/**
* _.debounce_b
*
* 1.0.1
*
* 2017-4-14
*
* 減輕高頻執行事件的執行頻率
*
* for backbone.js event
*
*/
////////////////////////////////////////////////////////////////////////////////
!(function (root) {
// 被引用了嗎
if (typeof _ === 'function') {
_.mixin({
debounce_b: debounce_
});
} else if (typeof module === 'object' && typeof module.exports === 'object') {
module.exports = debounce_;
} else {
return;
}
/* ====================================================================== */
/**
* @param {int} wait: 要超過多少時間間隔才執行
* @param {function} job: 要執行的事
*
*/
function debounce_(callback, wait) {
var d = new Debounce({
callback: callback,
waitTime: wait
});
return d.proxy_fn();
};
////////////////////////////////////////////////////////////////////////////
// core
function Debounce(option) {
var self = this;
this.waitTime = 5;
this._waitTime;
/* ---------------------------------- */
this._callback;
this.timeHandle;
this.dataList = [];
this.checkTime;
/* ================================================================== */
// 建構式
(function () {
(option !== Object(option)) && (option = {});
(typeof option.waitTime === 'number') && (this.waitTime = option.waitTime);
(typeof option.callback === 'function') && (this._callback = option.callback);
this.check();
}).call(this);
}
////////////////////////////////////////////////////////////////////////////
(function () {
/**
* 暴露在外的函式
* 外部呼叫此
*/
this.proxy_fn = function () {
return function (data) {
this._check(data);
}.bind(this);
};
/* ================================================================== */
this._check = function (data) {
// 記錄每次呼叫傳來的資料
this.dataList.push(data);
// 更新時間
this.checkTime = (new Date()).getTime();
this._bindTimeCheck();
};
/* ================================================================== */
this._bindTimeCheck = function () {
if (!this.timeHandle) {
console.log('no lock but will lock');
this._waitTime = this._waitTime || this.waitTime;
this.timeHandle = setTimeout(function () {
console.log('open lock');
this.timeHandle = undefined;
this._timeEnd();
}.bind(this), this._waitTime);
} else {
console.log('is lock');
}
};
/* ================================================================== */
this._timeEnd = function () {
var now = (new Date()).getTime();
var diff = now - this.checkTime;
console.log('timeCheck: 離上一次激發時間: ', diff);
if (diff < this.waitTime) {
// 未過時間檢測間隔
this._waitTime = this.waitTime - diff;
console.log('will lock agin: 上鎖時間: ', this._waitTime);
this._bindTimeCheck();
} else {
// 已過時間檢測間隔
console.log('finish');
this._waitTime = undefined;
// 執行任務
this._doJob();
}
};
/* ================================================================== */
this._doJob = function () {
var self = this;
// 執行任務
this._callback(this.dataList);
};
/* ================================================================== */
this.check = function () {
var error_array = [];
if (!this._callback) {
error_array.push('no setting function');
}
if (error_array.length > 0) {
throw new Error(error_array.join(' | '));
}
};
}).call(Debounce.prototype);
})(this || {});
