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use std::any::Any;
use std::io::{Result as IoResult, Error as IoError};
use std::io::Write;
use std::ops::{Deref, DerefMut};
use std::os::raw::{c_void, c_int};
use std::sync::Arc;
use std::sync::atomic::AtomicBool;
use wayland_sys::common::{wl_message, wl_argument};
use wayland_sys::server::*;
use {Resource, Handler, Client};
type ResourceUserData = (*mut EventLoopHandle, Arc<AtomicBool>);
pub struct Global {
ptr: *mut wl_global,
_data: Box<(*mut c_void, *mut EventLoopHandle)>
}
impl Global {
pub fn destroy(self) {
unsafe {
ffi_dispatch!(WAYLAND_SERVER_HANDLE, wl_global_destroy, self.ptr);
}
}
}
pub trait GlobalHandler<R: Resource> {
fn bind(&mut self, evqh: &mut EventLoopHandle, client: &Client, global: R);
}
pub struct EventLoopHandle {
handlers: Vec<Box<Any>>,
keep_going: bool,
}
impl EventLoopHandle {
pub fn register<R: Resource, H: Handler<R> + Any + 'static>(&mut self, resource: &R, handler_id: usize) {
let h = self.handlers[handler_id].downcast_ref::<H>()
.expect("Handler type do not match.");
unsafe {
let data: *mut ResourceUserData = ffi_dispatch!(
WAYLAND_SERVER_HANDLE,
wl_resource_get_user_data,
resource.ptr()
) as *mut _;
(&mut *data).0 = self as *const _ as *mut _;
ffi_dispatch!(
WAYLAND_SERVER_HANDLE,
wl_resource_set_dispatcher,
resource.ptr(),
dispatch_func::<R,H>,
h as *const _ as *const c_void,
data as *mut c_void,
resource_destroy
);
}
}
pub fn add_handler<H: Any + 'static>(&mut self, handler: H) -> usize {
self.handlers.push(Box::new(handler) as Box<Any>);
self.handlers.len() - 1
}
pub fn stop_loop(&mut self) {
self.keep_going = false;
}
}
pub struct StateGuard<'evq> {
evq: &'evq mut EventLoop
}
impl<'evq> StateGuard<'evq> {
pub fn get_handler<H: Any + 'static>(&self, handler_id: usize) -> &H {
self.evq.handle.handlers[handler_id].downcast_ref::<H>()
.expect("Handler type do not match.")
}
pub fn get_mut_handler<H: Any + 'static>(&mut self, handler_id: usize) -> &mut H {
self.evq.handle.handlers[handler_id].downcast_mut::<H>()
.expect("Handler type do not match.")
}
}
pub unsafe fn create_event_loop(ptr: *mut wl_event_loop, display: Option<*mut wl_display>) -> EventLoop {
EventLoop {
ptr: ptr,
display: display,
handle: Box::new(EventLoopHandle { handlers: Vec::new(), keep_going: false })
}
}
pub struct EventLoop {
ptr: *mut wl_event_loop,
display: Option<*mut wl_display>,
handle: Box<EventLoopHandle>
}
impl EventLoop {
pub fn dispatch(&mut self, timeout: Option<u32>) -> IoResult<u32> {
use std::i32;
let timeout = match timeout {
None => -1,
Some(v) if v >= (i32::MAX as u32) => i32::MAX,
Some(v) => (v as i32)
};
let ret = unsafe { ffi_dispatch!(
WAYLAND_SERVER_HANDLE,
wl_event_loop_dispatch,
self.ptr,
timeout
)};
if ret >= 0 {
Ok(ret as u32)
} else {
Err(IoError::last_os_error())
}
}
pub fn run(&mut self) -> IoResult<()> {
self.handle.keep_going = true;
loop {
if let Some(display) = self.display {
unsafe { ffi_dispatch!(
WAYLAND_SERVER_HANDLE,
wl_display_flush_clients,
display
)};
}
try!(self.dispatch(None));
if !self.handle.keep_going {
return Ok(())
}
}
}
pub fn register_global<R: Resource, H: GlobalHandler<R> + Any + 'static>(&mut self, handler_id: usize, version: i32) -> Global {
