source: trip-planner-front/node_modules/@angular/material/fesm2015/tabs.js.map@ 188ee53

{"version":3,"file":"tabs.js","sources":["../../../../../../src/material/tabs/ink-bar.ts","../../../../../../src/material/tabs/tab-content.ts","../../../../../../src/material/tabs/tab-label.ts","../../../../../../src/material/tabs/tab.ts","../../../../../../src/material/tabs/tabs-animations.ts","../../../../../../src/material/tabs/tab-body.ts","../../../../../../src/material/tabs/tab-config.ts","../../../../../../src/material/tabs/tab-group.ts","../../../../../../src/material/tabs/tab-label-wrapper.ts","../../../../../../src/material/tabs/paginated-tab-header.ts","../../../../../../src/material/tabs/tab-header.ts","../../../../../../src/material/tabs/tab-nav-bar/tab-nav-bar.ts","../../../../../../src/material/tabs/tabs-module.ts","../../../../../../src/material/tabs/tab-nav-bar/index.ts","../../../../../../src/material/tabs/public-api.ts","../../../../../../src/material/tabs/index.ts"],"sourcesContent":["/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Directive, ElementRef, Inject, InjectionToken, NgZone, Optional} from '@angular/core';\nimport {ANIMATION_MODULE_TYPE} from '@angular/platform-browser/animations';\n\n\n/**\n * Interface for a a MatInkBar positioner method, defining the positioning and width of the ink\n * bar in a set of tabs.\n */\nexport interface _MatInkBarPositioner {\n  (element: HTMLElement): { left: string, width: string };\n}\n\n/** Injection token for the MatInkBar's Positioner. */\nexport const _MAT_INK_BAR_POSITIONER =\n  new InjectionToken<_MatInkBarPositioner>('MatInkBarPositioner', {\n    providedIn: 'root',\n    factory: _MAT_INK_BAR_POSITIONER_FACTORY\n  });\n\n/**\n * The default positioner function for the MatInkBar.\n * @docs-private\n */\nexport function _MAT_INK_BAR_POSITIONER_FACTORY(): _MatInkBarPositioner {\n  const method = (element: HTMLElement) => ({\n    left: element ? (element.offsetLeft || 0) + 'px' : '0',\n    width: element ? (element.offsetWidth || 0) + 'px' : '0',\n  });\n\n  return method;\n}\n\n/**\n * The ink-bar is used to display and animate the line underneath the current active tab label.\n * @docs-private\n */\n@Directive({\n  selector: 'mat-ink-bar',\n  host: {\n    'class': 'mat-ink-bar',\n    '[class._mat-animation-noopable]': `_animationMode === 'NoopAnimations'`,\n  },\n})\nexport class MatInkBar {\n  constructor(\n    private _elementRef: ElementRef<HTMLElement>,\n    private _ngZone: NgZone,\n    @Inject(_MAT_INK_BAR_POSITIONER) private _inkBarPositioner: _MatInkBarPositioner,\n    @Optional() @Inject(ANIMATION_MODULE_TYPE) public _animationMode?: string) { }\n\n  /**\n   * Calculates the styles from the provided element in order to align the ink-bar to that element.\n   * Shows the ink bar if previously set as hidden.\n   * @param element\n   */\n  alignToElement(element: HTMLElement) {\n    this.show();\n\n    if (typeof requestAnimationFrame !== 'undefined') {\n      this._ngZone.runOutsideAngular(() => {\n        requestAnimationFrame(() => this._setStyles(element));\n      });\n    } else {\n      this._setStyles(element);\n    }\n  }\n\n  /** Shows the ink bar. */\n  show(): void {\n    this._elementRef.nativeElement.style.visibility = 'visible';\n  }\n\n  /** Hides the ink bar. */\n  hide(): void {\n    this._elementRef.nativeElement.style.visibility = 'hidden';\n  }\n\n  /**\n   * Sets the proper styles to the ink bar element.\n   * @param element\n   */\n  private _setStyles(element: HTMLElement) {\n    const positions = this._inkBarPositioner(element);\n    const inkBar: HTMLElement = this._elementRef.nativeElement;\n\n    inkBar.style.left = positions.left;\n    inkBar.style.width = positions.width;\n  }\n}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Directive, InjectionToken, TemplateRef} from '@angular/core';\n\n/**\n * Injection token that can be used to reference instances of `MatTabContent`. It serves as\n * alternative token to the actual `MatTabContent` class which could cause unnecessary\n * retention of the class and its directive metadata.\n */\nexport const MAT_TAB_CONTENT = new InjectionToken<MatTabContent>('MatTabContent');\n\n/** Decorates the `ng-template` tags and reads out the template from it. */\n@Directive({\n  selector: '[matTabContent]',\n  providers: [{provide: MAT_TAB_CONTENT, useExisting: MatTabContent}],\n})\nexport class MatTabContent {\n  constructor(\n    /** Content for the tab. */ public template: TemplateRef<any>) {}\n}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {\n  Directive,\n  Inject,\n  InjectionToken,\n  Optional,\n  TemplateRef,\n  ViewContainerRef,\n} from '@angular/core';\nimport {CdkPortal} from '@angular/cdk/portal';\n\n/**\n * Injection token that can be used to reference instances of `MatTabLabel`. It serves as\n * alternative token to the actual `MatTabLabel` class which could cause unnecessary\n * retention of the class and its directive metadata.\n */\nexport const MAT_TAB_LABEL = new InjectionToken<MatTabLabel>('MatTabLabel');\n\n/**\n * Used to provide a tab label to a tab without causing a circular dependency.\n * @docs-private\n */\n export const MAT_TAB = new InjectionToken<any>('MAT_TAB');\n\n/** Used to flag tab labels for use with the portal directive */\n@Directive({\n  selector: '[mat-tab-label], [matTabLabel]',\n  providers: [{provide: MAT_TAB_LABEL, useExisting: MatTabLabel}],\n})\nexport class MatTabLabel extends CdkPortal {\n  constructor(\n    templateRef: TemplateRef<any>,\n    viewContainerRef: ViewContainerRef,\n    @Inject(MAT_TAB) @Optional() public _closestTab: any) {\n    super(templateRef, viewContainerRef);\n  }\n}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {BooleanInput} from '@angular/cdk/coercion';\nimport {TemplatePortal} from '@angular/cdk/portal';\nimport {\n  ChangeDetectionStrategy,\n  Component,\n  ContentChild,\n  Input,\n  OnChanges,\n  OnDestroy,\n  OnInit,\n  SimpleChanges,\n  TemplateRef,\n  ViewChild,\n  ViewContainerRef,\n  ViewEncapsulation,\n  InjectionToken,\n  Inject,\n  Optional,\n} from '@angular/core';\nimport {CanDisable, mixinDisabled} from '@angular/material/core';\nimport {Subject} from 'rxjs';\nimport {MAT_TAB_CONTENT} from './tab-content';\nimport {MAT_TAB_LABEL, MatTabLabel, MAT_TAB} from './tab-label';\n\n\n// Boilerplate for applying mixins to MatTab.\n/** @docs-private */\nconst _MatTabBase = mixinDisabled(class {});\n\n/**\n * Used to provide a tab group to a tab without causing a circular dependency.\n * @docs-private\n */\nexport const MAT_TAB_GROUP = new InjectionToken<any>('MAT_TAB_GROUP');\n\n@Component({\n  selector: 'mat-tab',\n  templateUrl: 'tab.html',\n  inputs: ['disabled'],\n  // tslint:disable-next-line:validate-decorators\n  changeDetection: ChangeDetectionStrategy.Default,\n  encapsulation: ViewEncapsulation.None,\n  exportAs: 'matTab',\n  providers: [{provide: MAT_TAB, useExisting: MatTab}]\n})\nexport class MatTab extends _MatTabBase implements OnInit, CanDisable, OnChanges, OnDestroy {\n  /** Content for the tab label given by `<ng-template mat-tab-label>`. */\n  @ContentChild(MAT_TAB_LABEL)\n  get templateLabel(): MatTabLabel { return this._templateLabel; }\n  set templateLabel(value: MatTabLabel) { this._setTemplateLabelInput(value); }\n  protected _templateLabel: MatTabLabel;\n\n  /**\n   * Template provided in the tab content that will be used if present, used to enable lazy-loading\n   */\n  @ContentChild(MAT_TAB_CONTENT, {read: TemplateRef, static: true})\n  _explicitContent: TemplateRef<any>;\n\n  /** Template inside the MatTab view that contains an `<ng-content>`. */\n  @ViewChild(TemplateRef, {static: true}) _implicitContent: TemplateRef<any>;\n\n  /** Plain text label for the tab, used when there is no template label. */\n  @Input('label') textLabel: string = '';\n\n  /** Aria label for the tab. */\n  @Input('aria-label') ariaLabel: string;\n\n  /**\n   * Reference to the element that the tab is labelled by.\n   * Will be cleared if `aria-label` is set at the same time.\n   */\n  @Input('aria-labelledby') ariaLabelledby: string;\n\n  /** Portal that will be the hosted content of the tab */\n  private _contentPortal: TemplatePortal | null = null;\n\n  /** @docs-private */\n  get content(): TemplatePortal | null {\n    return this._contentPortal;\n  }\n\n  /** Emits whenever the internal state of the tab changes. */\n  readonly _stateChanges = new Subject<void>();\n\n  /**\n   * The relatively indexed position where 0 represents the center, negative is left, and positive\n   * represents the right.\n   */\n  position: number | null = null;\n\n  /**\n   * The initial relatively index origin of the tab if it was created and selected after there\n   * was already a selected tab. Provides context of what position the tab should originate from.\n   */\n  origin: number | null = null;\n\n  /**\n   * Whether the tab is currently active.\n   */\n  isActive = false;\n\n  constructor(\n    private _viewContainerRef: ViewContainerRef,\n    @Inject(MAT_TAB_GROUP) @Optional() public _closestTabGroup: any) {\n    super();\n  }\n\n  ngOnChanges(changes: SimpleChanges): void {\n    if (changes.hasOwnProperty('textLabel') || changes.hasOwnProperty('disabled')) {\n      this._stateChanges.next();\n    }\n  }\n\n  ngOnDestroy(): void {\n    this._stateChanges.complete();\n  }\n\n  ngOnInit(): void {\n    this._contentPortal = new TemplatePortal(\n        this._explicitContent || this._implicitContent, this._viewContainerRef);\n  }\n\n  /**\n   * This has been extracted to a util because of TS 4 and VE.\n   * View Engine doesn't support property rename inheritance.\n   * TS 4.0 doesn't allow properties to override accessors or vice-versa.\n   * @docs-private\n   */\n  protected _setTemplateLabelInput(value: MatTabLabel|undefined) {\n    // Only update the label if the query managed to find one. This works around an issue where a\n    // user may have manually set `templateLabel` during creation mode, which would then get\n    // clobbered by `undefined` when the query resolves. Also note that we check that the closest\n    // tab matches the current one so that we don't pick up labels from nested tabs.