kopia lustrzana https://github.com/shoelace-style/shoelace
138 wiersze
4.5 KiB
TypeScript
138 wiersze
4.5 KiB
TypeScript
import '../icon/icon';
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import { classMap } from 'lit/directives/class-map.js';
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import { customElement, property, query } from 'lit/decorators.js';
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import { getTextContent } from '../../internal/slot';
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import { html } from 'lit';
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import { watch } from '../../internal/watch';
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import ShoelaceElement from '../../internal/shoelace-element';
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import styles from './menu-item.styles';
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import type { CSSResultGroup } from 'lit';
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/**
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* @summary Menu items provide options for the user to pick from in a menu.
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* @documentation https://shoelace.style/components/menu-item
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* @status stable
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* @since 2.0
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*
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* @dependency sl-icon
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*
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* @slot - The menu item's label.
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* @slot prefix - Used to prepend an icon or similar element to the menu item.
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* @slot suffix - Used to append an icon or similar element to the menu item.
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*
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* @csspart base - The component's base wrapper.
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* @csspart checked-icon - The checked icon, which is only visible when the menu item is checked.
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* @csspart prefix - The prefix container.
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* @csspart label - The menu item label.
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* @csspart suffix - The suffix container.
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*/
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@customElement('sl-menu-item')
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export default class SlMenuItem extends ShoelaceElement {
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static styles: CSSResultGroup = styles;
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private cachedTextLabel: string;
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@query('slot:not([name])') defaultSlot: HTMLSlotElement;
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@query('.menu-item') menuItem: HTMLElement;
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/** The type of menu item to render. To use `checked`, this value must be set to `checkbox`. */
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@property() type: 'normal' | 'checkbox' = 'normal';
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/** Draws the item in a checked state. */
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@property({ type: Boolean, reflect: true }) checked = false;
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/** A unique value to store in the menu item. This can be used as a way to identify menu items when selected. */
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@property() value = '';
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/** Draws the menu item in a disabled state, preventing selection. */
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@property({ type: Boolean, reflect: true }) disabled = false;
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private handleDefaultSlotChange() {
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const textLabel = this.getTextLabel();
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// Ignore the first time the label is set
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if (typeof this.cachedTextLabel === 'undefined') {
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this.cachedTextLabel = textLabel;
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return;
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}
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// When the label changes, emit a slotchange event so parent controls see it
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if (textLabel !== this.cachedTextLabel) {
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this.cachedTextLabel = textLabel;
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this.emit('slotchange', { bubbles: true, composed: false, cancelable: false });
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}
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}
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@watch('checked')
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handleCheckedChange() {
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// For proper accessibility, users have to use type="checkbox" to use the checked attribute
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if (this.checked && this.type !== 'checkbox') {
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this.checked = false;
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console.error('The checked attribute can only be used on menu items with type="checkbox"', this);
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return;
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}
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// Only checkbox types can receive the aria-checked attribute
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if (this.type === 'checkbox') {
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this.setAttribute('aria-checked', this.checked ? 'true' : 'false');
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} else {
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this.removeAttribute('aria-checked');
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}
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}
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@watch('disabled')
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handleDisabledChange() {
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this.setAttribute('aria-disabled', this.disabled ? 'true' : 'false');
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}
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@watch('type')
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handleTypeChange() {
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if (this.type === 'checkbox') {
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this.setAttribute('role', 'menuitemcheckbox');
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this.setAttribute('aria-checked', this.checked ? 'true' : 'false');
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} else {
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this.setAttribute('role', 'menuitem');
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this.removeAttribute('aria-checked');
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}
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}
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/** Returns a text label based on the contents of the menu item's default slot. */
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getTextLabel() {
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return getTextContent(this.defaultSlot);
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}
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render() {
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return html`
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<div
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part="base"
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class=${classMap({
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'menu-item': true,
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'menu-item--checked': this.checked,
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'menu-item--disabled': this.disabled,
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'menu-item--has-submenu': false // reserved for future use
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})}
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>
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<span part="checked-icon" class="menu-item__check">
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<sl-icon name="check" library="system" aria-hidden="true"></sl-icon>
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</span>
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<slot name="prefix" part="prefix" class="menu-item__prefix"></slot>
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<slot part="label" class="menu-item__label" @slotchange=${this.handleDefaultSlotChange}></slot>
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<slot name="suffix" part="suffix" class="menu-item__suffix"></slot>
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<span class="menu-item__chevron">
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<sl-icon name="chevron-right" library="system" aria-hidden="true"></sl-icon>
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</span>
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</div>
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`;
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}
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}
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declare global {
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interface HTMLElementTagNameMap {
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'sl-menu-item': SlMenuItem;
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}
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}
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