Add ReactEditor.isComposing(editor) (#4981)

* Add ReactEditor.isComposing(editor)

* Upate changeset from patch to minor

.changeset/odd-cats-tie.md

@@ -0,0 +1,5 @@
+---
+'slate-react': minor
+---
+
+Add `ReactEditor.isComposing(editor)` to get the current `isComposing` state

docs/libraries/slate-react.md

@@ -104,6 +104,10 @@ Get the current editor object from the React context. A version of useSlate that
 
 A React and DOM-specific version of the `Editor` interface. All about translating between the DOM and Slate.
 
+### `isComposing(editor: ReactEditor)`
+
+Check if the user is currently composing inside the editor.
+
 ### `findKey(editor: ReactEditor, node: Node)`
 
 Find a key for a Slate node.

packages/slate-react/src/components/android/android-input-manager.ts

@@ -1,7 +1,6 @@
 import { ReactEditor } from '../../plugin/react-editor'
 import { Editor, Range, Transforms, Text } from 'slate'
 import {
-  IS_COMPOSING,
   IS_ON_COMPOSITION_END,
   EDITOR_ON_COMPOSITION_TEXT,
 } from '../../utils/weak-maps'
@@ -113,7 +112,7 @@ export class AndroidInputManager {
     // If it is in composing or after `onCompositionend`, set `EDITOR_ON_COMPOSITION_TEXT` and return.
     // Text will be inserted on compositionend event.
     if (
-      IS_COMPOSING.get(this.editor) ||
+      ReactEditor.isComposing(this.editor) ||
       IS_ON_COMPOSITION_END.get(this.editor)
     ) {
       EDITOR_ON_COMPOSITION_TEXT.set(this.editor, insertedText)

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

@@ -54,6 +54,7 @@ import {
   PLACEHOLDER_SYMBOL,
   EDITOR_TO_WINDOW,
   EDITOR_TO_USER_SELECTION,
+  IS_COMPOSING,
 } from '../utils/weak-maps'
 import { TRIPLE_CLICK } from '../utils/constants'
 
@@ -141,7 +142,6 @@ export const Editable = (props: EditableProps) => {
   // Keep track of some state for the event handler logic.
   const state = useMemo(
     () => ({
-      isComposing: false,
       hasInsertPrefixInCompositon: false,
       isDraggingInternally: false,
       isUpdatingSelection: false,
@@ -168,7 +168,11 @@ export const Editable = (props: EditableProps) => {
     const root = ReactEditor.findDocumentOrShadowRoot(editor)
     const domSelection = root.getSelection()
 
-    if (state.isComposing || !domSelection || !ReactEditor.isFocused(editor)) {
+    if (
+      ReactEditor.isComposing(editor) ||
+      !domSelection ||
+      !ReactEditor.isFocused(editor)
+    ) {
       return
     }
 
@@ -268,7 +272,7 @@ export const Editable = (props: EditableProps) => {
   const onDOMSelectionChange = useCallback(
     throttle(() => {
       if (
-        !state.isComposing &&
+        !ReactEditor.isComposing(editor) &&
         !state.isUpdatingSelection &&
         !state.isDraggingInternally
       ) {
@@ -516,8 +520,10 @@ export const Editable = (props: EditableProps) => {
               // then we will abort because we're still composing and the selection
               // won't be updated properly.
               // https://www.w3.org/TR/input-events-2/
-              state.isComposing && setIsComposing(false)
-              state.isComposing = false
+              if (ReactEditor.isComposing(editor)) {
+                setIsComposing(false)
+                IS_COMPOSING.set(editor, false)
+              }
             }
 
             // use a weak comparison instead of 'instanceof' to allow
@@ -674,7 +680,7 @@ export const Editable = (props: EditableProps) => {
                 hasEditableTarget(editor, event.target)
               ) {
                 event.preventDefault()
-                if (!state.isComposing) {
+                if (!ReactEditor.isComposing(editor)) {
                   const text = (event as any).data as string
                   Editor.insertText(editor, text)
                 }
@@ -822,8 +828,10 @@ export const Editable = (props: EditableProps) => {
                 hasEditableTarget(editor, event.target) &&
                 !isEventHandled(event, attributes.onCompositionEnd)
               ) {
-                state.isComposing && setIsComposing(false)
-                state.isComposing = false
+                if (ReactEditor.isComposing(editor)) {
+                  setIsComposing(false)
+                  IS_COMPOSING.set(editor, false)
+                }
 
                 // COMPAT: In Chrome, `beforeinput` events for compositions
                 // aren't correct and never fire the "insertFromComposition"
@@ -867,8 +875,10 @@ export const Editable = (props: EditableProps) => {
                 hasEditableTarget(editor, event.target) &&
                 !isEventHandled(event, attributes.onCompositionUpdate)
               ) {
-                !state.isComposing && setIsComposing(true)
-                state.isComposing = true
+                if (!ReactEditor.isComposing(editor)) {
+                  setIsComposing(true)
+                  IS_COMPOSING.set(editor, true)
+                }
               }
             },
             [attributes.onCompositionUpdate]
@@ -1096,14 +1106,17 @@ export const Editable = (props: EditableProps) => {
                 // COMPAT: The composition end event isn't fired reliably in all browsers,
                 // so we sometimes might end up stuck in a composition state even though we
                 // aren't composing any more.
-                if (state.isComposing && nativeEvent.isComposing === false) {
-                  state.isComposing = false
+                if (
+                  ReactEditor.isComposing(editor) &&
+                  nativeEvent.isComposing === false
+                ) {
+                  IS_COMPOSING.set(editor, false)
                   setIsComposing(false)
                 }
 
                 if (
                   isEventHandled(event, attributes.onKeyDown) ||
-                  state.isComposing
+                  ReactEditor.isComposing(editor)
                 ) {
                   return
                 }

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

@@ -11,6 +11,7 @@ import {
   NODE_TO_PARENT,
   EDITOR_TO_WINDOW,
   EDITOR_TO_KEY_TO_ELEMENT,
+  IS_COMPOSING,
 } from '../utils/weak-maps'
 import {
   DOMElement,
@@ -42,6 +43,14 @@ export interface ReactEditor extends BaseEditor {
 }
 
 export const ReactEditor = {
+  /**
+   * Check if the user is currently composing inside the editor.
+   */
+
+  isComposing(editor: ReactEditor): boolean {
+    return !!IS_COMPOSING.get(editor)
+  },
+
   /**
    * Return the host window of the current editor.
    */