fix[BackTop]: delete visible & use visibilityHeight=0 replace visible (#38763)

* type: delete visible & code optimization

* add PureBackTop

* fix: update snap

* fix: cov

* fix: add istanbul ignore

* fix

* feat: use visibilityHeight=0 replace visible=true

* snap

* cov

* test case

* test case

* fix

* fix cov

* fix test

* simplify code

* rename function

components/back-top/__tests__/index.test.tsx

@@ -5,47 +5,42 @@ import rtlTest from '../../../tests/shared/rtlTest';
 import { fireEvent, render, waitFakeTimer } from '../../../tests/utils';
 
 describe('BackTop', () => {
+  beforeEach(() => {
+    jest.useFakeTimers();
+  });
+  afterEach(() => {
+    jest.useRealTimers();
+  });
   mountTest(BackTop);
   rtlTest(BackTop);
 
   it('should scroll to top after click it', async () => {
-    jest.useFakeTimers();
+    const { container } = render(<BackTop />);
-
-    const { container } = render(<BackTop visibilityHeight={-1} />);
     const scrollToSpy = jest.spyOn(window, 'scrollTo').mockImplementation((_, y) => {
       window.scrollY = y;
       window.pageYOffset = y;
       document.documentElement.scrollTop = y;
     });
     window.scrollTo(0, 400);
+    await waitFakeTimer();
     expect(document.documentElement.scrollTop).toBe(400);
-    fireEvent.click(container.querySelector('.ant-back-top')!);
+    fireEvent.click(container.querySelector<HTMLDivElement>('.ant-back-top')!);
     await waitFakeTimer();
     expect(document.documentElement.scrollTop).toBe(0);
     scrollToSpy.mockRestore();
-
-    jest.clearAllTimers();
-    jest.useRealTimers();
   });
 
-  it('support onClick', async () => {
+  it('support onClick', () => {
     const onClick = jest.fn();
-    const { container } = render(<BackTop onClick={onClick} visibilityHeight={-1} />);
+    const { container } = render(<BackTop onClick={onClick} visibilityHeight={0} />);
-    const scrollToSpy = jest.spyOn(window, 'scrollTo').mockImplementation((_, y) => {
+    fireEvent.click(container.querySelector<HTMLDivElement>('.ant-back-top')!);
-      window.scrollY = y;
-      window.pageYOffset = y;
-    });
-    document.dispatchEvent(new Event('scroll'));
-    window.scrollTo(0, 400);
-    fireEvent.click(container.querySelector('.ant-back-top')!);
     expect(onClick).toHaveBeenCalled();
-    scrollToSpy.mockRestore();
   });
 
-  it('invalid target', async () => {
+  it('invalid target', () => {
     const onClick = jest.fn();
-    const { container } = render(<BackTop onClick={onClick} visible target={undefined} />);
+    const { container } = render(<BackTop onClick={onClick} target={undefined} />);
-    fireEvent.click(container.querySelector('.ant-back-top')!);
+    fireEvent.click(container.querySelector<HTMLDivElement>('.ant-back-top')!);
     expect(onClick).toHaveBeenCalled();
   });
   it('should console Error', () => {

components/back-top/index.tsx

@@ -2,9 +2,9 @@ import VerticalAlignTopOutlined from '@ant-design/icons/VerticalAlignTopOutlined
 import classNames from 'classnames';
 import CSSMotion from 'rc-motion';
 import addEventListener from 'rc-util/lib/Dom/addEventListener';
-import useMergedState from 'rc-util/lib/hooks/useMergedState';
 import omit from 'rc-util/lib/omit';
 import * as React from 'react';
+import type { ConfigConsumerProps } from '../config-provider';
 import { ConfigContext } from '../config-provider';
 import getScroll from '../_util/getScroll';
 import { cloneElement } from '../_util/reactNode';
@@ -22,62 +22,36 @@ export interface BackTopProps {
   className?: string;
   style?: React.CSSProperties;
   duration?: number;
-  visible?: boolean; // Only for test. Don't use it.
 }
 
-interface ChildrenProps {
-  prefixCls: string;
-  rootPrefixCls: string;
-  children?: React.ReactNode;
-  visible?: boolean; // Only for test. Don't use it.
-}
-
-const BackTopContent: React.FC<ChildrenProps> = (props) => {
-  const { prefixCls, rootPrefixCls, children, visible } = props;
-  const defaultElement = (
-    <div className={`${prefixCls}-content`}>
-      <div className={`${prefixCls}-icon`}>
-        <VerticalAlignTopOutlined />
-      </div>
-    </div>
-  );
-  return (
-    <CSSMotion visible={visible} motionName={`${rootPrefixCls}-fade`}>
-      {({ className: motionClassName }) =>
-        cloneElement(children || defaultElement, ({ className }) => ({
-          className: classNames(motionClassName, className),
-        }))
-      }
-    </CSSMotion>
-  );
-};
-
 const BackTop: React.FC<BackTopProps> = (props) => {
-  const [visible, setVisible] = useMergedState(false, {
+  const {
-    value: props.visible,
+    prefixCls: customizePrefixCls,
-  });
+    className = '',
+    visibilityHeight = 400,
+    target,
+    onClick,
+    duration = 450,
+  } = props;
+  const [visible, setVisible] = React.useState<boolean>(visibilityHeight === 0);
 