\n    if (value && value._closestTab === this) {\n      this._templateLabel = value;\n    }\n  }\n\n  static ngAcceptInputType_disabled: BooleanInput;\n}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\nimport {\n  animate,\n  state,\n  style,\n  transition,\n  trigger,\n  AnimationTriggerMetadata,\n} from '@angular/animations';\n\n/**\n * Animations used by the Material tabs.\n * @docs-private\n */\nexport const matTabsAnimations: {\n  readonly translateTab: AnimationTriggerMetadata;\n} = {\n  /** Animation translates a tab along the X axis. */\n  translateTab: trigger('translateTab', [\n    // Note: transitions to `none` instead of 0, because some browsers might blur the content.\n    state('center, void, left-origin-center, right-origin-center', style({transform: 'none'})),\n\n    // If the tab is either on the left or right, we additionally add a `min-height` of 1px\n    // in order to ensure that the element has a height before its state changes. This is\n    // necessary because Chrome does seem to skip the transition in RTL mode if the element does\n    // not have a static height and is not rendered. See related issue: #9465\n    state('left', style({transform: 'translate3d(-100%, 0, 0)', minHeight: '1px'})),\n    state('right', style({transform: 'translate3d(100%, 0, 0)', minHeight: '1px'})),\n\n    transition('* => left, * => right, left => center, right => center',\n        animate('{{animationDuration}} cubic-bezier(0.35, 0, 0.25, 1)')),\n    transition('void => left-origin-center', [\n      style({transform: 'translate3d(-100%, 0, 0)'}),\n      animate('{{animationDuration}} cubic-bezier(0.35, 0, 0.25, 1)')\n    ]),\n    transition('void => right-origin-center', [\n      style({transform: 'translate3d(100%, 0, 0)'}),\n      animate('{{animationDuration}} cubic-bezier(0.35, 0, 0.25, 1)')\n    ])\n  ])\n};\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {\n  Component,\n  ChangeDetectorRef,\n  Input,\n  Inject,\n  Output,\n  EventEmitter,\n  OnDestroy,\n  OnInit,\n  ElementRef,\n  Directive,\n  Optional,\n  ViewEncapsulation,\n  ChangeDetectionStrategy,\n  ComponentFactoryResolver,\n  ViewContainerRef,\n  forwardRef,\n  ViewChild,\n} from '@angular/core';\nimport {AnimationEvent} from '@angular/animations';\nimport {TemplatePortal, CdkPortalOutlet} from '@angular/cdk/portal';\nimport {Directionality, Direction} from '@angular/cdk/bidi';\nimport {DOCUMENT} from '@angular/common';\nimport {Subscription, Subject} from 'rxjs';\nimport {matTabsAnimations} from './tabs-animations';\nimport {startWith, distinctUntilChanged} from 'rxjs/operators';\n\n/**\n * These position states are used internally as animation states for the tab body. Setting the\n * position state to left, right, or center will transition the tab body from its current\n * position to its respective state. If there is not current position (void, in the case of a new\n * tab body), then there will be no transition animation to its state.\n *\n * In the case of a new tab body that should immediately be centered with an animating transition,\n * then left-origin-center or right-origin-center can be used, which will use left or right as its\n * psuedo-prior state.\n */\nexport type MatTabBodyPositionState =\n    'left' | 'center' | 'right' | 'left-origin-center' | 'right-origin-center';\n\n/**\n * The origin state is an internally used state that is set on a new tab body indicating if it\n * began to the left or right of the prior selected index. For example, if the selected index was\n * set to 1, and a new tab is created and selected at index 2, then the tab body would have an\n * origin of right because its index was greater than the prior selected index.\n */\nexport type MatTabBodyOriginState = 'left' | 'right';\n\n/**\n * The portal host directive for the contents of the tab.\n * @docs-private\n */\n@Directive({\n  selector: '[matTabBodyHost]'\n})\nexport class MatTabBodyPortal extends CdkPortalOutlet implements OnInit, OnDestroy {\n  /** Subscription to events for when the tab body begins centering. */\n  private _centeringSub = Subscription.EMPTY;\n  /** Subscription to events for when the tab body finishes leaving from center position. */\n  private _leavingSub = Subscription.EMPTY;\n\n  constructor(\n    componentFactoryResolver: ComponentFactoryResolver,\n    viewContainerRef: ViewContainerRef,\n    @Inject(forwardRef(() => MatTabBody)) private _host: MatTabBody,\n    @Inject(DOCUMENT) _document: any) {\n    super(componentFactoryResolver, viewContainerRef, _document);\n  }\n\n  /** Set initial visibility or set up subscription for changing visibility. */\n  override ngOnInit(): void {\n    super.ngOnInit();\n\n    this._centeringSub = this._host._beforeCentering\n      .pipe(startWith(this._host._isCenterPosition(this._host._position)))\n      .subscribe((isCentering: boolean) => {\n        if (isCentering && !this.hasAttached()) {\n          this.attach(this._host._content);\n        }\n      });\n\n    this._leavingSub = this._host._afterLeavingCenter.subscribe(() => {\n      this.detach();\n    });\n  }\n\n  /** Clean up centering subscription. */\n  override ngOnDestroy(): void {\n    super.ngOnDestroy();\n    this._centeringSub.unsubscribe();\n    this._leavingSub.unsubscribe();\n  }\n}\n\n/**\n * Base class with all of the `MatTabBody` functionality.\n * @docs-private\n */\n@Directive()\nexport abstract class _MatTabBodyBase implements OnInit, OnDestroy {\n  /** Current position of the tab-body in the tab-group. Zero means that the tab is visible. */\n  private _positionIndex: number;\n\n  /** Subscription to the directionality change observable. */\n  private _dirChangeSubscription = Subscription.EMPTY;\n\n  /** Tab body position state. Used by the animation trigger for the current state. */\n  _position: MatTabBodyPositionState;\n\n  /** Emits when an animation on the tab is complete. */\n  readonly _translateTabComplete = new Subject<AnimationEvent>();\n\n  /** Event emitted when the tab begins to animate towards the center as the active tab. */\n  @Output() readonly _onCentering: EventEmitter<number> = new EventEmitter<number>();\n\n  /** Event emitted before the centering of the tab begins. */\n  @Output() readonly _beforeCentering: EventEmitter<boolean> = new EventEmitter<boolean>();\n\n  /** Event emitted before the centering of the tab begins. */\n  @Output() readonly _afterLeavingCenter: EventEmitter<void> = new EventEmitter<void>();\n\n  /** Event emitted when the tab completes its animation towards the center. */\n  @Output() readonly _onCentered: EventEmitter<void> = new EventEmitter<void>(true);\n\n   /** The portal host inside of this container into which the tab body content will be loaded. */\n  abstract _portalHost: CdkPortalOutlet;\n\n  /** The tab body content to display. */\n  @Input('content') _content: TemplatePortal;\n\n  /** Position that will be used when the tab is immediately becoming visible after creation. */\n  @Input() origin: number | null;\n\n  // Note that the default value will always be overwritten by `MatTabBody`, but we need one\n  // anyway to prevent the animations module from throwing an error if the body is used on its own.\n  /** Duration for the tab's animation. */\n  @Input() animationDuration: string = '500ms';\n\n  /** The shifted index position of the tab body, where zero represents the active center tab. */\n  @Input()\n  set position(position: number) {\n    this._positionIndex = position;\n    this._computePositionAnimationState();\n  }\n\n  constructor(private _elementRef: ElementRef<HTMLElement>,\n              @Optional() private _dir: Directionality,\n              changeDetectorRef: ChangeDetectorRef) {\n\n    if (_dir) {\n      this._dirChangeSubscription = _dir.change.subscribe((dir: Direction) => {\n        this._computePositionAnimationState(dir);\n        changeDetectorRef.markForCheck();\n      });\n    }\n\n    // Ensure that we get unique animation events, because the `.done` callback can get\n    // invoked twice in some browsers. See https://github.com/angular/angular/issues/24084.\n    this._translateTabComplete.pipe(distinctUntilChanged((x, y) => {\n      return x.fromState === y.fromState && x.toState === y.toState;\n    })).subscribe(event => {\n      // If the transition to the center is complete, emit an event.\n      if (this._isCenterPosition(event.toState) && this._isCenterPosition(this._position)) {\n        this._onCentered.emit();\n      }\n\n      if (this._isCenterPosition(event.fromState) && !this._isCenterPosition(this._position)) {\n        this._afterLeavingCenter.emit();\n      }\n    });\n  }\n\n  /**\n   * After initialized, check if the content is centered and has an origin. If so, set the\n   * special position states that transition the tab from the left or right before centering.\n   */\n  ngOnInit() {\n    if (this._position == 'center' && this.origin != null) {\n      this._position = this._computePositionFromOrigin(this.origin);\n    }\n  }\n\n  ngOnDestroy() {\n    this._dirChangeSubscription.unsubscribe();\n    this._translateTabComplete.complete();\n  }\n\n  _onTranslateTabStarted(event: AnimationEvent): void {\n    const isCentering = this._isCenterPosition(event.toState);\n    this._beforeCentering.emit(isCentering);\n    if (isCentering) {\n      this._onCentering.emit(this._elementRef.nativeElement.clientHeight);\n    }\n  }\n\n  /** The text direction of the containing app. */\n  _getLayoutDirection(): Direction {\n    return this._dir && this._dir.value === 'rtl' ? 