feat(back-top): add back-top component

site/site.config.mjs

@@ -129,6 +129,12 @@ export default {
           path: '/react/components/anchor',
           component: () => import('tdesign-react/anchor/anchor.md'),
         },
+        {
+          title: 'BackTop 返回顶部',
+          name: 'back-top',
+          path: '/react/components/back-top',
+          component: () => import('tdesign-react/back-top/back-top.md'),
+        },
         {
           title: 'Breadcrumb 面包屑',
           name: 'breadcrumb',

src/back-top/BackTop.tsx

@@ -0,0 +1,108 @@
+import classNames from 'classnames';
+import React, { useCallback, useMemo } from 'react';
+import { BacktopIcon } from 'tdesign-icons-react';
+import useConfig from '../hooks/useConfig';
+import { TdBackTopProps } from './type';
+import { backTopDefaultProps } from './defaultProps';
+import useScroll from './useScroll';
+import { scrollTo } from '../_util/dom';
+
+export type BackTopProps = TdBackTopProps;
+
+const getContainer = (container: string | Function) => {
+  if (typeof container === 'string') {
+    if (typeof document !== 'undefined') {
+      return document.querySelector(container);
+    }
+  }
+  if (typeof container === 'function') {
+    return container();
+  }
+  return null;
+};
+
+const BackTop = (props: BackTopProps) => {
+  const {
+    theme,
+    size,
+    shape,
+    target,
+    visibleHeight,
+    container,
+    duration,
+    content,
+    offset,
+    children,
+    default: cusContent,
+    className,
+    style,
+    onClick,
+  } = props;
+  const { classPrefix } = useConfig();
+  const scrollContainer = useMemo(() => getContainer(container), [container]);
+  const { scrollTop } = useScroll({ target: scrollContainer });
+  const defaultContent = (
+    <>
+      <BacktopIcon className={`${classPrefix}-back-top__icon`} size={24} />
+      <span className={`${classPrefix}-back-top__text`}>TOP</span>
+    </>
+  );
+  const renderChildren = children || content || cusContent || defaultContent;
+
+  const visible = useMemo(() => {
+    if (typeof visibleHeight === 'string') {
+      return scrollTop >= Number(visibleHeight.replace('px', ''));
+    }
+    return scrollTop >= visibleHeight;
+  }, [scrollTop, visibleHeight]);
+
+  const backTopStyle = useMemo(
+    () => ({
+      insetInlineEnd: offset[0],
+      insetBlockEnd: offset[1],
+      ...style,
+    }),
+    [offset, style],
+  );
+
+  const cls = classNames(
+    className,
+    `${classPrefix}-back-top`,
+    `${classPrefix}-back-top--theme-${theme}`,
+    `${classPrefix}-back-top--${shape}`,
+    {
+      [`${classPrefix}-back-top--show`]: visible,
+      [`${classPrefix}-size-s`]: size === 'small',
+      [`${classPrefix}-size-m`]: size === 'medium',
+    },
+  );
+
+  const getBackTo = useCallback(() => {
+    if (!target) return 0;
+    const targetNode = getContainer(target);
+    if (!targetNode) return 0;
+    const rect = targetNode.getBoundingClientRect();
+    const { y } = rect;
+    return y;
+  }, [target]);
+
+  const handleClick = useCallback(
+    (e: React.MouseEvent<HTMLButtonElement, MouseEvent>) => {
+      e.stopPropagation();
+      onClick?.({ e });
+      const backTo = getBackTo();
+      scrollTo(backTo, { container: scrollContainer, duration });
+    },
+    [duration, getBackTo, onClick, scrollContainer],
+  );
+
+  return (
+    <button type="button" className={cls} style={backTopStyle} onClick={handleClick}>
+      {renderChildren}
+    </button>
+  );
+};
+
+BackTop.displayName = 'BackTop';
+BackTop.defaultProps = backTopDefaultProps;
+export default BackTop;

