forked from OpenNeo/impress
93 lines
3 KiB
JavaScript
93 lines
3 KiB
JavaScript
class OutfitLayer extends HTMLElement {
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#internals;
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constructor() {
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super();
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this.#internals = this.attachInternals();
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// An <outfit-layer> starts in the loading state, and then might very
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// quickly decide it's not after `#connectToChildren`. This is to prevent a
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// flash of *non*-loading state, when a new layer loads in. (e.g. In the
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// time between our parent <turbo-frame> loading, which shows the loading
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// spinner; and us being marked `:state(loading)`, which shows the loading
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// spinner; we don't want the loading spinner to do its usual *immediate*
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// total fade-out; then have to fade back in again, on the usual delay.)
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this.#setStatus("loading");
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}
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connectedCallback() {
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setTimeout(() => this.#connectToChildren(), 0);
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}
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disconnectedCallback() {
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window.removeEventListener("message", this.#onMessage);
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}
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#connectToChildren() {
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const image = this.querySelector("img");
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const iframe = this.querySelector("iframe");
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if (image) {
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image.addEventListener("load", () => this.#setStatus("loaded"));
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image.addEventListener("error", () => this.#setStatus("error"));
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this.#setStatus(image.complete ? "loaded" : "loading");
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} else if (iframe) {
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this.iframe = iframe;
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window.addEventListener("message", (m) => this.#onMessage(m));
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this.#setStatus("loading");
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} else {
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throw new Error(`<outfit-layer> must contain an <img> or <iframe> tag`);
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}
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}
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#onMessage({ source, data }) {
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if (source !== this.iframe.contentWindow) {
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return;
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}
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if (data.type === "status" && ["loaded", "error"].includes(data.status)) {
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this.#setStatus(data.status);
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} else {
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throw new Error(
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`<outfit-layer> got unexpected message: ${JSON.stringify(data)}`,
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);
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}
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}
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#setStatus(newStatus) {
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this.#internals.states.clear();
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this.#internals.states.add(newStatus);
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}
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}
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customElements.define("outfit-layer", OutfitLayer);
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// Morph turbo-frames on this page, to reuse asset nodes when we want to—very
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// important for movies!—but ensure that it *doesn't* do its usual behavior of
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// aggressively reusing existing <outfit-layer> nodes for entirely different
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// assets. (It's a lot clearer for managing the loading state, and not showing
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// old incorrect layers!) (We also tried using `id` to enforce this… no luck.)
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addEventListener("turbo:before-frame-render", (event) => {
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if (typeof Idiomorph !== "undefined") {
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event.detail.render = (currentElement, newElement) => {
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Idiomorph.morph(currentElement, newElement.innerHTML, {
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morphStyle: "innerHTML",
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callbacks: {
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beforeNodeMorphed: (currentNode, newNode) => {
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// If Idiomorph wants to transform an <outfit-layer> to
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// have a different data-asset-id attribute, we replace
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// the node ourselves and abort the morph.
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if (
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newNode.tagName === "OUTFIT-LAYER" &&
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newNode.getAttribute("data-asset-id") !==
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currentNode.getAttribute("data-asset-id")
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) {
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currentNode.replaceWith(newNode);
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return false;
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}
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},
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},
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});
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};
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}
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});
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