'rtl' : 'ltr';\n  }\n\n  /** Whether the provided position state is considered center, regardless of origin. */\n  _isCenterPosition(position: MatTabBodyPositionState|string): boolean {\n    return position == 'center' ||\n        position == 'left-origin-center' ||\n        position == 'right-origin-center';\n  }\n\n  /** Computes the position state that will be used for the tab-body animation trigger. */\n  private _computePositionAnimationState(dir: Direction = this._getLayoutDirection()) {\n    if (this._positionIndex < 0) {\n      this._position = dir == 'ltr' ? 'left' : 'right';\n    } else if (this._positionIndex > 0) {\n      this._position = dir == 'ltr' ? 'right' : 'left';\n    } else {\n      this._position = 'center';\n    }\n  }\n\n  /**\n   * Computes the position state based on the specified origin position. This is used if the\n   * tab is becoming visible immediately after creation.\n   */\n  private _computePositionFromOrigin(origin: number): MatTabBodyPositionState {\n    const dir = this._getLayoutDirection();\n\n    if ((dir == 'ltr' && origin <= 0) || (dir == 'rtl' && origin > 0)) {\n      return 'left-origin-center';\n    }\n\n    return 'right-origin-center';\n  }\n}\n\n/**\n * Wrapper for the contents of a tab.\n * @docs-private\n */\n@Component({\n  selector: 'mat-tab-body',\n  templateUrl: 'tab-body.html',\n  styleUrls: ['tab-body.css'],\n  encapsulation: ViewEncapsulation.None,\n  // tslint:disable-next-line:validate-decorators\n  changeDetection: ChangeDetectionStrategy.Default,\n  animations: [matTabsAnimations.translateTab],\n  host: {\n    'class': 'mat-tab-body',\n  }\n})\nexport class MatTabBody extends _MatTabBodyBase {\n  @ViewChild(CdkPortalOutlet) _portalHost: CdkPortalOutlet;\n\n  constructor(elementRef: ElementRef<HTMLElement>,\n              @Optional() dir: Directionality,\n              changeDetectorRef: ChangeDetectorRef) {\n    super(elementRef, dir, changeDetectorRef);\n  }\n}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\nimport {InjectionToken} from '@angular/core';\n\n/** Object that can be used to configure the default options for the tabs module. */\nexport interface MatTabsConfig {\n  /** Duration for the tab animation. Must be a valid CSS value (e.g. 600ms). */\n  animationDuration?: string;\n\n  /**\n   * Whether pagination should be disabled. This can be used to avoid unnecessary\n   * layout recalculations if it's known that pagination won't be required.\n   */\n  disablePagination?: boolean;\n\n  /**\n   * Whether the ink bar should fit its width to the size of the tab label content.\n   * This only applies to the MDC-based tabs.\n   */\n  fitInkBarToContent?: boolean;\n\n  /** Whether the tab group should grow to the size of the active tab. */\n  dynamicHeight?: boolean;\n\n  /** `tabindex` to be set on the inner element that wraps the tab content. */\n  contentTabIndex?: number;\n}\n\n/** Injection token that can be used to provide the default options the tabs module. */\nexport const MAT_TABS_CONFIG = new InjectionToken<MatTabsConfig>('MAT_TABS_CONFIG');\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {\n  BooleanInput,\n  coerceBooleanProperty,\n  coerceNumberProperty,\n  NumberInput\n} from '@angular/cdk/coercion';\nimport {\n  AfterContentChecked,\n  AfterContentInit,\n  ChangeDetectionStrategy,\n  ChangeDetectorRef,\n  Component,\n  ContentChildren,\n  Directive,\n  ElementRef,\n  EventEmitter,\n  Inject,\n  Input,\n  OnDestroy,\n  Optional,\n  Output,\n  QueryList,\n  ViewChild,\n  ViewEncapsulation,\n} from '@angular/core';\nimport {FocusOrigin} from '@angular/cdk/a11y';\nimport {\n  CanColor,\n  CanDisableRipple,\n  mixinColor,\n  mixinDisableRipple,\n  ThemePalette,\n} from '@angular/material/core';\nimport {ANIMATION_MODULE_TYPE} from '@angular/platform-browser/animations';\nimport {merge, Subscription} from 'rxjs';\nimport {startWith} from 'rxjs/operators';\nimport {MAT_TAB_GROUP, MatTab} from './tab';\nimport {MAT_TABS_CONFIG, MatTabsConfig} from './tab-config';\n\n\n/** Used to generate unique ID's for each tab component */\nlet nextId = 0;\n\n/** A simple change event emitted on focus or selection changes. */\nexport class MatTabChangeEvent {\n  /** Index of the currently-selected tab. */\n  index: number;\n  /** Reference to the currently-selected tab. */\n  tab: MatTab;\n}\n\n/** Possible positions for the tab header. */\nexport type MatTabHeaderPosition = 'above' | 'below';\n\n// Boilerplate for applying mixins to MatTabGroup.\n/** @docs-private */\nconst _MatTabGroupMixinBase = mixinColor(mixinDisableRipple(class {\n  constructor(public _elementRef: ElementRef) {}\n}), 'primary');\n\ninterface MatTabGroupBaseHeader {\n  _alignInkBarToSelectedTab: () => void;\n  focusIndex: number;\n}\n\n/**\n * Base class with all of the `MatTabGroupBase` functionality.\n * @docs-private\n */\n@Directive()\nexport abstract class _MatTabGroupBase extends _MatTabGroupMixinBase implements AfterContentInit,\n    AfterContentChecked, OnDestroy, CanColor, CanDisableRipple {\n\n  /**\n   * All tabs inside the tab group. This includes tabs that belong to groups that are nested\n   * inside the current one. We filter out only the tabs that belong to this group in `_tabs`.\n   */\n  abstract _allTabs: QueryList<MatTab>;\n  abstract _tabBodyWrapper: ElementRef;\n  abstract _tabHeader: MatTabGroupBaseHeader;\n\n  /** All of the tabs that belong to the group. */\n  _tabs: QueryList<MatTab> = new QueryList<MatTab>();\n\n  /** The tab index that should be selected after the content has been checked. */\n  private _indexToSelect: number | null = 0;\n\n  /** Snapshot of the height of the tab body wrapper before another tab is activated. */\n  private _tabBodyWrapperHeight: number = 0;\n\n  /** Subscription to tabs being added/removed. */\n  private _tabsSubscription = Subscription.EMPTY;\n\n  /** Subscription to changes in the tab labels. */\n  private _tabLabelSubscription = Subscription.EMPTY;\n\n  /** Whether the tab group should grow to the size of the active tab. */\n  @Input()\n  get dynamicHeight(): boolean { return this._dynamicHeight; }\n  set dynamicHeight(value: boolean) { this._dynamicHeight = coerceBooleanProperty(value); }\n  private _dynamicHeight: boolean;\n\n  /** The index of the active tab. */\n  @Input()\n  get selectedIndex(): number | null { return this._selectedIndex; }\n  set selectedIndex(value: number | null) {\n    this._indexToSelect = coerceNumberProperty(value, null);\n  }\n  private _selectedIndex: number | null = null;\n\n  /** Position of the tab header. */\n  @Input() headerPosition: MatTabHeaderPosition = 'above';\n\n  /** Duration for the tab animation. Will be normalized to milliseconds if no units are set. */\n  @Input()\n  get animationDuration(): string { return this._animationDuration; }\n  set animationDuration(value: string) {\n    this._animationDuration = /^\\d+$/.test(value) ? value + 'ms' : value;\n  }\n  private _animationDuration: string;\n\n  /**\n   * `tabindex` to be set on the inner element that wraps the tab content. Can be used for improved\n   * accessibility when the tab does not have focusable elements or if it has scrollable content.\n   * The `tabindex` will be removed automatically for inactive tabs.\n   * Read more at https://www.w3.org/TR/wai-aria-practices/examples/tabs/tabs-2/tabs.html\n   */\n  @Input()\n  get contentTabIndex(): number | null { return this._contentTabIndex; }\n  set contentTabIndex(value: number | null) {\n    this._contentTabIndex = coerceNumberProperty(value, null);\n  }\n  private _contentTabIndex: number | null;\n\n  /**\n   * Whether pagination should be disabled. This can be used to avoid unnecessary\n   * layout recalculations if it's known that pagination won't be required.\n   */\n  @Input()\n  disablePagination: boolean;\n\n  /** Background color of the tab group. */\n  @Input()\n  get backgroundColor(): ThemePalette { return this._backgroundColor; }\n  set backgroundColor(value: ThemePalette) {\n    const nativeElement: HTMLElement = this._elementRef.nativeElement;\n\n    nativeElement.classList.remove(`mat-background-${this.backgroundColor}`);\n\n    if (value) {\n      nativeElement.classList.add(`mat-background-${value}`);\n    }\n\n    this._backgroundColor = value;\n  }\n  private _backgroundColor: ThemePalette;\n\n  /** Output to enable support for two-way binding on `[(selectedIndex)]` */\n  @Output() readonly selectedIndexChange: EventEmitter<number> = new EventEmitter<number>();\n\n  /** Event emitted when focus has changed within a tab group. */\n  @Output() readonly focusChange: EventEmitter<MatTabChangeEvent> =\n      new EventEmitter<MatTabChangeEvent>();\n\n  /** Event emitted when the body animation has completed */\n  @Output() readonly animationDone: EventEmitter<void> = new EventEmitter<void>();\n\n  /** Event emitted when the tab selection has changed. */\n  @Output() readonly selectedTabChange: EventEmitter<MatTabChangeEvent> =\n      new EventEmitter<MatTabChangeEvent>(true);\n\n  private _groupId: number;\n\n  constructor(elementRef: ElementRef,\n              protected _changeDetectorRef: ChangeDetectorRef,\n              @Inject(MAT_TABS_CONFIG) @Optional() defaultConfig?: MatTabsConfig,\n              @Optional() @Inject(ANIMATION_MODULE_TYPE) public _animationMode?: string) {\n    super(elementRef);\n    this._groupId = nextId++;\n    this.animationDuration = defaultConfig && defaultConfig.animationDuration ?\n        defaultConfig.animationDuration : '500ms';\n    this.disablePagination = defaultConfig && defaultConfig.disablePagination != null ?\n        defaultConfig.disablePagination : false;\n    this.dynamicHeight = defaultConfig && defaultConfig.dynamicHeight != null ?\n        defaultConfig.dynamicHeight : false;\n    this.contentTabIndex = defaultConfig?.contentTabIndex ?? null;\n  }\n\n  /**\n   * After the content is checked, this component knows what tabs have been defined\n   * and what the selected index should be. This is where we can know exactly what position\n   * each tab should be in according to the new selected index, and additionally we know how\n   * a new selected tab should transition in (from the left or right).