49 lines
1.1 KiB
JavaScript
49 lines
1.1 KiB
JavaScript
import { lifecycle } from './lifecycle.js'
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/**
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* Schedule a callback, similar to setInterval but disables itself when the page is not active to save battery/CPU.
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* @param callback - callback to run
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* @param delay - how many milliseconds between callback calls
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* @param runOnActive - whether to run immediately when the page switches to an "active" state
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*/
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export function scheduleInterval (callback, delay, runOnActive) {
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let interval
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function startPolling () {
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interval = setInterval(callback, delay)
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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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if (runOnActive) {
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try {
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callback()
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} catch (e) {
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console.warn(e)
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}
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}
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startPolling()
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}
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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('pausing interval...')
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stopPolling()
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} else if (e.newState === 'active') {
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console.log('restarting interval...')
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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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