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 0px 0 20px',
  28         width: '100%',
  29     },
  30     overflowStyle: {
  31         order: 99,
  32         position: 'sticky',
  33         right: '-2rem',
  34         width: 0,
  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<Record<string, boolean>>({});
  48     const [numHidden, setNumHidden] = useState(() => findNumHidden(visibilityMap));
  49
  50     const prevNumHidden = useRef(numHidden);
  51
  52     const handleIntersection = (entries) => {
  53         const updatedEntries: Record<string, boolean> = {};
  54         entries.forEach((entry) => {
  55             const targetid = entry.target.dataset.targetid as string;
  56             if (entry.isIntersecting) {
  57                 updatedEntries[targetid] = true;
  58             } else {
  59                 updatedEntries[targetid] = false;
  60             }
  61         });
  62
  63         setVisibilityMap((prev) => ({
  64             ...prev,
  65             ...updatedEntries,
  66             [lastEntryId]: Object.keys(updatedEntries)[0] === lastEntryId,
  67         }));
  68     };
  69
  70     useEffect(() => {
  71         if (prevNumHidden.current === 2 && numHidden === 1) {
  72             setVisibilityMap((prev) => ({
  73                 ...prev,
  74                 [lastEntryId]: true,
  75             }));
  76         }
  77         prevNumHidden.current = numHidden;
  78     }, [numHidden, lastEntryId]);
  79
  80     useEffect(() => {
  81         setNumHidden(findNumHidden(visibilityMap));
  82     }, [visibilityMap]);
  83
  84     useEffect((): any => {
  85         setVisibilityMap({});
  86         const observer = new IntersectionObserver(handleIntersection, {
  87             root: navRef.current,
  88             rootMargin: '0px -30px 0px 0px',
  89             threshold: 1,
  90         });
  91         // We are adding observers to child elements of the container div
  92         // with ref as navRef. Notice that we are adding observers
  93         // only if we have the data attribute targetid on the child element
  94         if (navRef.current)
  95             Array.from(navRef.current.children).forEach((item: any) => {
  96                 if (item.dataset.targetid) {
  97                     observer.observe(item);
  98                 }
  99             });
 100         return () => {
 101             observer.disconnect();
 102         };
 103         // eslint-disable-next-line
 104     }, [menuLength]);
 105
 106     function findNumHidden(visMap: {}) {
 107         return Object.values(visMap).filter((x) => x === false).length;
 108     }
 109
 110     return (
 111         <div
 112             className={classes.toolbarWrapper}
 113             ref={navRef}
 114         >
 115             {React.Children.map(children, (child) => {
 116                 return React.cloneElement(child, {
 117                     className: classnames(child.props.className, {
 118                         [classes.visible]: !!visibilityMap[child.props['data-targetid']],
 119                         [classes.inVisible]: !visibilityMap[child.props['data-targetid']],
 120                     }),
 121                 });
 122             })}
 123             {numHidden >= 2 && (
 124                 <OverflowMenu
 125                     visibilityMap={visibilityMap}
 126                     className={classes.overflowStyle}
 127                 >
 128                     {children}
 129                 </OverflowMenu>
 130             )}
 131         </div>
 132     );
 133 });