[EuiDataGrid] InMemory Performance

src-docs/src/views/datagrid/datagrid.js

@@ -1,12 +1,21 @@
-import React, { Component, Fragment, useEffect } from 'react';
+import React, {
+  Fragment,
+  useCallback,
+  useEffect,
+  useMemo,
+  useState,
+} from 'react';
 import { fake } from 'faker';
 
 import {
+  EuiButton,
   EuiDataGrid,
   EuiButtonIcon,
   EuiLink,
+  EuiPopover,
 } from '../../../../src/components/';
 import { iconTypes } from '../../../../src-docs/src/views/icon/icons';
+import { EuiRadioGroup } from '../../../../src/components/form/radio';
 
 const columns = [
   {
@@ -38,10 +47,10 @@ const columns = [
   },
 ];
 
-const data = [];
+const raw_data = [];
 
-for (let i = 1; i < 100; i++) {
-  data.push({
+for (let i = 1; i < 1000; i++) {
+  raw_data.push({
     name: fake('{{name.lastName}}, {{name.firstName}} {{name.suffix}}'),
     email: <EuiLink href="">{fake('{{internet.email}}')}</EuiLink>,
     location: (
@@ -72,22 +81,39 @@ for (let i = 1; i < 100; i++) {
   });
 }
 
-export default class DataGridContainer extends Component {
-  constructor(props) {
-    super(props);
-
-    this.state = {
-      sortingColumns: [],
-      data,
-      pagination: {
-        pageIndex: 0,
-        pageSize: 50,
-      },
-    };
-  }
+export default () => {
+  const [isPopoverOpen, setIsPopoverOpen] = useState(false);
+
+  // ** Pagination config
+  const [pagination, setPagination] = useState({ pageIndex: 0, pageSize: 25 });
+  const onChangeItemsPerPage = useCallback(
+    pageSize => setPagination(pagination => ({ ...pagination, pageSize })),
+    [setPagination]
+  );
+  const onChangePage = useCallback(
+    pageIndex => setPagination(pagination => ({ ...pagination, pageIndex })),
+    [setPagination]
+  );
+
+  // ** Sorting config
+  const [sortingColumns, setSortingColumns] = useState([]);
+  const onSort = useCallback(
+    sortingColumns => {
+      setSortingColumns(sortingColumns);
+    },
+    [setSortingColumns]
+  );
 
-  setSorting = sortingColumns => {
-    const sortedData = [...data].sort((a, b) => {
+  const [inMemoryLevel, setInMemoryLevel] = useState('');
+
+  // Sort data
+  let data = useMemo(() => {
+    // the grid itself is responsible for sorting if inMemory is `sorting`
+    if (inMemoryLevel === 'sorting') {
+      return raw_data;
+    }
+
+    return [...raw_data].sort((a, b) => {
       for (let i = 0; i < sortingColumns.length; i++) {
         const column = sortingColumns[i];
         const aValue = a[column.id];
@@ -99,58 +125,117 @@ export default class DataGridContainer extends Component {
 
       return 0;
     });
-    this.setState({ sortingColumns, data: sortedData });
-  };
-
-  setPageIndex = pageIndex =>
-    this.setState(({ pagination }) => ({
-      pagination: { ...pagination, pageIndex },
-    }));
-
-  setPageSize = pageSize =>
-    this.setState(({ pagination }) => ({
-      pagination: { ...pagination, pageSize },
-    }));
-
-  dummyIcon = () => (
-    <EuiButtonIcon
-      aria-label="dummy icon"
-      iconType={iconTypes[Math.floor(Math.random() * iconTypes.length)]}
-    />
-  );
+  }, [raw_data, sortingColumns, inMemoryLevel]);
+
+  // Pagination
+  data = useMemo(() => {
+    // the grid itself is responsible for sorting if inMemory is sorting or pagination
+    if (inMemoryLevel === 'sorting' || inMemoryLevel === 'pagination') {
+      return data;
+    }
+
+    const rowStart = pagination.pageIndex * pagination.pageSize;
+    const rowEnd = Math.min(rowStart + pagination.pageSize, data.length);
+    return data.slice(rowStart, rowEnd);
+  }, [data, pagination, inMemoryLevel]);
+
+  const renderCellValue = useMemo(() => {
+    return ({ rowIndex, columnId, setCellProps }) => {
+      let adjustedRowIndex = rowIndex;
 
