I can't seem to figure out how to create a window. Help!

[benjamin051000]

Hello! I'm new to Rust and winit. I'm trying to create a window as simply as possible. Running cargo run --example window works, but that example is over 1000 lines, and I'm hoping to slim it down so I'm not as overwhelmed by the configuration.

Here's the code I've come up with. main.rs:

use winit::{
    application::ApplicationHandler, 
    error::EventLoopError,
    event::WindowEvent,
    event_loop::EventLoop,
    window::Window
};

#[derive(Default)]
struct App {
    window: Option<Window>,
}

impl ApplicationHandler for App {
    fn resumed(&mut self, event_loop: &winit::event_loop::ActiveEventLoop) {
        self.window = Some(
            event_loop
                .create_window(Window::default_attributes())
                .expect("Couldn't create window"),
        );
    }

    fn window_event(
        &mut self,
        event_loop: &winit::event_loop::ActiveEventLoop,
        _window_id: winit::window::WindowId,
        event: winit::event::WindowEvent,
    ) {
        match event {
            WindowEvent::CloseRequested => {
                println!("Close button pressed. Exiting...");
                event_loop.exit();
            },
            WindowEvent::RedrawRequested => {
                self.window.as_ref().unwrap().request_redraw();
            },
            _ => (),
        }
    }
}

fn main() -> Result<(), EventLoopError> {
    let event_loop = EventLoop::new()?;
    let mut app = App::default();
    event_loop.run_app(&mut app)
}

I have created this by looking at both the winit documentation (the example on the first page) and the examples/window.rs file. This builds successfully and runs, but does not create a window on my system.

System info

❯ fastfetch
                                     ......             benjamin@desktop-suse
     .,cdxxxoc,.               .:kKMMMNWMMMNk:.         ---------------------
    cKMMN0OOOKWMMXo. A        ;0MWk:'      ':OMMk.      OS: openSUSE Tumbleweed 20240915 x86_64
  ;WMK;'       'lKMMNM,     :NMK'             'OMW;     Host: H410M H V2 (-CF)
 cMW;             WMMMN   ,XMK'                 oMM.    Kernel: Linux 6.10.9-1-default
.MMc             ''^*~l. xMN:                    KM0    Uptime: 13 hours, 48 mins
'MM.                   .NMO                      oMM    Packages: 3680 (rpm), 33 (flatpak-system), 1 (fla)
.MM,                 .kMMl                       xMN    Shell: zsh 5.9
 KM0               .kMM0' .dl>~,.               .WMd    Display (Acer XFA240): 1920x1080 @ 144 Hz in 24″ ]
 'XM0.           ,OMMK'    OMMM7'              .XMK     DE: KDE Plasma 6.1.5
   *WMO:.    .;xNMMk'       NNNMKl.          .xWMx      WM: KWin (Wayland)
     ^ONMMNXMMMKx;          V  'xNMWKkxllox0NMWk'       WM Theme: Breeze
         '''''                    ':dOOXXKOxl'          Theme: Breeze (Light) [Qt], Breeze [GTK2/3]
                                                        Icons: breeze [Qt], breeze [GTK2/3/4]
                                                        Font: Noto Sans (10pt) [Qt], Noto Sans (10pt) [GT]
                                                        Cursor: breeze (24px)
                                                        Terminal: kitty 0.36.2
                                                        Terminal Font: CaskaydiaCoveNF-Regular (12pt)
                                                        CPU: Intel(R) Core(TM) i5-10400F (12) @ 4.30 GHz
                                                        GPU: AMD Radeon RX 6700 XT [Discrete]
                                                        Memory: 11.39 GiB / 31.26 GiB (36%)
                                                        Swap: Disabled
                                                        Disk (/): 1.52 TiB / 1.60 TiB (95%) - btrfs
                                                        Disk (/mnt/ShareD): 290.63 GiB / 1.82 TiB (16%) -k
                                                        Local IP (enp8s0): 192.168.99.115/24
                                                        Locale: en_US.UTF-8

❯ rustup show
Default host: x86_64-unknown-linux-gnu
rustup home:  /home/benjamin/.rustup

stable-x86_64-unknown-linux-gnu (default)
rustc 1.81.0 (eeb90cda1 2024-09-04)

---

Cargo.toml:

[package]
name = "foo"
version = "0.1.0"
edition = "2021"

[dependencies]
winit = "0.30.5"

Any pointers would be greatly appreciated! Thanks!

[kchibisov]

You need to draw into window on Wayland for it to show up (the same will apply for XWayland, you'd still need to draw). Only on plain X11 it'll show up something without drawing anything at all.

[benjamin051000]

Ah, I see. That makes sense, thank you!