services/workbench2/src/components/multiselect-toolbar/ms-toolbar-overflow-wrapper.tsx

   1 // Copyright (C) The Arvados Authors. All rights reserved.
   2 //
   3 // SPDX-License-Identifier: AGPL-3.0
   4
   5 import React, { useState, useRef, useEffect } from 'react';
   6 import { StyleRulesCallback, WithStyles, withStyles } from '@material-ui/core';
   7 import classnames from 'classnames';
   8 import { ArvadosTheme } from 'common/custom-theme';
   9 import { OverflowMenu, OverflowChild } from './ms-toolbar-overflow-menu';
  10
  11 type CssRules = 'visible' | 'inVisible' | 'toolbarWrapper' | 'overflowStyle';
  12
  13 const styles: StyleRulesCallback<CssRules> = (theme: ArvadosTheme) => ({
  14     visible: {
  15         order: 0,
  16         visibility: 'visible',
  17         opacity: 1,
  18     },
  19     inVisible: {
  20         order: 100,
  21         visibility: 'hidden',
  22         pointerEvents: 'none',
  23     },
  24     toolbarWrapper: {
  25         display: 'flex',
  26         overflow: 'hidden',
  27         padding: '0 20px',
  28         width: '100%',
  29     },
  30     overflowStyle: {
  31         order: 99,
  32         position: 'sticky',
  33         right: '-2rem',
  34         backgroundColor: 'white',
  35     },
  36 });
  37
  38 type WrapperProps = {
  39     children: OverflowChild[];
  40     menuLength: number;
  41 };
  42
  43 export const IntersectionObserverWrapper = withStyles(styles)((props: WrapperProps & WithStyles<CssRules>) => {
  44     const { classes, children, menuLength } = props;
  45     const lastEntryId = (children[menuLength - 1] as any).props['data-targetid'];
  46     const navRef = useRef<any>(null);
  47     const [visibilityMap, setVisibilityMap] = useState({});
  48
  49     const handleIntersection = (entries) => {
  50         const updatedEntries = {};
  51         entries.forEach((entry) => {
  52             const targetid = entry.target.dataset.targetid;
  53             if (entry.isIntersecting) {
  54                 updatedEntries[targetid] = true;
  55             } else {
  56                 updatedEntries[targetid] = false;
  57             }
  58         });
  59
  60         setVisibilityMap((prev) => ({
  61                 ...prev,
  62                 ...updatedEntries,
  63                 [lastEntryId]: Object.keys(updatedEntries)[0] === lastEntryId,
  64             })
  65         );
  66     };
  67
  68     useEffect((): any => {
  69         setVisibilityMap({})
  70         const observer = new IntersectionObserver(handleIntersection, {
  71             root: navRef.current,
  72             rootMargin: '0px -20px 0px 0px',
  73             threshold: 1,
  74         });
  75         // We are adding observers to child elements of the container div
  76         // with ref as navRef. Notice that we are adding observers
  77         // only if we have the data attribute targetid on the child element
  78         if (navRef.current)
  79             Array.from(navRef.current.children).forEach((item: any) => {
  80                 if (item.dataset.targetid) {
  81                     observer.observe(item);
  82                 }
  83             });
  84         return () => {
  85             observer.disconnect();
  86         };
  87         // eslint-disable-next-line
  88     }, [menuLength]);
  89
  90     const numHidden = (visMap: {}) => {
  91         return Object.values(visMap).filter((x) => x === false).length;
  92     };
  93
  94     return (
  95         <div
  96             className={classes.toolbarWrapper}
  97             ref={navRef}
  98         >
  99             {React.Children.map(children, (child) => {
 100                 return React.cloneElement(child, {
 101                     className: classnames(child.props.className, {
 102                         [classes.visible]: !!visibilityMap[child.props['data-targetid']],
 103                         [classes.inVisible]: !visibilityMap[child.props['data-targetid']],
 104                     }),
 105                 });
 106             })}
 107             {numHidden(visibilityMap) >= 2 && (
 108                 <OverflowMenu
 109                     visibilityMap={visibilityMap}
 110                     className={classes.overflowStyle}
 111                 >
 112                     {children}
 113                 </OverflowMenu>
 114             )}
 115         </div>
 116     );
 117 });