1 // Copyright (C) The Arvados Authors. All rights reserved.
3 // SPDX-License-Identifier: AGPL-3.0
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 } from './ms-toolbar-overflow-menu';
11 type CssRules = 'visible' | 'inVisible' | 'toolbarWrapper' | 'overflowStyle';
13 const styles: StyleRulesCallback<CssRules> = (theme: ArvadosTheme) => ({
16 visibility: 'visible',
22 pointerEvents: 'none',
34 backgroundColor: 'white',
38 export const IntersectionObserverWrapper = withStyles(styles)((props: any & WithStyles<CssRules>) => {
39 const { classes, children} = props
41 const navRef = useRef<any>(null);
42 const [visibilityMap, setVisibilityMap] = useState({});
44 const handleIntersection = (entries) => {
45 const updatedEntries = {};
46 entries.forEach((entry) => {
47 const targetid = entry.target.dataset.targetid;
48 if (entry.isIntersecting) {
49 updatedEntries[targetid] = true;
51 updatedEntries[targetid] = false;
55 setVisibilityMap((prev) => ({
60 useEffect((): any => {
61 const observer = new IntersectionObserver(handleIntersection, {
63 rootMargin: '0px -20px 0px 0px',
66 // We are adding observers to child elements of the container div
67 // with ref as navRef. Notice that we are adding observers
68 // only if we have the data attribute targetid on the child element
70 Array.from(navRef.current.children).forEach((item: any) => {
71 if (item.dataset.targetid) {
72 observer.observe(item);
76 observer.disconnect();
81 <div className={classes.toolbarWrapper} ref={navRef}>
82 {React.Children.map(children, (child) => {
83 return React.cloneElement(child, {
84 className: classnames(child.props.className, {
85 [classes.visible]: !!visibilityMap[child.props["data-targetid"]],
86 [classes.inVisible]: !visibilityMap[child.props["data-targetid"]]
91 visibilityMap={visibilityMap}
92 className={classes.overflowStyle}