2021-03-24 14:21:21 +00:00
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import { LitElement, html, unsafeCSS } from 'lit';
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2021-05-27 21:00:43 +00:00
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import { customElement, property, query, state } from 'lit/decorators.js';
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2021-03-06 17:01:39 +00:00
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import { classMap } from 'lit-html/directives/class-map';
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2021-03-18 13:04:23 +00:00
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import { event, EventEmitter, watch } from '../../internal/decorators';
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2021-03-11 14:20:54 +00:00
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import { focusVisible } from '../../internal/focus-visible';
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2021-02-26 14:09:13 +00:00
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import { getOffset } from '../../internal/offset';
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import { scrollIntoView } from '../../internal/scroll';
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2021-05-27 20:29:10 +00:00
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import type SlTab from '../tab/tab';
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import type SlTabPanel from '../tab-panel/tab-panel';
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2021-05-03 19:08:17 +00:00
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import styles from 'sass:./tab-group.scss';
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2020-07-15 21:30:37 +00:00
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/**
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2020-07-17 10:09:10 +00:00
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* @since 2.0
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* @status stable
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*
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2021-02-26 14:09:13 +00:00
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* @dependency sl-icon-button
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*
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2020-07-15 21:30:37 +00:00
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* @slot nav - Used for grouping tabs in the tab group.
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* @slot - Used for grouping tab panels in the tab group.
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*
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* @part base - The component's base wrapper.
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* @part nav - The tab group navigation container.
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* @part tabs - The container that wraps the slotted tabs.
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* @part active-tab-indicator - An element that displays the currently selected tab. This is a child of the tabs container.
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* @part body - The tab group body where tab panels are slotted in.
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* @part scroll-button - The previous and next scroll buttons that appear when tabs are scrollable.
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2021-05-17 22:04:28 +00:00
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*
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* @customProperty --tabs-border-color - The color of the border that separates tabs.
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*/
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@customElement('sl-tab-group')
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export default class SlTabGroup extends LitElement {
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static styles = unsafeCSS(styles);
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@query('.tab-group') tabGroup: HTMLElement;
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@query('.tab-group__body') body: HTMLElement;
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@query('.tab-group__nav') nav: HTMLElement;
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@query('.tab-group__indicator') indicator: HTMLElement;
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2021-02-26 14:09:13 +00:00
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private activeTab: SlTab;
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private mutationObserver: MutationObserver;
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private resizeObserver: ResizeObserver;
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private tabs: SlTab[] = [];
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private panels: SlTabPanel[] = [];
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@state() private hasScrollControls = false;
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/** The placement of the tabs. */
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@property() placement: 'top' | 'bottom' | 'start' | 'end' = 'top';
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/**
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* When set to auto, navigating tabs with the arrow keys will instantly show the corresponding tab panel. When set to
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* manual, the tab will receive focus but will not show until the user presses spacebar or enter.
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*/
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@property() activation: 'auto' | 'manual' = 'auto';
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/** Disables the scroll arrows that appear when tabs overflow. */
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@property({ attribute: 'no-scroll-controls', type: Boolean }) noScrollControls = false;
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/** Emitted when a tab is shown. */
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@event('sl-tab-show') slTabShow: EventEmitter<{ tab: string }>;
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/** Emitted when a tab is hidden. */
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@event('sl-tab-hide') slTabHide: EventEmitter<{ tab: string }>;
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connectedCallback() {
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super.connectedCallback();
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this.resizeObserver = new ResizeObserver(() => {
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this.preventIndicatorTransition();
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this.repositionIndicator();
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this.updateScrollControls();
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});
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2020-07-30 21:27:43 +00:00
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this.mutationObserver = new MutationObserver(mutations => {
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// Update aria labels when the DOM changes
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if (mutations.some(m => !['aria-labelledby', 'aria-controls'].includes(m.attributeName as string))) {
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setTimeout(() => this.setAriaLabels());
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}
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// Sync tabs when disabled states change
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if (mutations.some(m => m.attributeName === 'disabled')) {
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this.syncTabsAndPanels();
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}
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});
