179 lines
4.2 KiB
TypeScript
179 lines
4.2 KiB
TypeScript
import { useEffect, useRef } from "../deps.ts";
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import { Client } from "../client.ts";
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import { PanelConfig } from "../types.ts";
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export const panelHtml = `<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<base target="_top">
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<script>
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const pendingRequests = new Map();
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let syscallReqId = 0;
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self.syscall = async (name, ...args) => {
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return await new Promise((resolve, reject) => {
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syscallReqId++;
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pendingRequests.set(syscallReqId, { resolve, reject });
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window.parent.postMessage({
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type: "syscall",
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id: syscallReqId,
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name,
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args,
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}, "*");
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});
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};
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window.addEventListener("message", (message) => {
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const data = message.data;
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switch (data.type) {
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case "html":
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document.body.innerHTML = data.html;
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if (data.script) {
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try {
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eval(data.script);
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} catch (e) {
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console.error("Error evaling script", e);
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}
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}
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break;
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case "syscall-response":
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{
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const syscallId = data.id;
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const lookup = pendingRequests.get(syscallId);
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if (!lookup) {
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console.log(
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"Current outstanding requests",
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pendingRequests,
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"looking up",
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syscallId,
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);
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throw Error("Invalid request id");
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}
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pendingRequests.delete(syscallId);
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if (data.error) {
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lookup.reject(new Error(data.error));
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} else {
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lookup.resolve(data.result);
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}
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}
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break;
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}
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});
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// DEPRECATED: Use syscall("event.dispatch", ...) instead
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function sendEvent(name, ...args) {
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window.parent.postMessage({ type: "event", name, args, }, "*");
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}
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function api(obj) {
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window.parent.postMessage(obj, "*");
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}
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function updateHeight() {
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api({
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type: "setHeight",
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height: document.documentElement.offsetHeight,
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});
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}
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function loadJsByUrl(url) {
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const script = document.createElement("script");
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script.src = url;
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return new Promise((resolve) => {
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script.onload = resolve;
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document.documentElement.firstChild.appendChild(script);
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});
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}
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</script>
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</head>
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<body>
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Loading...
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</body>
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</html>`;
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export function Panel({
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config,
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editor,
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}: {
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config: PanelConfig;
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editor: Client;
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}) {
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const iFrameRef = useRef<HTMLIFrameElement>(null);
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useEffect(() => {
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function loadContent() {
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if (iFrameRef.current?.contentWindow) {
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iFrameRef.current.contentWindow.postMessage({
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type: "html",
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html: config.html,
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script: config.script,
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});
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}
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}
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if (!iFrameRef.current) {
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return;
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}
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const iframe = iFrameRef.current;
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iframe.onload = loadContent;
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loadContent();
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return () => {
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iframe.onload = null;
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};
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}, [config.html, config.script]);
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useEffect(() => {
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const messageListener = (evt: any) => {
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if (evt.source !== iFrameRef.current!.contentWindow) {
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return;
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}
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const data = evt.data;
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if (!data) {
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return;
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}
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switch (data.type) {
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case "event":
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editor.dispatchAppEvent(data.name, ...data.args);
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break;
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case "syscall": {
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const { id, name, args } = data;
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editor.system.localSyscall(name, args).then(
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(result) => {
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if (!iFrameRef.current?.contentWindow) {
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// iFrame already went away
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return;
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}
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iFrameRef.current!.contentWindow!.postMessage({
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type: "syscall-response",
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id,
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result,
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});
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},
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).catch((e: any) => {
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if (!iFrameRef.current?.contentWindow) {
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// iFrame already went away
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return;
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}
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iFrameRef.current!.contentWindow!.postMessage({
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type: "syscall-response",
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id,
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error: e.message,
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});
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});
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break;
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}
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}
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};
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globalThis.addEventListener("message", messageListener);
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return () => {
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globalThis.removeEventListener("message", messageListener);
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};
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}, []);
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return (
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<div className="sb-panel" style={{ flex: config.mode }}>
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<iframe srcDoc={panelHtml} ref={iFrameRef} />
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</div>
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);
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}
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