first

phphe · phphe · commit 884157f60bb2 · 2024-01-29T18:42:13.000+08:00
diff --git a/.eslintrc.cjs b/.eslintrc.cjs
@@ -0,0 +1,18 @@
+module.exports = {
+  root: true,
+  env: { browser: true, es2020: true },
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/recommended',
+    'plugin:react-hooks/recommended',
+  ],
+  ignorePatterns: ['dist', '.eslintrc.cjs'],
+  parser: '@typescript-eslint/parser',
+  plugins: ['react-refresh'],
+  rules: {
+    'react-refresh/only-export-components': [
+      'warn',
+      { allowConstantExport: true },
+    ],
+  },
+}
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,24 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
diff --git a/README.md b/README.md
@@ -0,0 +1,30 @@
+# React + TypeScript + Vite
+
+This template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.
+
+Currently, two official plugins are available:
+
+- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react/README.md) uses [Babel](https://babeljs.io/) for Fast Refresh
+- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react-swc) uses [SWC](https://swc.rs/) for Fast Refresh
+
+## Expanding the ESLint configuration
+
+If you are developing a production application, we recommend updating the configuration to enable type aware lint rules:
+
+- Configure the top-level `parserOptions` property like this:
+
+```js
+export default {
+  // other rules...
+  parserOptions: {
+    ecmaVersion: 'latest',
+    sourceType: 'module',
+    project: ['./tsconfig.json', './tsconfig.node.json'],
+    tsconfigRootDir: __dirname,
+  },
+}
+```
+
+- Replace `plugin:@typescript-eslint/recommended` to `plugin:@typescript-eslint/recommended-type-checked` or `plugin:@typescript-eslint/strict-type-checked`
+- Optionally add `plugin:@typescript-eslint/stylistic-type-checked`
+- Install [eslint-plugin-react](https://github.com/jsx-eslint/eslint-plugin-react) and add `plugin:react/recommended` & `plugin:react/jsx-runtime` to the `extends` list
diff --git a/index.html b/index.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Vite + React + TS</title>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.tsx"></script>
+  </body>
+</html>
diff --git a/package.json b/package.json
@@ -0,0 +1,28 @@
+{
+  "name": "he-tree-react",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc && vite build",
+    "lint": "eslint . --ext ts,tsx --report-unused-disable-directives --max-warnings 0",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0"
+  },
+  "devDependencies": {
+    "@types/react": "^18.2.43",
+    "@types/react-dom": "^18.2.17",
+    "@typescript-eslint/eslint-plugin": "^6.14.0",
+    "@typescript-eslint/parser": "^6.14.0",
+    "@vitejs/plugin-react": "^4.2.1",
+    "eslint": "^8.55.0",
+    "eslint-plugin-react-hooks": "^4.6.0",
+    "eslint-plugin-react-refresh": "^0.4.5",
+    "typescript": "^5.2.2",
+    "vite": "^5.0.8"
+  }
+}
diff --git a/src/App.css b/src/App.css
diff --git a/src/App.tsx b/src/App.tsx
@@ -0,0 +1,36 @@
+import { useMemo } from 'react'
+import './App.css'
+import { VirtualList, } from './components/VirtualList'
+
+function App() {
+  const items = useMemo(
+    () =>
+      new Array(1000).fill(1).map((v, i) => ({
+        id: i,
+        text: 'Item ' + i,
+        lineHeight: 20 + (i % 20) + 'px',
+        width: 100 + (i % 30) + 'px',
+      })),
+    [],
+  )
+
+  const styles = {
+    node: {
+      border: '1px solid #ccc',
+    },
+  }
+  return (
+    <div>
+      <div>
+        <h1>vertical</h1>
+        <VirtualList
+          items={items}
+          style={{ height: '600px' }}
+          itemSize={21}
+        ></VirtualList>
+      </div>
+    </div>
+  )
+}
+
+export default App
diff --git a/src/components/VirtualList.tsx b/src/components/VirtualList.tsx
