@riovir/wc-fontawesome/src/font-awesome-layers-text.js

Web components for Font Awesome

import { applyStyleWith } from './apply-style-with.js';
import { parseTransform, textToHtml } from './svg-core.js';
import { definePropsOn, BooleanProp, StringProp } from './core.js';
import { updateElementClass } from './utils.js';
import { Props as IconProps } from './font-awesome-icon.js';

const applyStyle = applyStyleWith({ css: /* css */`
:host {
	box-sizing: border-box;
	display: inline-block;
	line-height: 1; }

.fa-layers-counter {
	background: var(--fa-layers-counter-background, #ff253a); }
` });

export const template = document.createElement('template');
template.innerHTML = /* html */`
<span class="fa-layers-text"></span>
`;

function toHtmlFallback(text = '') {
	const span = document.createElement('span');
	span.className = 'fa-layers-text';
	span.textContent = text;
	return [span.outerHTML];
}

const Internal = {
	CONTAINER: Symbol('container'),
	NEEDS_REDRAW: Symbol('needs-complete-redraw-of-structure'),
};

const updateContainerClass = updateElementClass(Internal.CONTAINER);
const prefixContainerClass = prefix => updateContainerClass(value => prefix.concat(value));

export const Props = {
	value: StringProp({ attribute: 'value', observe: updateContainer }),
	transform: { ...IconProps.transform, observe: updateContainer },
	parsedTransform: IconProps.parsedTransform,

	size: StringProp({ attribute: 'size', observe: prefixContainerClass('fa-') }),
	position: StringProp({ attribute: 'position', observe: prefixContainerClass('fa-layers-') }),

	fixedWidth: BooleanProp({ attribute: 'fixed-width', observe: updateContainerClass('fa-fw') }),
	inverse: BooleanProp({ attribute: 'inverse', observe: updateContainerClass('fa-inverse') }),
	counter: BooleanProp({ attribute: 'counter', observe: updateContainer }),
};

export class FontAwesomeLayersText extends HTMLElement {
	constructor() {
		super();
		const shadowRoot = this.attachShadow({ mode: 'open' });
		shadowRoot.appendChild(template.content.cloneNode(true));
		applyStyle(this);
		this[Internal.CONTAINER] = shadowRoot.querySelector('.fa-layers-text');
		this[Internal.NEEDS_REDRAW] = host => host.transform;
		this._toHtml = textToHtml;
		this._parseTransform = parseTransform;
	}
}
definePropsOn(FontAwesomeLayersText, Props);

function updateContainer(host) {
	if (host[Internal.NEEDS_REDRAW](host)) {
		redrawElements(host);
	}
	updateLayerClass(host);
	updateTextValue(host);
}

function redrawElements(host) {
	const classes = host[Internal.CONTAINER].classList;
	host[Internal.CONTAINER].remove();

	const options = {
		transform: host.parsedTransform,
	};
	const [container] = host._toHtml(String(host.value), options) || toHtmlFallback(host.value, options);
	host.shadowRoot.innerHTML = host.shadowRoot.innerHTML.concat(container);
	host[Internal.CONTAINER] = host.shadowRoot.querySelector('.fa-layers-text');
	host[Internal.CONTAINER].classList.add(...classes);

	const { transform } = host;
	host[Internal.NEEDS_REDRAW] = host => transform !== host.transform;
}

function updateLayerClass(host) {
	const classList = host[Internal.CONTAINER].classList;
	const layerClass = host.counter ? 'fa-layers-counter' : 'fa-layers-text';
	if (classList.contains(layerClass)) { return; }
	host[Internal.CONTAINER].classList.remove('fa-layers-counter', 'fa-layers-text');
	host[Internal.CONTAINER].classList.add(layerClass);
}

function updateTextValue(host, value = host.value) {
	const text = host.counter && !value ? 0 : value;
	host[Internal.CONTAINER].textContent = text;
}