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feat(cdk-experimental/ui-patterns): tabs ui pattern
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‎src/cdk-experimental/tabs/BUILD.bazel‎

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load("//tools:defaults.bzl", "ng_module")
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package(default_visibility = ["//visibility:public"])
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ng_module(
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name = "tabs",
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srcs = glob(
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["**/*.ts"],
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exclude = ["**/*.spec.ts"],
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),
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deps = [
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"//src/cdk-experimental/ui-patterns/tabs",
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"//src/cdk/a11y",
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"//src/cdk/bidi",
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],
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)

‎src/cdk-experimental/tabs/index.ts‎

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/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.dev/license
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*/
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export * from './public-api';

‎src/cdk-experimental/tabs/public-api.ts‎

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/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.dev/license
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*/
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export {CdkTabs, CdkTablist, CdkTab, CdkTabpanel} from './tabs';

‎src/cdk-experimental/tabs/tabs.ts‎

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/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.dev/license
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*/
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import {
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booleanAttribute,
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computed,
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contentChildren,
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Directive,
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ElementRef,
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inject,
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input,
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model,
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} from '@angular/core';
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import {Directionality} from '@angular/cdk/bidi';
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import {TabPattern} from '@angular/cdk-experimental/ui-patterns/tabs/tab';
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import {TablistPattern} from '@angular/cdk-experimental/ui-patterns/tabs/tablist';
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import {TabpanelPattern} from '@angular/cdk-experimental/ui-patterns/tabs/tabpanel';
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import {toSignal} from '@angular/core/rxjs-interop';
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import {_IdGenerator} from '@angular/cdk/a11y';
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@Directive({
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selector: '[cdkTabs]',
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exportAs: 'cdkTabs',
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host: {
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'class': 'cdk-tabs',
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},
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})
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export class CdkTabs {
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/** The CdkTabs nested inside of the container. */
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private readonly _cdkTabs = contentChildren(CdkTab, {descendants: true});
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/** The CdkTabpanels nested inside of the container. */
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private readonly _cdkTabpanels = contentChildren(CdkTabpanel, {descendants: true});
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/** The Tab UIPattern of the child Tabs. */
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tabs = computed(() => this._cdkTabs().map(tab => tab.pattern));
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/** The Tabpanel UIPattern of the child Tabpanels. */
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tabpanels = computed(() => this._cdkTabpanels().map(tabpanel => tabpanel.pattern));
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}
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@Directive({
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selector: '[cdkTablist]',
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exportAs: 'cdkTablist',
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host: {
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'role': 'tablist',
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'class': 'cdk-tablist',
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'[attr.tabindex]': 'pattern.tabindex()',
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'[attr.aria-disabled]': 'pattern.disabled()',
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'[attr.aria-orientation]': 'pattern.orientation()',
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'[attr.aria-multiselectable]': 'pattern.multiselectable()',
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'[attr.aria-activedescendant]': 'pattern.activedescendant()',
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'(keydown)': 'pattern.onKeydown($event)',
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'(mousedown)': 'pattern.onPointerdown($event)',
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},
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})
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export class CdkTablist {
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/** The directionality (LTR / RTL) context for the application (or a subtree of it). */
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private readonly _directionality = inject(Directionality);
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/** The CdkTabs nested inside of the CdkTablist. */
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private readonly _cdkTabs = contentChildren(CdkTab, {descendants: true});
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/** A signal wrapper for directionality. */
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protected textDirection = toSignal(this._directionality.change, {
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initialValue: this._directionality.value,
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});
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/** The Tab UIPatterns of the child Tabs. */
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protected items = computed(() => this._cdkTabs().map(tab => tab.pattern));
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/** Whether the tablist is vertically or horizontally oriented. */
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orientation = input<'vertical' | 'horizontal'>('horizontal');
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/** Whether multiple items in the list can be selected at once. */
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multiselectable = input(false, {transform: booleanAttribute});
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/** Whether focus should wrap when navigating. */
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wrap = input(true, {transform: booleanAttribute});
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/** Whether disabled items in the list should be skipped when navigating. */
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skipDisabled = input(true, {transform: booleanAttribute});
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/** The focus strategy used by the tablist. */
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focusMode = input<'roving' | 'activedescendant'>('roving');
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/** The selection strategy used by the tablist. */
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selectionMode = input<'follow' | 'explicit'>('follow');
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/** Whether the tablist is disabled. */
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disabled = input(false, {transform: booleanAttribute});
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/** The ids of the current selected tab. */
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selectedIds = model<string[]>([]);
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/** The current index that has been navigated to. */
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activeIndex = model<number>(0);
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/** The Tablist UIPattern. */
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pattern: TablistPattern = new TablistPattern({
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...this,
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items: this.items,
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textDirection: this.textDirection,
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});
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}
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@Directive({
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selector: '[cdkTab]',
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exportAs: 'cdkTab',
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host: {
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'role': 'tab',
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'class': 'cdk-tab',
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'[attr.id]': 'pattern.id()',
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'[attr.tabindex]': 'pattern.tabindex()',
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'[attr.aria-selected]': 'pattern.selected()',
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'[attr.aria-disabled]': 'pattern.disabled()',
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'[attr.aria-controls]': 'pattern.controls()',
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},
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})
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export class CdkTab {
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/** A reference to the tab element. */
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private readonly _elementRef = inject(ElementRef);
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/** The parent CdkTabs. */
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private readonly _cdkTabs = inject(CdkTabs);
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/** The parent CdkTablist. */
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private readonly _cdkTablist = inject(CdkTablist);
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/** A unique identifier for the tab. */
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private readonly _generatedId = inject(_IdGenerator).getId('cdk-tab-');
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/** A unique identifier for the tab. */
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protected id = computed(() => this._generatedId);
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/** A reference to the tab element to be focused on navigation. */
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protected element = computed(() => this._elementRef.nativeElement);
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/** The position of the tab in the list. */
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protected index = computed(() => this._cdkTabs.tabs().findIndex(tab => tab.id === this.id));
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/** The parent Tablist UIPattern. */
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protected tablist = computed(() => this._cdkTablist.pattern);
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/** The Tabpanel UIPattern associated with the tab */
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protected tabpanel = computed(() => this._cdkTabs.tabpanels()[this.index()]);
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/** Whether a tab is disabled. */
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disabled = input(false, {transform: booleanAttribute});
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/** The Tab UIPattern. */
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pattern: TabPattern = new TabPattern({
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...this,
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id: this.id,
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tablist: this.tablist,
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tabpanel: this.tabpanel,
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element: this.element,
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});
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}
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@Directive({
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selector: '[cdkTabpanel]',
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exportAs: 'cdkTabpanel',
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host: {
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'role': 'tabpanel',
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'class': 'cdk-tabpanel',
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'[attr.id]': 'pattern.id()',
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'[attr.aria-hidden]': 'pattern.hidden()',
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},
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})
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export class CdkTabpanel {
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/** The parent CdkTabs. */
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private readonly _cdkTabs = inject(CdkTabs);
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/** A unique identifier for the tab. */
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private readonly _generatedId = inject(_IdGenerator).getId('cdk-tabpanel-');
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/** A unique identifier for the tabpanel. */
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protected id = computed(() => this._generatedId);
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/** The position of the tabpanel in the tabs. */
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protected index = computed(() =>
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this._cdkTabs.tabpanels().findIndex(tabpanel => tabpanel.id === this.id),
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);
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/** The Tab UIPattern associated with the tabpanel */
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protected tab = computed(() => this._cdkTabs.tabs()[this.index()]);
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/** The Tabpanel UIPattern. */
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pattern: TabpanelPattern = new TabpanelPattern({
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...this,
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id: this.id,
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tab: this.tab,
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});
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}

