Source code

Revision control

Copy as Markdown

Other Tools

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at htp://mozilla.org/MPL/2.0/. */
import { html, ifDefined } from "../vendor/lit.all.mjs";
import { MozLitElement } from "../lit-utils.mjs";
// eslint-disable-next-line import/no-unassigned-import
import "chrome://global/content/elements/moz-label.mjs";
/**
* A simple toggle element that can be used to switch between two states.
*
* @tagname moz-toggle
* @property {boolean} pressed - Whether or not the element is pressed.
* @property {boolean} disabled - Whether or not the element is disabled.
* @property {string} label - The label text.
* @property {string} description - The description text.
* @property {string} ariaLabel
* The aria-label text for cases where there is no visible label.
* @slot support-link - Used to append a moz-support-link to the description.
* @fires toggle
* Custom event indicating that the toggle's pressed state has changed.
*/
export default class MozToggle extends MozLitElement {
static properties = {
pressed: { type: Boolean, reflect: true },
disabled: { type: Boolean, reflect: true },
label: { type: String },
description: { type: String },
ariaLabel: { type: String, attribute: "aria-label" },
accessKeyAttribute: { type: String, attribute: "accesskey", reflect: true },
accessKey: { type: String, state: true },
};
static get queries() {
return {
buttonEl: "#moz-toggle-button",
labelEl: "#moz-toggle-label",
descriptionEl: "#moz-toggle-description",
};
}
constructor() {
super();
this.pressed = false;
this.disabled = false;
}
handleClick() {
this.pressed = !this.pressed;
this.dispatchOnUpdateComplete(
new CustomEvent("toggle", {
bubbles: true,
composed: true,
})
);
}
// Delegate clicks on the host to the input element
click() {
this.buttonEl.click();
}
// Delegate focus to the input element
focus() {
this.buttonEl.focus();
}
willUpdate(changes) {
if (changes.has("accessKeyAttribute")) {
this.accessKey = this.accessKeyAttribute;
this.accessKeyAttribute = null;
}
}
descriptionTemplate() {
if (this.description) {
return html`
<p
id="moz-toggle-description"
class="description-wrapper text-deemphasized"
part="description"
>
${this.description} ${this.supportLinkTemplate()}
</p>
`;
}
return "";
}
supportLinkTemplate() {
return html` <slot name="support-link"></slot> `;
}
buttonTemplate() {
const { pressed, disabled, description, ariaLabel, handleClick } = this;
return html`
<button
id="moz-toggle-button"
part="button"
type="button"
class="toggle-button"
?disabled=${disabled}
aria-pressed=${pressed}
aria-label=${ifDefined(ariaLabel ?? undefined)}
aria-describedby=${ifDefined(
description ? "moz-toggle-description" : undefined
)}
accesskey=${ifDefined(this.accessKey)}
@click=${handleClick}
></button>
`;
}
render() {
return html`
<link
rel="stylesheet"
href="chrome://global/content/elements/moz-toggle.css"
/>
${this.label
? html`
<label
is="moz-label"
id="moz-toggle-label"
part="label"
for="moz-toggle-button"
shownaccesskey=${ifDefined(this.accessKey)}
>
<span>
${this.label}
${!this.description ? this.supportLinkTemplate() : ""}
</span>
${this.buttonTemplate()}
</label>
`
: this.buttonTemplate()}
${this.descriptionTemplate()}
`;
}
}
customElements.define("moz-toggle", MozToggle);