\n   */\n  ngAfterContentChecked() {\n    // Don't clamp the `indexToSelect` immediately in the setter because it can happen that\n    // the amount of tabs changes before the actual change detection runs.\n    const indexToSelect = this._indexToSelect = this._clampTabIndex(this._indexToSelect);\n\n    // If there is a change in selected index, emit a change event. Should not trigger if\n    // the selected index has not yet been initialized.\n    if (this._selectedIndex != indexToSelect) {\n      const isFirstRun = this._selectedIndex == null;\n\n      if (!isFirstRun) {\n        this.selectedTabChange.emit(this._createChangeEvent(indexToSelect));\n        // Preserve the height so page doesn't scroll up during tab change.\n        // Fixes https://stackblitz.com/edit/mat-tabs-scroll-page-top-on-tab-change\n        const wrapper = this._tabBodyWrapper.nativeElement;\n        wrapper.style.minHeight = wrapper.clientHeight + 'px';\n      }\n\n      // Changing these values after change detection has run\n      // since the checked content may contain references to them.\n      Promise.resolve().then(() => {\n        this._tabs.forEach((tab, index) => tab.isActive = index === indexToSelect);\n\n        if (!isFirstRun) {\n          this.selectedIndexChange.emit(indexToSelect);\n          // Clear the min-height, this was needed during tab change to avoid\n          // unnecessary scrolling.\n          this._tabBodyWrapper.nativeElement.style.minHeight = '';\n        }\n      });\n    }\n\n    // Setup the position for each tab and optionally setup an origin on the next selected tab.\n    this._tabs.forEach((tab: MatTab, index: number) => {\n      tab.position = index - indexToSelect;\n\n      // If there is already a selected tab, then set up an origin for the next selected tab\n      // if it doesn't have one already.\n      if (this._selectedIndex != null && tab.position == 0 && !tab.origin) {\n        tab.origin = indexToSelect - this._selectedIndex;\n      }\n    });\n\n    if (this._selectedIndex !== indexToSelect) {\n      this._selectedIndex = indexToSelect;\n      this._changeDetectorRef.markForCheck();\n    }\n  }\n\n  ngAfterContentInit() {\n    this._subscribeToAllTabChanges();\n    this._subscribeToTabLabels();\n\n    // Subscribe to changes in the amount of tabs, in order to be\n    // able to re-render the content as new tabs are added or removed.\n    this._tabsSubscription = this._tabs.changes.subscribe(() => {\n      const indexToSelect = this._clampTabIndex(this._indexToSelect);\n\n      // Maintain the previously-selected tab if a new tab is added or removed and there is no\n      // explicit change that selects a different tab.\n      if (indexToSelect === this._selectedIndex) {\n        const tabs = this._tabs.toArray();\n\n        for (let i = 0; i < tabs.length; i++) {\n          if (tabs[i].isActive) {\n            // Assign both to the `_indexToSelect` and `_selectedIndex` so we don't fire a changed\n            // event, otherwise the consumer may end up in an infinite loop in some edge cases like\n            // adding a tab within the `selectedIndexChange` event.\n            this._indexToSelect = this._selectedIndex = i;\n            break;\n          }\n        }\n      }\n\n      this._changeDetectorRef.markForCheck();\n    });\n  }\n\n  /** Listens to changes in all of the tabs. */\n  private _subscribeToAllTabChanges() {\n    // Since we use a query with `descendants: true` to pick up the tabs, we may end up catching\n    // some that are inside of nested tab groups. We filter them out manually by checking that\n    // the closest group to the tab is the current one.\n    this._allTabs.changes\n      .pipe(startWith(this._allTabs))\n      .subscribe((tabs: QueryList<MatTab>) => {\n        this._tabs.reset(tabs.filter(tab => {\n          return tab._closestTabGroup === this || !tab._closestTabGroup;\n        }));\n        this._tabs.notifyOnChanges();\n      });\n  }\n\n  ngOnDestroy() {\n    this._tabs.destroy();\n    this._tabsSubscription.unsubscribe();\n    this._tabLabelSubscription.unsubscribe();\n  }\n\n  /** Re-aligns the ink bar to the selected tab element. */\n  realignInkBar() {\n    if (this._tabHeader) {\n      this._tabHeader._alignInkBarToSelectedTab();\n    }\n  }\n\n  /**\n   * Sets focus to a particular tab.\n   * @param index Index of the tab to be focused.\n   */\n  focusTab(index: number) {\n    const header = this._tabHeader;\n\n    if (header) {\n      header.focusIndex = index;\n    }\n  }\n\n  _focusChanged(index: number) {\n    this.focusChange.emit(this._createChangeEvent(index));\n  }\n\n  private _createChangeEvent(index: number): MatTabChangeEvent {\n    const event = new MatTabChangeEvent;\n    event.index = index;\n    if (this._tabs && this._tabs.length) {\n      event.tab = this._tabs.toArray()[index];\n    }\n    return event;\n  }\n\n  /**\n   * Subscribes to changes in the tab labels. This is needed, because the @Input for the label is\n   * on the MatTab component, whereas the data binding is inside the MatTabGroup. In order for the\n   * binding to be updated, we need to subscribe to changes in it and trigger change detection\n   * manually.\n   */\n  private _subscribeToTabLabels() {\n    if (this._tabLabelSubscription) {\n      this._tabLabelSubscription.unsubscribe();\n    }\n\n    this._tabLabelSubscription = merge(...this._tabs.map(tab => tab._stateChanges))\n      .subscribe(() => this._changeDetectorRef.markForCheck());\n  }\n\n  /** Clamps the given index to the bounds of 0 and the tabs length. */\n  private _clampTabIndex(index: number | null): number {\n    // Note the `|| 0`, which ensures that values like NaN can't get through\n    // and which would otherwise throw the component into an infinite loop\n    // (since Math.max(NaN, 0) === NaN).\n    return Math.min(this._tabs.length - 1, Math.max(index || 0, 0));\n  }\n\n  /** Returns a unique id for each tab label element */\n  _getTabLabelId(i: number): string {\n    return `mat-tab-label-${this._groupId}-${i}`;\n  }\n\n  /** Returns a unique id for each tab content element */\n  _getTabContentId(i: number): string {\n    return `mat-tab-content-${this._groupId}-${i}`;\n  }\n\n  /**\n   * Sets the height of the body wrapper to the height of the activating tab if dynamic\n   * height property is true.\n   */\n  _setTabBodyWrapperHeight(tabHeight: number): void {\n    if (!this._dynamicHeight || !this._tabBodyWrapperHeight) { return; }\n\n    const wrapper: HTMLElement = this._tabBodyWrapper.nativeElement;\n\n    wrapper.style.height = this._tabBodyWrapperHeight + 'px';\n\n    // This conditional forces the browser to paint the height so that\n    // the animation to the new height can have an origin.\n    if (this._tabBodyWrapper.nativeElement.offsetHeight) {\n      wrapper.style.height = tabHeight + 'px';\n    }\n  }\n\n  /** Removes the height of the tab body wrapper. */\n  _removeTabBodyWrapperHeight(): void {\n    const wrapper = this._tabBodyWrapper.nativeElement;\n    this._tabBodyWrapperHeight = wrapper.clientHeight;\n    wrapper.style.height = '';\n    this.animationDone.emit();\n  }\n\n  /** Handle click events, setting new selected index if appropriate. */\n  _handleClick(tab: MatTab, tabHeader: MatTabGroupBaseHeader, index: number) {\n    if (!tab.disabled) {\n      this.selectedIndex = tabHeader.focusIndex = index;\n    }\n  }\n\n  /** Retrieves the tabindex for the tab. */\n  _getTabIndex(tab: MatTab, idx: number): number | null {\n    if (tab.disabled) {\n      return null;\n    }\n    return this.selectedIndex === idx ? 0 : -1;\n  }\n\n  /** Callback for when the focused state of a tab has changed. */\n  _tabFocusChanged(focusOrigin: FocusOrigin, index: number) {\n    // Mouse/touch focus happens during the `mousedown`/`touchstart` phase which\n    // can cause the tab to be moved out from under the pointer, interrupting the\n    // click sequence (see #21898). We don't need to scroll the tab into view for\n    // such cases anyway, because it will be done when the tab becomes selected.\n    if (focusOrigin && focusOrigin !== 'mouse' && focusOrigin !== 'touch') {\n      this._tabHeader.focusIndex = index;\n    }\n  }\n\n  static ngAcceptInputType_dynamicHeight: BooleanInput;\n  static ngAcceptInputType_animationDuration: NumberInput;\n  static ngAcceptInputType_selectedIndex: NumberInput;\n  static ngAcceptInputType_disableRipple: BooleanInput;\n  static ngAcceptInputType_contentTabIndex: NumberInput;\n}\n\n/**\n * Material design tab-group component. Supports basic tab pairs (label + content) and includes\n * animated ink-bar, keyboard navigation, and screen reader.\n * See: https://material.io/design/components/tabs.html\n */\n@Component({\n  selector: 'mat-tab-group',\n  exportAs: 'matTabGroup',\n  templateUrl: 'tab-group.html',\n  styleUrls: ['tab-group.css'],\n  encapsulation: ViewEncapsulation.None,\n  // tslint:disable-next-line:validate-decorators\n  changeDetection: ChangeDetectionStrategy.Default,\n  inputs: ['color', 'disableRipple'],\n  providers: [{\n    provide: MAT_TAB_GROUP,\n    useExisting: MatTabGroup\n  }],\n  host: {\n    'class': 'mat-tab-group',\n    '[class.mat-tab-group-dynamic-height]': 'dynamicHeight',\n    '[class.mat-tab-group-inverted-header]': 'headerPosition === \"below\"',\n  },\n})\nexport class MatTabGroup extends _MatTabGroupBase {\n  @ContentChildren(MatTab, {descendants: true}) _allTabs: QueryList<MatTab>;\n  @ViewChild('tabBodyWrapper') _tabBodyWrapper: ElementRef;\n  @ViewChild('tabHeader') _tabHeader: MatTabGroupBaseHeader;\n\n  constructor(elementRef: ElementRef,\n              changeDetectorRef: ChangeDetectorRef,\n              @Inject(MAT_TABS_CONFIG) @Optional() defaultConfig?: MatTabsConfig,\n              @Optional() @Inject(ANIMATION_MODULE_TYPE) animationMode?: string) {\n    super(elementRef, changeDetectorRef, defaultConfig, animationMode);\n  }\n}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {BooleanInput} from '@angular/cdk/coercion';\nimport {Directive, ElementRef} from '@angular/core';\nimport {CanDisable, mixinDisabled} from '@angular/material/core';\n\n\n// Boilerplate for applying mixins to MatTabLabelWrapper.