ng-zorro-antd-mobile/esm5/core/util/velocity.js

An enterprise-class mobile UI components based on Ant Design and Angular

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,uselessCode} checked by tsc
 */
/**
 * @return {?}
 */
export function getVelocity() {
    return (function (minInterval, maxInterval) {
        if (minInterval === void 0) { minInterval = 30; }
        if (maxInterval === void 0) { maxInterval = 100; }
        /** @type {?} */
        var _time = 0;
        /** @type {?} */
        var _y = 0;
        /** @type {?} */
        var _velocity = 0;
        /** @type {?} */
        var recorder = {
            record: function (y) {
                /** @type {?} */
                var now = +new Date();
                _velocity = (y - _y) / (now - _time);
                if (now - _time >= minInterval) {
                    _velocity = now - _time <= maxInterval ? _velocity : 0;
                    _y = y;
                    _time = now;
                }
            },
            getVelocity: function (y) {
                if (y !== _y) {
                    recorder.record(y);
                }
                return _velocity;
            },
        };
        return recorder;
    })();
}

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