‎src/cdk-experimental/ui-patterns/BUILD.bazel‎

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),
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deps = [
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"//src/cdk-experimental/ui-patterns/listbox",
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"//src/cdk-experimental/ui-patterns/tabs",
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"@npm//@angular/core",
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],
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)

‎src/cdk-experimental/ui-patterns/public-api.ts‎

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export * from './listbox/listbox';
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export * from './listbox/option';
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export * from './tabs/tab';
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export * from './tabs/tablist';
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export * from './tabs/tabpanel';

‎src/cdk-experimental/ui-patterns/tabs/BUILD.bazel‎

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load("//tools:defaults.bzl", "ts_library")
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package(default_visibility = ["//visibility:public"])
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ts_library(
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name = "tabs",
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srcs = glob(
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["**/*.ts"],
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exclude = ["**/*.spec.ts"],
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),
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deps = [
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"//src/cdk-experimental/ui-patterns/behaviors/event-manager",
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"//src/cdk-experimental/ui-patterns/behaviors/list-focus",
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"//src/cdk-experimental/ui-patterns/behaviors/list-navigation",
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"//src/cdk-experimental/ui-patterns/behaviors/list-selection",
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"@npm//@angular/core",
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],
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)

‎src/cdk-experimental/ui-patterns/tabs/tab.ts‎

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/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.dev/license
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*/
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import {computed, Signal} from '@angular/core';
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import {ListSelection, ListSelectionItem} from '../behaviors/list-selection/list-selection';
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import {ListNavigation, ListNavigationItem} from '../behaviors/list-navigation/list-navigation';
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import {ListFocus, ListFocusItem} from '../behaviors/list-focus/list-focus';
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import {TabpanelPattern} from './tabpanel';
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interface TablistPattern {
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focusManager: ListFocus<TabPattern>;
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selection: ListSelection<TabPattern>;
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navigation: ListNavigation<TabPattern>;
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}
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/** The required inputs to tabs. */
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export interface TabInputs extends ListNavigationItem, ListSelectionItem, ListFocusItem {
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tablist: Signal<TablistPattern>;
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tabpanel: Signal<TabpanelPattern>;
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}
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/** A tab in a tablist. */
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export class TabPattern {
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/** A unique identifier for the tab. */
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id: Signal<string>;
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/** The position of the tab in the list. */
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index = computed(
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() =>
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this.tablist()
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.navigation.inputs.items()
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.findIndex(i => i.id() === this.id()) ?? -1,
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);
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/** Whether the tab is selected. */
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selected = computed(() => this.tablist().selection.inputs.selectedIds().includes(this.id()));
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/** A Tabpanel Id controlled by the tab. */
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controls = computed(() => this.tabpanel().id());
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/** Whether the tab is disabled. */
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disabled: Signal<boolean>;
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/** A reference to the parent tablist. */
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tablist: Signal<TablistPattern>;
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/** A reference to the corresponding tabpanel. */
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tabpanel: Signal<TabpanelPattern>;
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/** The tabindex of the tab. */
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tabindex = computed(() => this.tablist().focusManager.getItemTabindex(this));
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/** The html element that should receive focus. */
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element: Signal<HTMLElement>;
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constructor(args: TabInputs) {
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this.id = args.id;
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this.tablist = args.tablist;
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this.tabpanel = args.tabpanel;
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this.element = args.element;
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this.disabled = args.disabled;
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}
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}

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