@antv/util/lib/lodash/throttle.js

<h1 align="center">@antv/util</h1>

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.default = (function (func, wait, options) {
    var timeout, context, args, result;
    var previous = 0;
    if (!options)
        options = {};
    var later = function () {
        previous = options.leading === false ? 0 : Date.now();
        timeout = null;
        result = func.apply(context, args);
        if (!timeout)
            context = args = null;
    };
    var throttled = function () {
        var now = Date.now();
        if (!previous && options.leading === false)
            previous = now;
        var remaining = wait - (now - previous);
        context = this;
        args = arguments;
        if (remaining <= 0 || remaining > wait) {
            if (timeout) {
                clearTimeout(timeout);
                timeout = null;
            }
            previous = now;
            result = func.apply(context, args);
            if (!timeout)
                context = args = null;
        }
        else if (!timeout && options.trailing !== false) {
            timeout = setTimeout(later, remaining);
        }
        return result;
    };
    throttled.cancel = function () {
        clearTimeout(timeout);
        previous = 0;
        timeout = context = args = null;
    };
    return throttled;
});
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