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// Copyright 2017 Lyndon Brown
//
// This file is part of the PulseAudio Rust language binding.
//
// Licensed under the MIT license or the Apache license (version 2.0), at your option. You may not
// copy, modify, or distribute this file except in compliance with said license. You can find copies
// of these licenses either in the LICENSE-MIT and LICENSE-APACHE files, or alternatively at
// <http://opensource.org/licenses/MIT> and <http://www.apache.org/licenses/LICENSE-2.0>
// respectively.
//
// Portions of documentation are copied from the LGPL 2.1+ licensed PulseAudio C headers on a
// fair-use basis, as discussed in the overall project readme (available in the git repository).
//! Main loop deferred events.
use std::os::raw::c_void;
use std::rc::Rc;
use crate::mainloop::api::{MainloopApi, MainloopInnerType};
use crate::callbacks::MultiUseCallback;
pub use capi::pa_defer_event as DeferEventInternal;
/// A deferred event source.
pub struct DeferEvent<T>
where T: MainloopInnerType
{
/// Internal object pointer
ptr: *mut DeferEventInternal,
/// Source mainloop.
owner: Rc<T>,
/// Saved callback closure, for later destruction.
_saved_cb: EventCb,
}
/// A reference to a deferred event source, provided to the callback, allowing modification within
/// the callback itself.
pub struct DeferEventRef<T: 'static>
where T: MainloopInnerType
{
/// Internal object pointer
ptr: *mut DeferEventInternal,
/// Source mainloop.
owner: Rc<T>,
}
pub(crate) type EventCb = MultiUseCallback<dyn FnMut(*mut DeferEventInternal),
extern "C" fn(a: *const MainloopApi, e: *mut DeferEventInternal, userdata: *mut c_void)>;
impl<T> DeferEvent<T>
where T: MainloopInnerType
{
#[inline]
pub(crate) fn from_raw(ptr: *mut DeferEventInternal, mainloop_inner: Rc<T>, callback: EventCb)
-> Self
{
assert_eq!(false, ptr.is_null());
Self { ptr: ptr, owner: mainloop_inner, _saved_cb: callback }
}
/// Enables this event source temporarily.
#[inline]
pub fn enable(&mut self) {
let fn_ptr = (*self.owner).get_api().defer_enable.unwrap();
fn_ptr(self.ptr, 1);
}
/// Disables this event source temporarily.
#[inline]
pub fn disable(&mut self) {
let fn_ptr = (*self.owner).get_api().defer_enable.unwrap();
fn_ptr(self.ptr, 0);
}
}
impl<T> DeferEventRef<T>
where T: MainloopInnerType
{
#[inline]
pub(crate) fn from_raw(ptr: *mut DeferEventInternal, mainloop_inner: Rc<T>) -> Self {
assert_eq!(false, ptr.is_null());
Self { ptr: ptr, owner: mainloop_inner }
}
/// Enables this event source temporarily.
#[inline]
pub fn enable(&mut self) {
let fn_ptr = (*self.owner).get_api().defer_enable.unwrap();
fn_ptr(self.ptr, 1);
}
/// Disables this event source temporarily.
#[inline]
pub fn disable(&mut self) {
let fn_ptr = (*self.owner).get_api().defer_enable.unwrap();
fn_ptr(self.ptr, 0);
}
}
impl<T> Drop for DeferEvent<T>
where T: MainloopInnerType
{
fn drop(&mut self) {
let fn_ptr = (*self.owner).get_api().defer_free.unwrap();
fn_ptr(self.ptr);
}
}
/// Proxy for the event callback.
///
/// Warning: This is for multi-use cases! It does **not** destroy the actual closure callback, which
/// must be accomplished separately to avoid a memory leak.
pub(crate)
extern "C"
fn event_cb_proxy(_: *const MainloopApi, e: *mut DeferEventInternal, userdata: *mut c_void) {
let _ = std::panic::catch_unwind(|| {
let callback = EventCb::get_callback(userdata);
(callback)(e);
});
}