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import { css } from '@emotion/css'
import imageExtensions from 'image-extensions'
import isHotkey from 'is-hotkey'
import isUrl from 'is-url'
import React, { useMemo } from 'react'
import { Transforms, createEditor } from 'slate'
import { withHistory } from 'slate-history'
import {
Editable,
ReactEditor,
Slate,
useFocused,
useSelected,
useSlateStatic,
withReact,
} from 'slate-react'
import { Button, Icon, Toolbar } from './components'
const ImagesExample = () => {
const editor = useMemo(
() => withImages(withHistory(withReact(createEditor()))),
[]
)
return (
<Slate editor={editor} initialValue={initialValue}>
<Toolbar>
<InsertImageButton />
</Toolbar>
<Editable
onKeyDown={event => {
if (isHotkey('mod+a', event)) {
event.preventDefault()
Transforms.select(editor, [])
}
}}
renderElement={props => <Element {...props} />}
placeholder="Enter some text..."
/>
</Slate>
)
}
const withImages = editor => {
const { insertData, isVoid } = editor
editor.isVoid = element => {
return element.type === 'image' ? true : isVoid(element)
}
editor.insertData = data => {
const text = data.getData('text/plain')
const { files } = data
if (files && files.length > 0) {
Array.from(files).forEach(file => {
const reader = new FileReader()
const [mime] = file.type.split('/')
if (mime === 'image') {
reader.addEventListener('load', () => {
const url = reader.result
insertImage(editor, url)
})
reader.readAsDataURL(file)
}
})
} else if (isImageUrl(text)) {
insertImage(editor, text)
} else {
insertData(data)
}
}
return editor
}
const insertImage = (editor, url) => {
const text = { text: '' }
const image = { type: 'image', url, children: [text] }
Transforms.insertNodes(editor, image)
const paragraph = {
type: 'paragraph',
children: [{ text: '' }],
}
Transforms.insertNodes(editor, paragraph)
}
const Element = props => {
const { attributes, children, element } = props
switch (element.type) {
case 'image':
return <Image {...props} />
default:
return <p {...attributes}>{children}</p>
}
}
const Image = ({ attributes, children, element }) => {
const editor = useSlateStatic()
const path = ReactEditor.findPath(editor, element)
const selected = useSelected()
const focused = useFocused()
return (
<div {...attributes}>
{children}
<div
contentEditable={false}
className={css`
position: relative;
`}
>
<img
src={element.url}
className={css`
display: block;
max-width: 100%;
max-height: 20em;
box-shadow: ${selected && focused ? '0 0 0 3px #B4D5FF' : 'none'};
`}
/>
<Button
active
onClick={() => Transforms.removeNodes(editor, { at: path })}
className={css`
display: ${selected && focused ? 'inline' : 'none'};
position: absolute;
top: 0.5em;
left: 0.5em;
background-color: white;
`}
>
<Icon>delete</Icon>
</Button>
</div>
</div>
)
}
const InsertImageButton = () => {
const editor = useSlateStatic()
return (
<Button
onMouseDown={event => {
event.preventDefault()
const url = window.prompt('Enter the URL of the image:')
if (url && !isImageUrl(url)) {
alert('URL is not an image')
return
}
url && insertImage(editor, url)
}}
>
<Icon>image</Icon>
</Button>
)
}
const isImageUrl = url => {
if (!url) return false
if (!isUrl(url)) return false
const ext = new URL(url).pathname.split('.').pop()
return imageExtensions.includes(ext)
}
const initialValue = [
{
type: 'paragraph',
children: [
{
text: 'In addition to nodes that contain editable text, you can also create other types of nodes, like images or videos.',
},
],
},
{
type: 'image',
url: 'https://source.unsplash.com/kFrdX5IeQzI',
children: [{ text: '' }],
},
{
type: 'paragraph',
children: [
{
text: 'This example shows images in action. It features two ways to add images. You can either add an image via the toolbar icon above, or if you want in on a little secret, copy an image URL to your clipboard and paste it anywhere in the editor!',
},
],
},
{
type: 'paragraph',
children: [
{
text: 'You can delete images with the cross in the top left. Try deleting this sheep:',
},
],
},
{
type: 'image',
url: 'https://source.unsplash.com/zOwZKwZOZq8',
children: [{ text: '' }],
},
]
export default ImagesExample
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