How to pass a Sender from gtkApplication to gtkWindow?

Question

I am passing the sender of on async channel to a modal window so that the modal window can send messages to the parent window:

...
let (tx, rx): (Sender<ApplicationMessage>, Receiver<ApplicationMessage>) = async_channel::bounded(1);

        let window = MainWindow::new(&*self.obj());
        window.connect_close_request(move |window| {
            debug!("connect_close_request");

            let dialog = ConfirmCloseDialog::new(window, &tx);
            dialog.set_transient_for(Some(window));
            dialog.present();

            // glib::Propagation::Proceed
            glib::Propagation::Stop
        });

and I added pub fn new<P: IsA<gtk::Window>>(window: &P, tx: &Sender<ApplicationMessage>) -> Self to the impl of the dialog. How do I store the tx in the imp struct of the dialog?

kunerd · Accepted Answer · 2025-06-06 09:05:52Z

0

First of all you should change tx: &Sender<...> to tx: Sender<...> in your constructor. Senders are cheap to clone, so even if you will need multiple ones, you just can tx.clone() them. Your dialog struct would then look something like this:


struct Dialog {
    tx: Sender<ApplicationMessage>, 
    // rest of your fields
}

impl Dialog {
    pub fn new<P: IsA<gtk::Window>>(window: &P, tx: Sender<ApplicationMessage>) -> Self {
    Self {
        tx,
        // rest of your fields
    }
}

answered Jun 6 at 9:05

kunerd

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