots.

QLabel ctor wants a QWidget-derived class, your MyWidget does not derive from QWidget but from QObject.

J.Hilk

@Alpkan in addition to what @Christian-Ehrlicher said, QCoreApplication does not support QWidgets, use at least QApplication instead (or QGuiApplication)

therefore I think your pro file is probably missing important QT += linkages too

Alpkan

@Christian-Ehrlicher

QT -= gui
QT += core
QT += widgets

I understand your point but i am trying do without qapplication

KroMignon

@Alpkan said in Dynamic Language Change:

I understand your point but i am trying do without qapplication

This is a non sense, if you want to use QWidget you need a QApplication or QGuiApplication

QApplication specializes QGuiApplication with some functionality needed for QWidget-based applications. It handles widget specific initialization, finalization.

For any GUI application using Qt, there is precisely one QApplication object, no matter whether the application has 0, 1, 2 or more windows at any given time. For non-QWidget based Qt applications, use QGuiApplication instead, as it does not depend on the QtWidgets library.

Some GUI applications provide a special batch mode ie. provide command line arguments for executing tasks without manual intervention. In such non-GUI mode, it is often sufficient to instantiate a plain QCoreApplication to avoid unnecessarily initializing resources needed for a graphical user interface. The following example shows how to dynamically create an appropriate type of application instance:

=> https://doc.qt.io/qt-5/qapplication.html#details

Alpkan

so there is a code which is

MyWidget::MyWidget(QWidget *parent) : QWidget(parent)
{
titleLabel = new QLabel(this);
okPushButton = new QPushButton(this);
// Fire the LanguageChange event - the event handler will set the texts:
QEvent languageChangeEvent(QEvent::LanguageChange);
QCoreApplication::sendEvent(this, &languageChangeEvent);
}

void MyWidget::changeEvent(QEvent *event)
{
if (event->type() == QEvent::LanguageChange) {
titleLabel->setText(tr("Document Title"));
okPushButton->setText(tr("&OK"));
} else {
QWidget::changeEvent(event);
}
}
*
this code is written for dynamic language change
if is it possible use that code can u explain to me than i will do it if it is not what is true way

J.Hilk

@Alpkan It's not, changeEvent has its root in QWidget not in QObject you can't simply name a function changeEvent in a non QWidget based class and expect it to behave like a QWidget.

I think you want to notify your QObject based classes that a new language has been set and they should change their strings, right?

You'll have to find a way to notify them yourself. There are countless ways, but - afaik - no ready made Qt ways