/** * @license * Copyright Google LLC All Rights Reserved. * * Use of this source code is governed by an MIT-style license that can be * found in the LICENSE file at https://angular.io/license */ import { ChangeDetectorRef, ElementRef, NgZone, Optional, EventEmitter, Directive, Inject, Input, } from '@angular/core'; import { Directionality } from '@angular/cdk/bidi'; import { coerceNumberProperty } from '@angular/cdk/coercion'; import { ViewportRuler } from '@angular/cdk/scrolling'; import { FocusKeyManager } from '@angular/cdk/a11y'; import { ENTER, SPACE, hasModifierKey } from '@angular/cdk/keycodes'; import { merge, of as observableOf, Subject, timer, fromEvent } from 'rxjs'; import { takeUntil } from 'rxjs/operators'; import { Platform, normalizePassiveListenerOptions } from '@angular/cdk/platform'; import { ANIMATION_MODULE_TYPE } from '@angular/platform-browser/animations'; /** Config used to bind passive event listeners */ const passiveEventListenerOptions = normalizePassiveListenerOptions({ passive: true }); /** * The distance in pixels that will be overshot when scrolling a tab label into view. This helps * provide a small affordance to the label next to it. */ const EXAGGERATED_OVERSCROLL = 60; /** * Amount of milliseconds to wait before starting to scroll the header automatically. * Set a little conservatively in order to handle fake events dispatched on touch devices. */ const HEADER_SCROLL_DELAY = 650; /** * Interval in milliseconds at which to scroll the header * while the user is holding their pointer. */ const HEADER_SCROLL_INTERVAL = 100; /** * Base class for a tab header that supported pagination. * @docs-private */ export class MatPaginatedTabHeader { constructor(_elementRef, _changeDetectorRef, _viewportRuler, _dir, _ngZone, _platform, _animationMode) { this._elementRef = _elementRef; this._changeDetectorRef = _changeDetectorRef; this._viewportRuler = _viewportRuler; this._dir = _dir; this._ngZone = _ngZone; this._platform = _platform; this._animationMode = _animationMode; /** The distance in pixels that the tab labels should be translated to the left. */ this._scrollDistance = 0; /** Whether the header should scroll to the selected index after the view has been checked. */ this._selectedIndexChanged = false; /** Emits when the component is destroyed. */ this._destroyed = new Subject(); /** Whether the controls for pagination should be displayed */ this._showPaginationControls = false; /** Whether the tab list can be scrolled more towards the end of the tab label list. */ this._disableScrollAfter = true; /** Whether the tab list can be scrolled more towards the beginning of the tab label list. */ this._disableScrollBefore = true; /** Stream that will stop the automated scrolling. */ this._stopScrolling = new Subject(); /** * Whether pagination should be disabled. This can be used to avoid unnecessary * layout recalculations if it's known that pagination won't be required. */ this.disablePagination = false; this._selectedIndex = 0; /** Event emitted when the option is selected. */ this.selectFocusedIndex = new EventEmitter(); /** Event emitted when a label is focused. */ this.indexFocused = new EventEmitter(); // Bind the `mouseleave` event on the outside since it doesn't change anything in the view. _ngZone.runOutsideAngular(() => { fromEvent(_elementRef.nativeElement, 'mouseleave') .pipe(takeUntil(this._destroyed)) .subscribe(() => { this._stopInterval(); }); }); } /** The index of the active tab. */ get selectedIndex() { return this._selectedIndex; } set selectedIndex(value) { value = coerceNumberProperty(value); if (this._selectedIndex != value) { this._selectedIndexChanged = true; this._selectedIndex = value; if (this._keyManager) { this._keyManager.updateActiveItem(value); } } } ngAfterViewInit() { // We need to handle these events manually, because we want to bind passive event listeners. fromEvent(this._previousPaginator.nativeElement, 'touchstart', passiveEventListenerOptions) .pipe(takeUntil(this._destroyed)) .subscribe(() => { this._handlePaginatorPress('before'); }); fromEvent(this._nextPaginator.nativeElement, 'touchstart', passiveEventListenerOptions) .pipe(takeUntil(this._destroyed)) .subscribe(() => { this._handlePaginatorPress('after'); }); } ngAfterContentInit() { const dirChange = this._dir ? this._dir.change : observableOf('ltr'); const resize = this._viewportRuler.change(150); const realign = () => { this.updatePagination(); this._alignInkBarToSelectedTab(); }; this._keyManager = new FocusKeyManager(this._items) .withHorizontalOrientation(this._getLayoutDirection()) .withHomeAndEnd() .withWrap(); this._keyManager.updateActiveItem(this._selectedIndex); // Defer the first call in order to allow for slower browsers to lay out the elements. // This helps in cases where the user lands directly on a page with paginated tabs. typeof requestAnimationFrame !