refactor: add window example for react, update docs (#614)

docs/api/virtualizer.md

@@ -136,14 +136,6 @@ rangeExtractor?: (range: Range) => number[]
 
 This function receives visible range indexes and should return array of indexes to render. This is useful if you need to add or remove items from the virtualizer manually regardless of the visible range, eg. rendering sticky items, headers, footers, etc. The default range extractor implementation will return the visible range indexes and is exported as `defaultRangeExtractor`.
 
-### `enableSmoothScroll`
-
-```tsx
-enableSmoothScroll?: boolean
-```
-
-Enables/disables smooth scrolling. Smooth scrolling is enabled by default, but may result in inaccurate landing positions when dynamically measuring elements (a common use case and configuration). If you plan to use smooth scrolling, it's suggested that you either estimate the size of your elements as close to their maximums as possible, or simply turn off dynamic measuring of elements.
-
 ### `scrollToFn`
 
 ```tsx
@@ -193,6 +185,15 @@ This optional function is called when the virtualizer needs to dynamically measu
 
 > 🧠 You can use `instance.options.horizontal` to determine if the width or height of the item should be measured.
 
+### `scrollMargin`
+
+```tsx
+scrollMargin?: number
+```
+
+With this option, you can specify where the scroll offset should originate. Typically, this value represents the space between the beginning of the scrolling element and the start of the list. This is especially useful in common scenarios such as when you have a header preceding a window virtualizer or when multiple virtualizers are utilized within a single scrolling element.
+
+
 ## Virtualizer Instance
 
 The following properties and methods are available on the virtualizer instance:
@@ -303,3 +304,11 @@ lanes: number
 ```
 
 The number of lanes the list is divided into (aka columns for vertical lists and rows for horizontal lists).
+
+### `scrollRect`
+
+```tsx
+scrollRect: Rect
+```
+
+Current `Rect` of the scroll element.

docs/config.json

@@ -38,7 +38,8 @@
         { "to": "examples/react/sticky", "label": "Sticky" },
         { "to": "examples/react/infinite-scroll", "label": "Infinite Scroll" },
         { "to": "examples/react/smooth-scroll", "label": "Smooth Scroll" },
-        { "to": "examples/react/table", "label": "Table" }
+        { "to": "examples/react/table", "label": "Table" },
+        { "to": "examples/react/window", "label": "Window" }
       ]
     },
     {

examples/react/dynamic/src/main.tsx

@@ -99,61 +99,6 @@ function RowVirtualizerDynamic() {
   )
 }
 
-const RowVirtualizerDynamicWindow = () => {
-  const parentRef = React.useRef<HTMLDivElement>(null)
-
-  const parentOffsetRef = React.useRef(0)
-
-  React.useLayoutEffect(() => {
-    parentOffsetRef.current = parentRef.current?.offsetTop ?? 0
-  }, [])
-
-  const virtualizer = useWindowVirtualizer({
-    count: sentences.length,
-    estimateSize: () => 45,
-    scrollMargin: parentOffsetRef.current,
-  })
-  const items = virtualizer.getVirtualItems()
-
-  return (
-    <div ref={parentRef} className="List">
-      <div
-        style={{
-          height: virtualizer.getTotalSize(),
-          width: '100%',
-          position: 'relative',
-        }}
-      >
-        <div
-          style={{
-            position: 'absolute',
-            top: 0,
-            left: 0,
-            width: '100%',
-            transform: `translateY(${
-              items[0] ? items[0].start - virtualizer.options.scrollMargin : 0
-            }px)`,
-          }}
-        >
-          {items.map((virtualRow) => (
-            <div
-              key={virtualRow.key}
-              data-index={virtualRow.index}
-              ref={virtualizer.measureElement}
-              className={virtualRow.index % 2 ? 'ListItemOdd' : 'ListItemEven'}
-            >
-              <div style={{ padding: '10px 0' }}>
-                <div>Row {virtualRow.index}</div>
-                <div>{sentences[virtualRow.index]}</div>
-              </div>
-            </div>
-          ))}
-        </div>
-      </div>
-    </div>
-  )
-}
-
 function ColumnVirtualizerDynamic() {
   const parentRef = React.useRef<HTMLDivElement | null>(null)
 
