rdev 0.5.3

Listen and send keyboard and mouse events on Windows, Linux and MacOS.
Documentation 
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use crate::linux::keyboard::Keyboard;
use crate::linux::keycodes::key_from_code;
use crate::rdev::{Button, Event, EventType, KeyboardState};
use std::convert::TryInto;
use std::os::raw::{c_int, c_uchar, c_uint};
use std::ptr::null;
use std::time::SystemTime;
use x11::xlib;

pub const TRUE: c_int = 1;
pub const FALSE: c_int = 0;

// A global for the callbacks.
pub static mut KEYBOARD: Option<Keyboard> = None;

pub fn convert_event(code: c_uchar, type_: c_int, x: f64, y: f64) -> Option<EventType> {
    match type_ {
        xlib::KeyPress => {
            let key = key_from_code(code.into());
            Some(EventType::KeyPress(key))
        }
        xlib::KeyRelease => {
            let key = key_from_code(code.into());
            Some(EventType::KeyRelease(key))
        }
        xlib::ButtonPress => match code {
            1 => Some(EventType::ButtonPress(Button::Left)),
            2 => Some(EventType::ButtonPress(Button::Middle)),
            3 => Some(EventType::ButtonPress(Button::Right)),
            4 => Some(EventType::Wheel {
                delta_y: 1,
                delta_x: 0,
            }),
            5 => Some(EventType::Wheel {
                delta_y: -1,
                delta_x: 0,
            }),
            6 => Some(EventType::Wheel {
                delta_y: 0,
                delta_x: -1,
            }),
            7 => Some(EventType::Wheel {
                delta_y: 0,
                delta_x: 1,
            }),
            code => Some(EventType::ButtonPress(Button::Unknown(code))),
        },
        xlib::ButtonRelease => match code {
            1 => Some(EventType::ButtonRelease(Button::Left)),
            2 => Some(EventType::ButtonRelease(Button::Middle)),
            3 => Some(EventType::ButtonRelease(Button::Right)),
            4 | 5 => None,
            _ => Some(EventType::ButtonRelease(Button::Unknown(code))),
        },
        xlib::MotionNotify => Some(EventType::MouseMove { x, y }),
        _ => None,
    }
}

pub fn convert(
    keyboard: &mut Option<Keyboard>,
    code: c_uint,
    type_: c_int,
    x: f64,
    y: f64,
) -> Option<Event> {
    let event_type = convert_event(code as c_uchar, type_, x, y)?;
    let kb: &mut Keyboard = (*keyboard).as_mut()?;
    let name = kb.add(&event_type);
    Some(Event {
        event_type,
        time: SystemTime::now(),
        name,
    })
}

pub struct Display {
    display: *mut xlib::Display,
}

impl Display {
    pub fn new() -> Option<Display> {
        unsafe {
            let display = xlib::XOpenDisplay(null());
            if display.is_null() {
                return None;
            }
            Some(Display { display })
        }
    }

    pub fn get_size(&self) -> Option<(u64, u64)> {
        unsafe {
            let screen_ptr = xlib::XDefaultScreenOfDisplay(self.display);
            if screen_ptr.is_null() {
                return None;
            }
            let screen = *screen_ptr;
            Some((
                screen.width.try_into().ok()?,
                screen.height.try_into().ok()?,
            ))
        }
    }

    #[cfg(feature = "unstable_grab")]
    pub fn get_mouse_pos(&self) -> Option<(u64, u64)> {
        unsafe {
            let root_window = xlib::XRootWindow(self.display, 0);
            let mut root_x = 0;
            let mut root_y = 0;
            let mut x = 0;
            let mut y = 0;
            let mut root = 0;
            let mut child = 0;
            let mut mask = 0;
            let _screen_ptr = xlib::XQueryPointer(
                self.display,
                root_window,
                &mut root,
                &mut child,
                &mut root_x,
                &mut root_y,
                &mut x,
                &mut y,
                &mut mask,
            );
            Some((root_x.try_into().ok()?, root_y.try_into().ok()?))
        }
    }
}
impl Drop for Display {
    fn drop(&mut self) {
        unsafe {
            xlib::XCloseDisplay(self.display);
        }
    }
}