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@angular/material

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/**
 * @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 { ChangeDetectionStrategy, ChangeDetectorRef, Component, ContentChildren, Directive, ElementRef, EventEmitter, Inject, Input, Optional, Output, QueryList, ViewChild, ViewEncapsulation, } from '@angular/core';
import { ANIMATION_MODULE_TYPE } from '@angular/platform-browser/animations';
import { MAT_TAB_GROUP, MatTab } from './tab';
import { MatTabHeader } from './tab-header';
import { coerceBooleanProperty, coerceNumberProperty, } from '@angular/cdk/coercion';
import { mixinColor, mixinDisableRipple, } from '@angular/material/core';
import { merge, Subscription } from 'rxjs';
import { MAT_TABS_CONFIG } from './tab-config';
import { startWith } from 'rxjs/operators';
import * as i0 from "@angular/core";
import * as i1 from "@angular/common";
import * as i2 from "@angular/cdk/portal";
import * as i3 from "@angular/material/core";
import * as i4 from "@angular/cdk/a11y";
import * as i5 from "./tab-body";
import * as i6 from "./tab-label-wrapper";
import * as i7 from "./tab-header";
/** Used to generate unique ID's for each tab component */
let nextId = 0;
// Boilerplate for applying mixins to MatTabGroup.
/** @docs-private */
const _MatTabGroupMixinBase = mixinColor(mixinDisableRipple(class {
    constructor(_elementRef) {
        this._elementRef = _elementRef;
    }
}), 'primary');
/**
 * Base class with all of the `MatTabGroupBase` functionality.
 * @docs-private
 */
export class _MatTabGroupBase extends _MatTabGroupMixinBase {
    constructor(elementRef, _changeDetectorRef, defaultConfig, _animationMode) {
        super(elementRef);
        this._changeDetectorRef = _changeDetectorRef;
        this._animationMode = _animationMode;
        /** All of the tabs that belong to the group. */
        this._tabs = new QueryList();
        /** The tab index that should be selected after the content has been checked. */
        this._indexToSelect = 0;
        /** Index of the tab that was focused last. */
        this._lastFocusedTabIndex = null;
        /** Snapshot of the height of the tab body wrapper before another tab is activated. */
        this._tabBodyWrapperHeight = 0;
        /** Subscription to tabs being added/removed. */
        this._tabsSubscription = Subscription.EMPTY;
        /** Subscription to changes in the tab labels. */
        this._tabLabelSubscription = Subscription.EMPTY;
        this._dynamicHeight = false;
        this._selectedIndex = null;
        /** Position of the tab header. */
        this.headerPosition = 'above';
        this._disablePagination = false;
        this._preserveContent = false;
        /** Output to enable support for two-way binding on `[(selectedIndex)]` */
        this.selectedIndexChange = new EventEmitter();
        /** Event emitted when focus has changed within a tab group. */
        this.focusChange = new EventEmitter();
        /** Event emitted when the body animation has completed */
        this.animationDone = new EventEmitter();
        /** Event emitted when the tab selection has changed. */
        this.selectedTabChange = new EventEmitter(true);
        this._groupId = nextId++;
        this.animationDuration =
            defaultConfig && defaultConfig.animationDuration ? defaultConfig.animationDuration : '500ms';
        this.disablePagination =
            defaultConfig && defaultConfig.disablePagination != null
                ? defaultConfig.disablePagination
                : false;
        this.dynamicHeight =
            defaultConfig && defaultConfig.dynamicHeight != null ? defaultConfig.dynamicHeight : false;
        this.contentTabIndex = defaultConfig?.contentTabIndex ?? null;
        this.preserveContent = !!defaultConfig?.preserveContent;
    }
    /** Whether the tab group should grow to the size of the active tab. */
    get dynamicHeight() {
        return this._dynamicHeight;
    }
    set dynamicHeight(value) {
        this._dynamicHeight = coerceBooleanProperty(value);
    }
    /** The index of the active tab. */
    get selectedIndex() {
        return this._selectedIndex;
    }
    set selectedIndex(value) {
        this._indexToSelect = coerceNumberProperty(value, null);
    }
    /** Duration for the tab animation. Will be normalized to milliseconds if no units are set. */
    get animationDuration() {
        return this._animationDuration;
    }
    set animationDuration(value) {
        this._animationDuration = /^\d+$/.test(value + '') ? value + 'ms' : value;
    }
    /**
     * `tabindex` to be set on the inner element that wraps the tab content. Can be used for improved
     * accessibility when the tab does not have focusable elements or if it has scrollable content.
