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import isHotkey from 'is-hotkey'
import React, { MouseEvent, useCallback, useMemo, useState } from 'react'
import { createPortal } from 'react-dom'
import { Editor, createEditor, Descendant } from 'slate'
import { withHistory } from 'slate-history'
import {
Editable,
ReactEditor,
RenderElementProps,
RenderLeafProps,
Slate,
useSlate,
withReact,
} from 'slate-react'
import { Button, Icon, Toolbar } from './components'
import { CustomEditor, CustomTextKey } from './custom-types.d'
const HOTKEYS: Record<string, CustomTextKey> = {
'mod+b': 'bold',
'mod+i': 'italic',
'mod+u': 'underline',
'mod+`': 'code',
}
const IFrameExample = () => {
const renderElement = useCallback(
({ attributes, children }: RenderElementProps) => (
<p {...attributes}>{children}</p>
),
[]
)
const renderLeaf = useCallback(
(props: RenderLeafProps) => <Leaf {...props} />,
[]
)
const editor = useMemo(
() => withHistory(withReact(createEditor())) as CustomEditor,
[]
)
const handleBlur = useCallback(() => ReactEditor.deselect(editor), [editor])
return (
<Slate editor={editor} initialValue={initialValue}>
<Toolbar>
<MarkButton format="bold" icon="format_bold" />
<MarkButton format="italic" icon="format_italic" />
<MarkButton format="underline" icon="format_underlined" />
<MarkButton format="code" icon="code" />
</Toolbar>
<IFrame onBlur={handleBlur}>
<Editable
renderElement={renderElement}
renderLeaf={renderLeaf}
placeholder="Enter some rich text…"
spellCheck
autoFocus
onKeyDown={event => {
for (const hotkey in HOTKEYS) {
if (isHotkey(hotkey, event as any)) {
event.preventDefault()
const mark = HOTKEYS[hotkey]
toggleMark(editor, mark)
}
}
}}
/>
</IFrame>
</Slate>
)
}
const toggleMark = (editor: CustomEditor, format: CustomTextKey) => {
const isActive = isMarkActive(editor, format)
if (isActive) {
Editor.removeMark(editor, format)
} else {
Editor.addMark(editor, format, true)
}
}
const isMarkActive = (editor: CustomEditor, format: CustomTextKey) => {
const marks = Editor.marks(editor)
return marks ? marks[format] === true : false
}
const Leaf = ({ attributes, children, leaf }: RenderLeafProps) => {
if (leaf.bold) {
children = <strong>{children}</strong>
}
if (leaf.code) {
children = <code>{children}</code>
}
if (leaf.italic) {
children = <em>{children}</em>
}
if (leaf.underline) {
children = <u>{children}</u>
}
return <span {...attributes}>{children}</span>
}
interface MarkButtonProps {
format: CustomTextKey
icon: string
}
const MarkButton = ({ format, icon }: MarkButtonProps) => {
const editor = useSlate()
return (
<Button
active={isMarkActive(editor, format)}
onMouseDown={(event: MouseEvent) => {
event.preventDefault()
toggleMark(editor, format)
}}
>
<Icon>{icon}</Icon>
</Button>
)
}
interface IFrameProps extends React.IframeHTMLAttributes<HTMLIFrameElement> {
children: React.ReactNode
}
const IFrame = ({ children, ...props }: IFrameProps) => {
const [iframeBody, setIframeBody] = useState<HTMLElement | null>(null)
const handleLoad = (e: React.SyntheticEvent<HTMLIFrameElement>) => {
const iframe = e.target as HTMLIFrameElement
if (!iframe.contentDocument) return
setIframeBody(iframe.contentDocument.body)
}
return (
<iframe srcDoc={`<!DOCTYPE html>`} {...props} onLoad={handleLoad}>
{iframeBody && createPortal(children, iframeBody)}
</iframe>
)
}
const initialValue: Descendant[] = [
{
type: 'paragraph',
children: [
{
text: 'In this example, the document gets rendered into a controlled ',
},
{ text: '<iframe>', code: true },
{
text: '. This is ',
},
{
text: 'particularly',
italic: true,
},
{
text: ' useful, when you need to separate the styles for your editor contents from the ones addressing your UI.',
},
],
},
{
type: 'paragraph',
children: [
{
text: 'This also the only reliable method to preview any ',
},
{
text: 'media queries',
bold: true,
},
{
text: ' in your CSS.',
},
],
},
]
export default IFrameExample
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