-  const ref = React.createRef<HTMLDivElement>();
+  const ref = React.useRef<HTMLDivElement>(null);
-  const scrollEvent = React.useRef<ReturnType<typeof addEventListener>>(null);
+  const scrollEvent = React.useRef<ReturnType<typeof addEventListener> | null>(null);
 
-  const getDefaultTarget = () =>
+  const getDefaultTarget = (): HTMLElement | Document | Window =>
     ref.current && ref.current.ownerDocument ? ref.current.ownerDocument : window;
 
   const handleScroll = throttleByAnimationFrame(
-    (e: React.UIEvent<HTMLElement> | { target: any }) => {
+    (e: React.UIEvent<HTMLElement, UIEvent> | { target: any }) => {
-      const { visibilityHeight = 400 } = props;
       const scrollTop = getScroll(e.target, true);
-      setVisible(scrollTop > visibilityHeight);
+      setVisible(scrollTop >= visibilityHeight);
     },
   );
 
   const bindScrollEvent = () => {
-    const { target } = props;
     const getTarget = target || getDefaultTarget;
     const container = getTarget();
-    scrollEvent.current = addEventListener(container, 'scroll', (e: React.UIEvent<HTMLElement>) => {
+    scrollEvent.current = addEventListener(container, 'scroll', handleScroll);
-      handleScroll(e);
-    });
     handleScroll({ target: container });
   };
 
@@ -88,26 +62,18 @@ const BackTop: React.FC<BackTopProps> = (props) => {
   React.useEffect(() => {
     bindScrollEvent();
     return () => {
-      if (scrollEvent.current) {
-        scrollEvent.current.remove();
-      }
       handleScroll.cancel();
+      scrollEvent.current?.remove();
     };
-  }, [props.target]);
+  }, [target]);
 
   const scrollToTop = (e: React.MouseEvent<HTMLDivElement>) => {
-    const { onClick, target, duration = 450 } = props;
+    scrollTo(0, { getContainer: target || getDefaultTarget, duration });
-    scrollTo(0, {
+    onClick?.(e);
-      getContainer: target || getDefaultTarget,
-      duration,
-    });
-    if (typeof onClick === 'function') {
-      onClick(e);
-    }
   };
 
-  const { getPrefixCls, direction } = React.useContext(ConfigContext);
+  const { getPrefixCls, direction } = React.useContext<ConfigConsumerProps>(ConfigContext);
-  const { prefixCls: customizePrefixCls, className = '' } = props;
+
   const prefixCls = getPrefixCls('back-top', customizePrefixCls);
   const rootPrefixCls = getPrefixCls();
   const [wrapSSR, hashId] = useStyle(prefixCls);
@@ -128,14 +94,25 @@ const BackTop: React.FC<BackTopProps> = (props) => {
     'children',
     'visibilityHeight',
     'target',
-    'visible',
   ]);
 
+  const defaultElement = (
+    <div className={`${prefixCls}-content`}>
+      <div className={`${prefixCls}-icon`}>
+        <VerticalAlignTopOutlined />
+      </div>
+    </div>
+  );
+
   return wrapSSR(
     <div {...divProps} className={classString} onClick={scrollToTop} ref={ref}>
-      <BackTopContent prefixCls={prefixCls} rootPrefixCls={rootPrefixCls} visible={visible}>
+      <CSSMotion visible={visible} motionName={`${rootPrefixCls}-fade`}>
-        {props.children}
+        {({ className: motionClassName }) =>
-      </BackTopContent>
+          cloneElement(props.children || defaultElement, ({ className: cloneCls }) => ({
+            className: classNames(motionClassName, cloneCls),
+          }))
+        }
+      </CSSMotion>
     </div>,
   );
 };

components/config-provider/__tests__/components.test.tsx

@@ -144,7 +144,7 @@ describe('ConfigProvider', () => {
     testPair('Avatar', (props) => <Avatar {...props} />);
 
     // BackTop
-    testPair('BackTop', (props) => <BackTop visible {...props} />);
+    testPair('BackTop', (props) => <BackTop visibilityHeight={0} {...props} />);
 