let h = self.handle.handlers[handler_id].downcast_ref::<H>()
.expect("Handler type do not match.");
let display = self.display.expect("Globals can only be registered on an event loop associated with a display.");
let data = Box::new((h as *const _ as *mut c_void, &*self.handle as *const _ as *mut EventLoopHandle));
let ptr = unsafe {
ffi_dispatch!(
WAYLAND_SERVER_HANDLE,
wl_global_create,
display,
R::interface_ptr(),
version,
&*data as *const (*mut c_void, *mut EventLoopHandle) as *mut _,
global_bind::<R,H>
)
};
Global {
ptr: ptr,
_data: data
}
}
pub fn state(&mut self) -> StateGuard {
StateGuard { evq: self }
}
}
impl Deref for EventLoop {
type Target = EventLoopHandle;
fn deref(&self) -> &EventLoopHandle {
&*self.handle
}
}
impl DerefMut for EventLoop {
fn deref_mut(&mut self) -> &mut EventLoopHandle {
&mut *self.handle
}
}
unsafe extern "C" fn dispatch_func<R: Resource, H: Handler<R>>(
handler: *const c_void,
resource: *mut c_void,
opcode: u32,
_msg: *const wl_message,
args: *const wl_argument
) -> c_int {
let ret = ::std::panic::catch_unwind(move || {
let handler = &mut *(handler as *const H as *mut H);
let resource = R::from_ptr_initialized(resource as *mut wl_resource);
let data = &mut *(ffi_dispatch!(
WAYLAND_SERVER_HANDLE, wl_resource_get_user_data, resource.ptr()
) as *mut ResourceUserData);
let evqhandle = &mut *data.0;
let client = Client::from_ptr(ffi_dispatch!(
WAYLAND_SERVER_HANDLE, wl_resource_get_client, resource.ptr()
));
handler.message(evqhandle, &client, &resource, opcode, args)
});
match ret {
Ok(Ok(())) => return 0,
Ok(Err(())) => {
let _ = write!(
::std::io::stderr(),
"[wayland-server error] Attempted to dispatch unknown opcode {} for {}, aborting.",
opcode, R::interface_name()
);
::libc::abort();
}
Err(_) => {
let _ = write!(
::std::io::stderr(),
"[wayland-server error] A handler for {} panicked, aborting.",
R::interface_name()
);
::libc::abort();
}
}
}
unsafe extern "C" fn global_bind<R: Resource, H: GlobalHandler<R>>(
client: *mut wl_client,
data: *mut c_void,
version: u32,
id: u32
) {
let ret = ::std::panic::catch_unwind(move || {
let data = &*(data as *const (*mut H, *mut EventLoopHandle));
let handler = &mut *data.0;
let evqhandle = &mut *data.1;
let client = Client::from_ptr(client);
let ptr = ffi_dispatch!(
WAYLAND_SERVER_HANDLE,
wl_resource_create,
client.ptr(),
R::interface_ptr(),
version as i32,
id
);
let resource = R::from_ptr_new(ptr as *mut wl_resource);
handler.bind(evqhandle, &client, resource)
});
match ret {
Ok(()) => (),
Err(_) => {
let _ = write!(
::std::io::stderr(),
"[wayland-server error] A global handler for {} panicked, aborting.",
R::interface_name()
);
::libc::abort();
}
}
}
unsafe extern "C" fn resource_destroy(_resource: *mut wl_resource) {
}
#[macro_export]
macro_rules! declare_handler(
($handler_struct: ty, $handler_trait: path, $handled_type: ty) => {
unsafe impl $crate::Handler<$handled_type> for $handler_struct {
unsafe fn message(&mut self, evq: &mut $crate::EventLoopHandle, client: &$crate::CLient, proxy: &$handled_type, opcode: u32, args: *const $crate::sys::wl_argument) -> Result<(),()> {
<$handler_struct as $handler_trait>::__message(self, evq, client, proxy, opcode, args)
}
}
}
);