slate-react: MVP for working with non-global window objects (fix for #3819) (#4079)

* mvp implementation for working with non-global window instances

* remove unused element renderer

* fix typo in comment

* fix wrong example reference

* Add @babel/helper-call-delegate to fix build error

Co-authored-by: Lukas Buenger <lukasbuenger@gmail.com>

package.json

@@ -31,6 +31,7 @@
   "devDependencies": {
     "@babel/cli": "^7.7.4",
     "@babel/core": "^7.7.4",
+    "@babel/helper-call-delegate": "^7.7.4",
     "@babel/plugin-external-helpers": "^7.7.4",
     "@babel/plugin-proposal-class-properties": "^7.7.4",
     "@babel/plugin-transform-modules-commonjs": "^7.7.4",

packages/slate-react/src/components/editable.tsx

@@ -29,6 +29,7 @@ import {
   DOMElement,
   DOMNode,
   DOMRange,
+  getDefaultView,
   isDOMElement,
   isDOMNode,
   isDOMText,
@@ -42,6 +43,7 @@ import {
   NODE_TO_ELEMENT,
   IS_FOCUSED,
   PLACEHOLDER_SYMBOL,
+  EDITOR_TO_WINDOW,
 } from '../utils/weak-maps'
 
 // COMPAT: Firefox/Edge Legacy don't support the `beforeinput` event
@@ -132,7 +134,9 @@ export const Editable = (props: EditableProps) => {
 
   // Update element-related weak maps with the DOM element ref.
   useIsomorphicLayoutEffect(() => {
-    if (ref.current) {
+    let window
+    if (ref.current && (window = getDefaultView(ref.current))) {
+      EDITOR_TO_WINDOW.set(editor, window)
       EDITOR_TO_ELEMENT.set(editor, ref.current)
       NODE_TO_ELEMENT.set(editor, ref.current)
       ELEMENT_TO_NODE.set(ref.current, editor)
@@ -144,6 +148,7 @@ export const Editable = (props: EditableProps) => {
   // Whenever the editor updates, make sure the DOM selection state is in sync.
   useIsomorphicLayoutEffect(() => {
     const { selection } = editor
+    const window = ReactEditor.getWindow(editor)
     const domSelection = window.getSelection()
 
     if (state.isComposing || !domSelection || !ReactEditor.isFocused(editor)) {
@@ -354,8 +359,9 @@ export const Editable = (props: EditableProps) => {
           case 'insertFromYank':
           case 'insertReplacementText':
           case 'insertText': {
-            if (data instanceof DataTransfer) {
+            const window = ReactEditor.getWindow(editor)
-              ReactEditor.insertData(editor, data)
+            if (data instanceof window.DataTransfer) {
+              ReactEditor.insertData(editor, data as DataTransfer)
             } else if (typeof data === 'string') {
               Editor.insertText(editor, data)
             }
@@ -394,6 +400,7 @@ export const Editable = (props: EditableProps) => {
   const onDOMSelectionChange = useCallback(
     throttle(() => {
       if (!readOnly && !state.isComposing && !state.isUpdatingSelection) {
+        const window = ReactEditor.getWindow(editor)
         const { activeElement } = window.document
         const el = ReactEditor.toDOMNode(editor, editor)
         const domSelection = window.getSelection()
@@ -436,6 +443,7 @@ export const Editable = (props: EditableProps) => {
   // fire for any change to the selection inside the editor. (2019/11/04)
   // https://github.com/facebook/react/issues/5785
   useIsomorphicLayoutEffect(() => {
+    const window = ReactEditor.getWindow(editor)
     window.document.addEventListener('selectionchange', onDOMSelectionChange)
 
     return () => {
@@ -527,6 +535,8 @@ export const Editable = (props: EditableProps) => {
               return
             }
 
