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import { MutableRefObject, useContext, useMemo, useReducer } from 'react'
import { Editor } from 'slate'
import { SlateSelectorContext } from './use-slate-selector'
import { useSlateStatic } from './use-slate-static'
import { useIsomorphicLayoutEffect } from './use-isomorphic-layout-effect'
/**
* Get the current editor object and re-render whenever it changes.
*/
export const useSlate = (): Editor => {
const { addEventListener } = useContext(SlateSelectorContext)
const [, forceRender] = useReducer(s => s + 1, 0)
if (!addEventListener) {
throw new Error(
`The \`useSlate\` hook must be used inside the <Slate> component's context.`
)
}
useIsomorphicLayoutEffect(
() => addEventListener(forceRender),
[addEventListener]
)
return useSlateStatic()
}
const EDITOR_TO_V = new WeakMap<Editor, MutableRefObject<number>>()
const getEditorVersionRef = (editor: Editor): MutableRefObject<number> => {
let v = EDITOR_TO_V.get(editor)
if (v) {
return v
}
v = { current: 0 }
EDITOR_TO_V.set(editor, v)
// Register the `onChange` handler exactly once per editor
const { onChange } = editor
editor.onChange = options => {
v!.current++
onChange(options)
}
return v
}
/**
* Get the current editor object and its version, which increments on every
* change.
*
* @deprecated The `v` counter is no longer used except for this hook, and may
* be removed in a future version.
*/
export const useSlateWithV = (): { editor: Editor; v: number } => {
const editor = useSlate()
const vRef = useMemo(() => getEditorVersionRef(editor), [editor])
return { editor, v: vRef.current }
}
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