docs: add drag handle demo for React (#5783)

demos/src/GuideNodeViews/DragHandle/React/Component.jsx

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+import { NodeViewContent, NodeViewWrapper } from '@tiptap/react'
+import React from 'react'
+
+export default () => {
+  return (
+    <NodeViewWrapper className="draggable-item">
+      <div className="drag-handle" contentEditable={false} draggable="true" data-drag-handle />
+      <NodeViewContent className="content" />
+    </NodeViewWrapper>
+  )
+}

demos/src/GuideNodeViews/DragHandle/React/DraggableItem.js

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+import { mergeAttributes, Node } from '@tiptap/core'
+import { ReactNodeViewRenderer } from '@tiptap/react'
+
+import Component from './Component.jsx'
+
+export default Node.create({
+  name: 'draggableItem',
+
+  group: 'block',
+
+  content: 'block+',
+
+  draggable: true,
+
+  parseHTML() {
+    return [
+      {
+        tag: 'div[data-type="draggable-item"]',
+      },
+    ]
+  },
+
+  renderHTML({ HTMLAttributes }) {
+    return ['div', mergeAttributes(HTMLAttributes, { 'data-type': 'draggable-item' }), 0]
+  },
+
+  addNodeView() {
+    return ReactNodeViewRenderer(Component)
+  },
+})

demos/src/GuideNodeViews/DragHandle/React/index.jsx

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+import './styles.scss'
+
+import { EditorProvider } from '@tiptap/react'
+import StarterKit from '@tiptap/starter-kit'
+import React from 'react'
+
+import DraggableItem from './DraggableItem.js'
+
+const extensions = [
+  StarterKit,
+  DraggableItem,
+]
+
+const content = `
+        <p>This is a boring paragraph.</p>
+        <div data-type="draggable-item">
+          <p>Followed by a fancy draggable item.</p>
+        </div>
+        <div data-type="draggable-item">
+          <p>And another draggable item.</p>
+          <div data-type="draggable-item">
+            <p>And a nested one.</p>
+            <div data-type="draggable-item">
+              <p>But can we go deeper?</p>
+            </div>
+          </div>
+        </div>
+        <p>Let’s finish with a boring paragraph.</p>
+      `
+
+export default () => {
+  return <EditorProvider extensions={extensions} content={content}></EditorProvider>
+}

demos/src/GuideNodeViews/DragHandle/React/styles.scss

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+/* Basic editor styles */
+.tiptap {
+  :first-child {
+    margin-top: 0;
+  }
+
+  /* List styles */
+  ul,
+  ol {
+    padding: 0 1rem;
+    margin: 1.25rem 1rem 1.25rem 0.4rem;
+
+    li p {
+      margin-top: 0.25em;
+      margin-bottom: 0.25em;
+    }
+  }
+
+  /* Heading styles */
+  h1,
+  h2,
+  h3,
+  h4,
+  h5,
+  h6 {
+    line-height: 1.1;
+    margin-top: 2.5rem;
+    text-wrap: pretty;
+  }
+
+  h1,
+  h2 {
+    margin-top: 3.5rem;
+    margin-bottom: 1.5rem;
+  }
+
+  h1 {
+    font-size: 1.4rem;
+  }
+
+  h2 {
+    font-size: 1.2rem;
+  }
+
+  h3 {
+    font-size: 1.1rem;
+  }
+
+  h4,
+  h5,
+  h6 {
+    font-size: 1rem;
+  }
+
+  /* Code and preformatted text styles */
+  code {
+    background-color: var(--purple-light);
+    border-radius: 0.4rem;
+    color: var(--black);
+    font-size: 0.85rem;
+    padding: 0.25em 0.3em;
+  }
+
+  pre {
+    background: var(--black);
+    border-radius: 0.5rem;
+    color: var(--white);
+    font-family: "JetBrainsMono", monospace;
+    margin: 1.5rem 0;
+    padding: 0.75rem 1rem;
+
+    code {
+      background: none;
+      color: inherit;
+      font-size: 0.8rem;
+      padding: 0;
+    }
+  }
+
+  blockquote {
+    border-left: 3px solid var(--gray-3);
+    margin: 1.5rem 0;
+    padding-left: 1rem;
+  }
+
+  hr {
+    border: none;
+    border-top: 1px solid var(--gray-2);
+    margin: 2rem 0;
+  }
+
+  // Focus styles
+  .has-focus {
+    border-radius: 3px;
+    box-shadow: 0 0 0 2px var(--purple);
+  }
+}
+
+.draggable-item {
+  display: flex;
+  padding: 0.5rem;
+  margin: 0.5rem 0;
+  border-radius: 0.5rem;
+  background: white;
+  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.05), 0px 10px 20px rgba(0, 0, 0, 0.1);
+
+  .drag-handle {
+    flex: 0 0 auto;
+    position: relative;
+    width: 1rem;
+    height: 1rem;
+    top: 0.3rem;
+    margin-right: 0.5rem;
+    cursor: grab;
+    background-image: url('data:image/svg+xml;charset=UTF-8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 10 16"><path fill-opacity="0.2" d="M4 14c0 1.1-.9 2-2 2s-2-.9-2-2 .9-2 2-2 2 .9 2 2zM2 6C.9 6 0 6.9 0 8s.9 2 2 2 2-.9 2-2-.9-2-2-2zm0-6C.9 0 0 .9 0 2s.9 2 2 2 2-.9 2-2-.9-2-2-2zm6 4c1.1 0 2-.9 2-2s-.9-2-2-2-2 .9-2 2 .9 2 2 2zm0 2c-1.1 0-2 .9-2 2s.9 2 2 2 2-.9 2-2-.9-2-2-2zm0 6c-1.1 0-2 .9-2 2s.9 2 2 2 2-.9 2-2-.9-2-2-2z" /></svg>');
+    background-repeat: no-repeat;
+    background-size: contain;
+    background-position: center;
+  }
+
+  .content {
+    flex: 1 1 auto;
+  }
+}