Main.js

import React from 'react'
import Undoable from './lib/Undoable'

import Schema from '@sanity/schema'
import {FormBuilder} from '../../src'
import applyPatch from '../../src/simplePatch'

const schema = Schema.compile({
  name: 'simple',
  types: [
    {
      name: 'book',
      type: 'object',
      fields: [
        {
          name: 'title',
          type: 'string',
          title: 'Book title'
        },
        {
          name: 'author',
          type: 'string',
          title: 'Name of author'
        },
        {
          name: 'isbn',
          type: 'string',
          title: 'ISBN'
        }
      ]
    }
  ]
})

export default class SimpleExample extends React.Component {
  state = {
    value: new Undoable(undefined),
    shouldInspect: false
  }
  setValue(nextValue) {
    this.setState(prevState => ({
      value: prevState.value.set(nextValue)
    }))
  }
  getValue() {
    return this.state.value
  }
  handleChange = event => {
    this.setValue(applyPatch(this.getValue(), event.patch))
  }
  undo() {
    this.setState(prevState => ({
      value: prevState.value.undo()
    }))
  }
  redo() {
    this.setState(prevState => ({
      value: prevState.value.redo()
    }))
  }
  handleCommand = event => {
    const command = event.currentTarget.dataset.command
    switch (command) {
      case 'undo':
        this.undo()
        break
      case 'redo':
        this.redo()
        break
      case 'inspect':
        this.setState(prevState => ({shouldInspect: !prevState.shouldInspect}))
        break
      default:
    }
  }
  render() {
    const {value, shouldInspect} = this.state
    return (
      <div style={{padding: 100}}>
        <div>
          <button onClick={this.handleCommand} data-command="undo" disabled={!value.canUndo}>
            Undo
          </button>
          <button onClick={this.handleCommand} data-command="redo" disabled={!value.canRedo}>
            Redo
          </button>
        </div>
        <FormBuilder schema={schema} value={value.get()} onChange={this.handleChange} />
        <div>
          <label>
            <input
              type="checkbox"
              checked={shouldInspect}
              onChange={this.handleCommand}
              data-command="inspect"
            />{' '}
            Inspect as you type
          </label>
        </div>
        {shouldInspect && <pre>{JSON.stringify(value.get(), null, 2)}</pre>}
      </div>
    )
  }
}