     * The `tabindex` will be removed automatically for inactive tabs.
     * Read more at https://www.w3.org/TR/wai-aria-practices/examples/tabs/tabs-2/tabs.html
     */
    get contentTabIndex() {
        return this._contentTabIndex;
    }
    set contentTabIndex(value) {
        this._contentTabIndex = coerceNumberProperty(value, null);
    }
    /**
     * Whether pagination should be disabled. This can be used to avoid unnecessary
     * layout recalculations if it's known that pagination won't be required.
     */
    get disablePagination() {
        return this._disablePagination;
    }
    set disablePagination(value) {
        this._disablePagination = coerceBooleanProperty(value);
    }
    /**
     * By default tabs remove their content from the DOM while it's off-screen.
     * Setting this to `true` will keep it in the DOM which will prevent elements
     * like iframes and videos from reloading next time it comes back into the view.
     */
    get preserveContent() {
        return this._preserveContent;
    }
    set preserveContent(value) {
        this._preserveContent = coerceBooleanProperty(value);
    }
    /** Background color of the tab group. */
    get backgroundColor() {
        return this._backgroundColor;
    }
    set backgroundColor(value) {
        const nativeElement = this._elementRef.nativeElement;
        nativeElement.classList.remove(`mat-background-${this.backgroundColor}`);
        if (value) {
            nativeElement.classList.add(`mat-background-${value}`);
        }
        this._backgroundColor = value;
    }
    /**
     * After the content is checked, this component knows what tabs have been defined
     * and what the selected index should be. This is where we can know exactly what position
     * each tab should be in according to the new selected index, and additionally we know how
     * a new selected tab should transition in (from the left or right).
     */
    ngAfterContentChecked() {
        // Don't clamp the `indexToSelect` immediately in the setter because it can happen that
        // the amount of tabs changes before the actual change detection runs.
        const indexToSelect = (this._indexToSelect = this._clampTabIndex(this._indexToSelect));
        // If there is a change in selected index, emit a change event. Should not trigger if
        // the selected index has not yet been initialized.
        if (this._selectedIndex != indexToSelect) {
            const isFirstRun = this._selectedIndex == null;
            if (!isFirstRun) {
                this.selectedTabChange.emit(this._createChangeEvent(indexToSelect));
                // Preserve the height so page doesn't scroll up during tab change.
                // Fixes https://stackblitz.com/edit/mat-tabs-scroll-page-top-on-tab-change
                const wrapper = this._tabBodyWrapper.nativeElement;
                wrapper.style.minHeight = wrapper.clientHeight + 'px';
            }
            // Changing these values after change detection has run
            // since the checked content may contain references to them.
            Promise.resolve().then(() => {
                this._tabs.forEach((tab, index) => (tab.isActive = index === indexToSelect));
                if (!isFirstRun) {
                    this.selectedIndexChange.emit(indexToSelect);
                    // Clear the min-height, this was needed during tab change to avoid
                    // unnecessary scrolling.
                    this._tabBodyWrapper.nativeElement.style.minHeight = '';
                }
            });
        }
        // Setup the position for each tab and optionally setup an origin on the next selected tab.
        this._tabs.forEach((tab, index) => {
            tab.position = index - indexToSelect;
            // If there is already a selected tab, then set up an origin for the next selected tab
            // if it doesn't have one already.