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this.updateComplete.then(() => {
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this.syncTabsAndPanels();
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this.mutationObserver.observe(this, { attributes: true, childList: true, subtree: true });
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this.resizeObserver.observe(this.nav);
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focusVisible.observe(this.tabGroup);
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// Set initial tab state when the tabs first become visible
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const intersectionObserver = new IntersectionObserver((entries, observer) => {
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if (entries[0].intersectionRatio > 0) {
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this.setAriaLabels();
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this.setActiveTab(this.getActiveTab() || this.tabs[0], { emitEvents: false });
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observer.unobserve(entries[0].target);
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}
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});
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intersectionObserver.observe(this.tabGroup);
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});
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}
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disconnectedCallback() {
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this.mutationObserver.disconnect();
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this.resizeObserver.unobserve(this.nav);
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focusVisible.unobserve(this.tabGroup);
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}
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/** Shows the specified tab panel. */
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show(panel: string) {
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const tab = this.tabs.find(el => el.panel === panel) as SlTab;
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if (tab) {
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this.setActiveTab(tab, { scrollBehavior: 'smooth' });
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}
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}
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getAllTabs(includeDisabled = false) {
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const slot = this.shadowRoot!.querySelector('slot[name="nav"]') as HTMLSlotElement;
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return [...slot.assignedElements()].filter((el: any) => {
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return includeDisabled
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? el.tagName.toLowerCase() === 'sl-tab'
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: el.tagName.toLowerCase() === 'sl-tab' && !el.disabled;
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}) as SlTab[];
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}
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getAllPanels() {
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const slot = this.body.querySelector('slot')!;
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return [...slot.assignedElements()].filter((el: any) => el.tagName.toLowerCase() === 'sl-tab-panel') as [
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SlTabPanel
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];
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}
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getActiveTab() {
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return this.tabs.find(el => el.active);
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}
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handleClick(event: MouseEvent) {
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const target = event.target as HTMLElement;
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const tab = target.closest('sl-tab') as SlTab;
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const tabGroup = tab?.closest('sl-tab-group');
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// Ensure the target tab is in this tab group
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if (tabGroup !== this) {
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return;
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}
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if (tab) {
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this.setActiveTab(tab, { scrollBehavior: 'smooth' });
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}
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}
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handleKeyDown(event: KeyboardEvent) {
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const target = event.target as HTMLElement;
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const tab = target.closest('sl-tab') as SlTab;
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const tabGroup = tab?.closest('sl-tab-group');
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// Ensure the target tab is in this tab group
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if (tabGroup !== this) {
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return;
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}
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// Activate a tab
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if (['Enter', ' '].includes(event.key)) {
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if (tab) {
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this.setActiveTab(tab, { scrollBehavior: 'smooth' });
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event.preventDefault();
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}
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}
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// Move focus left or right
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if (['ArrowLeft', 'ArrowRight', 'ArrowUp', 'ArrowDown', 'Home', 'End'].includes(event.key)) {
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const activeEl = document.activeElement as any;
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if (activeEl && activeEl.tagName.toLowerCase() === 'sl-tab') {
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let index = this.tabs.indexOf(activeEl);
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if (event.key === 'Home') {
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index = 0;
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} else if (event.key === 'End') {
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index = this.tabs.length - 1;
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} else if (event.key === 'ArrowLeft') {
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index = Math.max(0, index - 1);
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} else if (event.key === 'ArrowRight') {
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index = Math.min(this.tabs.length - 1, index + 1);
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}
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this.tabs[index].focus({ preventScroll: true });
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if (this.activation === 'auto') {
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this.setActiveTab(this.tabs[index], { scrollBehavior: 'smooth' });
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}
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if (['top', 'bottom'].includes(this.placement)) {
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scrollIntoView(this.tabs[index], this.nav, 'horizontal');
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}