\n/** @docs-private */\nconst _MatTabLabelWrapperBase = mixinDisabled(class {});\n\n/**\n * Used in the `mat-tab-group` view to display tab labels.\n * @docs-private\n */\n@Directive({\n  selector: '[matTabLabelWrapper]',\n  inputs: ['disabled'],\n  host: {\n    '[class.mat-tab-disabled]': 'disabled',\n    '[attr.aria-disabled]': '!!disabled',\n  }\n})\nexport class MatTabLabelWrapper extends _MatTabLabelWrapperBase implements CanDisable {\n  constructor(public elementRef: ElementRef) {\n    super();\n  }\n\n  /** Sets focus on the wrapper element */\n  focus(): void {\n    this.elementRef.nativeElement.focus();\n  }\n\n  getOffsetLeft(): number {\n    return this.elementRef.nativeElement.offsetLeft;\n  }\n\n  getOffsetWidth(): number {\n    return this.elementRef.nativeElement.offsetWidth;\n  }\n\n  static ngAcceptInputType_disabled: BooleanInput;\n}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {\n  ChangeDetectorRef,\n  ElementRef,\n  NgZone,\n  Optional,\n  QueryList,\n  EventEmitter,\n  AfterContentChecked,\n  AfterContentInit,\n  AfterViewInit,\n  OnDestroy,\n  Directive,\n  Inject,\n  Input,\n} from '@angular/core';\nimport {Direction, Directionality} from '@angular/cdk/bidi';\nimport {coerceNumberProperty, NumberInput} from '@angular/cdk/coercion';\nimport {ViewportRuler} from '@angular/cdk/scrolling';\nimport {FocusKeyManager, FocusableOption} from '@angular/cdk/a11y';\nimport {ENTER, SPACE, hasModifierKey} from '@angular/cdk/keycodes';\nimport {merge, of as observableOf, Subject, timer, fromEvent} from 'rxjs';\nimport {takeUntil} from 'rxjs/operators';\nimport {Platform, normalizePassiveListenerOptions} from '@angular/cdk/platform';\nimport {ANIMATION_MODULE_TYPE} from '@angular/platform-browser/animations';\n\n\n/** Config used to bind passive event listeners */\nconst passiveEventListenerOptions =\n    normalizePassiveListenerOptions({passive: true}) as EventListenerOptions;\n\n/**\n * The directions that scrolling can go in when the header's tabs exceed the header width. 'After'\n * will scroll the header towards the end of the tabs list and 'before' will scroll towards the\n * beginning of the list.\n */\nexport type ScrollDirection = 'after' | 'before';\n\n/**\n * The distance in pixels that will be overshot when scrolling a tab label into view. This helps\n * provide a small affordance to the label next to it.\n */\nconst EXAGGERATED_OVERSCROLL = 60;\n\n/**\n * Amount of milliseconds to wait before starting to scroll the header automatically.\n * Set a little conservatively in order to handle fake events dispatched on touch devices.\n */\nconst HEADER_SCROLL_DELAY = 650;\n\n/**\n * Interval in milliseconds at which to scroll the header\n * while the user is holding their pointer.\n */\nconst HEADER_SCROLL_INTERVAL = 100;\n\n/** Item inside a paginated tab header. */\nexport type MatPaginatedTabHeaderItem = FocusableOption & {elementRef: ElementRef};\n\n/**\n * Base class for a tab header that supported pagination.\n * @docs-private\n */\n@Directive()\nexport abstract class MatPaginatedTabHeader implements AfterContentChecked, AfterContentInit,\n  AfterViewInit, OnDestroy {\n  abstract _items: QueryList<MatPaginatedTabHeaderItem>;\n  abstract _inkBar: {hide: () => void, alignToElement: (element: HTMLElement) => void};\n  abstract _tabListContainer: ElementRef<HTMLElement>;\n  abstract _tabList: ElementRef<HTMLElement>;\n  abstract _nextPaginator: ElementRef<HTMLElement>;\n  abstract _previousPaginator: ElementRef<HTMLElement>;\n\n  /** The distance in pixels that the tab labels should be translated to the left. */\n  private _scrollDistance = 0;\n\n  /** Whether the header should scroll to the selected index after the view has been checked. */\n  private _selectedIndexChanged = false;\n\n  /** Emits when the component is destroyed. */\n  protected readonly _destroyed = new Subject<void>();\n\n  /** Whether the controls for pagination should be displayed */\n  _showPaginationControls = false;\n\n  /** Whether the tab list can be scrolled more towards the end of the tab label list. */\n  _disableScrollAfter = true;\n\n  /** Whether the tab list can be scrolled more towards the beginning of the tab label list. */\n  _disableScrollBefore = true;\n\n  /**\n   * The number of tab labels that are displayed on the header. When this changes, the header\n   * should re-evaluate the scroll position.\n   */\n  private _tabLabelCount: number;\n\n  /** Whether the scroll distance has changed and should be applied after the view is checked. */\n  private _scrollDistanceChanged: boolean;\n\n  /** Used to manage focus between the tabs. */\n  private _keyManager: FocusKeyManager<MatPaginatedTabHeaderItem>;\n\n  /** Cached text content of the header. */\n  private _currentTextContent: string;\n\n  /** Stream that will stop the automated scrolling. */\n  private _stopScrolling = new Subject<void>();\n\n  /**\n   * Whether pagination should be disabled. This can be used to avoid unnecessary\n   * layout recalculations if it's known that pagination won't be required.\n   */\n  @Input()\n  disablePagination: boolean = false;\n\n  /** The index of the active tab. */\n  get selectedIndex(): number { return this._selectedIndex; }\n  set selectedIndex(value: number) {\n    value = coerceNumberProperty(value);\n\n    if (this._selectedIndex != value) {\n      this._selectedIndexChanged = true;\n      this._selectedIndex = value;\n\n      if (this._keyManager) {\n        this._keyManager.updateActiveItem(value);\n      }\n    }\n  }\n  private _selectedIndex: number = 0;\n\n  /** Event emitted when the option is selected. */\n  readonly selectFocusedIndex: EventEmitter<number> = new EventEmitter<number>();\n\n  /** Event emitted when a label is focused. */\n  readonly indexFocused: EventEmitter<number> = new EventEmitter<number>();\n\n  constructor(protected _elementRef: ElementRef<HTMLElement>,\n              protected _changeDetectorRef: ChangeDetectorRef,\n              private _viewportRuler: ViewportRuler,\n              @Optional() private _dir: Directionality,\n              private _ngZone: NgZone,\n              private _platform: Platform,\n              @Optional() @Inject(ANIMATION_MODULE_TYPE) public _animationMode?: string) {\n\n    // Bind the `mouseleave` event on the outside since it doesn't change anything in the view.\n    _ngZone.runOutsideAngular(() => {\n      fromEvent(_elementRef.nativeElement, 'mouseleave')\n        .pipe(takeUntil(this._destroyed))\n        .subscribe(() => {\n          this._stopInterval();\n        });\n    });\n  }\n\n  /** Called when the user has selected an item via the keyboard. */\n  protected abstract _itemSelected(event: KeyboardEvent): void;\n\n  ngAfterViewInit() {\n    // We need to handle these events manually, because we want to bind passive event listeners.\n    fromEvent(this._previousPaginator.nativeElement, 'touchstart', passiveEventListenerOptions)\n      .pipe(takeUntil(this._destroyed))\n      .subscribe(() => {\n        this._handlePaginatorPress('before');\n      });\n\n    fromEvent(this._nextPaginator.nativeElement, 'touchstart', passiveEventListenerOptions)\n      .pipe(takeUntil(this._destroyed))\n      .subscribe(() => {\n        this._handlePaginatorPress('after');\n      });\n  }\n\n  ngAfterContentInit() {\n    const dirChange = this._dir ? this._dir.change : observableOf('ltr');\n    const resize = this._viewportRuler.change(150);\n    const realign = () => {\n      this.updatePagination();\n      this._alignInkBarToSelectedTab();\n    };\n\n    this._keyManager = new FocusKeyManager<MatPaginatedTabHeaderItem>(this._items)\n      .withHorizontalOrientation(this._getLayoutDirection())\n      .withHomeAndEnd()\n      .withWrap();\n\n    this._keyManager.updateActiveItem(this._selectedIndex);\n\n    // Defer the first call in order to allow for slower browsers to lay out the elements.\n    // This helps in cases where the user lands directly on a page with paginated tabs.\n    typeof requestAnimationFrame !== 'undefined' ? requestAnimationFrame(realign) : realign();\n\n    // On dir change or window resize, realign the ink bar and update the orientation of\n    // the key manager if the direction has changed.\n    merge(dirChange, resize, this._items.changes).pipe(takeUntil(this._destroyed)).subscribe(() => {\n      // We need to defer this to give the browser some time to recalculate\n      // the element dimensions. The call has to be wrapped in `NgZone.run`,\n      // because the viewport change handler runs outside of Angular.\n      this._ngZone.run(() => Promise.resolve().then(realign));\n      this._keyManager.withHorizontalOrientation(this._getLayoutDirection());\n    });\n\n    // If there is a change in the focus key manager we need to emit the `indexFocused`\n    // event in order to provide a public event that notifies about focus changes. Also we realign\n    // the tabs container by scrolling the new focused tab into the visible section.\n    this._keyManager.change.pipe(takeUntil(this._destroyed)).subscribe(newFocusIndex => {\n      this.indexFocused.emit(newFocusIndex);\n      this._setTabFocus(newFocusIndex);\n    });\n  }\n\n  ngAfterContentChecked(): void {\n    // If the number of tab labels have changed, check if scrolling should be enabled\n    if (this._tabLabelCount != this._items.length) {\n      this.updatePagination();\n      this._tabLabelCount = this._items.length;\n      this._changeDetectorRef.markForCheck();\n    }\n\n    // If the selected index has changed, scroll to the label and check if the scrolling controls\n    // should be disabled.