// 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 { sendSticker } from "./widget-api.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` class App extends Component { constructor(props) { super(props) this.state = { packs: [], loading: true, error: null, } this.imageObserver = null this.packListRef = null } 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}/${packFile}`) const packData = await packRes.json() this.setState({ packs: [...this.state.packs, packData], loading: false, }) } }, error => this.setState({ loading: false, error })) this.imageObserver = new IntersectionObserver(this.observeImageIntersections, { rootMargin: "100px", }) this.sectionObserver = new IntersectionObserver(this.observeSectionIntersections) } observeImageIntersections(intersections) { for (const entry of intersections) { const img = entry.target.children.item(0) if (entry.isIntersecting) { img.setAttribute("src", img.getAttribute("data-src")) img.classList.add("visible") } else { img.removeAttribute("src") img.classList.remove("visible") } } } observeSectionIntersections(intersections) { for (const entry of intersections) { const packID = entry.target.getAttribute("data-pack-id") const navElement = document.getElementById(`nav-${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() } 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> ${this.state.packs.map(pack => html`<${NavBarItem} id=${pack.id} pack=${pack}/>`)} </nav> <div class="pack-list" ref=${elem => this.packListRef = elem}> ${this.state.packs.map(pack => html`<${Pack} id=${pack.id} pack=${pack}/>`)} </div> </main>` } } const NavBarItem = ({ pack }) => html` <a href="#pack-${pack.id}" id="nav-${pack.id}" data-pack-id=${pack.id} title=${pack.title}> <div class="sticker"> <img src=${makeThumbnailURL(pack.stickers[0].url)} alt=${pack.stickers[0].body} class="visible" /> </div> </a> ` const Pack = ({ pack }) => 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=${sticker["net.maunium.telegram.sticker"].id} content=${sticker}/> `)} </div> </section> ` const Sticker = ({ content }) => html` <div class="sticker" onClick=${() => sendSticker(content)}> <img data-src=${makeThumbnailURL(content.url)} alt=${content.body} /> </div> ` render(html`<${App} />`, document.body)