            if (this._selectedIndex != null && tab.position == 0 && !tab.origin) {
                tab.origin = indexToSelect - this._selectedIndex;
            }
        });
        if (this._selectedIndex !== indexToSelect) {
            this._selectedIndex = indexToSelect;
            this._lastFocusedTabIndex = null;
            this._changeDetectorRef.markForCheck();
        }
    }
    ngAfterContentInit() {
        this._subscribeToAllTabChanges();
        this._subscribeToTabLabels();
        // Subscribe to changes in the amount of tabs, in order to be
        // able to re-render the content as new tabs are added or removed.
        this._tabsSubscription = this._tabs.changes.subscribe(() => {
            const indexToSelect = this._clampTabIndex(this._indexToSelect);
            // Maintain the previously-selected tab if a new tab is added or removed and there is no
            // explicit change that selects a different tab.
            if (indexToSelect === this._selectedIndex) {
                const tabs = this._tabs.toArray();
                let selectedTab;
                for (let i = 0; i < tabs.length; i++) {
                    if (tabs[i].isActive) {
                        // Assign both to the `_indexToSelect` and `_selectedIndex` so we don't fire a changed
                        // event, otherwise the consumer may end up in an infinite loop in some edge cases like
                        // adding a tab within the `selectedIndexChange` event.
                        this._indexToSelect = this._selectedIndex = i;
                        this._lastFocusedTabIndex = null;
                        selectedTab = tabs[i];
                        break;
                    }
                }
                // If we haven't found an active tab and a tab exists at the selected index, it means
                // that the active tab was swapped out. Since this won't be picked up by the rendering
                // loop in `ngAfterContentChecked`, we need to sync it up manually.
                if (!selectedTab && tabs[indexToSelect]) {
                    Promise.resolve().then(() => {
                        tabs[indexToSelect].isActive = true;
                        this.selectedTabChange.emit(this._createChangeEvent(indexToSelect));
                    });
                }
            }
            this._changeDetectorRef.markForCheck();
        });
    }
    /** Listens to changes in all of the tabs. */
    _subscribeToAllTabChanges() {
        // Since we use a query with `descendants: true` to pick up the tabs, we may end up catching
        // some that are inside of nested tab groups. We filter them out manually by checking that
        // the closest group to the tab is the current one.
        this._allTabs.changes.pipe(startWith(this._allTabs)).subscribe((tabs) => {
            this._tabs.reset(tabs.filter(tab => {
                return tab._closestTabGroup === this || !tab._closestTabGroup;
            }));
            this._tabs.notifyOnChanges();
        });
    }
    ngOnDestroy() {
        this._tabs.destroy();
        this._tabsSubscription.unsubscribe();
        this._tabLabelSubscription.unsubscribe();
    }
    /** Re-aligns the ink bar to the selected tab element. */
    realignInkBar() {
        if (this._tabHeader) {
            this._tabHeader._alignInkBarToSelectedTab();
        }
    }
    /**
     * Recalculates the tab group's pagination dimensions.
     *
     * 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() {
        if (this._tabHeader) {
            this._tabHeader.updatePagination();
        }
    }
    /**
     * Sets focus to a particular tab.
     * @param index Index of the tab to be focused.
     */
    focusTab(index) {
        const header = this._tabHeader;
        if (header) {
            header.focusIndex = index;
        }
    }
    _focusChanged(index) {
        this._lastFocusedTabIndex = index;
        this.focusChange.emit(this._createChangeEvent(index));
    }
    _createChangeEvent(index) {
        const event = new MatTabChangeEvent();
        event.index = index;
        if (this._tabs && this._tabs.length) {
            event.tab = this._tabs.toArray()[index];
        }
        return event;
    }
    /**
     * Subscribes to changes in the tab labels. This is needed, because the @Input for the label is
     * on the MatTab component, whereas the data binding is inside the MatTabGroup. In order for the
     * binding to be updated, we need to subscribe to changes in it and trigger change detection
     * manually.