-  render() {
-    const { data, pagination, sortingColumns } = this.state;
+      // If we are doing the pagination (instead of leaving that to the grid)
+      // then the row index must be adjusted as `data` has already been pruned to the page size
+      if (inMemoryLevel !== 'sorting' && inMemoryLevel !== 'pagination') {
+        adjustedRowIndex =
+          rowIndex - pagination.pageIndex * pagination.pageSize;
+      }
+
+      useEffect(() => {
+        if (columnId === 'amount') {
+          if (data.hasOwnProperty(adjustedRowIndex)) {
+            const numeric = parseFloat(
+              data[adjustedRowIndex][columnId].match(/\d+\.\d+/)[0],
+              10
+            );
+            setCellProps({
+              style: {
+                backgroundColor: `rgba(0, ${(numeric / 1000) * 255}, 0, 0.2)`,
+              },
+            });
+          }
+        }
+      }, [adjustedRowIndex, columnId, setCellProps]);
+
+      return data.hasOwnProperty(adjustedRowIndex)
+        ? data[adjustedRowIndex][columnId]
+        : null;
+    };
+  }, [data, inMemoryLevel]);
+
+  const inMemoryProps = {};
+  if (inMemoryLevel !== '') {
+    inMemoryProps.inMemory = {
+      level: inMemoryLevel,
+      skipColumns: ['actions'],
+    };
+  }
+
+  return (
+    <div>
+      <EuiPopover
+        isOpen={isPopoverOpen}
+        button={
+          <EuiButton onClick={() => setIsPopoverOpen(state => !state)}>
+            inMemory options
+          </EuiButton>
+        }
+        closePopover={() => setIsPopoverOpen(false)}>
+        <EuiRadioGroup
+          compressed={true}
+          options={[
+            {
+              id: '',
+              label: 'off',
+              value: '',
+            },
+            {
+              id: 'enhancements',
+              label: 'only enhancements',
+              value: 'enhancements',
+            },
+            {
+              id: 'pagination',
+              label: 'only pagination',
+              value: 'pagination',
+            },
+            {
+              id: 'sorting',
+              label: 'sorting and pagination',
+              value: 'sorting',
+            },
+          ]}
+          idSelected={inMemoryLevel}
+          onChange={(id, value) => {
+            setInMemoryLevel(value === '' ? undefined : value);
+            setIsPopoverOpen(false);
+          }}
+        />
+      </EuiPopover>
 
-    return (
       <EuiDataGrid
         aria-label="Data grid demo"
         columns={columns}
-        rowCount={data.length}
-        renderCellValue={({ rowIndex, columnId, setCellProps }) => {
-          useEffect(() => {
-            if (columnId === 'amount') {
-              const numeric = parseFloat(
-                data[rowIndex][columnId].match(/\d+\.\d+/)[0],
-                10
-              );
-              setCellProps({
-                style: {
-                  backgroundColor: `rgba(0, ${(numeric / 1000) * 255}, 0, 0.2)`,
-                },
-              });
-            }
-          }, [rowIndex, columnId, setCellProps]);
-          return data[rowIndex][columnId];
-        }}
-        sorting={{ columns: sortingColumns, onSort: this.setSorting }}
+        rowCount={raw_data.length}
+        renderCellValue={renderCellValue}
+        {...inMemoryProps}
+        sorting={{ columns: sortingColumns, onSort }}
         pagination={{
           ...pagination,
-          pageSizeOptions: [5, 10, 25],
-          onChangeItemsPerPage: this.setPageSize,
-          onChangePage: this.setPageIndex,
+          pageSizeOptions: [10, 25, 50, 100],
+          onChangeItemsPerPage: onChangeItemsPerPage,
+          onChangePage: onChangePage,
         }}
       />
-    );
-  }
-}
+    </div>
+  );
+};

src-docs/src/views/datagrid/in_memory.js

@@ -91,7 +91,7 @@ export default class InMemoryDataGrid extends Component {
           const value = data[rowIndex][columnId];
           return value;
         }}
-        inMemory="sorting"
+        inMemory={{ level: 'pagination' }}
         sorting={{ columns: sortingColumns, onSort: this.setSorting }}
         pagination={{
           ...pagination,