@swimlane/ngx-charts/esm2015/lib/utils/throttle.js

/**
 * Throttle a function
 *
 */
export function throttle(func, wait, options) {
    options = options || {};
    let context;
    let args;
    let result;
    let timeout = null;
    let previous = 0;
    function later() {
        previous = options.leading === false ? 0 : +new Date();
        timeout = null;
        result = func.apply(context, args);
    }
    return function () {
        const now = +new Date();
        if (!previous && options.leading === false) {
            previous = now;
        }
        const remaining = wait - (now - previous);
        context = this;
        args = arguments;
        if (remaining <= 0) {
            clearTimeout(timeout);
            timeout = null;
            previous = now;
            result = func.apply(context, args);
        }
        else if (!timeout && options.trailing !== false) {
            timeout = setTimeout(later, remaining);
        }
        return result;
    };
}
/**
 * Throttle decorator
 *
 *  class MyClass {
 *    throttleable(10)
 *    myFn() { ... }
 *  }
 */
export function throttleable(duration, options) {
    return function innerDecorator(target, key, descriptor) {
        return {
            configurable: true,
            enumerable: descriptor.enumerable,
            get: function getter() {
                Object.defineProperty(this, key, {
                    configurable: true,
                    enumerable: descriptor.enumerable,
                    value: throttle(descriptor.value, duration, options)
                });
                return this[key];
            }
        };
    };
}
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