Global shortcuts on the main view does not work for Linux platform

[dajoha]

On a Linux OS, when adding .on_key_up() or .on_key_down() to the main view in order to register some global shortcuts, nothing happens. Hitting any key does not trigger the keyboard event.

How to reproduce

On a Linux OS, run this code (floem = 0.1.1):

use floem::{
    keyboard::{Key, NamedKey, ModifiersState},
    view::View,
    views::{Decorators, empty},
};

fn app_view() -> impl View {
    empty().on_key_up(Key::Named(NamedKey::F11), ModifiersState::empty(), move |_| {
        println!("Hit F11");
    })
}

fn main() {
    floem::launch(app_view);
}

Then press the "F11" key => nothing is printed to the console.

The same problem happens:

• when running the floem example "counter" (hitting "F11" should open the inspector);
• when using another keystroke (nothing to deal with "Fxx" keys).

Tiny investigation

Maybe this is because the user's main view is wrapped into a stack(container()) for linux platforms:

floem/src/window_handle.rs

Line 108 in ab125b7

#[cfg(target_os = "linux")]

        #[cfg(target_os = "linux")]
        let view = with_scope(scope, move || {
            stack((
                container(view_fn(window_id)).style(|s| s.size(100.pct(), 100.pct())),
                context_menu_view(scope, window_id, context_menu, size),
            ))
            .style(|s| s.size(100.pct(), 100.pct()))
            .any()
        });

As an experiment I tried to replace this block by:

        #[cfg(target_os = "linux")]
        let view = with_scope(scope, move || view_fn(window_id));

Then the global shortcut worked (it crashed the app totally, but it prooves that the keyboard event was triggered, indeed other keys did nothing at all).