     // Badge
     testPair('Badge', (props) => {

components/float-button/BackTop.tsx

@@ -2,8 +2,7 @@ import VerticalAlignTopOutlined from '@ant-design/icons/VerticalAlignTopOutlined
 import classNames from 'classnames';
 import CSSMotion from 'rc-motion';
 import addEventListener from 'rc-util/lib/Dom/addEventListener';
-import useMergedState from 'rc-util/lib/hooks/useMergedState';
+import React, { memo, useContext, useEffect, useRef, useState } from 'react';
-import React, { memo, useContext, useEffect, useRef } from 'react';
 import FloatButton, { floatButtonPrefixCls } from './FloatButton';
 import type { ConfigConsumerProps } from '../config-provider';
 import { ConfigContext } from '../config-provider';
@@ -11,7 +10,7 @@ import getScroll from '../_util/getScroll';
 import scrollTo from '../_util/scrollTo';
 import throttleByAnimationFrame from '../_util/throttleByAnimationFrame';
 import FloatButtonGroupContext from './context';
-import type { BackTopProps, FloatButtonShape } from './interface';
+import type { BackTopProps, FloatButtonProps, FloatButtonShape } from './interface';
 import useStyle from './style';
 
 const BackTop: React.FC<BackTopProps> = (props) => {
@@ -28,46 +27,39 @@ const BackTop: React.FC<BackTopProps> = (props) => {
     ...restProps
   } = props;
 
-  const [visible, setVisible] = useMergedState(false, { value: props.visible });
+  const [visible, setVisible] = useState<boolean>(visibilityHeight === 0);
 
   const ref = useRef<HTMLAnchorElement | HTMLButtonElement>(null);
-
+  const scrollEvent = useRef<ReturnType<typeof addEventListener> | null>(null);
-  const scrollEvent = useRef<any>(null);
 
   const getDefaultTarget = (): HTMLElement | Document | Window =>
     ref.current && ref.current.ownerDocument ? ref.current.ownerDocument : window;
 
   const handleScroll = throttleByAnimationFrame(
-    (e: React.UIEvent<HTMLElement> | { target: any }) => {
+    (e: React.UIEvent<HTMLElement, UIEvent> | { target: any }) => {
       const scrollTop = getScroll(e.target, true);
-      setVisible(scrollTop > visibilityHeight!);
+      setVisible(scrollTop >= visibilityHeight);
     },
   );
 
   const bindScrollEvent = () => {
     const getTarget = target || getDefaultTarget;
     const container = getTarget();
-    scrollEvent.current = addEventListener(container, 'scroll', (e: React.UIEvent<HTMLElement>) => {
+    scrollEvent.current = addEventListener(container, 'scroll', handleScroll);
-      handleScroll(e);
-    });
     handleScroll({ target: container });
   };
 
   useEffect(() => {
     bindScrollEvent();
     return () => {
-      if (scrollEvent.current) {
-        scrollEvent.current.remove();
-      }
       handleScroll.cancel();
+      scrollEvent.current?.remove();
     };
   }, [target]);
 
   const scrollToTop: React.MouseEventHandler<HTMLDivElement> = (e) => {
     scrollTo(0, { getContainer: target || getDefaultTarget, duration });
-    if (typeof onClick === 'function') {
+    onClick?.(e);
-      onClick(e);
-    }
   };
 
   const { getPrefixCls } = useContext<ConfigConsumerProps>(ConfigContext);
@@ -80,7 +72,7 @@ const BackTop: React.FC<BackTopProps> = (props) => {
 
   const mergeShape = groupShape || shape;
 
-  const contentProps = { prefixCls, icon, type, shape: mergeShape, ...restProps };
+  const contentProps: FloatButtonProps = { prefixCls, icon, type, shape: mergeShape, ...restProps };
 
   return wrapSSR(
     <CSSMotion visible={visible} motionName={`${rootPrefixCls}-fade`}>

components/float-button/PurePanel.tsx

@@ -7,7 +7,7 @@ import BackTop from './BackTop';
 import type { FloatButtonProps, FloatButtonGroupProps } from './interface';
 import { ConfigContext } from '../config-provider';
 
-export interface PureFloatButtonProps extends FloatButtonProps {
+export interface PureFloatButtonProps extends Omit<FloatButtonProps, 'target'> {
   backTop?: boolean;
 }
 
@@ -18,11 +18,10 @@ export interface PurePanelProps
   items?: PureFloatButtonProps[];
 }
 
-function PureFloatButton({ backTop, ...props }: PureFloatButtonProps) {
+const PureFloatButton: React.FC<PureFloatButtonProps> = ({ backTop, ...props }) =>
-  return backTop ? <BackTop {...props} visible target={undefined} /> : <FloatButton {...props} />;
+  backTop ? <BackTop {...props} visibilityHeight={0} /> : <FloatButton {...props} />;
-}
 
