kopia lustrzana https://github.com/shoelace-style/shoelace
484 wiersze
15 KiB
TypeScript
484 wiersze
15 KiB
TypeScript
import { autoUpdate, computePosition, flip, offset, shift, size } from '@floating-ui/dom';
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import { html, LitElement } from 'lit';
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import { customElement, property, query } from 'lit/decorators.js';
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import { classMap } from 'lit/directives/class-map.js';
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import type SlButton from '~/components/button/button';
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import type SlIconButton from '~/components/icon-button/icon-button';
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import type SlMenuItem from '~/components/menu-item/menu-item';
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import type SlMenu from '~/components/menu/menu';
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import { animateTo, stopAnimations } from '~/internal/animate';
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import { emit, waitForEvent } from '~/internal/event';
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import { scrollIntoView } from '~/internal/scroll';
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import { getTabbableBoundary } from '~/internal/tabbable';
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import { watch } from '~/internal/watch';
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import { getAnimation, setDefaultAnimation } from '~/utilities/animation-registry';
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import styles from './dropdown.styles';
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/**
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* @since 2.0
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* @status stable
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*
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* @slot - The dropdown's content.
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* @slot trigger - The dropdown's trigger, usually a `<sl-button>` element.
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*
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* @event sl-show - Emitted when the dropdown opens.
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* @event sl-after-show - Emitted after the dropdown opens and all animations are complete.
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* @event sl-hide - Emitted when the dropdown closes.
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* @event sl-after-hide - Emitted after the dropdown closes and all animations are complete.
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*
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* @csspart base - The component's internal wrapper.
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* @csspart trigger - The container that wraps the trigger.
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* @csspart panel - The panel that gets shown when the dropdown is open.
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*
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* @animation dropdown.show - The animation to use when showing the dropdown.
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* @animation dropdown.hide - The animation to use when hiding the dropdown.
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*/
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@customElement('sl-dropdown')
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export default class SlDropdown extends LitElement {
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static styles = styles;
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@query('.dropdown__trigger') trigger: HTMLElement;
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@query('.dropdown__panel') panel: HTMLElement;
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@query('.dropdown__positioner') positioner: HTMLElement;
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private positionerCleanup: ReturnType<typeof autoUpdate> | undefined;
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/** Indicates whether or not the dropdown is open. You can use this in lieu of the show/hide methods. */
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@property({ type: Boolean, reflect: true }) open = false;
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/**
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* The preferred placement of the dropdown panel. Note that the actual placement may vary as needed to keep the panel
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* inside of the viewport.
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*/
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@property({ reflect: true }) placement:
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| 'top'
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| 'top-start'
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| 'top-end'
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| 'bottom'
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| 'bottom-start'
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| 'bottom-end'
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| 'right'
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| 'right-start'
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| 'right-end'
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| 'left'
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| 'left-start'
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| 'left-end' = 'bottom-start';
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/** Disables the dropdown so the panel will not open. */
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@property({ type: Boolean }) disabled = false;
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/**
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* By default, the dropdown is closed when an item is selected. This attribute will keep it open instead. Useful for
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* controls that allow multiple selections.
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*/
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@property({ attribute: 'stay-open-on-select', type: Boolean, reflect: true }) stayOpenOnSelect = false;
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/** The dropdown will close when the user interacts outside of this element (e.g. clicking). */
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@property({ attribute: false }) containingElement?: HTMLElement;
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/** The distance in pixels from which to offset the panel away from its trigger. */
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@property({ type: Number }) distance = 0;
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/** The distance in pixels from which to offset the panel along its trigger. */
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@property({ type: Number }) skidding = 0;
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/**
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* Enable this option to prevent the panel from being clipped when the component is placed inside a container with
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* `overflow: auto|scroll`.
