Add translation to the content script

src/content_script/content_script.ts

@@ -31,12 +31,18 @@ declare global {
 	});
 
 	const tippyInstance = tippy(document.body, {
-		content: "<lingo-loading></lingo-loading>",
 		allowHTML: true,
 		trigger: "manual",
 		interactive: true,
 		getReferenceClientRect: () =>
 			document.getSelection().getRangeAt(0).getBoundingClientRect(),
+		onShow: (instance) => {
+			instance.setContent(
+				`<lingo-translate toTranslate="${document
+					.getSelection()
+					.toString()}"></lingo-translate>`
+			);
+		},
 	});
 
 	let timeoutID: number;

src/content_script/custom_elements.ts

@@ -1,6 +1,39 @@
-import spinnerCSS from "./spinner.scss?file";
+import { browser } from "webextension-polyfill-ts";
+import contents from "./spinner.scss?raw";
 
-export class LingoLoading extends HTMLElement {
+class LingoTranslate extends HTMLElement {
+	shadow: ShadowRoot;
+
+	constructor() {
+		super();
+		this.shadow = this.attachShadow({ mode: "open" });
+		this.render();
+	}
+	render = () => {
+		this.shadow.innerHTML = "<lingo-loading></lingo-loading>";
+		const toTranslate = this.getAttribute("toTranslate");
+		const translation = browser.runtime.sendMessage({
+			commandKind: commands.translate,
+			toTranslate: toTranslate,
+		});
+		translation.then((t) => (this.shadow.textContent = t.result));
+	};
+
+	attributeChangedCallback = (
+		attributeName: string,
+		oldValue: string,
+		newValue: string
+	) => {
+		if (attributeName === "toTranslate" && oldValue != newValue) this.render();
+	};
+
+	static get observedAttributes() {
+		return ["toTranslate"];
+	}
+}
+customElements.define("lingo-translate", LingoTranslate);
+
+class LingoLoading extends HTMLElement {
 	constructor() {
 		super();
 		this.innerHTML = "";
@@ -8,10 +41,8 @@ export class LingoLoading extends HTMLElement {
 		let spinner = document.createElement("div");
 		spinner.id = "spinner";
 
-		const style = document.createElement("link");
-		style.rel = "stylesheet";
-		style.href = spinnerCSS;
-		style.textContent = spinnerCSS;
+		const style = document.createElement("style");
+		style.textContent = contents;
 		shadow.appendChild(style);
 		shadow.appendChild(spinner);
 	}