\n    if (this._selectedIndexChanged) {\n      this._scrollToLabel(this._selectedIndex);\n      this._checkScrollingControls();\n      this._alignInkBarToSelectedTab();\n      this._selectedIndexChanged = false;\n      this._changeDetectorRef.markForCheck();\n    }\n\n    // If the scroll distance has been changed (tab selected, focused, scroll controls activated),\n    // then translate the header to reflect this.\n    if (this._scrollDistanceChanged) {\n      this._updateTabScrollPosition();\n      this._scrollDistanceChanged = false;\n      this._changeDetectorRef.markForCheck();\n    }\n  }\n\n  ngOnDestroy() {\n    this._destroyed.next();\n    this._destroyed.complete();\n    this._stopScrolling.complete();\n  }\n\n  /** Handles keyboard events on the header. */\n  _handleKeydown(event: KeyboardEvent) {\n    // We don't handle any key bindings with a modifier key.\n    if (hasModifierKey(event)) {\n      return;\n    }\n\n    switch (event.keyCode) {\n      case ENTER:\n      case SPACE:\n        if (this.focusIndex !== this.selectedIndex) {\n          this.selectFocusedIndex.emit(this.focusIndex);\n          this._itemSelected(event);\n        }\n        break;\n      default:\n        this._keyManager.onKeydown(event);\n    }\n  }\n\n  /**\n   * Callback for when the MutationObserver detects that the content has changed.\n   */\n  _onContentChanges() {\n    const textContent = this._elementRef.nativeElement.textContent;\n\n    // We need to diff the text content of the header, because the MutationObserver callback\n    // will fire even if the text content didn't change which is inefficient and is prone\n    // to infinite loops if a poorly constructed expression is passed in (see #14249).\n    if (textContent !== this._currentTextContent) {\n      this._currentTextContent = textContent || '';\n\n      // The content observer runs outside the `NgZone` by default, which\n      // means that we need to bring the callback back in ourselves.\n      this._ngZone.run(() => {\n        this.updatePagination();\n        this._alignInkBarToSelectedTab();\n        this._changeDetectorRef.markForCheck();\n      });\n    }\n  }\n\n  /**\n   * Updates the view whether pagination should be enabled or not.\n   *\n   * WARNING: Calling this method can be very costly in terms of performance. It should be called\n   * as infrequently as possible from outside of the Tabs component as it causes a reflow of the\n   * page.\n   */\n  updatePagination() {\n    this._checkPaginationEnabled();\n    this._checkScrollingControls();\n    this._updateTabScrollPosition();\n  }\n\n  /** Tracks which element has focus; used for keyboard navigation */\n  get focusIndex(): number {\n    return this._keyManager ? this._keyManager.activeItemIndex! : 0;\n  }\n\n  /** When the focus index is set, we must manually send focus to the correct label */\n  set focusIndex(value: number) {\n    if (!this._isValidIndex(value) || this.focusIndex === value || !this._keyManager) {\n      return;\n    }\n\n    this._keyManager.setActiveItem(value);\n  }\n\n  /**\n   * Determines if an index is valid.  If the tabs are not ready yet, we assume that the user is\n   * providing a valid index and return true.\n   */\n  _isValidIndex(index: number): boolean {\n    if (!this._items) { return true; }\n\n    const tab = this._items ? this._items.toArray()[index] : null;\n    return !!tab && !tab.disabled;\n  }\n\n  /**\n   * Sets focus on the HTML element for the label wrapper and scrolls it into the view if\n   * scrolling is enabled.\n   */\n  _setTabFocus(tabIndex: number) {\n    if (this._showPaginationControls) {\n      this._scrollToLabel(tabIndex);\n    }\n\n    if (this._items && this._items.length) {\n      this._items.toArray()[tabIndex].focus();\n\n      // Do not let the browser manage scrolling to focus the element, this will be handled\n      // by using translation. In LTR, the scroll left should be 0. In RTL, the scroll width\n      // should be the full width minus the offset width.\n      const containerEl = this._tabListContainer.nativeElement;\n      const dir = this._getLayoutDirection();\n\n      if (dir == 'ltr') {\n        containerEl.scrollLeft = 0;\n      } else {\n        containerEl.scrollLeft = containerEl.scrollWidth - containerEl.offsetWidth;\n      }\n    }\n  }\n\n  /** The layout direction of the containing app. */\n  _getLayoutDirection(): Direction {\n    return this._dir && this._dir.value === 'rtl' ? 'rtl' : 'ltr';\n  }\n\n  /** Performs the CSS transformation on the tab list that will cause the list to scroll. */\n  _updateTabScrollPosition() {\n    if (this.disablePagination) {\n      return;\n    }\n\n    const scrollDistance = this.scrollDistance;\n    const translateX = this._getLayoutDirection() === 'ltr' ? -scrollDistance : scrollDistance;\n\n    // Don't use `translate3d` here because we don't want to create a new layer. A new layer\n    // seems to cause flickering and overflow in Internet Explorer. For example, the ink bar\n    // and ripples will exceed the boundaries of the visible tab bar.\n    // See: https://github.com/angular/components/issues/10276\n    // We round the `transform` here, because transforms with sub-pixel precision cause some\n    // browsers to blur the content of the element.\n    this._tabList.nativeElement.style.transform = `translateX(${Math.round(translateX)}px)`;\n\n    // Setting the `transform` on IE will change the scroll offset of the parent, causing the\n    // position to be thrown off in some cases. We have to reset it ourselves to ensure that\n    // it doesn't get thrown off. Note that we scope it only to IE and Edge, because messing\n    // with the scroll position throws off Chrome 71+ in RTL mode (see #14689).\n    if (this._platform.TRIDENT || this._platform.EDGE) {\n      this._tabListContainer.nativeElement.scrollLeft = 0;\n    }\n  }\n\n  /** Sets the distance in pixels that the tab header should be transformed in the X-axis. */\n  get scrollDistance(): number { return this._scrollDistance; }\n  set scrollDistance(value: number) {\n    this._scrollTo(value);\n  }\n\n  /**\n   * Moves the tab list in the 'before' or 'after' direction (towards the beginning of the list or\n   * the end of the list, respectively). The distance to scroll is computed to be a third of the\n   * length of the tab list view window.\n   *\n   * This is an expensive call that forces a layout reflow to compute box and scroll metrics and\n   * should be called sparingly.\n   */\n  _scrollHeader(direction: ScrollDirection) {\n    const viewLength = this._tabListContainer.nativeElement.offsetWidth;\n\n    // Move the scroll distance one-third the length of the tab list's viewport.\n    const scrollAmount = (direction == 'before' ? -1 : 1) * viewLength / 3;\n\n    return this._scrollTo(this._scrollDistance + scrollAmount);\n  }\n\n  /** Handles click events on the pagination arrows. */\n  _handlePaginatorClick(direction: ScrollDirection) {\n    this._stopInterval();\n    this._scrollHeader(direction);\n  }\n\n  /**\n   * Moves the tab list such that the desired tab label (marked by index) is moved into view.\n   *\n   * This is an expensive call that forces a layout reflow to compute box and scroll metrics and\n   * should be called sparingly.\n   */\n  _scrollToLabel(labelIndex: number) {\n    if (this.disablePagination) {\n      return;\n    }\n\n    const selectedLabel = this._items ? this._items.toArray()[labelIndex] : null;\n\n    if (!selectedLabel) {\n      return;\n    }\n\n    // The view length is the visible width of the tab labels.\n    const viewLength = this._tabListContainer.nativeElement.offsetWidth;\n    const {offsetLeft, offsetWidth} = selectedLabel.elementRef.nativeElement;\n\n    let labelBeforePos: number, labelAfterPos: number;\n    if (this._getLayoutDirection() == 'ltr') {\n      labelBeforePos = offsetLeft;\n      labelAfterPos = labelBeforePos + offsetWidth;\n    } else {\n      labelAfterPos = this._tabList.nativeElement.offsetWidth - offsetLeft;\n      labelBeforePos = labelAfterPos - offsetWidth;\n    }\n\n    const beforeVisiblePos = this.scrollDistance;\n    const afterVisiblePos = this.scrollDistance + viewLength;\n\n    if (labelBeforePos < beforeVisiblePos) {\n      // Scroll header to move label to the before direction\n      this.scrollDistance -= beforeVisiblePos - labelBeforePos + EXAGGERATED_OVERSCROLL;\n    } else if (labelAfterPos > afterVisiblePos) {\n      // Scroll header to move label to the after direction\n      this.scrollDistance += labelAfterPos - afterVisiblePos + EXAGGERATED_OVERSCROLL;\n    }\n  }\n\n  /**\n   * Evaluate whether the pagination controls should be displayed. If the scroll width of the\n   * tab list is wider than the size of the header container, then the pagination controls should\n   * be shown.\n   *\n   * This is an expensive call that forces a layout reflow to compute box and scroll metrics and\n   * should be called sparingly.\n   */\n  _checkPaginationEnabled() {\n    if (this.disablePagination) {\n      this._showPaginationControls = false;\n    } else {\n      const isEnabled =\n          this._tabList.nativeElement.scrollWidth > this._elementRef.nativeElement.offsetWidth;\n\n      if (!isEnabled) {\n        this.scrollDistance = 0;\n      }\n\n      if (isEnabled !== this._showPaginationControls) {\n        this._changeDetectorRef.markForCheck();\n      }\n\n      this._showPaginationControls = isEnabled;\n    }\n  }\n\n  /**\n   * Evaluate whether the before and after controls should be enabled or disabled.\n   * If the header is at the beginning of the list (scroll distance is equal to 0) then disable the\n   * before button. If the header is at the end of the list (scroll distance is equal to the\n   * maximum distance we can scroll), then disable the after button.\n   *\n   * This is an expensive call that forces a layout reflow to compute box and scroll metrics and\n   * should be called sparingly.\n   */\n  _checkScrollingControls() {\n    if (this.disablePagination) {\n      this._disableScrollAfter = this._disableScrollBefore = true;\n    } else {\n      // Check if the pagination arrows should be activated.