== 'undefined' ? requestAnimationFrame(realign) : realign(); // On dir change or window resize, realign the ink bar and update the orientation of // the key manager if the direction has changed. merge(dirChange, resize, this._items.changes).pipe(takeUntil(this._destroyed)).subscribe(() => { // We need to defer this to give the browser some time to recalculate // the element dimensions. The call has to be wrapped in `NgZone.run`, // because the viewport change handler runs outside of Angular. this._ngZone.run(() => Promise.resolve().then(realign)); this._keyManager.withHorizontalOrientation(this._getLayoutDirection()); }); // If there is a change in the focus key manager we need to emit the `indexFocused` // event in order to provide a public event that notifies about focus changes. Also we realign // the tabs container by scrolling the new focused tab into the visible section. this._keyManager.change.pipe(takeUntil(this._destroyed)).subscribe(newFocusIndex => { this.indexFocused.emit(newFocusIndex); this._setTabFocus(newFocusIndex); }); } ngAfterContentChecked() { // If the number of tab labels have changed, check if scrolling should be enabled if (this._tabLabelCount != this._items.length) { this.updatePagination(); this._tabLabelCount = this._items.length; this._changeDetectorRef.markForCheck(); } // If the selected index has changed, scroll to the label and check if the scrolling controls // should be disabled. if (this._selectedIndexChanged) { this._scrollToLabel(this._selectedIndex); this._checkScrollingControls(); this._alignInkBarToSelectedTab(); this._selectedIndexChanged = false; this._changeDetectorRef.markForCheck(); } // If the scroll distance has been changed (tab selected, focused, scroll controls activated), // then translate the header to reflect this. if (this._scrollDistanceChanged) { this._updateTabScrollPosition(); this._scrollDistanceChanged = false; this._changeDetectorRef.markForCheck(); } } ngOnDestroy() { this._destroyed.next(); this._destroyed.complete(); this._stopScrolling.complete(); } /** Handles keyboard events on the header. */ _handleKeydown(event) { // We don't handle any key bindings with a modifier key. if (hasModifierKey(event)) { return; } switch (event.keyCode) { case ENTER: case SPACE: if (this.focusIndex !== this.selectedIndex) { this.selectFocusedIndex.emit(this.focusIndex); this._itemSelected(event); } break; default: this._keyManager.onKeydown(event); } } /** * Callback for when the MutationObserver detects that the content has changed. */ _onContentChanges() { const textContent = this._elementRef.nativeElement.textContent; // We need to diff the text content of the header, because the MutationObserver callback // will fire even if the text content didn't change which is inefficient and is prone // to infinite loops if a poorly constructed expression is passed in (see #14249). if (textContent !== this._currentTextContent) { this._currentTextContent = textContent || ''; // The content observer runs outside the `NgZone` by default, which // means that we need to bring the callback back in ourselves. this._ngZone.run(() => { this.updatePagination(); this._alignInkBarToSelectedTab(); this._changeDetectorRef.markForCheck(); }); } } /** * Updates the view whether pagination should be enabled or not. * * WARNING: Calling this method can be very costly in terms of performance. It should be called * as infrequently as possible from outside of the Tabs component as it causes a reflow of the * page. */ updatePagination() { this._checkPaginationEnabled(); this._checkScrollingControls(); this._updateTabScrollPosition(); } /** Tracks which element has focus; used for keyboard navigation */ get focusIndex() { return this._keyManager ? this._keyManager.activeItemIndex : 0; } /** When the focus index is set, we must manually send focus to the correct label */ set focusIndex(value) { if (!this._isValidIndex(value) || this.focusIndex === value || !this._keyManager) { return; } this._keyManager.setActiveItem(value); } /** * Determines if an index is valid. If the tabs are not ready yet, we assume that the user is * providing a valid index and return true. */ _isValidIndex(index) { if (!this._items) { return true; } const tab = this._items ? this._items.toArray()[index] : null; return !!tab && !tab.disabled; } /** * Sets focus on the HTML element for the label wrapper and scrolls it into the view if * scrolling is enabled. */ _setTabFocus(tabIndex) { if (this._showPaginationControls) { this._scrollToLabel(tabIndex); } if (this._items && this._items.length) { this._items.toArray()[tabIndex].focus(); // Do not let the browser manage scrolling to focus the element, this will be handled // by using translation. In LTR, the scroll left should be 0. In RTL, the scroll width // should be the full width minus the offset width. const containerEl = this._tabListContainer.nativeElement; const dir = this._getLayoutDirection(); if (dir == 'ltr') { containerEl.scrollLeft = 0; } else { containerEl.scrollLeft = containerEl.scrollWidth - containerEl.offsetWidth; } } } /** The layout direction of the containing app. */ _getLayoutDirection() { return this._dir && this._dir.value === 'rtl' ? 'rtl' : 'ltr'; } /** Performs the CSS transformation on the tab list that will cause the list to scroll. */ _updateTabScrollPosition() { if (this.disablePagination) { return; } const scrollDistance = this.scrollDistance; const translateX = this._getLayoutDirection() === 'ltr' ? -scrollDistance : scrollDistance; // Don't use `translate3d` here because we don't want to create a new layer. A new layer // seems to cause flickering and overflow in Internet Explorer. For example, the ink bar // and ripples will exceed the boundaries of the visible tab bar. // See: https://github.com/angular/components/issues/10276 // We round the `transform` here, because transforms with sub-pixel precision cause some // browsers to blur the content of the element. this._tabList.nativeElement.style.transform = `translateX(${Math.round(translateX)}px)`; // Setting the `transform` on IE will change the scroll offset of the parent, causing the // position to be thrown off in some cases. We have to reset it ourselves to ensure that // it doesn't get thrown off. Note that we scope it only to IE and Edge, because messing // with the scroll position throws off Chrome 71+ in RTL mode (see #14689). if (this._platform.TRIDENT || this._platform.EDGE) { this._tabListContainer.nativeElement.scrollLeft = 0; } } /** Sets the distance in pixels that the tab header should be transformed in the X-axis. */ get scrollDistance() { return this._scrollDistance; } set scrollDistance(value) { this._scrollTo(value); } /** * Moves the tab list in the 'before' or 'after' direction (towards the beginning of the list or * the end of the list, respectively). The distance to scroll is computed to be a third of the * length of the tab list view window. * * This is an expensive call that forces a layout reflow to compute box and scroll metrics and * should be called sparingly. */ _scrollHeader(direction) { const viewLength = this._tabListContainer.nativeElement.offsetWidth; // Move the scroll distance one-third the length of the tab list's viewport. const scrollAmount = (direction == 'before' ? -1 : 1) * viewLength / 3; return this._scrollTo(this._scrollDistance + scrollAmount); } /** Handles click events on the pagination arrows. */ _handlePaginatorClick(direction) { this._stopInterval(); this._scrollHeader(direction); } /** * Moves the tab list such that the desired tab label (marked by index) is moved into view. * * This is an expensive call that forces a layout reflow to compute box and scroll metrics and * should be called sparingly. */ _scrollToLabel(labelIndex) { if (this.disablePagination) { return; } const selectedLabel = this._items ? this._items.toArray()[labelIndex] : null; if (!selectedLabel) { return; } // The view length is the visible width of the tab labels. const viewLength = this._tabListContainer.nativeElement.offsetWidth; const { offsetLeft, offsetWidth } = selectedLabel.elementRef.nativeElement; let labelBeforePos, labelAfterPos; if (this._getLayoutDirection() == 'ltr') { labelBeforePos = offsetLeft; labelAfterPos = labelBeforePos + offsetWidth; } else { labelAfterPos = this._tabList.nativeElement.offsetWidth - offsetLeft; labelBeforePos = labelAfterPos - offsetWidth; } const beforeVisiblePos = this.scrollDistance; const afterVisiblePos = this.scrollDistance + viewLength; if (labelBeforePos < beforeVisiblePos) { // Scroll header to move label to the before direction this.scrollDistance -= beforeVisiblePos - labelBeforePos + EXAGGERATED_OVERSCROLL; } else if (labelAfterPos > afterVisiblePos) { // Scroll header to move label to the after direction this.scrollDistance += labelAfterPos - afterVisiblePos + EXAGGERATED_OVERSCROLL; } } /** * Evaluate whether the pagination controls should be displayed. If the scroll width of the * tab list is wider than the size of the header container, then the pagination controls should * be shown. * * This is an expensive call that forces a layout reflow to compute box and scroll metrics and * should be called sparingly. */ _checkPaginationEnabled() { if (this.disablePagination) { this._showPaginationControls = false; } else { const isEnabled = this._tabList.nativeElement.scrollWidth > this._elementRef.nativeElement.offsetWidth; if (!isEnabled) { this.scrollDistance = 0; } if (isEnabled !