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*/
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@property({ type: Boolean }) hoist = false;
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connectedCallback() {
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super.connectedCallback();
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this.handleMenuItemActivate = this.handleMenuItemActivate.bind(this);
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this.handlePanelSelect = this.handlePanelSelect.bind(this);
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this.handleDocumentKeyDown = this.handleDocumentKeyDown.bind(this);
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this.handleDocumentMouseDown = this.handleDocumentMouseDown.bind(this);
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if (!this.containingElement) {
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this.containingElement = this;
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}
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}
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async firstUpdated() {
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this.panel.hidden = !this.open;
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// If the dropdown is visible on init, update its position
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if (this.open) {
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await this.updateComplete;
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this.startPositioner();
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}
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}
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disconnectedCallback() {
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super.disconnectedCallback();
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this.hide();
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this.stopPositioner();
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}
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focusOnTrigger() {
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const slot = this.trigger.querySelector('slot')!;
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const trigger = slot.assignedElements({ flatten: true })[0] as HTMLElement | undefined;
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if (typeof trigger?.focus === 'function') {
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trigger.focus();
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}
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}
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getMenu() {
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const slot = this.panel.querySelector('slot')!;
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return slot.assignedElements({ flatten: true }).find(el => el.tagName.toLowerCase() === 'sl-menu') as
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| SlMenu
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| undefined;
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}
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handleDocumentKeyDown(event: KeyboardEvent) {
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// Close when escape is pressed
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if (event.key === 'Escape') {
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this.hide();
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this.focusOnTrigger();
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return;
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}
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// Handle tabbing
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if (event.key === 'Tab') {
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// Tabbing within an open menu should close the dropdown and refocus the trigger
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if (this.open && document.activeElement?.tagName.toLowerCase() === 'sl-menu-item') {
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event.preventDefault();
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this.hide();
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this.focusOnTrigger();
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return;
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}
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// Tabbing outside of the containing element closes the panel
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//
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// If the dropdown is used within a shadow DOM, we need to obtain the activeElement within that shadowRoot,
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// otherwise `document.activeElement` will only return the name of the parent shadow DOM element.
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setTimeout(() => {
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const activeElement =
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this.containingElement?.getRootNode() instanceof ShadowRoot
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? document.activeElement?.shadowRoot?.activeElement
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: document.activeElement;
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if (
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!this.containingElement ||
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activeElement?.closest(this.containingElement.tagName.toLowerCase()) !== this.containingElement
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) {
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this.hide();
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}
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});
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}
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}
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handleDocumentMouseDown(event: MouseEvent) {
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// Close when clicking outside of the containing element
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const path = event.composedPath();
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if (this.containingElement && !path.includes(this.containingElement)) {
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this.hide();
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}
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}
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handleMenuItemActivate(event: CustomEvent) {
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const item = event.target as SlMenuItem;
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scrollIntoView(item, this.panel);
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}
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handlePanelSelect(event: CustomEvent) {
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const target = event.target as HTMLElement;
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// Hide the dropdown when a menu item is selected
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if (!this.stayOpenOnSelect && target.tagName.toLowerCase() === 'sl-menu') {
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this.hide();
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this.focusOnTrigger();
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}
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}
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@watch('distance')
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@watch('hoist')
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@watch('placement')
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@watch('skidding')
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handlePopoverOptionsChange() {
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this.updatePositioner();
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}
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handleTriggerClick() {
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if (this.open) {
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this.hide();
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} else {
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this.show();
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}
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}
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handleTriggerKeyDown(event: KeyboardEvent) {
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const menu = this.getMenu()!;
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const menuItems = menu.defaultSlot.assignedElements({ flatten: true }) as SlMenuItem[];
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const firstMenuItem = menuItems[0];
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const lastMenuItem = menuItems[menuItems.length - 1];
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// Close when escape or tab is pressed
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if (event.key === 'Escape') {
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this.focusOnTrigger();
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this.hide();
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return;
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}
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// When spacebar/enter is pressed, show the panel but don't focus on the menu. This let's the user press the same
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// key again to hide the menu in case they don't want to make a selection.
