fix: Fix carousel click problem

__tests__/scrollingCarousel.spec.tsx

@@ -1,5 +1,5 @@
 import React, { MouseEvent } from 'react';
-import { render, cleanup } from '@testing-library/react';
+import { render, cleanup, fireEvent, wait } from '@testing-library/react';
 import { ScrollingCarousel } from '../src';
 import { carouselItemNodes } from './__fixtures__/nodes';
 import * as helpers from '../src/helpers';
@@ -21,15 +21,15 @@ describe('<ScrollingCarousel />', () => {
 		Object.defineProperties(HTMLDivElement.prototype, {
 			scrollWidth: {
 				value: 1000,
-				writable: true
+				writable: true,
 			},
 			scrollLeft: {
 				value: 100,
-				writable: true
+				writable: true,
 			},
 			offsetWidth: {
 				value: 200,
-				writable: true
+				writable: true,
 			},
 		});
 
@@ -41,19 +41,18 @@ describe('<ScrollingCarousel />', () => {
 
 	it('should render right layout', async () => {
 		const { getByTestId } = render(
-			<ScrollingCarousel
-				children={carouselItemNodes(6)}
-			/>,
+			<ScrollingCarousel triggerClickOn={3} children={carouselItemNodes(6)} />,
 		);
 		const carousel = getByTestId('carousel');
 
 		expect(carousel.firstChild);
 		expect(carousel.firstChild!.firstChild).toBeTruthy();
 	});
 
-	it('should render arrow icons', async () => {
+	it('should render right arrow icon', async () => {
 		const { getByTestId } = render(
 			<ScrollingCarousel
+				triggerClickOn={3}
 				rightIcon={<i />}
 				children={carouselItemNodes(6)}
 			/>,
@@ -64,6 +63,43 @@ describe('<ScrollingCarousel />', () => {
 		expect(carousel.firstChild);
 		expect(carousel.firstChild!.firstChild).toBeTruthy();
 		expect(rightArrow!.firstChild).toBeInstanceOf(HTMLElement);
+		expect(leftArrow).toBe(null);
+	});
+
+	it('should render left arrow icon', async () => {
+		const { getByTestId } = render(
+			<ScrollingCarousel
+				triggerClickOn={3}
+				leftIcon={<i />}
+				children={carouselItemNodes(6)}
+			/>,
+		);
+		const carousel = getByTestId('carousel');
+		const rightArrow = carousel.querySelector('[data-arrow="right"]');
+		const leftArrow = carousel.querySelector('[data-arrow="left"]');
+		expect(carousel.firstChild);
+		expect(carousel.firstChild!.firstChild).toBeTruthy();
+		expect(rightArrow).toBe(null);
 		expect(leftArrow!.firstChild).toBeInstanceOf(HTMLElement);
 	});
+
+	it('should add sliding class when isDown is true', async () => {
+		jest.spyOn((window as any).Math, 'abs').mockReturnValue(4);
+
+		const { getByTestId, container } = render(
+			<ScrollingCarousel
+				triggerClickOn={3}
+				leftIcon={<i />}
+				children={carouselItemNodes(6)}
+			/>,
+		);
+
+		const sliderList = getByTestId('sliderList');
+		fireEvent.mouseDown(sliderList, { pageX: 600 });
+		fireEvent.mouseMove(sliderList, { pageX: 600 });
+
+		wait(() => {
+			expect(container.querySelector('.sliding')).toBeInTheDocument();
+		});
+	});
 });

src/components/scrolling-carousel/defaultProps.ts

@@ -0,0 +1,9 @@
+import { SliderProps } from '.';
+
+export const defaultProps: Required<SliderProps> = {
+	children: [],
+	className: '',
+	leftIcon: null,
+	rightIcon: null,
+	triggerClickOn: 3,
+};

src/components/scrolling-carousel/index.tsx

@@ -9,13 +9,15 @@ import React, {
 import { Item, SlideDirection } from '../../types/carousel';
 import styles from '../../styles/slider/styles.module.css';
 import { getOuterWidth } from '../../helpers';
-
-export const ScrollingCarousel: FunctionComponent<SliderProps> = ({
-	children,
-	className,
-	leftIcon,
-	rightIcon,
-}: SliderProps) => {
+import { defaultProps } from './defaultProps';
+
+export const ScrollingCarousel: FunctionComponent<SliderProps> = (
+	userProps: SliderProps,
+) => {
+	const { children, className, leftIcon, rightIcon, triggerClickOn } = {
+		...defaultProps,
+		...userProps,
+	};
 	const slider = useRef<HTMLDivElement>(null);
 	const [isDown, setIsDown] = useState(false);
 	const [position, setPosition] = useState({
@@ -67,10 +69,12 @@ export const ScrollingCarousel: FunctionComponent<SliderProps> = ({
 	const mouseMove = (e: MouseEvent) => {
 		if (!isDown) return;
 		e.preventDefault();
-		slider.current!.classList.add(styles.sliding);
 		const eventPosition = e.pageX - slider.current!.offsetLeft;
 		const slide = eventPosition - position.startX;
 
+		if (Math.abs(slide) > triggerClickOn) {
+			slider.current!.classList.add(styles.sliding);
+		}
 		slider.current!.scrollLeft = position.scrollLeft - slide;
 	};
 
@@ -136,9 +140,14 @@ export const ScrollingCarousel: FunctionComponent<SliderProps> = ({
 
 	return (
 		<div className={`${styles.sliderBase} ${className}`} data-testid="carousel">
-			{showArrow.left && getArrow(SlideDirection.Right, 'left', leftIcon)}
-			{showArrow.right && getArrow(SlideDirection.Left, 'right', rightIcon)}
+			{showArrow.left &&
+				leftIcon &&
+				getArrow(SlideDirection.Right, 'left', leftIcon)}
+			{showArrow.right &&
+				rightIcon &&
+				getArrow(SlideDirection.Left, 'right', rightIcon)}
 			<div
+				data-testid="sliderList"
 				ref={ref}
 				onMouseDown={mouseDown}
 				onMouseLeave={mouseUp}
@@ -155,8 +164,9 @@ export const ScrollingCarousel: FunctionComponent<SliderProps> = ({
 export interface SliderProps {
 	children: Item[];
 	className?: string;
-	leftIcon?: ReactElement;
-	rightIcon?: ReactElement;
+	leftIcon?: ReactElement | null;
+	rightIcon?: ReactElement | null;
+	triggerClickOn?: number;
 }
 
 export type Arrows = {