forked from mirrors/gecko-dev
1c1210fbba
We can only borrow `JS<T>` from rooted things, so it's safe to deref it. The only types that provide mutable `JS<T>` things are `MutHeap<JS<T>>` and `MutNullableHeap<JS<T>>`, which don't actually expose that they contain `JS<T>` values. Source-Repo: https://github.com/servo/servo Source-Revision: 1a376aa75d5de8781b17a673850860f8afd2c28f
58 lines
2.2 KiB
Rust
58 lines
2.2 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use dom::bindings::codegen::Bindings::PerformanceBinding;
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use dom::bindings::codegen::Bindings::PerformanceBinding::PerformanceMethods;
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use dom::bindings::global::GlobalRef;
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use dom::bindings::js::{JS, Root};
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use dom::bindings::num::Finite;
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use dom::bindings::utils::{Reflector, reflect_dom_object};
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use dom::performancetiming::PerformanceTiming;
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use dom::window::Window;
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use time;
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pub type DOMHighResTimeStamp = Finite<f64>;
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#[dom_struct]
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pub struct Performance {
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reflector_: Reflector,
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timing: JS<PerformanceTiming>,
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}
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impl Performance {
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fn new_inherited(window: &Window,
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navigation_start: u64,
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navigation_start_precise: f64) -> Performance {
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Performance {
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reflector_: Reflector::new(),
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timing: JS::from_rooted(&PerformanceTiming::new(window,
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navigation_start,
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navigation_start_precise)),
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}
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}
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pub fn new(window: &Window,
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navigation_start: u64,
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navigation_start_precise: f64) -> Root<Performance> {
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reflect_dom_object(box Performance::new_inherited(window,
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navigation_start,
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navigation_start_precise),
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GlobalRef::Window(window),
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PerformanceBinding::Wrap)
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}
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}
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impl PerformanceMethods for Performance {
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// https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/NavigationTiming/Overview.html#performance-timing-attribute
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fn Timing(&self) -> Root<PerformanceTiming> {
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self.timing.root()
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}
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// https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/HighResolutionTime/Overview.html#dom-performance-now
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fn Now(&self) -> DOMHighResTimeStamp {
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let navStart = self.timing.NavigationStartPrecise();
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let now = (time::precise_time_ns() as f64 - navStart) / 1000000 as f64;
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Finite::wrap(now)
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}
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}
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