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if ([' ', 'Enter'].includes(event.key)) {
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event.preventDefault();
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this.handleTriggerClick();
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return;
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}
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// When up/down is pressed, we make the assumption that the user is familiar with the menu and plans to make a
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// selection. Rather than toggle the panel, we focus on the menu (if one exists) and activate the first item for
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// faster navigation.
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if (['ArrowDown', 'ArrowUp', 'Home', 'End'].includes(event.key)) {
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event.preventDefault();
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// Show the menu if it's not already open
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if (!this.open) {
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this.show();
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}
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// Focus on the first/last menu item after showing
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requestAnimationFrame(() => {
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if (event.key === 'ArrowDown' || event.key === 'Home') {
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menu.setCurrentItem(firstMenuItem);
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firstMenuItem.focus();
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}
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if (event.key === 'ArrowUp' || event.key === 'End') {
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menu.setCurrentItem(lastMenuItem);
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lastMenuItem.focus();
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}
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});
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}
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// Other keys bring focus to the menu and initiate type-to-select behavior
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const ignoredKeys = ['Tab', 'Shift', 'Meta', 'Ctrl', 'Alt'];
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if (this.open && !ignoredKeys.includes(event.key)) {
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menu.typeToSelect(event);
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}
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}
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handleTriggerKeyUp(event: KeyboardEvent) {
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// Prevent space from triggering a click event in Firefox
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if (event.key === ' ') {
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event.preventDefault();
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}
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}
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handleTriggerSlotChange() {
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this.updateAccessibleTrigger();
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}
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//
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// Slotted triggers can be arbitrary content, but we need to link them to the dropdown panel with `aria-haspopup` and
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// `aria-expanded`. These must be applied to the "accessible trigger" (the tabbable portion of the trigger element
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// that gets slotted in) so screen readers will understand them. The accessible trigger could be the slotted element,
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// a child of the slotted element, or an element in the slotted element's shadow root.
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//
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// For example, the accessible trigger of an <sl-button> is a <button> located inside its shadow root.
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//
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// To determine this, we assume the first tabbable element in the trigger slot is the "accessible trigger."
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//
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updateAccessibleTrigger() {
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const slot = this.trigger.querySelector('slot')!;
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const assignedElements = slot.assignedElements({ flatten: true }) as HTMLElement[];
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const accessibleTrigger = assignedElements.find(el => getTabbableBoundary(el).start);
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let target: HTMLElement;
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if (accessibleTrigger) {
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switch (accessibleTrigger.tagName.toLowerCase()) {
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// Shoelace buttons have to update the internal button so it's announced correctly by screen readers
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case 'sl-button':
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case 'sl-icon-button':
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target = (accessibleTrigger as SlButton | SlIconButton).button;
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break;
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default:
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target = accessibleTrigger;
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}
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target.setAttribute('aria-haspopup', 'true');
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target.setAttribute('aria-expanded', this.open ? 'true' : 'false');
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}
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}
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/** Shows the dropdown panel. */
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async show() {
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if (this.open) {
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return undefined;
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}
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this.open = true;
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return waitForEvent(this, 'sl-after-show');
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}
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/** Hides the dropdown panel */
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async hide() {
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if (!this.open) {
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return undefined;
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}
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this.open = false;
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return waitForEvent(this, 'sl-after-hide');
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}
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/**
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* Instructs the dropdown menu to reposition. Useful when the position or size of the trigger changes when the menu
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* is activated.