+            const window = ReactEditor.getWindow(editor)
+
             // COMPAT: If the current `activeElement` is still the previous
             // one, this is due to the window being blurred when the tab
             // itself becomes unfocused, so we want to abort early to allow to
@@ -735,6 +745,7 @@ export const Editable = (props: EditableProps) => {
               !isEventHandled(event, attributes.onFocus)
             ) {
               const el = ReactEditor.toDOMNode(editor, editor)
+              const window = ReactEditor.getWindow(editor)
               state.latestElement = window.document.activeElement
 
               // COMPAT: If the editor has nested editable elements, the focus

packages/slate-react/src/plugin/react-editor.ts

@@ -10,6 +10,7 @@ import {
   NODE_TO_INDEX,
   NODE_TO_KEY,
   NODE_TO_PARENT,
+  EDITOR_TO_WINDOW,
 } from '../utils/weak-maps'
 import {
   DOMElement,
@@ -20,6 +21,7 @@ import {
   DOMStaticRange,
   isDOMElement,
   normalizeDOMPoint,
+  isDOMSelection,
 } from '../utils/dom'
 
 /**
@@ -32,6 +34,18 @@ export interface ReactEditor extends Editor {
 }
 
 export const ReactEditor = {
+  /**
+   * Return the host window of the current editor.
+   */
+
+  getWindow(editor: ReactEditor): Window {
+    const window = EDITOR_TO_WINDOW.get(editor)
+    if (!window) {
+      throw new Error('Unable to find a host window element for this editor')
+    }
+    return window
+  },
+
   /**
    * Find a key for a Slate node.
    */
@@ -104,7 +118,7 @@ export const ReactEditor = {
   blur(editor: ReactEditor): void {
     const el = ReactEditor.toDOMNode(editor, editor)
     IS_FOCUSED.set(editor, false)
-
+    const window = ReactEditor.getWindow(editor)
     if (window.document.activeElement === el) {
       el.blur()
     }
@@ -118,6 +132,7 @@ export const ReactEditor = {
     const el = ReactEditor.toDOMNode(editor, editor)
     IS_FOCUSED.set(editor, true)
 
+    const window = ReactEditor.getWindow(editor)
     if (window.document.activeElement !== el) {
       el.focus({ preventScroll: true })
     }
@@ -129,6 +144,7 @@ export const ReactEditor = {
 
   deselect(editor: ReactEditor): void {
     const { selection } = editor
+    const window = ReactEditor.getWindow(editor)
     const domSelection = window.getSelection()
 
     if (domSelection && domSelection.rangeCount > 0) {
@@ -284,6 +300,7 @@ export const ReactEditor = {
       ? domAnchor
       : ReactEditor.toDOMPoint(editor, focus)
 
+    const window = ReactEditor.getWindow(editor)
     const domRange = window.document.createRange()
     const [startNode, startOffset] = isBackward ? domFocus : domAnchor
     const [endNode, endOffset] = isBackward ? domAnchor : domFocus
@@ -410,6 +427,7 @@ export const ReactEditor = {
       // can determine what the offset relative to the text node is.
       if (leafNode) {
         textNode = leafNode.closest('[data-slate-node="text"]')!
+        const window = ReactEditor.getWindow(editor)
         const range = window.document.createRange()
         range.setStart(textNode, 0)
         range.setEnd(nearestNode, nearestOffset)
@@ -476,8 +494,7 @@ export const ReactEditor = {
     editor: ReactEditor,
     domRange: DOMRange | DOMStaticRange | DOMSelection
   ): Range {
-    const el =
+    const el = isDOMSelection(domRange)
-      domRange instanceof Selection
       ? domRange.anchorNode
       : domRange.startContainer
     let anchorNode
@@ -487,7 +504,7 @@ export const ReactEditor = {
     let isCollapsed
 
     if (el) {
-      if (domRange instanceof Selection) {
+      if (isDOMSelection(domRange)) {
         anchorNode = domRange.anchorNode
         anchorOffset = domRange.anchorOffset
         focusNode = domRange.focusNode

packages/slate-react/src/utils/dom.ts

@@ -23,8 +23,26 @@ export {
   DOMStaticRange,
 }
 
+declare global {
+  interface Window {
+    Selection: typeof Selection['constructor']
+    DataTransfer: typeof DataTransfer['constructor']
+    Node: typeof Node['constructor']
+  }
+}
+
 export type DOMPoint = [Node, number]
 
