librenms-librenms/lib/gridster/src/utils.js

(function (window, undefined) {
	'use strict';
	/* Delay, debounce and throttle functions taken from underscore.js
	 *
	 * Copyright (c) 2009-2013 Jeremy Ashkenas, DocumentCloud and
	 * Investigative Reporters & Editors
	 *
	 * Permission is hereby granted, free of charge, to any person
	 * obtaining a copy of this software and associated documentation
	 * files (the "Software"), to deal in the Software without
	 * restriction, including without limitation the rights to use,
	 * copy, modify, merge, publish, distribute, sublicense, and/or sell
	 * copies of the Software, and to permit persons to whom the
	 * Software is furnished to do so, subject to the following
	 * conditions:
	 *
	 * The above copyright notice and this permission notice shall be
	 * included in all copies or substantial portions of the Software.
	 *
	 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
	 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
	 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
	 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	 * OTHER DEALINGS IN THE SOFTWARE.
	 */

	window.delay = function (func, wait) {
		var args = Array.prototype.slice.call(arguments, 2);
		return setTimeout(function () {
			return func.apply(null, args);
		}, wait);
	};

	window.debounce = function (func, wait, immediate) {
		var timeout;
		return function () {
			var context = this, args = arguments;
			var later = function () {
				timeout = null;
				if (!immediate) {
					func.apply(context, args);
				}
			};
			if (immediate && !timeout) {
				func.apply(context, args);
			}
			clearTimeout(timeout);
			timeout = setTimeout(later, wait);
		};
	};

	window.throttle = function (func, wait) {
		var context, args, timeout, throttling, more, result;
		var whenDone = debounce(
				function () {
					more = throttling = false;
				}, wait);
		return function () {
			context = this;
			args = arguments;
			var later = function () {
				timeout = null;
				if (more) {
					func.apply(context, args);
				}
				whenDone();
			};
			if (!timeout) {
				timeout = setTimeout(later, wait);
			}
			if (throttling) {
				more = true;
			} else {
				result = func.apply(context, args);
			}
			whenDone();
			throttling = true;
			return result;
		};
	};

})(window);