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*/
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reposition() {
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this.updatePositioner();
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}
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@watch('open', { waitUntilFirstUpdate: true })
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async handleOpenChange() {
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if (this.disabled) {
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this.open = false;
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return;
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}
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this.updateAccessibleTrigger();
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if (this.open) {
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// Show
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emit(this, 'sl-show');
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this.panel.addEventListener('sl-activate', this.handleMenuItemActivate);
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this.panel.addEventListener('sl-select', this.handlePanelSelect);
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document.addEventListener('keydown', this.handleDocumentKeyDown);
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document.addEventListener('mousedown', this.handleDocumentMouseDown);
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await stopAnimations(this);
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this.startPositioner();
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this.panel.hidden = false;
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const { keyframes, options } = getAnimation(this, 'dropdown.show');
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await animateTo(this.panel, keyframes, options);
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emit(this, 'sl-after-show');
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} else {
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// Hide
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emit(this, 'sl-hide');
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this.panel.removeEventListener('sl-activate', this.handleMenuItemActivate);
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this.panel.removeEventListener('sl-select', this.handlePanelSelect);
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document.removeEventListener('keydown', this.handleDocumentKeyDown);
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document.removeEventListener('mousedown', this.handleDocumentMouseDown);
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await stopAnimations(this);
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const { keyframes, options } = getAnimation(this, 'dropdown.hide');
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await animateTo(this.panel, keyframes, options);
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this.panel.hidden = true;
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this.stopPositioner();
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emit(this, 'sl-after-hide');
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}
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}
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private startPositioner() {
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this.stopPositioner();
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this.updatePositioner();
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this.positionerCleanup = autoUpdate(this.trigger, this.positioner, this.updatePositioner.bind(this));
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}
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private updatePositioner() {
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if (!this.open || !this.trigger || !this.positioner) {
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return;
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}
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computePosition(this.trigger, this.positioner, {
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placement: this.placement,
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middleware: [
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offset({ mainAxis: this.distance, crossAxis: this.skidding }),
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flip(),
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shift(),
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size({
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apply: ({ width, height }) => {
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// Ensure the panel stays within the viewport when we have lots of menu items
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Object.assign(this.panel.style, {
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maxWidth: `${width}px`,
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maxHeight: `${height}px`
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});
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},
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padding: 8
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})
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],
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strategy: this.hoist ? 'fixed' : 'absolute'
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}).then(({ x, y, placement }) => {
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this.positioner.setAttribute('data-placement', placement);
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Object.assign(this.positioner.style, {
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position: this.hoist ? 'fixed' : 'absolute',
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left: `${x}px`,
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top: `${y}px`
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});
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});
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}
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private stopPositioner() {
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if (this.positionerCleanup) {
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this.positionerCleanup();
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this.positionerCleanup = undefined;
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this.positioner.removeAttribute('data-placement');
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}
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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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id="dropdown"
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class=${classMap({
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dropdown: true,
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'dropdown--open': this.open
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})}
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>
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<span
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part="trigger"
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class="dropdown__trigger"
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@click=${this.handleTriggerClick}
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@keydown=${this.handleTriggerKeyDown}
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@keyup=${this.handleTriggerKeyUp}
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>
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<slot name="trigger" @slotchange=${this.handleTriggerSlotChange}></slot>
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</span>
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<!-- Position the panel with a wrapper since the popover makes use of translate. This let's us add animations
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on the panel without interfering with the position. -->
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<div class="dropdown__positioner">
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<div
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part="panel"
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class="dropdown__panel"
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aria-hidden=${this.open ? 'false' : 'true'}
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aria-labelledby="dropdown"
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>
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<slot></slot>
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</div>
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</div>
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</div>
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`;
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}
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}
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setDefaultAnimation('dropdown.show', {
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keyframes: [
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{ opacity: 0, transform: 'scale(0.9)' },
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{ opacity: 1, transform: 'scale(1)' }
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],
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options: { duration: 100, easing: 'ease' }
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});
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setDefaultAnimation('dropdown.hide', {
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keyframes: [
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{ opacity: 1, transform: 'scale(1)' },
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{ opacity: 0, transform: 'scale(0.9)' }
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],
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options: { duration: 100, easing: 'ease' }
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});
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declare global {
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interface HTMLElementTagNameMap {
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'sl-dropdown': SlDropdown;
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}
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}
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