+/**
+ * Returns the host window of a DOM node
+ */
+
+export const getDefaultView = (value: any): Window | null => {
+  return (
+    (value && value.ownerDocument && value.ownerDocument.defaultView) || null
+  )
+}
+
 /**
  * Check if a DOM node is a comment node.
  */
@@ -46,7 +64,17 @@ export const isDOMElement = (value: any): value is DOMElement => {
  */
 
 export const isDOMNode = (value: any): value is DOMNode => {
-  return value instanceof Node
+  const window = getDefaultView(value)
+  return !!window && value instanceof window.Node
+}
+
+/**
+ * Check if a value is a DOM selection.
+ */
+
+export const isDOMSelection = (value: any): value is DOMSelection => {
+  const window = value && value.anchorNode && getDefaultView(value.anchorNode)
+  return !!window && value instanceof window.Selection
 }
 
 /**

packages/slate-react/src/utils/weak-maps.ts

@@ -14,7 +14,7 @@ export const NODE_TO_PARENT: WeakMap<Node, Ancestor> = new WeakMap()
  * Weak maps that allow us to go between Slate nodes and DOM nodes. These
  * are used to resolve DOM event-related logic into Slate actions.
  */
-
+export const EDITOR_TO_WINDOW: WeakMap<Editor, Window> = new WeakMap()
 export const EDITOR_TO_ELEMENT: WeakMap<Editor, HTMLElement> = new WeakMap()
 export const EDITOR_TO_PLACEHOLDER: WeakMap<Editor, string> = new WeakMap()
 export const ELEMENT_TO_NODE: WeakMap<HTMLElement, Node> = new WeakMap()

