setWindowIcon only works once?

dheerendra

Can you show me how you are getting the object m_application ? Are you creating it ?

Slei

I'm creating the object my self in an custom object which is created in the main.cpp:

``

MyApp.h
std::unique_ptr<QApplication> m_application;

MyApp.cpp
m_application = std::make_unique<QApplication>(argc,
argv);

dheerendra

show me your main.cpp ?

Slei

@dheerendra ```

int main(int argc, char *argv[])
{
MyApp a(argc, argv);
MainWindow w;
w.show();

//this just uses the QApplication exec
return a.exec();
}


In generall i'm actually using the MyApp just as it would be a QApplication directly nothing special,

dheerendra

MyApp is inherited from QApplication ?

Slei

@dheerendra
no it just has a QApplication member and has similar member functions(like exec)

MyApp.h
std::unique_ptr<QApplication> m_application;

dheerendra

My suspect was you have two different instances of QApplication and could be causing the issue. Looks like this is not issue.

I tried on Windows & Mac. It works without any issue. Can you try the following sample?

void MyWidget::on_pushButton_clicked()
{
qDebug() << Q_FUNC_INFO << endl;
qApp->setWindowIcon(QIcon(":/Phone_1.jpg"));
}

void MyWidget::on_pushButton_2_clicked()
{
qDebug() << Q_FUNC_INFO << endl;
qApp->setWindowIcon(QIcon(":/RightOption.png"));
}
==========main.cpp =========

QApplication a(argc, argv);
a.setWindowIcon(QIcon(":/Air.png"));
MyWidget w;
w.show();

Slei

@dheerendra
I'm using QML instead of QWidget for the gui app, might there be any issue?

dheerendra

Yes. it is issue with QML application. It is bug. It should work the same way. Issue is coming from application object. Instead of using the application object to change with window icon, we can use the top-level window object & use the setIcon(...) method to set it. It should work.

Slei

Ok Its working now, the issue was indeed QML, now I'Ve just the QQuickWindow as base class for my QML window and use its seticon function on each window instead of using the QApplication setWindowicon

dheerendra

That is good. You can move the issue to "Solved" state. Enjoy the Qt Programming.