#keyboard #mouse #automation #control


The Fat Controller. A library for simulating mouse and keyboard events.

9 releases (4 breaking)

0.5.2 Feb 28, 2021
0.5.1 Feb 26, 2021
0.4.0 Feb 23, 2021
0.3.0 Feb 17, 2021
0.1.1 Feb 11, 2021

#20 in Windows APIs

Download history 81/week @ 2021-02-11 38/week @ 2021-02-18 62/week @ 2021-02-25 24/week @ 2021-03-04 2/week @ 2021-03-11 1/week @ 2021-03-18 29/week @ 2021-03-25 7/week @ 2021-04-01 12/week @ 2021-04-08

63 downloads per month
Used in tfc-server


4.5K SLoC

The Fat Controller

Crates.io Docs.rs License

TFC is a library for simulating mouse and keyboard events. This library was built for use by TFC-server, a server that allows for remote control of a PC via a mobile app.


  • Mouse clicks
  • Mouse motion (relative and absolute)
  • Mouse scrolling (smooth scrolling where supported)
  • Key presses
  • Translating Unicode characters to key presses
  • Typing arbitrary Unicode strings
  • Getting the mouse position
  • Getting the size of the screen


  • Linux - With X11
  • Linux - Without X11
  • macOS
  • Windows


Add the following to your Cargo.toml:

tfc = "0.5"


There are two implementations for Linux, one that uses X11, and one that depends only on the Linux kernel. The implementation that doesn't use X11 is missing some features. It is intended for Wayland but Wayland is a bit more locked down compared to X11, hence the missing features.

With X11

Before using the X11 implementation, the X11, XTest and xkbcommon development libraries need to be installed. Using apt, the following snippet can be used.

sudo apt install libx11-dev libxtst-dev libxkbcommon-dev

Without X11

The non-X11 implementation (called Wayland within the code base) uses /dev/uinput. Before this can be used, TFC needs permission to write to the device. To grant permissions temporarily (until the next reboot), use the following snippet.

chmod +0666 /dev/uinput

To grant permissions permanently, use the following snippet.

# Create a group
sudo groupadd -r uinput
# Add yourself to the group
sudo usermod -aG uinput $USER
# Give the group permissions to use the uinput kernel module
echo 'KERNEL=="uinput", MODE="0660", GROUP="uinput", OPTIONS+="static_node=uinput"' \
| sudo tee /etc/udev/rules.d/60-tfc.rules

Use the following snippet if this doesn't take effect immediately. If all else fails, reboot.

udevadm control --reload-rules && udevadm trigger

To revoke permissions, use the following snippet.

sudo rm /etc/udev/rules.d/60-tfc.rules


use tfc::{Context, Error, traits::*};
use std::{f64::consts::PI, thread, time::Duration};

fn main() -> Result<(), Error> {
    let mut ctx = Context::new()?;
    let radius = 100.0;
    let center = ctx.cursor_location()?;
    let center = (center.0 as f64 - radius, center.1 as f64);
    let steps = 200;
    let revolutions = 3;
    let delay = Duration::from_millis(10);

    for step in 0..steps * revolutions {
        let angle = step as f64 * 2.0 * PI / steps as f64;
        let x = (center.0 + radius * angle.cos()).round() as i32;
        let y = (center.1 + radius * angle.sin()).round() as i32;
        ctx.mouse_move_abs(x, y)?;