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use ffi;
use translate::*;
use std::mem;
use std::mem::transmute;
use ffi as glib_ffi;
use ffi::{gpointer, gboolean};
use MainContext;
use Source;
use SourceId;
use source::{CallbackGuard, Priority};
impl MainContext {
pub fn prepare(&self) -> (bool, i32) {
unsafe {
let mut priority = mem::uninitialized();
let res = from_glib(ffi::g_main_context_prepare(self.to_glib_none().0, &mut priority));
(res, priority)
}
}
pub fn find_source_by_id(&self, source_id: SourceId) -> Option<Source> {
unsafe {
from_glib_none(ffi::g_main_context_find_source_by_id(self.to_glib_none().0, source_id.to_glib()))
}
}
pub fn invoke<F>(&self, func: F)
where F: FnOnce() + Send + 'static {
self.invoke_with_priority(::PRIORITY_DEFAULT_IDLE, func);
}
pub fn invoke_with_priority<F>(&self, priority: Priority, func: F)
where F: FnOnce() + Send + 'static {
unsafe {
let func = Box::into_raw(Box::new(Some(Box::new(func))));
glib_ffi::g_main_context_invoke_full(self.to_glib_none().0, priority.to_glib(), Some(trampoline::<F>),
func as gpointer, Some(destroy_closure::<F>))
}
}
}
#[cfg_attr(feature = "cargo-clippy", allow(transmute_ptr_to_ref))]
unsafe extern "C" fn trampoline<F: FnOnce() + Send + 'static>(func: gpointer) -> gboolean {
let _guard = CallbackGuard::new();
let func: &mut Option<Box<F>> = transmute(func);
let func = func.take().expect("MainContext::invoke() closure called multiple times");
func();
glib_ffi::G_SOURCE_REMOVE
}
unsafe extern "C" fn destroy_closure<F: FnOnce() + Send + 'static>(ptr: gpointer) {
let _guard = CallbackGuard::new();
Box::<Option<Box<F>>>::from_raw(ptr as *mut _);
}
#[cfg(test)]
mod tests {
use super::*;
use std::thread;
#[test]
fn test_invoke() {
let l = ::MainLoop::new(None, false);
let c = MainContext::default().unwrap();
let l_clone = l.clone();
thread::spawn(move || {
c.invoke(move || l_clone.quit());
});
l.run();
}
}