@@ -366,8 +311,6 @@ function App() {
             return <RowVirtualizerDynamic />
           case '/columns':
             return <ColumnVirtualizerDynamic />
-          case '/window-list':
-            return <RowVirtualizerDynamicWindow />
           case '/grid': {
             const columns = generateColumns(30)
             const data = generateData(columns)

examples/react/window/.gitignore

@@ -0,0 +1,5 @@
+node_modules
+.DS_Store
+dist
+dist-ssr
+*.local

examples/react/window/README.md

@@ -0,0 +1,6 @@
+# Example
+
+To run this example:
+
+- `npm install` or `yarn`
+- `npm run start` or `yarn start`

examples/react/window/index.html

@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.tsx"></script>
+  </body>
+</html>

examples/react/window/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "window",
+  "private": true,
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc && vite build",
+    "serve": "vite preview"
+  },
+  "dependencies": {
+    "@tanstack/react-virtual": "3.0.0-beta.66",
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0"
+  },
+  "devDependencies": {
+    "@rollup/plugin-replace": "^5.0.2",
+    "@types/node": "18.x",
+    "@types/react": "^18.0.27",
+    "@types/react-dom": "^18.0.10",
+    "@vitejs/plugin-react": "^3.0.1",
+    "typescript": "^4.9.5",
+    "vite": "^4.0.4"
+  }
+}

examples/react/window/src/index.css

@@ -0,0 +1,28 @@
+html {
+  font-family: sans-serif;
+  font-size: 14px;
+}
+
+body {
+  padding: 1rem;
+}
+
+.List {
+  border: 1px solid #e6e4dc;
+  max-width: 100%;
+}
+
+.ListItemEven,
+.ListItemOdd {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.ListItemEven {
+  background-color: #e6e4dc;
+}
+
+button {
+  border: 1px solid gray;
+}

examples/react/window/src/main.tsx

@@ -0,0 +1,82 @@
+import * as React from 'react'
+import * as ReactDOM from 'react-dom/client'
+
+import './index.css'
+
+import { useWindowVirtualizer } from '@tanstack/react-virtual'
+
+function Example() {
+  const listRef = React.useRef<HTMLDivElement | null>(null)
+
+  const virtualizer = useWindowVirtualizer({
+    count: 10000,
+    estimateSize: () => 35,
+    overscan: 5,
+    scrollMargin: listRef.current?.offsetTop ?? 0,
+  })
+
+  return (
+    <>
+      <div ref={listRef} className="List">
+        <div
+          style={{
+            height: `${virtualizer.getTotalSize()}px`,
+            width: '100%',
+            position: 'relative',
+          }}
+        >
+          {virtualizer.getVirtualItems().map((item) => (
+            <div
+              key={item.key}
+              className={item.index % 2 ? 'ListItemOdd' : 'ListItemEven'}
+              style={{
+                position: 'absolute',
+                top: 0,
+                left: 0,
+                width: '100%',
+                height: `${item.size}px`,
+                transform: `translateY(${
+                  item.start - virtualizer.options.scrollMargin
+                }px)`,
+              }}
+            >
+              Row {item.index}
+            </div>
+          ))}
+        </div>
+      </div>
+    </>
+  )
+}
+
+function App() {
+  return (
+    <div>
+      <p>
+        In many cases, when implementing a virtualizer with a window as the
+        scrolling element, developers often find the need to specify a
+        "scrollMargin." The scroll margin is a crucial setting that defines the
+        space or gap between the start of the page and the edges of the list.
+      </p>
+      <br />
+      <br />
+      <h3>Window scroller</h3>
+      <Example />
+      <br />
+      <br />
+      {process.env.NODE_ENV === 'development' ? (
+        <p>
+          <strong>Notice:</strong> You are currently running React in
+          development mode. Rendering performance will be slightly degraded
+          until this application is build for production.
+        </p>
+      ) : null}
+    </div>
+  )
+}
+
+ReactDOM.createRoot(document.getElementById('root')!).render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>,
+)

examples/react/window/tsconfig.dev.json

@@ -0,0 +1,12 @@
+{
+  "composite": true,
+  "extends": "../../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "./build/types"
+  },
+  "files": ["src/main.tsx"],
+  "include": [
+    "src"
+    // "__tests__/**/*.test.*"
+  ]
+}

examples/react/window/vite.config.js

@@ -0,0 +1,7 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+
+// https://vitejs.dev/config/
+export default defineConfig({
+  plugins: [react()],
+})