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event.preventDefault();
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}
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}
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}
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handleScrollToStart() {
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this.nav.scroll({
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left: this.nav.scrollLeft - this.nav.clientWidth,
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behavior: 'smooth'
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});
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}
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handleScrollToEnd() {
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this.nav.scroll({
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left: this.nav.scrollLeft + this.nav.clientWidth,
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behavior: 'smooth'
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});
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}
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@watch('noScrollControls')
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updateScrollControls() {
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if (this.nav) {
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if (this.noScrollControls) {
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this.hasScrollControls = false;
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} else {
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this.hasScrollControls =
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['top', 'bottom'].includes(this.placement) && this.nav.scrollWidth > this.nav.clientWidth;
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}
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}
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}
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setActiveTab(tab: SlTab, options?: { emitEvents?: boolean; scrollBehavior?: 'auto' | 'smooth' }) {
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options = Object.assign(
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{
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emitEvents: true,
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scrollBehavior: 'auto'
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},
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options
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);
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if (tab && tab !== this.activeTab && !tab.disabled) {
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const previousTab = this.activeTab;
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this.activeTab = tab;
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// Sync active tab and panel
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this.tabs.map(el => (el.active = el === this.activeTab));
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this.panels.map(el => (el.active = el.name === this.activeTab.panel));
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this.syncIndicator();
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if (['top', 'bottom'].includes(this.placement)) {
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scrollIntoView(this.activeTab, this.nav, 'horizontal', options.scrollBehavior);
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}
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// Emit events
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if (options.emitEvents) {
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if (previousTab) {
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this.slTabHide.emit({ detail: { name: previousTab.panel } });
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}
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this.slTabShow.emit({ detail: { name: this.activeTab.panel } });
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}
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}
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}
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setAriaLabels() {
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// Link each tab with its corresponding panel
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this.tabs.map(tab => {
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const panel = this.panels.find(el => el.name === tab.panel) as SlTabPanel;
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if (panel) {
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tab.setAttribute('aria-controls', panel.getAttribute('id') as string);
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panel.setAttribute('aria-labelledby', tab.getAttribute('id') as string);
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}
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});
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}
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@watch('placement')
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syncIndicator() {
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if (this.indicator) {
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const tab = this.getActiveTab();
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2021-01-18 19:03:59 +00:00
|
|
|
|
2021-03-08 14:08:29 +00:00
|
|
|
if (tab) {
|
2021-03-11 14:20:54 +00:00
|
|
|
this.indicator.style.display = 'block';
|
|
|
|
this.repositionIndicator();
|
2021-03-08 14:08:29 +00:00
|
|
|
} else {
|
2021-03-11 14:20:54 +00:00
|
|
|
this.indicator.style.display = 'none';
|
2021-03-08 14:08:29 +00:00
|
|
|
return;
|
|
|
|
}
|
2021-03-11 14:11:06 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2021-03-11 14:20:54 +00:00
|
|
|
repositionIndicator() {
|
2021-03-11 14:11:06 +00:00
|
|
|
const currentTab = this.getActiveTab();
|
|
|
|
|
2021-03-11 14:20:54 +00:00
|
|
|
if (!currentTab) {
|
2021-03-11 14:11:06 +00:00
|
|
|
return;
|
2020-07-15 21:30:37 +00:00
|
|
|
}
|
2021-03-11 14:11:06 +00:00
|
|
|
|
|
|
|
const width = currentTab.clientWidth;
|
|
|
|
const height = currentTab.clientHeight;
|
|
|
|
const offset = getOffset(currentTab, this.nav);
|
|
|
|
const offsetTop = offset.top + this.nav.scrollTop;
|
|
|
|
const offsetLeft = offset.left + this.nav.scrollLeft;
|
|
|
|
|
|
|
|
switch (this.placement) {
|
|
|
|
case 'top':
|
|
|
|
case 'bottom':
|
2021-03-11 14:20:54 +00:00
|
|
|
this.indicator.style.width = `${width}px`;
|
2021-03-22 21:26:56 +00:00
|
|
|
this.indicator.style.height = 'auto';
|
2021-03-11 14:20:54 +00:00
|
|
|
this.indicator.style.transform = `translateX(${offsetLeft}px)`;
|
2021-03-11 14:11:06 +00:00
|
|
|
break;
|
|
|
|
|
2021-05-26 11:32:51 +00:00
|
|
|
case 'start':
|
|
|
|
case 'end':
|
2021-03-22 21:26:56 +00:00
|
|
|
this.indicator.style.width = 'auto';
|
2021-03-11 14:20:54 +00:00
|
|
|
this.indicator.style.height = `${height}px`;
|
|
|
|
this.indicator.style.transform = `translateY(${offsetTop}px)`;
|
2021-03-11 14:11:06 +00:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2021-03-11 14:20:54 +00:00
|
|
|
// In some orientations, when the component is resized, the indicator's position will change causing it to animate
|
|
|
|
// while you resize. Calling this method will prevent the transition from running on resize, which feels more natural.
|
|
|
|
preventIndicatorTransition() {
|
|
|
|
const transitionValue = this.indicator.style.transition;
|
|
|
|
this.indicator.style.transition = 'none';
|
2021-03-11 14:11:06 +00:00
|
|
|
|
|
|
|
requestAnimationFrame(() => {
|
2021-03-11 14:20:54 +00:00
|
|
|
this.indicator.style.transition = transitionValue;
|
2021-03-11 14:11:06 +00:00
|
|
|
});
|
2020-07-15 21:30:37 +00:00
|
|
|
}
|
|
|
|
|
2021-04-07 21:05:38 +00:00
|
|
|
// This stores tabs and panels so we can refer to a cache instead of calling querySelectorAll() multiple times.
