zulip-desktop/app/renderer/js/components/functional-tab.ts

import {htmlEscape} from 'escape-goat';

import Tab, {TabProps} from './tab';

export default class FunctionalTab extends Tab {
	$closeButton: Element;

	constructor(props: TabProps) {
		super(props);
		this.init();
	}

	templateHTML(): string {
		return htmlEscape`
			<div class="tab functional-tab" data-tab-id="${this.props.tabIndex}">
				<div class="server-tab-badge close-button">
					<i class="material-icons">close</i>
				</div>
				<div class="server-tab">
					<i class="material-icons">${this.props.materialIcon}</i>
				</div>
			</div>
		`;
	}

	init(): void {
		this.$el = this.generateNodeFromHTML(this.templateHTML());
		if (this.props.name !== 'Settings') {
			this.props.$root.append(this.$el);
			this.$closeButton = this.$el.querySelectorAll('.server-tab-badge')[0];
			this.registerListeners();
		}
	}

	registerListeners(): void {
		super.registerListeners();

		this.$el.addEventListener('mouseover', () => {
			this.$closeButton.classList.add('active');
		});

		this.$el.addEventListener('mouseout', () => {
			this.$closeButton.classList.remove('active');
		});

		this.$closeButton.addEventListener('click', (event: Event) => {
			this.props.onDestroy();
			event.stopPropagation();
		});
	}
}