ant-design-vue/components/vc-tabs/src/TabPane.jsx

import { defineComponent, inject } from 'vue';
import PropTypes from '../../_util/vue-types';
import { getComponent, getSlot } from '../../_util/props-util';
import Sentinel from './Sentinel';

export default defineComponent({
  name: 'TabPane',
  props: {
    active: PropTypes.looseBool,
    destroyInactiveTabPane: PropTypes.looseBool,
    forceRender: PropTypes.looseBool,
    placeholder: PropTypes.any,
    rootPrefixCls: PropTypes.string,
    tab: PropTypes.any,
    closable: PropTypes.looseBool,
    disabled: PropTypes.looseBool,
  },
  setup() {
    return {
      isActived: undefined,
      sentinelContext: inject('sentinelContext', {}),
    };
  },
  render() {
    const { destroyInactiveTabPane, active, forceRender, rootPrefixCls } = this.$props;
    const children = getSlot(this);
    const placeholder = getComponent(this, 'placeholder');
    this.isActived = this.isActived || active;
    const prefixCls = `${rootPrefixCls}-tabpane`;
    const cls = {
      [prefixCls]: 1,
      [`${prefixCls}-inactive`]: !active,
      [`${prefixCls}-active`]: active,
    };
    const isRender = destroyInactiveTabPane ? active : this.isActived;
    const shouldRender = isRender || forceRender;
    const {
      sentinelStart,
      sentinelEnd,
      setPanelSentinelStart,
      setPanelSentinelEnd,
    } = this.sentinelContext;
    let panelSentinelStart;
    let panelSentinelEnd;
    if (active && shouldRender) {
      panelSentinelStart = <Sentinel setRef={setPanelSentinelStart} prevElement={sentinelStart} />;
      panelSentinelEnd = <Sentinel setRef={setPanelSentinelEnd} nextElement={sentinelEnd} />;
    }
    return (
      <div class={cls} role="tabpanel" aria-hidden={active ? 'false' : 'true'}>
        {panelSentinelStart}
        {shouldRender ? children : placeholder}
        {panelSentinelEnd}
      </div>
    );
  },
});