feat(linux): expose `gtk_window` method

[reujab]

Nice project, I'd love to make some desktop widgets for Linux using Tauri. Is there any way we could set the type hint on Linux and possibly use the layer shell API?

Describe alternatives you've considered
Perhaps the developer could create their own modified window and pass it to Tauri or modify it in a closure?

[nothingismagick]

Thanks for the suggestion, but we are about to enter code freeze, and the core team won't be accepting non critical features for at least the next several months. That said, if you wanted to create a PR that addresses your concerns, I am sure we would review. The proper place though, is going to be in the tao or wry repositories, Tauri would then integrate such low level interfacing.

[amrbashir]

No additional functionality is needed in Tao, we already expose a method to get the gtk_window so users can do what they want with it, will transfer back to tauri.

[amrbashir]

Here is the relevant code in Tao https://www.github.com/tauri-apps/tao/tree/dev/src%2Fplatform%2Funix.rs#L18

[LucaCoduriV]

@reujab Hello, did you achieve to create a layer shell ?

[LucaCoduriV]

No additional functionality is needed in Tao, we already expose a method to get the gtk_window so users can do what they want with it, will transfer back to tauri.

It looks like it is impossible to make a layer shell because the gtk_window is already used before getting it with the getter.

[JohnDoeAntler]

No additional functionality is needed in Tao, we already expose a method to get the gtk_window so users can do what they want with it, will transfer back to tauri.

It looks like it is impossible to make a layer shell because the gtk_window is already used before getting it with the getter.

Agree, here is my attempt

// tauri = { version = "1.4", features = ["shell-open"] }
// serde = { version = "1.0", features = ["derive"] }
// serde_json = "1.0"
// gtk-layer-shell = "0.4.4"

// Prevents additional console window on Windows in release, DO NOT REMOVE!!
#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]

use tauri::Manager;
use gtk_layer_shell::init_for_window;

fn main() {
    tauri::Builder::default()
      .setup(|app| {
        let main_window = app.app_handle().get_window("main").unwrap();
        let gtk_window = main_window.gtk_window().unwrap();

        init_for_window(&gtk_window);
        
        Ok(())
      })
      .run(tauri::generate_context!())
      .expect("error while running tauri application");
}

the result looks just like what @LucaCoduriV said

** (tauri-app:1234859): CRITICAL **: 20:59:12.253: custom_shell_surface_init: assertion '!gtk_widget_get_mapped (GTK_WIDGET (gtk_window))' failed

https://github.com/wmww/gtk-layer-shell/blob/master/src/custom-shell-surface.c#L80

Since the initial goal was to enable Tauri to use layer shell, should this issue be marked as open again?

[LucaCoduriV]

To be able to make layer shell would be so nice ! It would open a lot of possibilities !

[LucaCoduriV]

@amrbashir @nothingismagick
Can we reopen this issue ?

[amrbashir]

the expected API is already exposed here https://docs.rs/tauri/latest/tauri/window/struct.Window.html#method.gtk_window so there is no reason to re-open the issue.

[FabianLars]

Well, this part seems to be unresolved:

It looks like it is impossible to make a layer shell because the gtk_window is already used before getting it with the getter.

Though i'm not sure how to resolve it in tauri tbh. Maybe a setter in the WindowBuilder? Or maybe this is just something we consider out of scope for tauri itself and something that should be done by using Wry instead idk