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Replace custom gist implementation with github rendering (#1436)
* Replace custom gist implementation with github rendering Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>
This commit is contained in:
Tilman Vatteroth
GitHub
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64443a3b64
commit
dee494386a
4 changed files with 143 additions and 60 deletions
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@ -91,6 +91,7 @@ SPDX-License-Identifier: CC-BY-SA-4.0
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- Change editor font to "Fira Code"
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- Note tags can be set as yaml-array in frontmatter.
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- If only one external login provider is configured, the sign-in button will directly link to it.
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- Links in Gist-Frames work only if explicitly opened in new tabs.
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---
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@ -9,3 +9,18 @@
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filter: blur(3px);
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}
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}
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.gist-resizer-row {
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display: flex;
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justify-content: center;
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.gist-resizer {
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display: flex;
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width: 48px;
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height: 5px;
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background: white;
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border-radius: 90px;
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cursor: row-resize;
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box-shadow: black 0 0 3px;
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}
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}
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@ -4,77 +4,43 @@
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SPDX-License-Identifier: AGPL-3.0-only
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*/
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import React, { useCallback, useEffect, useMemo, useState } from 'react'
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import React, { useCallback } from 'react'
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import './gist-frame.scss'
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import { useResizeGistFrame } from './use-resize-gist-frame'
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export interface GistFrameProps {
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id: string
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}
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interface resizeEvent {
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size: number
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id: string
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}
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/**
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* This component renders a GitHub Gist by placing the gist URL in an {@link HTMLIFrameElement iframe}.
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*
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* @param id The id of the gist
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*/
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export const GistFrame: React.FC<GistFrameProps> = ({ id }) => {
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const iframeHtml = useMemo(() => {
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return `
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<html lang="en">
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<head>
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<base target="_parent">
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<title>gist</title>
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<style>
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* { font-size:12px; }
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body{ overflow:hidden; margin: 0;}
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</style>
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<script type="text/javascript">
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function doLoad() {
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window.parent.postMessage({eventType: 'gistResize', size: document.body.scrollHeight, id: '${id}'}, '*')
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tweakLinks();
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}
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function tweakLinks() {
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document.querySelectorAll(".gist-meta > a").forEach((link) => {
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link.rel="noopener noreferer"
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link.target="_blank"
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})
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}
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</script>
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</head>
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<body onload="doLoad()">
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<script type="text/javascript" src="https://gist.github.com/${id}.js"></script>
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</body>
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</html>`
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}, [id])
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const [frameHeight, onStartResizing] = useResizeGistFrame(150)
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const [frameHeight, setFrameHeight] = useState(0)
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const sizeMessage = useCallback(
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(message: MessageEvent) => {
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const data = message.data as resizeEvent
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if (data.id !== id) {
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return
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}
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setFrameHeight(data.size)
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const onStart = useCallback(
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(event) => {
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onStartResizing(event)
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},
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[id]
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[onStartResizing]
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)
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useEffect(() => {
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window.addEventListener('message', sizeMessage)
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return () => {
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window.removeEventListener('message', sizeMessage)
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}
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}, [sizeMessage])
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return (
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<iframe
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sandbox='allow-scripts allow-top-navigation-by-user-activation allow-popups'
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data-cy={'gh-gist'}
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width='100%'
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height={`${frameHeight}px`}
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frameBorder='0'
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title={`gist ${id}`}
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src={`data:text/html;base64,${btoa(iframeHtml)}`}
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/>
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<span>
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<iframe
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sandbox=''
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data-cy={'gh-gist'}
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width='100%'
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height={`${frameHeight}px`}
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frameBorder='0'
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title={`gist ${id}`}
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src={`https://gist.github.com/${id}.pibb`}
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/>
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<span className={'gist-resizer-row'}>
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<span className={'gist-resizer'} onMouseDown={onStart} onTouchStart={onStart} />
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</span>
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</span>
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)
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}
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@ -0,0 +1,101 @@
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/*
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* SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
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*
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* SPDX-License-Identifier: AGPL-3.0-only
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*/
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import { useCallback, useEffect, useRef, useState } from 'react'
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/**
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* Determines if the left mouse button is pressed in the given event
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*
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* @param mouseEvent the mouse event that should be checked
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* @return {@code true} if the left mouse button is pressed. {@code false} otherwise.
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*/
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const isLeftMouseButtonPressed = (mouseEvent: MouseEvent): boolean => {
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return mouseEvent.buttons === 1
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}
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/**
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* Extracts the absolute vertical position of the mouse or touch point from the event.
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*
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* @param moveEvent the vertical position of the mouse pointer or the first touch pointer.
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* @return the extracted vertical position.
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*/
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const extractVerticalPointerPosition = (moveEvent: MouseEvent | TouchEvent): number => {
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if (isMouseEvent(moveEvent)) {
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return moveEvent.pageY
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} else {
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return moveEvent.touches[0]?.pageY
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}
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}
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/**
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* Checks if the given {@link Event} is a {@link MouseEvent}
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* @param event the event to check
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* @return {@code true} if the given event is a {@link MouseEvent}
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*/
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const isMouseEvent = (event: Event): event is MouseEvent => {
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return (event as MouseEvent).buttons !== undefined
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}
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export type PointerEvent = MouseEvent | TouchEvent
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export type PointerEventHandler = (event: PointerEvent) => void
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/**
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* Provides logic for resizing a {@link GistFrame gist frame} by dragging an element.
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*
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* @param initialFrameHeight The initial size for the frame
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* @return An array containing the current frame height and function to start the resizing
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*/
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export const useResizeGistFrame = (initialFrameHeight: number): [number, PointerEventHandler] => {
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const [frameHeight, setFrameHeight] = useState(initialFrameHeight)
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const lastYPosition = useRef<number | undefined>(undefined)
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const onMove = useCallback((moveEvent: MouseEvent | TouchEvent) => {
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if (lastYPosition.current === undefined) {
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return
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}
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if (isMouseEvent(moveEvent) && !isLeftMouseButtonPressed(moveEvent)) {
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lastYPosition.current = undefined
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moveEvent.preventDefault()
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return undefined
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}
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const currentPointerPosition = extractVerticalPointerPosition(moveEvent)
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const deltaPointerPosition = currentPointerPosition - lastYPosition.current
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lastYPosition.current = currentPointerPosition
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setFrameHeight((oldFrameHeight) => Math.max(0, oldFrameHeight + deltaPointerPosition))
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moveEvent.preventDefault()
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}, [])
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const onStartResizing: PointerEventHandler = useCallback((event) => {
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lastYPosition.current = extractVerticalPointerPosition(event)
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}, [])
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const onStopResizing = useCallback(() => {
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if (lastYPosition.current !== undefined) {
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lastYPosition.current = undefined
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}
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}, [])
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useEffect(() => {
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const moveHandler = onMove
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const stopResizeHandler = onStopResizing
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window.addEventListener('touchmove', moveHandler)
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window.addEventListener('mousemove', moveHandler)
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window.addEventListener('touchcancel', stopResizeHandler)
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window.addEventListener('touchend', stopResizeHandler)
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window.addEventListener('mouseup', stopResizeHandler)
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return () => {
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window.removeEventListener('touchmove', moveHandler)
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window.removeEventListener('mousemove', moveHandler)
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window.removeEventListener('touchcancel', stopResizeHandler)
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window.removeEventListener('touchend', stopResizeHandler)
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window.removeEventListener('mouseup', stopResizeHandler)
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}
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}, [onMove, onStopResizing])
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return [frameHeight, onStartResizing]
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}
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