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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use crate::dom::bindings::conversions::DerivedFrom;
use crate::dom::bindings::refcounted::Trusted;
use crate::dom::bindings::reflector::DomObject;
use crate::dom::node::{window_from_node, Node};
use crate::task_source::TaskSource;
use ipc_channel::ipc;
use ipc_channel::ipc::IpcSender;
use ipc_channel::router::ROUTER;
use net_traits::image_cache::{ImageResponse, PendingImageResponse};
pub trait ImageCacheListener {
fn generation_id(&self) -> u32;
fn process_image_response(&self, response: ImageResponse);
}
pub fn generate_cache_listener_for_element<
T: ImageCacheListener + DerivedFrom<Node> + DomObject,
>(
elem: &T,
) -> IpcSender<PendingImageResponse> {
let trusted_node = Trusted::new(elem);
let (responder_sender, responder_receiver) = ipc::channel().unwrap();
let window = window_from_node(elem);
let (task_source, canceller) = window
.task_manager()
.networking_task_source_with_canceller();
let generation = elem.generation_id();
ROUTER.add_route(
responder_receiver.to_opaque(),
Box::new(move |message| {
let element = trusted_node.clone();
let image = message.to().unwrap();
debug!("Got image {:?}", image);
let _ = task_source.queue_with_canceller(
task!(process_image_response: move || {
let element = element.root();
// Ignore any image response for a previous request that has been discarded.
if generation == element.generation_id() {
element.process_image_response(image);
}
}),
&canceller,
);
}),
);
responder_sender
}
|
