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import { css } from '@emotion/css'
import React, { useCallback, useMemo } from 'react'
import {
Editor,
Point,
Range,
Element as SlateElement,
Transforms,
createEditor,
} from 'slate'
import { withHistory } from 'slate-history'
import {
Editable,
ReactEditor,
Slate,
useReadOnly,
useSlateStatic,
withReact,
} from 'slate-react'
const initialValue = [
{
type: 'paragraph',
children: [
{
text: 'With Slate you can build complex block types that have their own embedded content and behaviors, like rendering checkboxes inside check list items!',
},
],
},
{
type: 'check-list-item',
checked: true,
children: [{ text: 'Slide to the left.' }],
},
{
type: 'check-list-item',
checked: true,
children: [{ text: 'Slide to the right.' }],
},
{
type: 'check-list-item',
checked: false,
children: [{ text: 'Criss-cross.' }],
},
{
type: 'check-list-item',
checked: true,
children: [{ text: 'Criss-cross!' }],
},
{
type: 'check-list-item',
checked: false,
children: [{ text: 'Cha cha real smooth…' }],
},
{
type: 'check-list-item',
checked: false,
children: [{ text: "Let's go to work!" }],
},
{
type: 'paragraph',
children: [{ text: 'Try it out for yourself!' }],
},
]
const CheckListsExample = () => {
const renderElement = useCallback(props => <Element {...props} />, [])
const editor = useMemo(
() => withChecklists(withHistory(withReact(createEditor()))),
[]
)
return (
<Slate editor={editor} initialValue={initialValue}>
<Editable
renderElement={renderElement}
placeholder="Get to work…"
spellCheck
autoFocus
/>
</Slate>
)
}
const withChecklists = editor => {
const { deleteBackward } = editor
editor.deleteBackward = (...args) => {
const { selection } = editor
if (selection && Range.isCollapsed(selection)) {
const [match] = Editor.nodes(editor, {
match: n =>
!Editor.isEditor(n) &&
SlateElement.isElement(n) &&
n.type === 'check-list-item',
})
if (match) {
const [, path] = match
const start = Editor.start(editor, path)
if (Point.equals(selection.anchor, start)) {
const newProperties = {
type: 'paragraph',
}
Transforms.setNodes(editor, newProperties, {
match: n =>
!Editor.isEditor(n) &&
SlateElement.isElement(n) &&
n.type === 'check-list-item',
})
return
}
}
}
deleteBackward(...args)
}
return editor
}
const Element = props => {
const { attributes, children, element } = props
switch (element.type) {
case 'check-list-item':
return <CheckListItemElement {...props} />
default:
return <p {...attributes}>{children}</p>
}
}
const CheckListItemElement = ({ attributes, children, element }) => {
const { checked } = element
const editor = useSlateStatic()
const readOnly = useReadOnly()
return (
<div
{...attributes}
className={css`
display: flex;
flex-direction: row;
align-items: center;
& + & {
margin-top: 0;
}
`}
>
<span
contentEditable={false}
className={css`
margin-right: 0.75em;
`}
>
<input
type="checkbox"
checked={checked}
onChange={event => {
const path = ReactEditor.findPath(editor, element)
const newProperties = {
checked: event.target.checked,
}
Transforms.setNodes(editor, newProperties, { at: path })
}}
/>
</span>
<span
contentEditable={!readOnly}
suppressContentEditableWarning
className={css`
flex: 1;
opacity: ${checked ? 0.666 : 1};
text-decoration: ${!checked ? 'none' : 'line-through'};
&:focus {
outline: none;
}
`}
>
{children}
</span>
</div>
)
}
export default CheckListsExample
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