@@ -0,0 +1,82 @@
+import React, {
+  useState,
+  useMemo,
+  useEffect,
+  useLayoutEffect,
+  useRef,
+  useCallback,
+  ReactNode,
+  createContext,
+} from 'react'
+
+export function VirtualList(
+  props,
+) {
+  const buffer = props.buffer || 100
+  let scrollTop = 0
+  const itemSize = props.itemSize || 100
+  let listSize = props.listSize || 1000
+  const count = props.items.length
+  const list = useRef(null);
+  const [visible, setvisible] = useState([]);
+  const [listInnerStyle, setlistInnerStyle] = useState(() => ({}));
+  const prevScrollTop = useRef(0);
+  const created = useRef(false);
+  // 
+  const update = () => {
+    if (created.current) {
+      scrollTop = list.current!.scrollTop
+      listSize = list.current!.clientHeight
+    }
+    const totalSpace = itemSize * count
+    let topSpace = scrollTop - buffer
+    let bottomSpace = totalSpace - scrollTop - listSize - buffer
+    let startIndex, endIndex
+
+    if (topSpace <= 0) {
+      topSpace = 0
+      startIndex = 0
+    } else {
+      startIndex = Math.floor(topSpace / itemSize)
+    }
+    if (totalSpace <= listSize) {
+      endIndex = count
+    } else {
+      endIndex = count - Math.floor(bottomSpace / itemSize)
+    }
+    if (bottomSpace < 0) {
+      bottomSpace = 0
+    }
+    const visible = props.items.slice(startIndex, endIndex)
+    let listInnerStyle = { paddingTop: `${topSpace}px`, boxSizing: 'border-box' }
+    if (bottomSpace < itemSize * 5) {
+      listInnerStyle['paddingBottom'] = `${bottomSpace}px`
+    } else {
+      listInnerStyle['height'] = `${totalSpace}px`
+    }
+    setvisible(visible)
+    setlistInnerStyle(listInnerStyle)
+  }
+  // on created
+  if (!created.current) {
+    update()
+    created.current = true;
+  }
+  const handleScroll = () => {
+    scrollTop = list.current!.scrollTop
+    if (Math.abs(prevScrollTop.current - scrollTop) > itemSize) {
+      update()
+      prevScrollTop.current = scrollTop
+    }
+  }
+  // 
+  useEffect(() => {
+    update()
+  }, []);
+  // 
+  return <div ref={list} onScroll={handleScroll} style={{ height: '500px', overflow: 'auto', }}>
+    <div style={listInnerStyle}>
+      {visible.map((item, i) => <div key={item.id}>{item.text}</div>)}
+    </div>
+  </div>
+}
diff --git a/src/index.css b/src/index.css
diff --git a/src/main.tsx b/src/main.tsx
@@ -0,0 +1,10 @@
+import React from 'react'
+import ReactDOM from 'react-dom/client'
+import App from './App.tsx'
+import './index.css'
+
+ReactDOM.createRoot(document.getElementById('root')!).render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>,
+)
diff --git a/src/vite-env.d.ts b/src/vite-env.d.ts
@@ -0,0 +1 @@
+/// <reference types="vite/client" />
diff --git a/tsconfig.json b/tsconfig.json
@@ -0,0 +1,25 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "useDefineForClassFields": true,
+    "lib": ["ES2020", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "skipLibCheck": true,
+
+    /* Bundler mode */
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "noEmit": true,
+    "jsx": "react-jsx",
+
+    /* Linting */
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true
+  },
+  "include": ["src"],
+  "references": [{ "path": "./tsconfig.node.json" }]
+}
diff --git a/tsconfig.node.json b/tsconfig.node.json
@@ -0,0 +1,10 @@
+{
+  "compilerOptions": {
+    "composite": true,
+    "skipLibCheck": true,
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "allowSyntheticDefaultImports": true
+  },
+  "include": ["vite.config.ts"]
+}
diff --git a/vite.config.ts b/vite.config.ts
@@ -0,0 +1,7 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+
+// https://vitejs.dev/config/
+export default defineConfig({
+  plugins: [react()],
+})
