How to set application icon

[andrej-urvantsev]

Disclaimer: I'm a newbie in both Rust and Qt and started a toy project to learn both.

In all examples about QT it states that setting an icon is just invoking a method on application object:

app.setWindowIcon(QIcon(":/path/to/icon.png"));

But I'm struggling to understand how to implement similar via rust/cxx-qt: I don't see that method on QApplication type and don't understand how to import QIcon into Rust.

Could somebody provide an example of how to do that 🙏🏻 ?

[ahayzen-kdab]

At the moment there is no existing binding around QIcon, once that exists then QApplication and/or QGuiApplication could add setWindowIcon.

As a workaround you could write a C++ method like

void appSetWindowIcon(const QString& path) {
  Q_ASSERT(qGuiApp != nullptr);
  qGuiApp->setWindowIcon(QIcon(path));
}

Then use a normal CXX C++ bridge to use that

...
unsafe extern "C++" {
   include!("path/to/cpp/header.h");
   fn appSetWindowIcon(path: &QString);
}
...

A lot of the time if you are missing things, either it means writing bindings yourself, reusing extern C++Qt blocks where possible, or writing a C++ method that takes simpler types that already have bindings.

[andrej-urvantsev]

It took more efforts, but worked. Thanks!