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fix: useMemo in menus #1253

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fix: useMemo in menus #1253

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22c0b58
fix: useMemo in menus
jorgeart81 Jul 2, 2024
6ab066b
Set menuMemo in mobile
jorgeart81 Jul 2, 2024
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6 changes: 4 additions & 2 deletions src/common/components/PageLayout.jsx
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
import React, { useState } from 'react';
import React, { useMemo, useState } from 'react';
import {
AppBar,
Breadcrumbs,
Expand Down Expand Up @@ -74,6 +74,8 @@ const PageLayout = ({ menu, breadcrumbs, children }) => {

const [openDrawer, setOpenDrawer] = useState(false);

const menuMemo = useMemo(() => menu, []);

return desktop ? (
<div className={classes.desktopRoot}>
<Drawer
Expand All @@ -88,7 +90,7 @@ const PageLayout = ({ menu, breadcrumbs, children }) => {
<PageTitle breadcrumbs={breadcrumbs} />
</Toolbar>
<Divider />
{menu}
{menuMemo}
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Shouldn't the same thing be done in mobile layout?

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Also, how does it actually prevent re-rendering? Because the menu is still passed as a parameter every time. Have you verified that it actually works?

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It does not render again because in this case the useMemo has an empty dependency [ ].
I share the video of the tests.

Video

2024-07-02.00-48-07.mp4

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The menu won't be re-rendered, but the page will, no?

I'm not sure I understand what I'm supposed to see on the video, but I see re-rendering around 4th second.

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Yes, the page is rendered by the websocket because I have GPS connected to the traccar server.
The socket updates the state of the store, and this generates the render. Don't worry, it's part of React.
Version 19 is close and will bring performance improvements.

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But I don't understand what I'm supposed to see in the video.

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Previously all items in the report navigation menu were rendered with each socket update. With useMemo it no longer happens.

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@tananaev tananaev Jul 2, 2024 •
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I thought the problem was with re-rendering the map, not the menu. Why would re-rendering the menu a problem?

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I thought that was what you were referring to in the comment #1251 (comment)

I agree with you, menu rendering is not a problem.

Also thank you for your time, because these days I am understanding your platform better.

</Drawer>
<div className={classes.content}>{children}</div>
</div>
Expand Down
6 changes: 4 additions & 2 deletions src/settings/components/EditItemView.jsx
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
import React from 'react';
import React, { useMemo } from 'react';
import { useNavigate, useParams } from 'react-router-dom';
import {
Container, Button, Accordion, AccordionDetails, AccordionSummary, Skeleton, Typography, TextField,
Expand Down Expand Up @@ -54,8 +54,10 @@ const EditItemView = ({
}
});

const menuMemo = useMemo(() => menu, []);

return (
<PageLayout menu={menu} breadcrumbs={breadcrumbs}>
<PageLayout menu={menuMemo} breadcrumbs={breadcrumbs}>
<Container maxWidth="xs" className={classes.container}>
{item ? children : (
<Accordion defaultExpanded>
Expand Down