Support custom scrollIntoView from user side. (#4037)

simplify scroll into view call

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

@@ -91,6 +91,7 @@ export type EditableProps = {
   renderElement?: (props: RenderElementProps) => JSX.Element
   renderLeaf?: (props: RenderLeafProps) => JSX.Element
   renderPlaceholder?: (props: RenderPlaceholderProps) => JSX.Element
+  scrollSelectionIntoView?: (editor: ReactEditor, domRange: DOMRange) => void
   as?: React.ElementType
 } & React.TextareaHTMLAttributes<HTMLDivElement>
 
@@ -108,6 +109,7 @@ export const Editable = (props: EditableProps) => {
     renderElement,
     renderLeaf,
     renderPlaceholder = props => <DefaultPlaceholder {...props} />,
+    scrollSelectionIntoView = defaultScrollSelectionIntoView,
     style = {},
     as: Component = 'div',
     ...attributes
@@ -192,7 +194,6 @@ export const Editable = (props: EditableProps) => {
     }
 
     // Otherwise the DOM selection is out of sync, so update it.
-    const el = ReactEditor.toDOMNode(editor, editor)
     state.isUpdatingSelection = true
 
     const newDomRange = selection && ReactEditor.toDOMRange(editor, selection)
@@ -213,15 +214,7 @@ export const Editable = (props: EditableProps) => {
           newDomRange.endOffset
         )
       }
-      const leafEl = newDomRange.startContainer.parentElement!
-      leafEl.getBoundingClientRect = newDomRange.getBoundingClientRect.bind(
-        newDomRange
-      )
-      scrollIntoView(leafEl, {
-        scrollMode: 'if-needed',
-      })
-      // @ts-ignore
-      delete leafEl.getBoundingClientRect
+      scrollSelectionIntoView(editor, newDomRange)
     } else {
       domSelection.removeAllRanges()
     }
@@ -230,6 +223,7 @@ export const Editable = (props: EditableProps) => {
       // COMPAT: In Firefox, it's not enough to create a range, you also need
       // to focus the contenteditable element too. (2016/11/16)
       if (newDomRange && IS_FIREFOX) {
+        const el = ReactEditor.toDOMNode(editor, editor)
         el.focus()
       }
 
@@ -1169,6 +1163,22 @@ export const DefaultPlaceholder = ({
 
 export const defaultDecorate: (entry: NodeEntry) => Range[] = () => []
 
+/**
+ * A default implement to scroll dom range into view.
+ */
+
+const defaultScrollSelectionIntoView = (
+  editor: ReactEditor,
+  domRange: DOMRange
+) => {
+  const leafEl = domRange.startContainer.parentElement!
+  leafEl.getBoundingClientRect = domRange.getBoundingClientRect.bind(domRange)
+  scrollIntoView(leafEl, {
+    scrollMode: 'if-needed',
+  })
+  delete leafEl.getBoundingClientRect
+}
+
 /**
  * Check if two DOM range objects are equal.
  */