You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
47 lines
1.2 KiB
47 lines
1.2 KiB
function adaptiveSetInterval(fn, runNow) {
|
|
// unconditionally run every minute
|
|
setInterval(fn, 60000);
|
|
|
|
// scheduleRun() keeps calling fn and decreasing quota
|
|
// every 3 seconds, until quota runs out.
|
|
var quota = 0;
|
|
var scheduledId = null;
|
|
function scheduleRun() {
|
|
if (quota > 0) {
|
|
quota -= 1;
|
|
clearTimeout(scheduledId);
|
|
scheduledId = setTimeout(scheduleRun, 3000);
|
|
fn();
|
|
}
|
|
}
|
|
|
|
document.addEventListener("visibilitychange", function() {
|
|
if (document.visibilityState == "visible") {
|
|
// tab becomes visible: reset quota
|
|
if (quota == 0) {
|
|
quota = 20;
|
|
scheduleRun();
|
|
} else {
|
|
quota = 20;
|
|
}
|
|
} else {
|
|
// lost visibility, clear quota
|
|
quota = 0;
|
|
}
|
|
});
|
|
|
|
// user moves mouse: reset quota
|
|
document.addEventListener("mousemove", function() {
|
|
if (quota == 0) {
|
|
quota = 20;
|
|
scheduleRun();
|
|
} else {
|
|
quota = 20;
|
|
}
|
|
});
|
|
|
|
if (runNow) {
|
|
quota = 20;
|
|
scheduleRun();
|
|
}
|
|
}
|