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/** * Copyright (c) 2017 ~ present NAVER Corp. * billboard.js project is licensed under the MIT license */import {d3Transition} from "../../types/types";import {window} from "./browser";import {isArray, isTabVisible} from "./util";
const {setTimeout, clearTimeout} = window;
/** * Generate resize queue function * @returns {Fucntion} * @private */export function generateResize() {	const fn: any[] = [];	let timeout;
	const callResizeFn = function() {		// Delay all resize functions call, to prevent unintended excessive call from resize event		callResizeFn.clear();
		timeout = setTimeout(() => {			fn.forEach((f: Function) => f());		}, 200);	};
	callResizeFn.clear = () => {		if (timeout) {			clearTimeout(timeout);			timeout = null;		}	};
	callResizeFn.add = f => fn.push(f);	callResizeFn.remove = f => fn.splice(fn.indexOf(f), 1);
	return callResizeFn;}
type Transition = boolean | d3Transition;
/** * Generate transition queue function * @returns {Function} * @private */export function generateWait() {	let transitionsToWait: Transition[] = [];
	// 'f' is called as selection.call(f, ...);	const f = function(selection: d3Transition, callback: Function) {		let timer;
		/**		 * Check if transition is complete		 * @private		 */		function loop() {			let done = 0;
			for (let i = 0, t; (t = transitionsToWait[i]); i++) {				if (t === true || t.empty?.()) {					done++;					continue;				}
				// when tab isn't visible exit loop				if (isTabVisible() === false) {					done = transitionsToWait.length;					break;				}
				try {					t.transition();				} catch (e) {					done++;				}			}
			timer && clearTimeout(timer);
			if (done === transitionsToWait.length) {				callback?.();			} else {				timer = setTimeout(loop, 50);			}		}
		loop();	};
	f.add = function(t: Transition | Transition[]) {		isArray(t) ?			(transitionsToWait = transitionsToWait.concat(t)) :			transitionsToWait.push(t);	};
	return f;}