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use std::fs::File;
use evdev_rs::enums::{BusType, EventCode, EventType, EV_KEY, EV_REL, EV_SYN};
use evdev_rs::{Device, DeviceWrapper, InputEvent, ReadFlag, UInputDevice, UninitDevice};
const MOUSE_STEP_X: i32 = 10;
const MOUSE_STEP_Y: i32 = 10;
fn main() -> Result<(), std::io::Error> {
// Parse command line arguments
let mut args = std::env::args();
if args.len() != 2 {
let n = args.nth(0).unwrap();
println!("Usage: `{} DEVICE`, eg. `{} /dev/input/event13`", n, n);
std::process::exit(1);
}
let device = &args.nth(1).unwrap();
// Connect to real keyboard
let f = File::open(device)?;
let d = Device::new_from_file(f)?;
if let Some(n) = d.name() {
println!(
"Connected to device: '{}' ({:04x}:{:04x})",
n,
d.vendor_id(),
d.product_id()
);
}
// Create virtual device
let u = UninitDevice::new().unwrap();
// Setup device
// per: https://01.org/linuxgraphics/gfx-docs/drm/input/uinput.html#mouse-movements
u.set_name("Virtual Mouse");
u.set_bustype(BusType::BUS_USB as u16);
u.set_vendor_id(0xabcd);
u.set_product_id(0xefef);
// Note mouse keys have to be enabled for this to be detected
// as a usable device, see: https://stackoverflow.com/a/64559658/6074942
u.enable_event_type(&EventType::EV_KEY)?;
u.enable_event_code(&EventCode::EV_KEY(EV_KEY::BTN_LEFT), None)?;
u.enable_event_code(&EventCode::EV_KEY(EV_KEY::BTN_RIGHT), None)?;
u.enable_event_type(&EventType::EV_REL)?;
u.enable_event_code(&EventCode::EV_REL(EV_REL::REL_X), None)?;
u.enable_event_code(&EventCode::EV_REL(EV_REL::REL_Y), None)?;
u.enable_event_code(&EventCode::EV_SYN(EV_SYN::SYN_REPORT), None)?;
// Attempt to create UInputDevice from UninitDevice
let v = UInputDevice::create_from_device(&u)?;
loop {
// Fetch keyboard events
let (_status, event) = d.next_event(ReadFlag::NORMAL | ReadFlag::BLOCKING)?;
// Map these to mouse events
println!("Event: {:?}", event);
// Map direction keys to mouse events
let e = match event.event_code {
EventCode::EV_KEY(EV_KEY::KEY_RIGHT) => Some((EV_REL::REL_X, MOUSE_STEP_X)),
EventCode::EV_KEY(EV_KEY::KEY_LEFT) => Some((EV_REL::REL_X, -MOUSE_STEP_X)),
EventCode::EV_KEY(EV_KEY::KEY_UP) => Some((EV_REL::REL_Y, -MOUSE_STEP_Y)),
EventCode::EV_KEY(EV_KEY::KEY_DOWN) => Some((EV_REL::REL_Y, MOUSE_STEP_Y)),
_ => None,
};
// Write mapped event
if let Some((e, n)) = e {
v.write_event(&InputEvent {
time: event.time,
event_code: EventCode::EV_REL(e),
value: n,
})?;
v.write_event(&InputEvent {
time: event.time,
event_code: EventCode::EV_SYN(EV_SYN::SYN_REPORT),
value: 0,
})?;
}
}
}
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