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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 http://mozilla.org/MPL/2.0/. */
use dom::bindings::callback::ExceptionHandling;
use dom::bindings::cell::DOMRefCell;
use dom::bindings::codegen::Bindings::PerformanceBinding::PerformanceEntryList as DOMPerformanceEntryList;
use dom::bindings::codegen::Bindings::PerformanceObserverBinding;
use dom::bindings::codegen::Bindings::PerformanceObserverBinding::PerformanceObserverCallback;
use dom::bindings::codegen::Bindings::PerformanceObserverBinding::PerformanceObserverInit;
use dom::bindings::codegen::Bindings::PerformanceObserverBinding::PerformanceObserverMethods;
use dom::bindings::codegen::Bindings::WindowBinding::WindowBinding::WindowMethods;
use dom::bindings::error::{Error, Fallible};
use dom::bindings::js::Root;
use dom::bindings::reflector::{DomObject, Reflector, reflect_dom_object};
use dom::bindings::str::DOMString;
use dom::globalscope::GlobalScope;
use dom::performance::PerformanceEntryList;
use dom::performanceentry::PerformanceEntry;
use dom::performanceobserverentrylist::PerformanceObserverEntryList;
use dom_struct::dom_struct;
use std::rc::Rc;
/// List of allowed performance entry types.
const VALID_ENTRY_TYPES: &'static [&'static str] = &[
// "mark", XXX User Timing API
// "measure", XXX User Timing API
// "resource", XXX Resource Timing API
// "server", XXX Server Timing API
"paint", // Paint Timing API
];
#[dom_struct]
pub struct PerformanceObserver {
reflector_: Reflector,
#[ignore_heap_size_of = "can't measure Rc values"]
callback: Rc<PerformanceObserverCallback>,
entries: DOMRefCell<DOMPerformanceEntryList>,
}
impl PerformanceObserver {
fn new_inherited(callback: Rc<PerformanceObserverCallback>,
entries: DOMRefCell<DOMPerformanceEntryList>)
-> PerformanceObserver {
PerformanceObserver {
reflector_: Reflector::new(),
callback,
entries,
}
}
#[allow(unrooted_must_root)]
pub fn new(global: &GlobalScope,
callback: Rc<PerformanceObserverCallback>,
entries: DOMPerformanceEntryList)
-> Root<PerformanceObserver> {
let observer = PerformanceObserver::new_inherited(callback, DOMRefCell::new(entries));
reflect_dom_object(box observer, global, PerformanceObserverBinding::Wrap)
}
pub fn Constructor(global: &GlobalScope, callback: Rc<PerformanceObserverCallback>)
-> Fallible<Root<PerformanceObserver>> {
Ok(PerformanceObserver::new(global, callback, Vec::new()))
}
/// Buffer a new performance entry.
pub fn queue_entry(&self, entry: &PerformanceEntry) {
self.entries.borrow_mut().push(Root::from_ref(entry));
}
/// Trigger performance observer callback with the list of performance entries
/// buffered since the last callback call.
pub fn notify(&self) {
let entries = self.entries.borrow();
if entries.is_empty() {
return;
}
let mut entries = entries.clone();
let global = self.global();
let entry_list = PerformanceEntryList::new(entries.drain(..).collect());
let observer_entry_list = PerformanceObserverEntryList::new(&global, entry_list);
let _ = self.callback.Call__(&observer_entry_list, self, ExceptionHandling::Report);
}
pub fn callback(&self) -> Rc<PerformanceObserverCallback> {
self.callback.clone()
}
pub fn entries(&self) -> DOMPerformanceEntryList {
self.entries.borrow().clone()
}
}
impl PerformanceObserverMethods for PerformanceObserver {
// https://w3c.github.io/performance-timeline/#dom-performanceobserver-observe()
fn Observe(&self, options: &PerformanceObserverInit) -> Fallible<()> {
// Make sure the client is asking to observe events from allowed entry types.
let entry_types = options.entryTypes.iter()
.filter(|e| VALID_ENTRY_TYPES.contains(&e.as_ref()))
.map(|e| e.clone())
.collect::<Vec<DOMString>>();
// There must be at least one valid entry type.
if entry_types.is_empty() {
return Err((Error::Type("entryTypes cannot be empty".to_string())));
}
let performance = self.global().as_window().Performance();
performance.add_observer(self, entry_types);
Ok(())
}
// https://w3c.github.io/performance-timeline/#dom-performanceobserver-disconnect()
fn Disconnect(&self) {
self.global().as_window().Performance().remove_observer(self);
self.entries.borrow_mut().clear();
}
}
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