src/back-top/__tests__/__snapshots__/vitest-back-top.test.jsx.snap

@@ -0,0 +1,169 @@
+// Vitest Snapshot v1
+
+exports[`BackTop Component > props.children works fine 1`] = `
+<div>
+  <button
+    class="t-back-top t-back-top--theme-light t-back-top--square t-size-m"
+    style="inset-inline-end: 24px; inset-block-end: 80px;"
+    type="button"
+  >
+    <span
+      class="custom-node"
+    >
+      TNode
+    </span>
+  </button>
+</div>
+`;
+
+exports[`BackTop Component > props.content works fine 1`] = `
+<div>
+  <button
+    class="t-back-top t-back-top--theme-light t-back-top--square t-size-m"
+    style="inset-inline-end: 24px; inset-block-end: 80px;"
+    type="button"
+  >
+    <span
+      class="custom-node"
+    >
+      TNode
+    </span>
+  </button>
+</div>
+`;
+
+exports[`BackTop Component > props.default works fine 1`] = `
+<div>
+  <button
+    class="t-back-top t-back-top--theme-light t-back-top--square t-size-m"
+    style="inset-inline-end: 24px; inset-block-end: 80px;"
+    type="button"
+  >
+    <span
+      class="custom-node"
+    >
+      TNode
+    </span>
+  </button>
+</div>
+`;
+
+exports[`BackTop Component > props.shape is equal to circle 1`] = `
+<div>
+  <button
+    class="t-back-top t-back-top--theme-light t-back-top--circle t-size-m"
+    style="inset-inline-end: 24px; inset-block-end: 80px;"
+    type="button"
+  >
+    <svg
+      class="t-icon t-icon-backtop t-back-top__icon"
+      fill="none"
+      height="1em"
+      style="font-size: 24px;"
+      viewBox="0 0 16 16"
+      width="1em"
+    >
+      <path
+        d="M2 3h12V2H2v1zM3.38 10.23l4.1-4.03v8.64H8.5V6.2l4.18 4.08.71-.7-5.05-4.93a.5.5 0 00-.7 0l-4.98 4.9.72.69z"
+        fill="currentColor"
+        fill-opacity="0.9"
+      />
+    </svg>
+    <span
+      class="t-back-top__text"
+    >
+      TOP
+    </span>
+  </button>
+</div>
+`;
+
+exports[`BackTop Component > props.shape is equal to square 1`] = `
+<div>
+  <button
+    class="t-back-top t-back-top--theme-light t-back-top--square t-size-m"
+    style="inset-inline-end: 24px; inset-block-end: 80px;"
+    type="button"
+  >
+    <svg
+      class="t-icon t-icon-backtop t-back-top__icon"
+      fill="none"
+      height="1em"
+      style="font-size: 24px;"
+      viewBox="0 0 16 16"
+      width="1em"
+    >
+      <path
+        d="M2 3h12V2H2v1zM3.38 10.23l4.1-4.03v8.64H8.5V6.2l4.18 4.08.71-.7-5.05-4.93a.5.5 0 00-.7 0l-4.98 4.9.72.69z"
+        fill="currentColor"
+        fill-opacity="0.9"
+      />
+    </svg>
+    <span
+      class="t-back-top__text"
+    >
+      TOP
+    </span>
+  </button>
+</div>
+`;
+
+exports[`BackTop Component > props.size is equal to medium 1`] = `
+<div>
+  <button
+    class="t-back-top t-back-top--theme-light t-back-top--square t-size-m"
+    style="inset-inline-end: 24px; inset-block-end: 80px;"
+    type="button"
+  >
+    BackTop
+  </button>
+</div>
+`;
+
+exports[`BackTop Component > props.size is equal to small 1`] = `
+<div>
+  <button
+    class="t-back-top t-back-top--theme-light t-back-top--square t-size-s"
+    style="inset-inline-end: 24px; inset-block-end: 80px;"
+    type="button"
+  >
+    BackTop
+  </button>
+</div>
+`;
+
+exports[`BackTop Component > props.theme is equal to dark 1`] = `
+<div>
+  <button
+    class="t-back-top t-back-top--theme-dark t-back-top--square t-size-m"
+    style="inset-inline-end: 24px; inset-block-end: 80px;"
+    type="button"
+  >
+    Text
+  </button>
+</div>
+`;
+
+exports[`BackTop Component > props.theme is equal to light 1`] = `
+<div>
+  <button
+    class="t-back-top t-back-top--theme-light t-back-top--square t-size-m"
+    style="inset-inline-end: 24px; inset-block-end: 80px;"
+    type="button"
+  >
+    Text
+  </button>
+</div>
+`;
+
+exports[`BackTop Component > props.theme is equal to primary 1`] = `
+<div>
+  <button
+    class="t-back-top t-back-top--theme-primary t-back-top--square t-size-m"
+    style="inset-inline-end: 24px; inset-block-end: 80px;"
+    type="button"
+  >
+    Text
+  </button>
+</div>
+`;

