☰

Interval Looper

非同步数组枚举回调

Dieses Skript sollte nicht direkt installiert werden. Es handelt sich hier um eine Bibliothek für andere Skripte, welche über folgenden Befehl in den Metadaten eines Skriptes eingebunden wird // @require https://update.greasyfork.org/scripts/3588/10916/Interval%20Looper.js 

// Interval Looper by Jixun:
// https://gist.github.com/JixunMoe/c77bb3936a68997fce22

var IntervalLoop = function (arrData, looper, delay) {
	if (!(this instanceof IntervalLoop))
		return new IntervalLoop (arrData, looper, delay);
 
	/**
	 * Status
	 * @type Number
	 * 0: 循环未开始
	 * 1: 正在循环
	 * 2: 循环结束
	 */
	this.status = 0;
	this.next = this._next.bind (this);
	this.index = 0;
 
	this.setDelay (delay || 50);
	this.data = (arrData instanceof Array) ? arrData : [];
	this.setLooper (looper);
};
 
IntervalLoop.prototype = {
	_getDelay: function () {
		if (!this.delay)
			return 50;
 
		if (this.delay.apply)
			return this.delay();
 
		return this.delay;
	},
	_next: function () {
		// 状态改为 进行中
		this.status = 1;
		if (this.index < this.data.length) {
			setTimeout (this.looper.bind(this, this.data[this.index]), this.delay);
			this.index ++;
			if (this.onProgress && this.onProgress.apply) {
				try {
					this.onProgress (this.index, this.data.length);
				} catch (e) {
					console.error ('Error while callback to `onProgress`');
					console.error (e);
				}
			}
		} else {
			this.status = 2;
			if (this.onComplete && this.onComplete.apply) {
				try {
					this.onComplete (this.data.length);
				} catch (e) {
					console.error ('Error while callback to `onComplete`');
					console.error (e);
				}
			}
		}
	},
	cleanup: function () {
		if (this.status == 2) {
			// 已经用过的数据就清掉。
			this.data.splice(0, this.index);
			this.index = 0;
			this.status = 0;
		}
 
		return this;
	},
	add: function () {
		if (arguments.length > 0) {
			// 将所有参数作为数据推入 this.data
			for (var i = 0; i<arguments.length; i++)
				this.data.push (arguments[i]);
 
			// 整个组已经完结，清理后自动继续
			if (this.status == 2)
				this.cleanup().next();
		}
 
		// 连锁
		return this;
	},
	setDelay: function (newDelay) {
		if (newDelay) this.delay = parseInt (newDelay);
		return this;
	},
	setLooper: function (fooCallback) {
		if (fooCallback && fooCallback.apply)
			this.looper = fooCallback.bind(this, this.next);
 
		return this;
	},
	loop: function () {
		if (this.status == 0)
			// 尚未启动, 从头开始
			this.next ();
 
		return this;
	}
};