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extern crate mio; extern crate promising_future; extern crate x11_dl; mod key_code; pub use self::key_code::KeyCode; use self::mio::unix::EventedFd; use self::mio::{Events, Poll, PollOpt, Ready, Registration, SetReadiness, Token}; use self::promising_future::{future_promise, Promise}; use self::x11_dl::xlib::{ Display, GrabModeAsync, KeyPress, KeyPressMask, Mod2Mask, XErrorEvent, XKeyEvent, Xlib, }; use std::collections::hash_map::{Entry, HashMap}; use std::os::raw::{c_int, c_uint, c_ulong}; use std::sync::mpsc::{channel, Sender}; use std::thread::{self, JoinHandle}; use std::{mem, ptr}; quick_error! { #[derive(Debug)] pub enum Error { NoXLib {} OpenXServerConnection {} EPoll {} ThreadStopped {} AlreadyRegistered {} NotRegistered {} } } pub type Result<T> = ::std::result::Result<T, Error>; enum Message { Register(KeyCode, Box<FnMut() + Send + 'static>, Promise<Result<()>>), Unregister(KeyCode, Promise<Result<()>>), End, } pub struct Hook { sender: Sender<Message>, ping: SetReadiness, _registration: Registration, join_handle: Option<JoinHandle<Result<()>>>, } impl Drop for Hook { fn drop(&mut self) { self.sender.send(Message::End).ok(); self.ping.set_readiness(Ready::readable()).ok(); if let Some(handle) = self.join_handle.take() { handle.join().ok(); } } } unsafe fn unregister(xlib: &Xlib, display: *mut Display, window: c_ulong, code: c_uint) { (xlib.XUngrabKey)(display, code as _, 0, window); (xlib.XUngrabKey)(display, code as _, Mod2Mask, window); } unsafe extern "C" fn handle_error(_: *mut Display, _: *mut XErrorEvent) -> c_int { 0 } impl Hook { pub fn new() -> Result<Self> { unsafe { let (sender, receiver) = channel(); let xlib = Xlib::open().map_err(|_| Error::NoXLib)?; (xlib.XSetErrorHandler)(Some(handle_error)); let display = (xlib.XOpenDisplay)(ptr::null()); if display.is_null() { return Err(Error::OpenXServerConnection); } let window = (xlib.XDefaultRootWindow)(display); (xlib.XSelectInput)(display, window, KeyPressMask); let fd = (xlib.XConnectionNumber)(display); let poll = Poll::new().map_err(|_| Error::EPoll)?; let (registration, ping) = Registration::new2(); const X_TOKEN: Token = Token(0); const PING_TOKEN: Token = Token(1); poll.register( &EventedFd(&fd), X_TOKEN, Ready::readable() | Ready::writable(), PollOpt::edge(), ).map_err(|_| Error::EPoll)?; poll.register( ®istration, PING_TOKEN, Ready::readable(), PollOpt::edge(), ).map_err(|_| Error::EPoll)?; struct XData(Xlib, *mut Display, c_ulong); unsafe impl Send for XData {} let xdata = XData(xlib, display, window); let join_handle = thread::spawn(move || -> Result<()> { let XData(xlib, display, window) = xdata; let mut result = Ok(()); let mut events = Events::with_capacity(1024); let mut event = mem::uninitialized(); let mut hotkeys = HashMap::new(); 'event_loop: loop { if poll.poll(&mut events, None).is_err() { result = Err(Error::EPoll); break 'event_loop; } for mio_event in &events { if mio_event.token() == PING_TOKEN { for message in receiver.try_iter() { match message { Message::Register(key, callback, promise) => { let code = (xlib.XKeysymToKeycode)(display, key as _) as c_uint; if let Entry::Vacant(vacant) = hotkeys.entry(code) { (xlib.XGrabKey)( display, code as _, 0, window, false as _, GrabModeAsync, GrabModeAsync, ); (xlib.XGrabKey)( display, code as _, Mod2Mask, window, false as _, GrabModeAsync, GrabModeAsync, ); vacant.insert(callback); promise.set(Ok(())); } else { promise.set(Err(Error::AlreadyRegistered)); } } Message::Unregister(key, promise) => { let code = (xlib.XKeysymToKeycode)(display, key as _) as c_uint; if hotkeys.remove(&code).is_some() { unregister(&xlib, display, window, code); promise.set(Ok(())); } else { promise.set(Err(Error::NotRegistered)); } } Message::End => { break 'event_loop; } } } } else if mio_event.token() == X_TOKEN { while (xlib.XPending)(display) != 0 { (xlib.XNextEvent)(display, &mut event); if event.get_type() == KeyPress { let event: &XKeyEvent = event.as_ref(); if let Some(callback) = hotkeys.get_mut(&event.keycode) { callback(); } } } } } } for (code, _) in hotkeys { unregister(&xlib, display, window, code); } (xlib.XCloseDisplay)(display); result }); Ok(Hook { sender: sender, ping: ping, _registration: registration, join_handle: Some(join_handle), }) } } pub fn register<F>(&self, hotkey: KeyCode, callback: F) -> Result<()> where F: FnMut() + Send + 'static, { let (future, promise) = future_promise(); self.sender .send(Message::Register(hotkey, Box::new(callback), promise)) .map_err(|_| Error::ThreadStopped)?; self.ping .set_readiness(Ready::readable()) .map_err(|_| Error::ThreadStopped)?; future.value().ok_or(Error::ThreadStopped)? } pub fn unregister(&self, hotkey: KeyCode) -> Result<()> { let (future, promise) = future_promise(); self.sender .send(Message::Unregister(hotkey, promise)) .map_err(|_| Error::ThreadStopped)?; self.ping .set_readiness(Ready::readable()) .map_err(|_| Error::ThreadStopped)?; future.value().ok_or(Error::ThreadStopped)? } } #[test] fn test() { let hook = Hook::new().unwrap(); hook.register(KeyCode::NumPad0, || println!("A")).unwrap(); thread::sleep(::std::time::Duration::from_secs(5)); hook.unregister(KeyCode::NumPad0).unwrap(); hook.register(KeyCode::NumPad1, || println!("B")).unwrap(); thread::sleep(::std::time::Duration::from_secs(5)); }