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// Copyright (c) 2020 Tulir Asokan
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
import { html, render, Component } from "https://unpkg.com/htm/preact/index.mjs?module" import { Spinner } from "./spinner.js" import * as widgetAPI from "./widget-api.js" import * as frequent from "./frequently-used.js"
// The base URL for fetching packs. The app will first fetch ${PACK_BASE_URL}/index.json,
// then ${PACK_BASE_URL}/${packFile} for each packFile in the packs object of the index.json file.
const PACKS_BASE_URL = "packs" // This is updated from packs/index.json
let HOMESERVER_URL = "https://matrix-client.matrix.org"
const makeThumbnailURL = mxc => `${HOMESERVER_URL}/_matrix/media/r0/thumbnail/${mxc.substr(6)}?height=128&width=128&method=scale`
// We need to detect iOS webkit because it has a bug related to scrolling non-fixed divs
// This is also used to fix scrolling to sections on Element iOS
const isMobileSafari = navigator.userAgent.match(/(iPod|iPhone|iPad)/) && navigator.userAgent.match(/AppleWebKit/)
class App extends Component { constructor(props) { super(props) this.state = { packs: [], loading: true, error: null, frequentlyUsed: { id: "frequently-used", title: "Frequently used", stickerIDs: frequent.get(), stickers: [], }, } this.stickersByID = new Map(JSON.parse(localStorage.mauFrequentlyUsedStickerCache || "[]")) this.state.frequentlyUsed.stickers = this._getStickersByID(this.state.frequentlyUsed.stickerIDs) this.imageObserver = null this.packListRef = null this.navRef = null this.sendSticker = this.sendSticker.bind(this) this.navScroll = this.navScroll.bind(this) }
_getStickersByID(ids) { return ids.map(id => this.stickersByID.get(id)).filter(sticker => !!sticker) }
updateFrequentlyUsed() { const stickerIDs = frequent.get() const stickers = this._getStickersByID(stickerIDs) this.setState({ frequentlyUsed: { ...this.state.frequentlyUsed, stickerIDs, stickers } }) localStorage.mauFrequentlyUsedStickerCache = JSON.stringify(stickers.map(sticker => [sticker.id, sticker])) }
componentDidMount() { fetch(`${PACKS_BASE_URL}/index.json`).then(async indexRes => { if (indexRes.status >= 400) { this.setState({ loading: false, error: indexRes.status !== 404 ? indexRes.statusText : null, }) return } const indexData = await indexRes.json() HOMESERVER_URL = indexData.homeserver_url || HOMESERVER_URL // TODO only load pack metadata when scrolled into view?
for (const packFile of indexData.packs) { const packRes = await fetch(`${PACKS_BASE_URL}/${packFile}`) const packData = await packRes.json() for (const sticker of packData.stickers) { this.stickersByID.set(sticker.id, sticker) } this.setState({ packs: [...this.state.packs, packData], loading: false, }) } this.updateFrequentlyUsed() }, error => this.setState({ loading: false, error }))
this.imageObserver = new IntersectionObserver(this.observeImageIntersections, { rootMargin: "100px", }) this.sectionObserver = new IntersectionObserver(this.observeSectionIntersections) }
observeImageIntersections(intersections) { for (const entry of intersections) { const img = entry.target.children.item(0) if (entry.isIntersecting) { img.setAttribute("src", img.getAttribute("data-src")) img.classList.add("visible") } else { img.removeAttribute("src") img.classList.remove("visible") } } }
observeSectionIntersections(intersections) { for (const entry of intersections) { const packID = entry.target.getAttribute("data-pack-id") const navElement = document.getElementById(`nav-${packID}`) if (entry.isIntersecting) { navElement.classList.add("visible") } else { navElement.classList.remove("visible") } } }
componentDidUpdate() { for (const elem of this.packListRef.getElementsByClassName("sticker")) { this.imageObserver.observe(elem) } for (const elem of this.packListRef.children) { this.sectionObserver.observe(elem) } }
componentWillUnmount() { this.imageObserver.disconnect() this.sectionObserver.disconnect() }
sendSticker(evt) { const id = evt.currentTarget.getAttribute("data-sticker-id") const sticker = this.stickersByID.get(id) frequent.add(id) this.updateFrequentlyUsed() widgetAPI.sendSticker(sticker) }
navScroll(evt) { this.navRef.scrollLeft += evt.deltaY * 12 }
render() { if (this.state.loading) { return html`<main class="spinner"><${Spinner} size=${80} green /></main>` } else if (this.state.error) { return html`<main class="error">
<h1>Failed to load packs</h1> <p>${this.state.error}</p> </main>` } else if (this.state.packs.length === 0) { return html`<main class="empty"><h1>No packs found 😿</h1></main>` } return html`<main class="has-content">
<nav onWheel=${this.navScroll} ref=${elem => this.navRef = elem}> <${NavBarItem} pack=${this.state.frequentlyUsed} iconOverride="res/recent.svg" altOverride="🕓️" /> ${this.state.packs.map(pack => html`<${NavBarItem} id=${pack.id} pack=${pack}/>`)} </nav> <div class="pack-list ${isMobileSafari ? "ios-safari-hack" : ""}" ref=${elem => this.packListRef = elem}> <${Pack} pack=${this.state.frequentlyUsed} send=${this.sendSticker} /> ${this.state.packs.map(pack => html`<${Pack} id=${pack.id} pack=${pack} send=${this.sendSticker} />`)} </div> </main>` } }
// By default we just let the browser handle scrolling to sections, but webviews on Element iOS
// open the link in the browser instead of just scrolling there, so we need to scroll manually:
const scrollToSection = (evt, id) => { const pack = document.getElementById(`pack-${id}`) pack.scrollIntoView({ block: "start", behavior: "instant" }) evt.preventDefault() }
const NavBarItem = ({ pack, iconOverride = null, altOverride = null }) => html`
<a href="#pack-${pack.id}" id="nav-${pack.id}" data-pack-id=${pack.id} title=${pack.title} onClick=${isMobileSafari ? (evt => scrollToSection(evt, pack.id)) : undefined}> <div class="sticker ${iconOverride ? "icon" : ""}"> ${iconOverride ? html`
<img src=${iconOverride} alt=${altOverride} class="visible"/> ` : html` <img src=${makeThumbnailURL(pack.stickers[0].url)} alt=${pack.stickers[0].body} class="visible" /> `}
</div> </a> `
const Pack = ({ pack, send }) => html`
<section class="stickerpack" id="pack-${pack.id}" data-pack-id=${pack.id}> <h1>${pack.title}</h1> <div class="sticker-list"> ${pack.stickers.map(sticker => html`
<${Sticker} key=${sticker.id} content=${sticker} send=${send}/> `)}
</div> </section> `
const Sticker = ({ content, send }) => html`
<div class="sticker" onClick=${send} data-sticker-id=${content.id}> <img data-src=${makeThumbnailURL(content.url)} alt=${content.body} /> </div> `
render(html`<${App} />`, document.body)
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