src/back-top/__tests__/vitest-back-top.test.jsx

@@ -0,0 +1,67 @@
+/* eslint-disable @typescript-eslint/no-unused-vars */
+/**
+ * 该文件由脚本自动生成，如需修改请联系 PMC
+ * This file generated by scripts of tdesign-api. `npm run api:docs BackTop React(PC) vitest,finalProject`
+ * If you need to modify this file, contact PMC first please.
+ */
+import React from 'react';
+import { fireEvent, vi, render } from '@test/utils';
+import { BackTop } from '..';
+
+describe('BackTop Component', () => {
+  it('props.children works fine', () => {
+    const { container } = render(
+      <BackTop>
+        <span className="custom-node">TNode</span>
+      </BackTop>,
+    );
+    expect(container.querySelector('.custom-node')).toBeTruthy();
+    expect(container).toMatchSnapshot();
+  });
+
+  it('props.content works fine', () => {
+    const { container } = render(<BackTop content={<span className="custom-node">TNode</span>}></BackTop>);
+    expect(container.querySelector('.custom-node')).toBeTruthy();
+    expect(container).toMatchSnapshot();
+  });
+
+  it('props.default works fine', () => {
+    const { container } = render(<BackTop default={<span className="custom-node">TNode</span>}></BackTop>);
+    expect(container.querySelector('.custom-node')).toBeTruthy();
+    expect(container).toMatchSnapshot();
+  });
+
+  ['circle', 'square'].forEach((item) => {
+    it(`props.shape is equal to ${item}`, () => {
+      const { container } = render(<BackTop shape={item}></BackTop>);
+      expect(container.firstChild).toHaveClass(`t-back-top--${item}`);
+      expect(container).toMatchSnapshot();
+    });
+  });
+
+  const sizeClassNameList = ['t-size-m', 't-size-s'];
+  ['medium', 'small'].forEach((item, index) => {
+    it(`props.size is equal to ${item}`, () => {
+      const { container } = render(<BackTop size={item}>BackTop</BackTop>);
+      expect(container.firstChild).toHaveClass(sizeClassNameList[index]);
+      expect(container).toMatchSnapshot();
+    });
+  });
+
+  ['light', 'primary', 'dark'].forEach((item) => {
+    it(`props.theme is equal to ${item}`, () => {
+      const { container } = render(<BackTop theme={item}>Text</BackTop>);
+      expect(container.firstChild).toHaveClass(`t-back-top--theme-${item}`);
+      expect(container).toMatchSnapshot();
+    });
+  });
+
+  it('events.click works fine', () => {
+    const fn = vi.fn();
+    const { container } = render(<BackTop onClick={fn}></BackTop>);
+    fireEvent.click(container.firstChild);
+    expect(fn).toHaveBeenCalled();
+    expect(fn.mock.calls[0][0].e.stopPropagation).toBeTruthy();
+    expect(fn.mock.calls[0][0].e.type).toBe('click');
+  });
+});

src/back-top/_example/baseList.jsx

@@ -0,0 +1,33 @@
+// @ts-nocheck
+import React, { useState } from 'react';
+import { BackTop, List } from 'tdesign-react';
+
+export default function BasicBackTop() {
+  const [container, setContainer] = useState(null);
+
+  const style = {
+    position: 'absolute',
+    insetInlineEnd: 24,
+    insetBlockEnd: 80,
+  };
+
+  const listWrapStyle = {
+    width: '100%',
+    height: '280px',
+    position: 'relative',
+    overflowY: 'scroll',
+    overflowX: 'hidden',
+    border: '1px solid #dcdcdcff',
+  };
+
+  return (
+    <div style={{ position: 'relative' }}>
+      <div id='demo_1' style={listWrapStyle} ref={setContainer}>
+        <List>
+          {Array.from(Array(50), () => '列表内容').map((item, index) => <List.ListItem key={index}>{item}</List.ListItem>) }
+        </List>
+      </div>
+      <BackTop container={() => container} visibleHeight={46} style={style}></BackTop>
+    </div>
+  );
+}