site/examples/iframe.js

@@ -0,0 +1,158 @@
+import React, { useCallback, useMemo, useState } from 'react'
+import { createPortal } from 'react-dom'
+import isHotkey from 'is-hotkey'
+import { Editable, withReact, useSlate, Slate, ReactEditor } from 'slate-react'
+import { Editor, createEditor } from 'slate'
+import { withHistory } from 'slate-history'
+
+import { Button, Icon, Toolbar } from '../components'
+
+const HOTKEYS = {
+  'mod+b': 'bold',
+  'mod+i': 'italic',
+  'mod+u': 'underline',
+  'mod+`': 'code',
+}
+
+const IFrameExample = () => {
+  const [value, setValue] = useState(initialValue)
+  const renderElement = useCallback(
+    ({ attributes, children }) => <p {...attributes}>{children}</p>,
+    []
+  )
+  const renderLeaf = useCallback(props => <Leaf {...props} />, [])
+  const editor = useMemo(() => withHistory(withReact(createEditor())), [])
+
+  const handleBlur = useCallback(() => ReactEditor.deselect(editor), [editor])
+
+  return (
+    <Slate editor={editor} value={value} onChange={value => setValue(value)}>
+      <Toolbar>
+        <MarkButton format="bold" icon="format_bold" />
+        <MarkButton format="italic" icon="format_italic" />
+        <MarkButton format="underline" icon="format_underlined" />
+        <MarkButton format="code" icon="code" />
+      </Toolbar>
+      <IFrame onBlur={handleBlur}>
+        <Editable
+          renderElement={renderElement}
+          renderLeaf={renderLeaf}
+          placeholder="Enter some rich text…"
+          spellCheck
+          autoFocus
+          onKeyDown={event => {
+            for (const hotkey in HOTKEYS) {
+              if (isHotkey(hotkey, event)) {
+                event.preventDefault()
+                const mark = HOTKEYS[hotkey]
+                toggleMark(editor, mark)
+              }
+            }
+          }}
+        />
+      </IFrame>
+    </Slate>
+  )
+}
+
+const toggleMark = (editor, format) => {
+  const isActive = isMarkActive(editor, format)
+  if (isActive) {
+    Editor.removeMark(editor, format)
+  } else {
+    Editor.addMark(editor, format, true)
+  }
+}
+
+const isMarkActive = (editor, format) => {
+  const marks = Editor.marks(editor)
+  return marks ? marks[format] === true : false
+}
+
+const Leaf = ({ attributes, children, leaf }) => {
+  if (leaf.bold) {
+    children = <strong>{children}</strong>
+  }
+
+  if (leaf.code) {
+    children = <code>{children}</code>
+  }
+
+  if (leaf.italic) {
+    children = <em>{children}</em>
+  }
+
+  if (leaf.underline) {
+    children = <u>{children}</u>
+  }
+
+  return <span {...attributes}>{children}</span>
+}
+
+const MarkButton = ({ format, icon }) => {
+  const editor = useSlate()
+  return (
+    <Button
+      active={isMarkActive(editor, format)}
+      onMouseDown={event => {
+        event.preventDefault()
+        toggleMark(editor, format)
+      }}
+    >
+      <Icon>{icon}</Icon>
+    </Button>
+  )
+}
+
+const IFrame = ({ children, ...props }) => {
+  const [contentRef, setContentRef] = useState(null)
+  const mountNode =
+    contentRef &&
+    contentRef.contentWindow &&
+    contentRef.contentWindow.document.body
+  return (
+    <iframe {...props} ref={setContentRef}>
+      {mountNode && createPortal(React.Children.only(children), mountNode)}
+    </iframe>
+  )
+}
+
+const initialValue = [
+  {
+    type: 'paragraph',
+    children: [
+      {
+        text: 'In this example, the document gets rendered into a controlled ',
+      },
+      { text: '<iframe>', code: true },
+      {
+        text: '. This is ',
+      },
+      {
+        text: 'particularly',
+        italic: true,
+      },
+      {
+        text:
+          ' useful, when you need to separate the styles for your editor contents from the ones addressing your UI.',
+      },
+    ],
+  },
+  {
+    type: 'paragraph',
+    children: [
+      {
+        text: 'This also the only reliable method to preview any ',
+      },
+      {
+        text: 'media queries',
+        bold: true,
+      },
+      {
+        text: ' in your CSS.',
+      },
+    ],
+  },
+]
+
+export default IFrameExample

site/pages/examples/[example].tsx

@@ -25,6 +25,7 @@ import RichText from '../../examples/richtext'
 import SearchHighlighting from '../../examples/search-highlighting'
 import CodeHighlighting from '../../examples/code-highlighting'
 import Tables from '../../examples/tables'
+import IFrames from '../../examples/iframe'
 
 // node
 import { getAllExamples } from '../api'
@@ -48,6 +49,7 @@ const EXAMPLES = [
   ['Search Highlighting', SearchHighlighting, 'search-highlighting'],
   ['Code Highlighting', CodeHighlighting, 'code-highlighting'],
   ['Tables', Tables, 'tables'],
+  ['Rendering in iframes', IFrames, 'iframe'],
 ]
 
 const Header = props => (

site/public/index.css

@@ -70,6 +70,11 @@ input:focus {
   border-color: blue;
 }
 
+iframe {
+  width: 100%;
+  border: 1px solid #eee;
+}
+
 [data-slate-editor] > * + * {
   margin-top: 1em;
 }

yarn.lock

@@ -191,6 +191,14 @@
     "@babel/helper-annotate-as-pure" "^7.10.4"
     "@babel/types" "^7.10.4"
 
