46 lines
1.2 KiB
JavaScript
46 lines
1.2 KiB
JavaScript
function adaptiveSetInterval(fn, runNow) {
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// unconditionally run every minute
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setInterval(fn, 60000);
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// scheduleRun() keeps calling fn and decreasing quota
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// every 3 seconds, until quota runs out.
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var quota = 0;
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var scheduledId = null;
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function scheduleRun() {
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if (quota > 0) {
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quota -= 1;
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clearTimeout(scheduledId);
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scheduledId = setTimeout(scheduleRun, 3000);
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fn();
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}
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}
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document.addEventListener("visibilitychange", function() {
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if (document.visibilityState == "visible") {
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// tab becomes visible: reset quota
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if (quota == 0) {
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quota = 20;
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scheduleRun();
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} else {
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quota = 20;
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}
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} else {
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// lost visibility, clear quota
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quota = 0;
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}
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});
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// user moves mouse: reset quota
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document.addEventListener("mousemove", function() {
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if (quota == 0) {
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quota = 20;
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scheduleRun();
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} else {
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quota = 20;
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}
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});
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quota = 20;
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scheduledId = setTimeout(scheduleRun, runNow ? 1 : 3000);
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}
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