winit 0.29.15

Cross-platform window creation library.
Documentation 
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#![allow(clippy::single_match)]

use simple_logger::SimpleLogger;
use winit::{
    event::{DeviceEvent, ElementState, Event, KeyEvent, WindowEvent},
    event_loop::EventLoop,
    keyboard::{Key, ModifiersState, NamedKey},
    window::{CursorGrabMode, WindowBuilder},
};

#[path = "util/fill.rs"]
mod fill;

fn main() -> Result<(), impl std::error::Error> {
    SimpleLogger::new().init().unwrap();
    let event_loop = EventLoop::new().unwrap();

    let window = WindowBuilder::new()
        .with_title("Super Cursor Grab'n'Hide Simulator 9000")
        .build(&event_loop)
        .unwrap();

    let mut modifiers = ModifiersState::default();

    event_loop.run(move |event, elwt| match event {
        Event::WindowEvent { event, .. } => match event {
            WindowEvent::CloseRequested => elwt.exit(),
            WindowEvent::KeyboardInput {
                event:
                    KeyEvent {
                        logical_key: key,
                        state: ElementState::Released,
                        ..
                    },
                ..
            } => {
                let result = match key {
                    Key::Named(NamedKey::Escape) => {
                        elwt.exit();
                        Ok(())
                    }
                    Key::Character(ch) => match ch.to_lowercase().as_str() {
                        "g" => window.set_cursor_grab(CursorGrabMode::Confined),
                        "l" => window.set_cursor_grab(CursorGrabMode::Locked),
                        "a" => window.set_cursor_grab(CursorGrabMode::None),
                        "h" => {
                            window.set_cursor_visible(modifiers.shift_key());
                            Ok(())
                        }
                        _ => Ok(()),
                    },
                    _ => Ok(()),
                };

                if let Err(err) = result {
                    println!("error: {err}");
                }
            }
            WindowEvent::ModifiersChanged(new) => modifiers = new.state(),
            WindowEvent::RedrawRequested => fill::fill_window(&window),
            _ => (),
        },
        Event::DeviceEvent { event, .. } => match event {
            DeviceEvent::MouseMotion { delta } => println!("mouse moved: {delta:?}"),
            DeviceEvent::Button { button, state } => match state {
                ElementState::Pressed => println!("mouse button {button} pressed"),
                ElementState::Released => println!("mouse button {button} released"),
            },
            _ => (),
        },
        _ => (),
    })
}