非同步数组枚举回调
此腳本不應該直接安裝，它是一個供其他腳本使用的函式庫。欲使用本函式庫，請在腳本 metadata 寫上： // @require https://update.cn-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;
}
};