48 lines
1.1 KiB
JavaScript
48 lines
1.1 KiB
JavaScript
// For convenience, periodically re-compute the current time. This ensures freshness of
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// displays like "x minutes ago" without having to jump through a lot of hoops.
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import { scheduleIdleTask } from '../../_utils/scheduleIdleTask'
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import lifecycle from 'page-lifecycle/dist/lifecycle.mjs'
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const POLL_INTERVAL = 10000
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export function nowObservers (store) {
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let interval
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function updateNow () {
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store.set({ now: Date.now() })
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}
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function startPolling () {
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interval = setInterval(() => scheduleIdleTask(updateNow), POLL_INTERVAL)
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}
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function stopPolling () {
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if (interval) {
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clearInterval(interval)
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interval = null
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}
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}
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function restartPolling () {
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stopPolling()
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scheduleIdleTask(updateNow)
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startPolling()
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}
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updateNow()
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if (process.browser) {
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startPolling()
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lifecycle.addEventListener('statechange', e => {
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if (e.newState === 'passive') {
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console.log('stopping Date.now() observer...')
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stopPolling()
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} else if (e.newState === 'active') {
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console.log('restarting Date.now() observer...')
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restartPolling()
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}
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})
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}
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}
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