\n      this._disableScrollBefore = this.scrollDistance == 0;\n      this._disableScrollAfter = this.scrollDistance == this._getMaxScrollDistance();\n      this._changeDetectorRef.markForCheck();\n    }\n  }\n\n  /**\n   * Determines what is the maximum length in pixels that can be set for the scroll distance. This\n   * is equal to the difference in width between the tab list container and tab header container.\n   *\n   * This is an expensive call that forces a layout reflow to compute box and scroll metrics and\n   * should be called sparingly.\n   */\n  _getMaxScrollDistance(): number {\n    const lengthOfTabList = this._tabList.nativeElement.scrollWidth;\n    const viewLength = this._tabListContainer.nativeElement.offsetWidth;\n    return (lengthOfTabList - viewLength) || 0;\n  }\n\n  /** Tells the ink-bar to align itself to the current label wrapper */\n  _alignInkBarToSelectedTab(): void {\n    const selectedItem = this._items && this._items.length ?\n        this._items.toArray()[this.selectedIndex] : null;\n    const selectedLabelWrapper = selectedItem ? selectedItem.elementRef.nativeElement : null;\n\n    if (selectedLabelWrapper) {\n      this._inkBar.alignToElement(selectedLabelWrapper);\n    } else {\n      this._inkBar.hide();\n    }\n  }\n\n  /** Stops the currently-running paginator interval.  */\n  _stopInterval() {\n    this._stopScrolling.next();\n  }\n\n  /**\n   * Handles the user pressing down on one of the paginators.\n   * Starts scrolling the header after a certain amount of time.\n   * @param direction In which direction the paginator should be scrolled.\n   */\n  _handlePaginatorPress(direction: ScrollDirection, mouseEvent?: MouseEvent) {\n    // Don't start auto scrolling for right mouse button clicks. Note that we shouldn't have to\n    // null check the `button`, but we do it so we don't break tests that use fake events.\n    if (mouseEvent && mouseEvent.button != null && mouseEvent.button !== 0) {\n      return;\n    }\n\n    // Avoid overlapping timers.\n    this._stopInterval();\n\n    // Start a timer after the delay and keep firing based on the interval.\n    timer(HEADER_SCROLL_DELAY, HEADER_SCROLL_INTERVAL)\n      // Keep the timer going until something tells it to stop or the component is destroyed.\n      .pipe(takeUntil(merge(this._stopScrolling, this._destroyed)))\n      .subscribe(() => {\n        const {maxScrollDistance, distance} = this._scrollHeader(direction);\n\n        // Stop the timer if we've reached the start or the end.\n        if (distance === 0 || distance >= maxScrollDistance) {\n          this._stopInterval();\n        }\n      });\n  }\n\n  /**\n   * Scrolls the header to a given position.\n   * @param position Position to which to scroll.\n   * @returns Information on the current scroll distance and the maximum.\n   */\n  private _scrollTo(position: number) {\n    if (this.disablePagination) {\n      return {maxScrollDistance: 0, distance: 0};\n    }\n\n    const maxScrollDistance = this._getMaxScrollDistance();\n    this._scrollDistance = Math.max(0, Math.min(maxScrollDistance, position));\n\n    // Mark that the scroll distance has changed so that after the view is checked, the CSS\n    // transformation can move the header.\n    this._scrollDistanceChanged = true;\n    this._checkScrollingControls();\n\n    return {maxScrollDistance, distance: this._scrollDistance};\n  }\n\n  static ngAcceptInputType_selectedIndex: NumberInput;\n}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Directionality} from '@angular/cdk/bidi';\nimport {ViewportRuler} from '@angular/cdk/scrolling';\nimport {\n  AfterContentChecked,\n  AfterContentInit,\n  ChangeDetectionStrategy,\n  ChangeDetectorRef,\n  Component,\n  ContentChildren,\n  ElementRef,\n  NgZone,\n  OnDestroy,\n  Optional,\n  QueryList,\n  ViewChild,\n  ViewEncapsulation,\n  AfterViewInit,\n  Input,\n  Inject,\n  Directive,\n} from '@angular/core';\nimport {ANIMATION_MODULE_TYPE} from '@angular/platform-browser/animations';\nimport {BooleanInput, coerceBooleanProperty} from '@angular/cdk/coercion';\nimport {MatInkBar} from './ink-bar';\nimport {MatTabLabelWrapper} from './tab-label-wrapper';\nimport {Platform} from '@angular/cdk/platform';\nimport {MatPaginatedTabHeader} from './paginated-tab-header';\n\n/**\n * Base class with all of the `MatTabHeader` functionality.\n * @docs-private\n */\n@Directive()\nexport abstract class _MatTabHeaderBase extends MatPaginatedTabHeader implements\n  AfterContentChecked, AfterContentInit, AfterViewInit, OnDestroy {\n\n  /** Whether the ripple effect is disabled or not. */\n  @Input()\n  get disableRipple() { return this._disableRipple; }\n  set disableRipple(value: any) { this._disableRipple = coerceBooleanProperty(value); }\n  private _disableRipple: boolean = false;\n\n  constructor(elementRef: ElementRef,\n              changeDetectorRef: ChangeDetectorRef,\n              viewportRuler: ViewportRuler,\n              @Optional() dir: Directionality,\n              ngZone: NgZone,\n              platform: Platform,\n              @Optional() @Inject(ANIMATION_MODULE_TYPE) animationMode?: string) {\n    super(elementRef, changeDetectorRef, viewportRuler, dir, ngZone, platform, animationMode);\n  }\n\n  protected _itemSelected(event: KeyboardEvent) {\n    event.preventDefault();\n  }\n}\n\n/**\n * The header of the tab group which displays a list of all the tabs in the tab group. Includes\n * an ink bar that follows the currently selected tab. When the tabs list's width exceeds the\n * width of the header container, then arrows will be displayed to allow the user to scroll\n * left and right across the header.\n * @docs-private\n */\n@Component({\n  selector: 'mat-tab-header',\n  templateUrl: 'tab-header.html',\n  styleUrls: ['tab-header.css'],\n  inputs: ['selectedIndex'],\n  outputs: ['selectFocusedIndex', 'indexFocused'],\n  encapsulation: ViewEncapsulation.None,\n  // tslint:disable-next-line:validate-decorators\n  changeDetection: ChangeDetectionStrategy.Default,\n  host: {\n    'class': 'mat-tab-header',\n    '[class.mat-tab-header-pagination-controls-enabled]': '_showPaginationControls',\n    '[class.mat-tab-header-rtl]': \"_getLayoutDirection() == 'rtl'\",\n  },\n})\nexport class MatTabHeader extends _MatTabHeaderBase {\n  @ContentChildren(MatTabLabelWrapper, {descendants: false}) _items: QueryList<MatTabLabelWrapper>;\n  @ViewChild(MatInkBar, {static: true}) _inkBar: MatInkBar;\n  @ViewChild('tabListContainer', {static: true}) _tabListContainer: ElementRef;\n  @ViewChild('tabList', {static: true}) _tabList: ElementRef;\n  @ViewChild('nextPaginator') _nextPaginator: ElementRef<HTMLElement>;\n  @ViewChild('previousPaginator') _previousPaginator: ElementRef<HTMLElement>;\n\n  constructor(elementRef: ElementRef,\n              changeDetectorRef: ChangeDetectorRef,\n              viewportRuler: ViewportRuler,\n              @Optional() dir: Directionality,\n              ngZone: NgZone,\n              platform: Platform,\n              @Optional() @Inject(ANIMATION_MODULE_TYPE) animationMode?: string) {\n    super(elementRef, changeDetectorRef, viewportRuler, dir, ngZone, platform, animationMode);\n  }\n\n  static ngAcceptInputType_disableRipple: BooleanInput;\n}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\nimport {FocusableOption, FocusMonitor} from '@angular/cdk/a11y';\nimport {Directionality} from '@angular/cdk/bidi';\nimport {BooleanInput, coerceBooleanProperty, NumberInput} from '@angular/cdk/coercion';\nimport {Platform} from '@angular/cdk/platform';\nimport {ViewportRuler} from '@angular/cdk/scrolling';\nimport {\n  AfterContentChecked,\n  AfterContentInit,\n  AfterViewInit,\n  Attribute,\n  ChangeDetectionStrategy,\n  ChangeDetectorRef,\n  Component,\n  ContentChildren,\n  Directive,\n  ElementRef,\n  forwardRef,\n  Inject,\n  Input,\n  NgZone,\n  OnDestroy,\n  Optional,\n  QueryList,\n  ViewChild,\n  ViewEncapsulation,\n} from '@angular/core';\nimport {\n  CanDisable,\n  CanDisableRipple,\n  HasTabIndex,\n  MAT_RIPPLE_GLOBAL_OPTIONS,\n  mixinDisabled,\n  mixinDisableRipple,\n  mixinTabIndex, RippleConfig,\n  RippleGlobalOptions,\n  RippleRenderer,\n  RippleTarget,\n  ThemePalette,\n} from '@angular/material/core';\nimport {ANIMATION_MODULE_TYPE} from '@angular/platform-browser/animations';\nimport {startWith, takeUntil} from 'rxjs/operators';\nimport {MatInkBar} from '../ink-bar';\nimport {MatPaginatedTabHeader, MatPaginatedTabHeaderItem} from '../paginated-tab-header';\n\n/**\n * Base class with all of the `MatTabNav` functionality.\n * @docs-private\n */\n@Directive()\nexport abstract class _MatTabNavBase extends MatPaginatedTabHeader implements AfterContentChecked,\n  AfterContentInit, OnDestroy {\n\n  /** Query list of all tab links of the tab navigation. */\n  abstract override _items: QueryList<MatPaginatedTabHeaderItem & {active: boolean}>;\n\n  /** Background color of the tab nav. */\n  @Input()\n  get backgroundColor(): ThemePalette { return this._backgroundColor; }\n  set backgroundColor(value: ThemePalette) {\n    const classList = this._elementRef.nativeElement.classList;\n    classList.remove(`mat-background-${this.backgroundColor}`);\n\n    if (value) {\n      classList.add(`mat-background-${value}`);\n    }\n\n    this._backgroundColor = value;\n  }\n  private _backgroundColor: ThemePalette;\n\n  /** Whether the ripple effect is disabled or not. */\n  @Input()\n  get disableRipple() { return this._disableRipple; }\n  set disableRipple(value: any) { this._disableRipple = coerceBooleanProperty(value); }\n  private _disableRipple: boolean = false;\n\n  /** Theme color of the nav bar. */\n  @Input() color: ThemePalette = 'primary';\n\n  constructor(elementRef: ElementRef,\n              @Optional() dir: Directionality,\n              ngZone: NgZone,\n              changeDetectorRef: ChangeDetectorRef,\n              viewportRuler: ViewportRuler,\n              platform: Platform,\n              @Optional() @Inject(ANIMATION_MODULE_TYPE) animationMode?: string) {\n    super(elementRef, changeDetectorRef, viewportRuler, dir, ngZone, platform, animationMode);\n  }\n\n  protected _itemSelected() {\n    // noop\n  }\n\n  override ngAfterContentInit() {\n    // We need this to run before the `changes` subscription in parent to ensure that the\n    // selectedIndex is up-to-date by the time the super class starts looking for it.