== this._showPaginationControls) { this._changeDetectorRef.markForCheck(); } this._showPaginationControls = isEnabled; } } /** * Evaluate whether the before and after controls should be enabled or disabled. * If the header is at the beginning of the list (scroll distance is equal to 0) then disable the * before button. If the header is at the end of the list (scroll distance is equal to the * maximum distance we can scroll), then disable the after button. * * This is an expensive call that forces a layout reflow to compute box and scroll metrics and * should be called sparingly. */ _checkScrollingControls() { if (this.disablePagination) { this._disableScrollAfter = this._disableScrollBefore = true; } else { // Check if the pagination arrows should be activated. this._disableScrollBefore = this.scrollDistance == 0; this._disableScrollAfter = this.scrollDistance == this._getMaxScrollDistance(); this._changeDetectorRef.markForCheck(); } } /** * Determines what is the maximum length in pixels that can be set for the scroll distance. This * is equal to the difference in width between the tab list container and tab header container. * * This is an expensive call that forces a layout reflow to compute box and scroll metrics and * should be called sparingly. */ _getMaxScrollDistance() { const lengthOfTabList = this._tabList.nativeElement.scrollWidth; const viewLength = this._tabListContainer.nativeElement.offsetWidth; return (lengthOfTabList - viewLength) || 0; } /** Tells the ink-bar to align itself to the current label wrapper */ _alignInkBarToSelectedTab() { const selectedItem = this._items && this._items.length ? this._items.toArray()[this.selectedIndex] : null; const selectedLabelWrapper = selectedItem ? selectedItem.elementRef.nativeElement : null; if (selectedLabelWrapper) { this._inkBar.alignToElement(selectedLabelWrapper); } else { this._inkBar.hide(); } } /** Stops the currently-running paginator interval. */ _stopInterval() { this._stopScrolling.next(); } /** * Handles the user pressing down on one of the paginators. * Starts scrolling the header after a certain amount of time. * @param direction In which direction the paginator should be scrolled. */ _handlePaginatorPress(direction, mouseEvent) { // Don't start auto scrolling for right mouse button clicks. Note that we shouldn't have to // null check the `button`, but we do it so we don't break tests that use fake events. if (mouseEvent && mouseEvent.button != null && mouseEvent.button !== 0) { return; } // Avoid overlapping timers. this._stopInterval(); // Start a timer after the delay and keep firing based on the interval. timer(HEADER_SCROLL_DELAY, HEADER_SCROLL_INTERVAL) // Keep the timer going until something tells it to stop or the component is destroyed. .pipe(takeUntil(merge(this._stopScrolling, this._destroyed))) .subscribe(() => { const { maxScrollDistance, distance } = this._scrollHeader(direction); // Stop the timer if we've reached the start or the end. if (distance === 0 || distance >= maxScrollDistance) { this._stopInterval(); } }); } /** * Scrolls the header to a given position. * @param position Position to which to scroll. * @returns Information on the current scroll distance and the maximum. */ _scrollTo(position) { if (this.disablePagination) { return { maxScrollDistance: 0, distance: 0 }; } const maxScrollDistance = this._getMaxScrollDistance(); this._scrollDistance = Math.max(0, Math.min(maxScrollDistance, position)); // Mark that the scroll distance has changed so that after the view is checked, the CSS // transformation can move the header. this._scrollDistanceChanged = true; this._checkScrollingControls(); return { maxScrollDistance, distance: this._scrollDistance }; } } MatPaginatedTabHeader.decorators = [ { type: Directive } ]; MatPaginatedTabHeader.ctorParameters = () => [ { type: ElementRef }, { type: ChangeDetectorRef }, { type: ViewportRuler }, { type: Directionality, decorators: [{ type: Optional }] }, { type: NgZone }, { type: Platform }, { type: String, decorators: [{ type: Optional }, { type: Inject, args: [ANIMATION_MODULE_TYPE,] }] } ]; MatPaginatedTabHeader.propDecorators = { disablePagination: [{ type: Input }] }; //# 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* @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"]}