+"@babel/helper-call-delegate@^7.7.4":
+  version "7.12.13"
+  resolved "https://registry.yarnpkg.com/@babel/helper-call-delegate/-/helper-call-delegate-7.12.13.tgz#119ef367451f90bed006c685816ba60fc33fee78"
+  integrity sha512-K1kF0RXK/GpdS9OZDlBllG0+RQQtyzG/TC+nk0VkrUry4l4Xh2T7HdDsDOVlXQY/KcqvE/JQ84pKjKucdrg3FQ==
+  dependencies:
+    "@babel/helper-hoist-variables" "^7.12.13"
+    "@babel/types" "^7.12.13"
+
 "@babel/helper-compilation-targets@^7.10.4", "@babel/helper-compilation-targets@^7.9.6":
   version "7.10.4"
   resolved "https://registry.yarnpkg.com/@babel/helper-compilation-targets/-/helper-compilation-targets-7.10.4.tgz#804ae8e3f04376607cc791b9d47d540276332bd2"
@@ -263,6 +271,13 @@
   dependencies:
     "@babel/types" "^7.10.4"
 
+"@babel/helper-hoist-variables@^7.12.13":
+  version "7.12.13"
+  resolved "https://registry.yarnpkg.com/@babel/helper-hoist-variables/-/helper-hoist-variables-7.12.13.tgz#13aba58b7480b502362316ea02f52cca0e9796cd"
+  integrity sha512-KSC5XSj5HreRhYQtZ3cnSnQwDzgnbdUDEFsxkN0m6Q3WrCRt72xrnZ8+h+pX7YxM7hr87zIO3a/v5p/H3TrnVw==
+  dependencies:
+    "@babel/types" "^7.12.13"
+
 "@babel/helper-member-expression-to-functions@^7.10.4", "@babel/helper-member-expression-to-functions@^7.10.5":
   version "7.11.0"
   resolved "https://registry.yarnpkg.com/@babel/helper-member-expression-to-functions/-/helper-member-expression-to-functions-7.11.0.tgz#ae69c83d84ee82f4b42f96e2a09410935a8f26df"
@@ -357,6 +372,11 @@
   resolved "https://registry.yarnpkg.com/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.4.tgz#a78c7a7251e01f616512d31b10adcf52ada5e0d2"
   integrity sha512-3U9y+43hz7ZM+rzG24Qe2mufW5KhvFg/NhnNph+i9mgCtdTCtMJuI1TMkrIUiK7Ix4PYlRF9I5dhqaLYA/ADXw==
 
+"@babel/helper-validator-identifier@^7.12.11":
+  version "7.12.11"
+  resolved "https://registry.yarnpkg.com/@babel/helper-validator-identifier/-/helper-validator-identifier-7.12.11.tgz#c9a1f021917dcb5ccf0d4e453e399022981fc9ed"
+  integrity sha512-np/lG3uARFybkoHokJUmf1QfEvRVCPbmQeUQpKow5cQ3xWrV9i3rUHodKDJPQfTVX61qKi+UdYk8kik84n7XOw==
+
 "@babel/helper-wrap-function@^7.10.4":
   version "7.10.4"
   resolved "https://registry.yarnpkg.com/@babel/helper-wrap-function/-/helper-wrap-function-7.10.4.tgz#8a6f701eab0ff39f765b5a1cfef409990e624b87"
@@ -1275,6 +1295,15 @@
     lodash "^4.17.19"
     to-fast-properties "^2.0.0"
 
+"@babel/types@^7.12.13":
+  version "7.12.13"
+  resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.12.13.tgz#8be1aa8f2c876da11a9cf650c0ecf656913ad611"
+  integrity sha512-oKrdZTld2im1z8bDwTOQvUbxKwE+854zc16qWZQlcTqMN00pWxHQ4ZeOq0yDMnisOpRykH2/5Qqcrk/OlbAjiQ==
+  dependencies:
+    "@babel/helper-validator-identifier" "^7.12.11"
+    lodash "^4.17.19"
+    to-fast-properties "^2.0.0"
+
 "@emotion/cache@^10.0.27":
   version "10.0.29"
   resolved "https://registry.yarnpkg.com/@emotion/cache/-/cache-10.0.29.tgz#87e7e64f412c060102d589fe7c6dc042e6f9d1e0"