add qr context menus

public/scripts/extensions/quick-reply/src/ContextMenu.js

@@ -0,0 +1,46 @@
+import { MenuItem } from "./MenuItem.js";
+
+export class ContextMenu {
+	/**@type {HTMLElement}*/ root;
+	/**@type {HTMLElement}*/ menu;
+
+	/**@type {MenuItem[]}*/ itemList = [];
+
+
+
+
+	constructor(/**@type {MenuItem[]}*/items) {
+		this.itemList = items;
+	}
+
+	render() {
+		if (!this.root) {
+			const blocker = document.createElement('div'); {
+				this.root = blocker;
+				blocker.classList.add('ctx-blocker');
+				blocker.addEventListener('click', ()=>this.hide());
+				const menu = document.createElement('ul'); {
+					this.menu = menu;
+					menu.classList.add('list-group');
+					menu.classList.add('ctx-menu');
+					this.itemList.forEach(it=>menu.append(it.render()));
+					blocker.append(menu);
+				}
+			}
+		}
+		return this.root;
+	}
+
+
+
+
+	show({screenX, screenY}) {
+		this.render();
+		this.menu.style.bottom = `${window.innerHeight - screenY}px`;
+		this.menu.style.left = `${screenX}px`;
+		document.body.append(this.root);
+	}
+	hide() {
+		this.root.remove();
+	}
+}