From 5a5bfd6c42539f72d03ec0b1670636ce9fb4b590 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Mon, 28 Jun 2021 22:46:39 -0700
Subject: Virtualize device list

---
 modern/src/DevicesList.js | 70 +++++++++++++++++++++++++++++++----------------
 1 file changed, 47 insertions(+), 23 deletions(-)

(limited to 'modern/src/DevicesList.js')

diff --git a/modern/src/DevicesList.js b/modern/src/DevicesList.js
index 976fd84..f66d717 100644
--- a/modern/src/DevicesList.js
+++ b/modern/src/DevicesList.js
@@ -10,6 +10,8 @@ import ListItemAvatar from '@material-ui/core/ListItemAvatar';
 import ListItemSecondaryAction from '@material-ui/core/ListItemSecondaryAction';
 import ListItemText from '@material-ui/core/ListItemText';
 import MoreVertIcon from '@material-ui/icons/MoreVert';
+import { FixedSizeList } from 'react-window';
+import AutoSizer from 'react-virtualized-auto-sizer';
 
 import { devicesActions } from './store';
 import EditCollectionView from './EditCollectionView';
@@ -18,7 +20,6 @@ import { useEffectAsync } from './reactHelper';
 const useStyles = makeStyles(() => ({
   list: {
     maxHeight: '100%',
-    overflow: 'auto',
   },
   icon: {
     width: '25px',
@@ -27,6 +28,35 @@ const useStyles = makeStyles(() => ({
   },
 }));
 
+const DeviceRow = ({ data, index, style }) => {
+  const classes = useStyles();
+  const dispatch = useDispatch();
+
+  const { items, onMenuClick } = data;
+  const item = items[index];
+  
+  return (
+    <div style={style}>
+      <Fragment key={index}>
+        <ListItem button key={item.id} onClick={() => dispatch(devicesActions.select(item))}>
+          <ListItemAvatar>
+            <Avatar>
+              <img className={classes.icon} src={`images/icon/${item.category || 'default'}.svg`} alt="" />
+            </Avatar>
+          </ListItemAvatar>
+          <ListItemText primary={item.name} secondary={item.uniqueId} />
+          <ListItemSecondaryAction>
+            <IconButton onClick={(event) => onMenuClick(event.currentTarget, item.id)}>
+              <MoreVertIcon />
+            </IconButton>
+          </ListItemSecondaryAction>
+        </ListItem>
+        {index < items.length - 1 ? <Divider /> : null}
+      </Fragment>
+    </div>
+  );
+};
+
 const DeviceView = ({ updateTimestamp, onMenuClick }) => {
   const classes = useStyles();
   const dispatch = useDispatch();
@@ -41,33 +71,27 @@ const DeviceView = ({ updateTimestamp, onMenuClick }) => {
   }, [updateTimestamp]);
 
   return (
-    <List className={classes.list}>
-      {items.map((item, index, list) => (
-        <Fragment key={item.id}>
-          <ListItem button key={item.id} onClick={() => dispatch(devicesActions.select(item))}>
-            <ListItemAvatar>
-              <Avatar>
-                <img className={classes.icon} src={`images/icon/${item.category || 'default'}.svg`} alt="" />
-              </Avatar>
-            </ListItemAvatar>
-            <ListItemText primary={item.name} secondary={item.uniqueId} />
-            <ListItemSecondaryAction>
-              <IconButton onClick={(event) => onMenuClick(event.currentTarget, item.id)}>
-                <MoreVertIcon />
-              </IconButton>
-            </ListItemSecondaryAction>
-          </ListItem>
-          {index < list.length - 1 ? <Divider /> : null}
-        </Fragment>
-      ))}
-    </List>
+    <AutoSizer className={classes.list}>
+      {({ height, width }) => (
+        <List disablePadding>
+          <FixedSizeList
+            width={width}
+            height={height}
+            itemCount={items.length}
+            itemData={{ items, onMenuClick }}
+            itemSize={72 + 1} >
+            {DeviceRow}
+          </FixedSizeList>
+        </List>
+      )}
+    </AutoSizer>
   );
-}
+};
 
 const DevicesList = () => {
   return (
     <EditCollectionView content={DeviceView} editPath="/device" endpoint="devices" />
   );
-}
+};
 
 export default DevicesList;
-- 
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