/* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
// setImmediate is only defined when running in the worker thread /* globals setImmediate */
/** * From underscore's `_.throttle` * http://underscorejs.org * (c) 2009-2014 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors * Underscore may be freely distributed under the MIT license. * * Returns a function, that, when invoked, will only be triggered at most once during a * given window of time. The throttled function will run as much as it can, without ever * going more than once per wait duration. * * @param {Function} func * The function to throttle * @param {number} wait * The wait period * @param {Object} scope * The scope to use for func * @return {Function} The throttled function
*/ function throttle(func, wait, scope) {
let args, result;
let timeout = null;
let previous = 0;
const later = function () {
previous = Date.now();
timeout = null;
result = func.apply(scope, args);
args = null;
};
const throttledFunction = function () { const now = Date.now(); const remaining = wait - (now - previous);
args = arguments; if (remaining <= 0) { if (!isWorker) {
clearTimeout(timeout);
}
timeout = null;
previous = now;
result = func.apply(scope, args);
args = null;
} elseif (!timeout) { // On worker thread, we don't have access to privileged setTimeout/clearTimeout // API which wouldn't be frozen when the worker is paused. So rely on the privileged // setImmediate function which executes on the next event loop. if (isWorker) {
setImmediate(later);
timeout = true;
} else {
timeout = setTimeout(later, remaining);
}
} return result;
};
function cancel() { if (timeout) { if (!isWorker) {
clearTimeout(timeout);
}
timeout = null;
}
previous = 0;
args = undefined;
result = undefined;
}
function flush() { if (!timeout) { return result;
}
previous = 0; return throttledFunction();
}
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