I’m working on adding a GUI to a working CLI application with rs-gtk & siblings. I’d like to mutate the application data on at least some events. This doesn’t seem to be possible with the current rs-gtk API, as trying to compile the invocation gets the rather obfuscated error message:
gtk.rs:47:73: 47:77 error: cannot borrow captured outer variable in an `Fn` closure as mutable gtk.rs:47 board.connect_button_press_event(move |_, e| make_user_play(e, &mut game)); ^~~~ gtk.rs:47:38: 47:78 help: consider changing this closure to take self by mutable reference gtk.rs:47 board.connect_button_press_event(move |_, e| make_user_play(e, &mut game)); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I eventually figured out that that error message means I need to change connect_button_press_event to take an FnMut instead of an FnOnce. But this isn’t in my sources, so that’s not a good long-term solution. This also prevents
Is this just a problem in the rs-gtk API, or is it something I’m missing? A more appropriate architecture for gtk or rs-gtk apps? Something else I’ve missed?