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clock.js
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clock.js
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class Clock {
static secs() {
return Math.round(new Date().getTime() / 1000);
}
constructor(secs, opts) {
this.left = secs;
this._target = Clock.secs() + secs;
this._tick();
this._interval = setInterval(this._tick.bind(this), 1000 / 12);
}
stop() {
clearInterval(this._interval);
}
done() {
this.stop();
if (this.onDone) {
this.onDone(this);
}
}
_tick() {
const left = this._target - Clock.secs();
const didChange = left !== this.left;
this.left = left;
if (this.onTick) {
this.onTick(this);
}
if (this.onChange && didChange) {
this.onChange(this);
}
if (this.left > 0) {
return;
}
this.done();
}
}
module.exports = Clock;