\n    this._items.changes.pipe(startWith(null), takeUntil(this._destroyed)).subscribe(() => {\n      this.updateActiveLink();\n    });\n\n    super.ngAfterContentInit();\n  }\n\n  /** Notifies the component that the active link has been changed. */\n  updateActiveLink() {\n    if (!this._items) {\n      return;\n    }\n\n    const items = this._items.toArray();\n\n    for (let i = 0; i < items.length; i++) {\n      if (items[i].active) {\n        this.selectedIndex = i;\n        this._changeDetectorRef.markForCheck();\n        return;\n      }\n    }\n\n    // The ink bar should hide itself if no items are active.\n    this.selectedIndex = -1;\n    this._inkBar.hide();\n  }\n}\n\n\n/**\n * Navigation component matching the styles of the tab group header.\n * Provides anchored navigation with animated ink bar.\n */\n@Component({\n  selector: '[mat-tab-nav-bar]',\n  exportAs: 'matTabNavBar, matTabNav',\n  inputs: ['color'],\n  templateUrl: 'tab-nav-bar.html',\n  styleUrls: ['tab-nav-bar.css'],\n  host: {\n    'class': 'mat-tab-nav-bar mat-tab-header',\n    '[class.mat-tab-header-pagination-controls-enabled]': '_showPaginationControls',\n    '[class.mat-tab-header-rtl]': \"_getLayoutDirection() == 'rtl'\",\n    '[class.mat-primary]': 'color !== \"warn\" && color !== \"accent\"',\n    '[class.mat-accent]': 'color === \"accent\"',\n    '[class.mat-warn]': 'color === \"warn\"',\n  },\n  encapsulation: ViewEncapsulation.None,\n  // tslint:disable-next-line:validate-decorators\n  changeDetection: ChangeDetectionStrategy.Default,\n})\nexport class MatTabNav extends _MatTabNavBase {\n  @ContentChildren(forwardRef(() => MatTabLink), {descendants: true}) _items: QueryList<MatTabLink>;\n  @ViewChild(MatInkBar, {static: true}) _inkBar: MatInkBar;\n  @ViewChild('tabListContainer', {static: true}) _tabListContainer: ElementRef;\n  @ViewChild('tabList', {static: true}) _tabList: ElementRef;\n  @ViewChild('nextPaginator') _nextPaginator: ElementRef<HTMLElement>;\n  @ViewChild('previousPaginator') _previousPaginator: ElementRef<HTMLElement>;\n\n  constructor(elementRef: ElementRef,\n    @Optional() dir: Directionality,\n    ngZone: NgZone,\n    changeDetectorRef: ChangeDetectorRef,\n    viewportRuler: ViewportRuler,\n    platform: Platform,\n    @Optional() @Inject(ANIMATION_MODULE_TYPE) animationMode?: string) {\n    super(elementRef, dir, ngZone, changeDetectorRef, viewportRuler, platform, animationMode);\n  }\n\n  static ngAcceptInputType_disableRipple: BooleanInput;\n}\n\n// Boilerplate for applying mixins to MatTabLink.\nconst _MatTabLinkMixinBase = mixinTabIndex(mixinDisableRipple(mixinDisabled(class {})));\n\n/** Base class with all of the `MatTabLink` functionality. */\n@Directive()\nexport class _MatTabLinkBase extends _MatTabLinkMixinBase implements AfterViewInit, OnDestroy,\n  CanDisable, CanDisableRipple, HasTabIndex, RippleTarget, FocusableOption {\n\n  /** Whether the tab link is active or not. */\n  protected _isActive: boolean = false;\n\n  /** Whether the link is active. */\n  @Input()\n  get active(): boolean { return this._isActive; }\n  set active(value: boolean) {\n    const newValue = coerceBooleanProperty(value);\n\n    if (newValue !== this._isActive) {\n      this._isActive = value;\n      this._tabNavBar.updateActiveLink();\n    }\n  }\n\n  /**\n   * Ripple configuration for ripples that are launched on pointer down. The ripple config\n   * is set to the global ripple options since we don't have any configurable options for\n   * the tab link ripples.\n   * @docs-private\n   */\n  rippleConfig: RippleConfig & RippleGlobalOptions;\n\n  /**\n   * Whether ripples are disabled on interaction.\n   * @docs-private\n   */\n  get rippleDisabled(): boolean {\n    return this.disabled || this.disableRipple || this._tabNavBar.disableRipple ||\n      !!this.rippleConfig.disabled;\n  }\n\n  constructor(\n      private _tabNavBar: _MatTabNavBase,\n      /** @docs-private */ public elementRef: ElementRef,\n      @Optional() @Inject(MAT_RIPPLE_GLOBAL_OPTIONS) globalRippleOptions: RippleGlobalOptions|null,\n      @Attribute('tabindex') tabIndex: string, private _focusMonitor: FocusMonitor,\n      @Optional() @Inject(ANIMATION_MODULE_TYPE) animationMode?: string) {\n    super();\n\n    this.rippleConfig = globalRippleOptions || {};\n    this.tabIndex = parseInt(tabIndex) || 0;\n\n    if (animationMode === 'NoopAnimations') {\n      this.rippleConfig.animation = {enterDuration: 0, exitDuration: 0};\n    }\n  }\n\n  /** Focuses the tab link. */\n  focus() {\n    this.elementRef.nativeElement.focus();\n  }\n\n  ngAfterViewInit() {\n    this._focusMonitor.monitor(this.elementRef);\n  }\n\n  ngOnDestroy() {\n    this._focusMonitor.stopMonitoring(this.elementRef);\n  }\n\n  _handleFocus() {\n    // Since we allow navigation through tabbing in the nav bar, we\n    // have to update the focused index whenever the link receives focus.\n    this._tabNavBar.focusIndex = this._tabNavBar._items.toArray().indexOf(this);\n  }\n\n  static ngAcceptInputType_active: BooleanInput;\n  static ngAcceptInputType_disabled: BooleanInput;\n  static ngAcceptInputType_disableRipple: BooleanInput;\n  static ngAcceptInputType_tabIndex: NumberInput;\n}\n\n\n/**\n * Link inside of a `mat-tab-nav-bar`.\n */\n@Directive({\n  selector: '[mat-tab-link], [matTabLink]',\n  exportAs: 'matTabLink',\n  inputs: ['disabled', 'disableRipple', 'tabIndex'],\n  host: {\n    'class': 'mat-tab-link mat-focus-indicator',\n    '[attr.aria-current]': 'active ? \"page\" : null',\n    '[attr.aria-disabled]': 'disabled',\n    '[attr.tabIndex]': 'tabIndex',\n    '[class.mat-tab-disabled]': 'disabled',\n    '[class.mat-tab-label-active]': 'active',\n    '(focus)': '_handleFocus()'\n  }\n})\nexport class MatTabLink extends _MatTabLinkBase implements OnDestroy {\n  /** Reference to the RippleRenderer for the tab-link. */\n  private _tabLinkRipple: RippleRenderer;\n\n  constructor(\n    tabNavBar: MatTabNav, elementRef: ElementRef, ngZone: NgZone,\n    platform: Platform,\n    @Optional() @Inject(MAT_RIPPLE_GLOBAL_OPTIONS) globalRippleOptions: RippleGlobalOptions|null,\n    @Attribute('tabindex') tabIndex: string, focusMonitor: FocusMonitor,\n    @Optional() @Inject(ANIMATION_MODULE_TYPE) animationMode?: string) {\n    super(tabNavBar, elementRef, globalRippleOptions, tabIndex, focusMonitor, animationMode);\n    this._tabLinkRipple = new RippleRenderer(this, ngZone, elementRef, platform);\n    this._tabLinkRipple.setupTriggerEvents(elementRef.nativeElement);\n  }\n\n  override ngOnDestroy() {\n    super.ngOnDestroy();\n    this._tabLinkRipple._removeTriggerEvents();\n  }\n}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {A11yModule} from '@angular/cdk/a11y';\nimport {ObserversModule} from '@angular/cdk/observers';\nimport {PortalModule} from '@angular/cdk/portal';\nimport {CommonModule} from '@angular/common';\nimport {NgModule} from '@angular/core';\nimport {MatCommonModule, MatRippleModule} from '@angular/material/core';\nimport {MatInkBar} from './ink-bar';\nimport {MatTab} from './tab';\nimport {MatTabBody, MatTabBodyPortal} from './tab-body';\nimport {MatTabContent} from './tab-content';\nimport {MatTabGroup} from './tab-group';\nimport {MatTabHeader} from './tab-header';\nimport {MatTabLabel} from './tab-label';\nimport {MatTabLabelWrapper} from './tab-label-wrapper';\nimport {MatTabLink, MatTabNav} from './tab-nav-bar/tab-nav-bar';\n\n\n@NgModule({\n  imports: [\n    CommonModule,\n    MatCommonModule,\n    PortalModule,\n    MatRippleModule,\n    ObserversModule,\n    A11yModule,\n  ],\n  // Don't export all components because some are only to be used internally.\n  exports: [\n    MatCommonModule,\n    MatTabGroup,\n    MatTabLabel,\n    MatTab,\n    MatTabNav,\n    MatTabLink,\n    MatTabContent,\n  ],\n  declarations: [\n    MatTabGroup,\n    MatTabLabel,\n    MatTab,\n    MatInkBar,\n    MatTabLabelWrapper,\n    MatTabNav,\n    MatTabLink,\n    MatTabBody,\n    MatTabBodyPortal,\n    MatTabHeader,\n    MatTabContent,\n  ],\n})\nexport class MatTabsModule {}\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nexport * from './tab-nav-bar';\n","/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nexport {MatTabsModule} from './tabs-module';\nexport * from './tab-group';\nexport {MatInkBar, _MatInkBarPositioner, _MAT_INK_BAR_POSITIONER} from './ink-bar';\nexport {\n  MatTabBody,\n  _MatTabBodyBase,\n  MatTabBodyOriginState,\n  MatTabBodyPositionState,\n  MatTabBodyPortal\n} from './tab-body';\nexport {MatTabHeader, _MatTabHeaderBase} from './tab-header';\nexport {MatTabLabelWrapper} from './tab-label-wrapper';\nexport {MatTab, MAT_TAB_GROUP} from './tab';\nexport {MatTabLabel, MAT_TAB} from './tab-label';\nexport {MatTabNav, MatTabLink, _MatTabNavBase, _MatTabLinkBase} from './tab-nav-bar/index';\nexport {MatTabContent} from './tab-content';\nexport {ScrollDirection} from './paginated-tab-header';\nexport * from './tabs-animations';\nexport {MAT_TABS_CONFIG, MatTabsConfig} from './tab-config';\n","/**\n * Generated bundle index. Do not edit.\n */\n\nexport * from './public-api';\n\nexport {_MAT_INK_BAR_POSITIONER_FACTORY as ɵangular_material_src_material_tabs_tabs_a} from './ink-bar';\nexport {MatPaginatedTabHeader as ɵangular_material_src_material_tabs_tabs_d} from './paginated-tab-header';\nexport {MAT_TAB_CONTENT as ɵangular_material_src_material_tabs_tabs_c} from './tab-content';\nexport {MAT_TAB_LABEL as ɵangular_material_src_material_tabs_tabs_b} from 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