-export default function PurePanel({ className, items, ...props }: PurePanelProps) {
+function PurePanel({ className, items, ...props }: PurePanelProps) {
   const { prefixCls: customizePrefixCls } = props;
 
   const { getPrefixCls } = React.useContext(ConfigContext);
@@ -41,3 +40,5 @@ export default function PurePanel({ className, items, ...props }: PurePanelProps
 
   return <PureFloatButton className={classNames(className, pureCls)} {...props} />;
 }
+
+export default React.memo(PurePanel);

components/float-button/__tests__/back-top.test.tsx

@@ -2,52 +2,53 @@ import React from 'react';
 import FloatButton from '..';
 import mountTest from '../../../tests/shared/mountTest';
 import rtlTest from '../../../tests/shared/rtlTest';
-import { fireEvent, render, sleep } from '../../../tests/utils';
+import { fireEvent, render, waitFakeTimer } from '../../../tests/utils';
 
 const { BackTop } = FloatButton;
 describe('BackTop', () => {
+  beforeEach(() => {
+    jest.useFakeTimers();
+  });
+  afterEach(() => {
+    jest.useRealTimers();
+  });
   mountTest(BackTop);
   rtlTest(BackTop);
 
   it('should scroll to top after click it', async () => {
-    const { container } = render(<BackTop visible visibilityHeight={-1} />);
+    const { container } = render(<BackTop />);
     const scrollToSpy = jest.spyOn(window, 'scrollTo').mockImplementation((_, y) => {
       window.scrollY = y;
       window.pageYOffset = y;
       document.documentElement.scrollTop = y;
     });
     window.scrollTo(0, 400);
+    await waitFakeTimer();
     expect(document.documentElement.scrollTop).toBe(400);
-    fireEvent.click(container.querySelector('.ant-float-btn')!);
+    fireEvent.click(container.querySelector<HTMLButtonElement>('.ant-float-btn')!);
-    await sleep(500);
+    await waitFakeTimer();
     expect(document.documentElement.scrollTop).toBe(0);
     scrollToSpy.mockRestore();
   });
 
   it('support onClick', () => {
     const onClick = jest.fn();
-    const { container } = render(<BackTop visible visibilityHeight={-1} onClick={onClick} />);
+    const { container } = render(<BackTop onClick={onClick} visibilityHeight={0} />);
-    const scrollToSpy = jest.spyOn(window, 'scrollTo').mockImplementation((_, y) => {
+    fireEvent.click(container.querySelector<HTMLButtonElement>('.ant-float-btn')!);
-      window.scrollY = y;
-      window.pageYOffset = y;
-    });
-    document.dispatchEvent(new Event('scroll'));
-    window.scrollTo(0, 400);
-    fireEvent.click(container.querySelector('.ant-float-btn')!);
     expect(onClick).toHaveBeenCalled();
-    scrollToSpy.mockRestore();
   });
 
-  it('invalid target', () => {
+  it('support invalid target', () => {
     const onClick = jest.fn();
-    const { container } = render(<BackTop onClick={onClick} visible target={undefined} />);
+    const { container } = render(
-    fireEvent.click(container.querySelector('.ant-float-btn')!);
+      <BackTop onClick={onClick} visibilityHeight={0} target={undefined} />,
+    );
+    fireEvent.click(container.querySelector<HTMLButtonElement>('.ant-float-btn')!);
     expect(onClick).toHaveBeenCalled();
   });
 
   it('pass style to float button', () => {
-    const { container } = render(<BackTop style={{ color: 'red' }} visible target={undefined} />);
+    const { container } = render(<BackTop style={{ color: 'red' }} visibilityHeight={0} />);
-    const btn = container.querySelector('.ant-float-btn')!;
+    expect(container.querySelector<HTMLButtonElement>('.ant-float-btn')?.style.color).toBe('red');
-    expect(btn).toHaveAttribute('style', 'color: red;');
   });
 });

components/float-button/index.tsx

@@ -3,8 +3,8 @@ import FloatButtonGroup from './FloatButtonGroup';
 import BackTop from './BackTop';
 import PurePanel from './PurePanel';
 
-FloatButton.Group = FloatButtonGroup;
 FloatButton.BackTop = BackTop;
+FloatButton.Group = FloatButtonGroup;
 FloatButton._InternalPanelDoNotUseOrYouWillBeFired = PurePanel;
 
 export default FloatButton;

components/float-button/interface.ts

@@ -53,7 +53,6 @@ export interface BackTopProps extends Omit<FloatButtonProps, 'target'> {
   className?: string;
   style?: React.CSSProperties;
   duration?: number;
-  visible?: boolean; // Only for test. Don't use it.
 }
 
 export type CompoundedComponent = React.ForwardRefExoticComponent<