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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/. */
#![deny(missing_docs)]
//! A timeline module, used to specify an `AnimationTimeline` which determines
//! the time used for synchronizing animations in the script thread.
use std::time::{SystemTime, UNIX_EPOCH};
use jstraceable_derive::JSTraceable;
/// A `AnimationTimeline` which is used to synchronize animations during the script
/// event loop.
#[derive(Clone, Copy, Debug, JSTraceable, MallocSizeOf)]
pub(crate) struct AnimationTimeline {
current_value: f64,
}
impl AnimationTimeline {
/// Creates a new "normal" timeline, i.e., a "Current" mode timer.
#[inline]
pub fn new() -> Self {
Self {
current_value: SystemTime::now()
.duration_since(UNIX_EPOCH)
.unwrap_or_default()
.as_secs_f64(),
}
}
/// Creates a new "test mode" timeline, with initial time 0.
#[inline]
pub fn new_for_testing() -> Self {
Self { current_value: 0. }
}
/// Returns the current value of the timeline in seconds.
pub fn current_value(&self) -> f64 {
self.current_value
}
/// Updates the value of the `AnimationTimeline` to the current clock time.
pub fn update(&mut self) {
self.current_value = SystemTime::now()
.duration_since(UNIX_EPOCH)
.unwrap_or_default()
.as_secs_f64();
}
/// Increments the current value of the timeline by a specific number of seconds.
/// This is used for testing.
pub fn advance_specific(&mut self, by: f64) {
self.current_value += by;
}
}
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