|
2021-02-26 14:09:13 +00:00
|
|
|
syncTabsAndPanels() {
|
|
|
|
this.tabs = this.getAllTabs();
|
|
|
|
this.panels = this.getAllPanels();
|
2021-03-11 14:20:54 +00:00
|
|
|
this.syncIndicator();
|
2021-02-26 14:09:13 +00:00
|
|
|
}
|
|
|
|
|
2020-07-15 21:30:37 +00:00
|
|
|
render() {
|
2021-02-26 14:09:13 +00:00
|
|
|
return html`
|
2020-07-15 21:30:37 +00:00
|
|
|
<div
|
|
|
|
part="base"
|
2021-02-26 14:09:13 +00:00
|
|
|
class=${classMap({
|
2020-07-15 21:30:37 +00:00
|
|
|
'tab-group': true,
|
|
|
|
'tab-group--top': this.placement === 'top',
|
|
|
|
'tab-group--bottom': this.placement === 'bottom',
|
2021-05-26 11:32:51 +00:00
|
|
|
'tab-group--start': this.placement === 'start',
|
|
|
|
'tab-group--end': this.placement === 'end',
|
2020-10-22 18:00:06 +00:00
|
|
|
'tab-group--has-scroll-controls': this.hasScrollControls
|
2021-02-26 14:09:13 +00:00
|
|
|
})}
|
2021-03-06 17:01:39 +00:00
|
|
|
@click=${this.handleClick}
|
|
|
|
@keydown=${this.handleKeyDown}
|
2020-07-15 21:30:37 +00:00
|
|
|
>
|
2020-08-03 11:40:02 +00:00
|
|
|
<div class="tab-group__nav-container">
|
2021-02-26 14:09:13 +00:00
|
|
|
${this.hasScrollControls
|
|
|
|
? html`
|
|
|
|
<sl-icon-button
|
2021-06-01 12:21:10 +00:00
|
|
|
class="tab-group__scroll-button tab-group__scroll-button--start"
|
2021-02-26 14:09:13 +00:00
|
|
|
exportparts="base:scroll-button"
|
|
|
|
name="chevron-left"
|
2021-04-20 13:37:19 +00:00
|
|
|
library="system"
|
2021-06-01 12:21:10 +00:00
|
|
|
@click=${this.handleScrollToStart}
|
2021-03-06 17:01:39 +00:00
|
|
|
></sl-icon-button>
|
2021-02-26 14:09:13 +00:00
|
|
|
`
|
|
|
|
: ''}
|
|
|
|
|
2021-03-06 17:01:39 +00:00
|
|
|
<div part="nav" class="tab-group__nav">
|
2021-02-26 14:09:13 +00:00
|
|
|
<div part="tabs" class="tab-group__tabs" role="tablist">
|
2021-03-11 14:20:54 +00:00
|
|
|
<div part="active-tab-indicator" class="tab-group__indicator"></div>
|
2021-03-06 17:01:39 +00:00
|
|
|
<slot name="nav" @slotchange=${this.syncTabsAndPanels}></slot>
|
2020-08-03 11:40:02 +00:00
|
|
|
</div>
|
2020-07-15 21:30:37 +00:00
|
|
|
</div>
|
2021-02-26 14:09:13 +00:00
|
|
|
|
|
|
|
${this.hasScrollControls
|
|
|
|
? html`
|
|
|
|
<sl-icon-button
|
2021-06-01 12:21:10 +00:00
|
|
|
class="tab-group__scroll-button tab-group__scroll-button--end"
|
2021-02-26 14:09:13 +00:00
|
|
|
exportparts="base:scroll-button"
|
|
|
|
name="chevron-right"
|
2021-04-20 13:37:19 +00:00
|
|
|
library="system"
|
2021-06-01 12:21:10 +00:00
|
|
|
@click=${this.handleScrollToEnd}
|
2021-03-06 17:01:39 +00:00
|
|
|
></sl-icon-button>
|
2021-02-26 14:09:13 +00:00
|
|
|
`
|
|
|
|
: ''}
|
2020-07-15 21:30:37 +00:00
|
|
|
</div>
|
|
|
|
|
2021-03-06 17:01:39 +00:00
|
|
|
<div part="body" class="tab-group__body">
|
|
|
|
<slot @slotchange=${this.syncTabsAndPanels}></slot>
|
2020-07-15 21:30:37 +00:00
|
|
|
</div>
|
|
|
|
</div>
|
2021-02-26 14:09:13 +00:00
|
|
|
`;
|
2020-07-15 21:30:37 +00:00
|
|
|
}
|
|
|
|
}
|
2021-03-12 14:07:38 +00:00
|
|
|
|
2021-03-12 14:09:08 +00:00
|
|
|
declare global {
|
|
|
|
interface HTMLElementTagNameMap {
|
|
|
|
'sl-tab-group': SlTabGroup;
|
|
|
|
}
|
|
|
|
}
|