     */
    _subscribeToTabLabels() {
        if (this._tabLabelSubscription) {
            this._tabLabelSubscription.unsubscribe();
        }
        this._tabLabelSubscription = merge(...this._tabs.map(tab => tab._stateChanges)).subscribe(() => this._changeDetectorRef.markForCheck());
    }
    /** Clamps the given index to the bounds of 0 and the tabs length. */
    _clampTabIndex(index) {
        // Note the `|| 0`, which ensures that values like NaN can't get through
        // and which would otherwise throw the component into an infinite loop
        // (since Math.max(NaN, 0) === NaN).
        return Math.min(this._tabs.length - 1, Math.max(index || 0, 0));
    }
    /** Returns a unique id for each tab label element */
    _getTabLabelId(i) {
        return `mat-tab-label-${this._groupId}-${i}`;
    }
    /** Returns a unique id for each tab content element */
    _getTabContentId(i) {
        return `mat-tab-content-${this._groupId}-${i}`;
    }
    /**
     * Sets the height of the body wrapper to the height of the activating tab if dynamic
     * height property is true.
     */
    _setTabBodyWrapperHeight(tabHeight) {
        if (!this._dynamicHeight || !this._tabBodyWrapperHeight) {
            return;
        }
        const wrapper = this._tabBodyWrapper.nativeElement;
        wrapper.style.height = this._tabBodyWrapperHeight + 'px';
        // This conditional forces the browser to paint the height so that
        // the animation to the new height can have an origin.
        if (this._tabBodyWrapper.nativeElement.offsetHeight) {
            wrapper.style.height = tabHeight + 'px';
        }
    }
    /** Removes the height of the tab body wrapper. */
    _removeTabBodyWrapperHeight() {
        const wrapper = this._tabBodyWrapper.nativeElement;
        this._tabBodyWrapperHeight = wrapper.clientHeight;
        wrapper.style.height = '';
        this.animationDone.emit();
    }
    /** Handle click events, setting new selected index if appropriate. */
    _handleClick(tab, tabHeader, index) {
        if (!tab.disabled) {
            this.selectedIndex = tabHeader.focusIndex = index;
        }
    }
    /** Retrieves the tabindex for the tab. */
    _getTabIndex(tab, index) {
        if (tab.disabled) {
            return null;
        }
        const targetIndex = this._lastFocusedTabIndex ?? this.selectedIndex;
        return index === targetIndex ? 0 : -1;
    }
    /** Callback for when the focused state of a tab has changed. */
    _tabFocusChanged(focusOrigin, index) {
        // Mouse/touch focus happens during the `mousedown`/`touchstart` phase which
        // can cause the tab to be moved out from under the pointer, interrupting the
        // click sequence (see #21898). We don't need to scroll the tab into view for
        // such cases anyway, because it will be done when the tab becomes selected.
        if (focusOrigin && focusOrigin !== 'mouse' && focusOrigin !== 'touch') {
            this._tabHeader.focusIndex = index;
        }
    }
}
_MatTabGroupBase.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.0.0-rc.1", ngImport: i0, type: _MatTabGroupBase, deps: [{ token: i0.ElementRef }, { token: i0.ChangeDetectorRef }, { token: MAT_TABS_CONFIG, optional: true }, { token: ANIMATION_MODULE_TYPE, optional: true }], target: i0.ɵɵFactoryTarget.Directive });
_MatTabGroupBase.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "15.0.0-rc.1", type: _MatTabGroupBase, inputs: { dynamicHeight: "dynamicHeight", selectedIndex: "selectedIndex", headerPosition: "headerPosition", animationDuration: "animationDuration", contentTabIndex: "contentTabIndex", disablePagination: "disablePagination", preserveContent: "preserveContent", backgroundColor: "backgroundColor" }, outputs: { selectedIndexChange: "selectedIndexChange", focusChange: "focusChange", animationDone: "animationDone", selectedTabChange: "selectedTabChange" }, usesInheritance: true, ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.0.0-rc.1", ngImport: i0, type: _MatTabGroupBase, decorators: [{
            type: Directive
        }], ctorParameters: function () { return [{ type: i0.ElementRef }, { type: i0.ChangeDetectorRef }, { type: undefined, decorators: [{
                    type: Inject,
                    args: [MAT_TABS_CONFIG]
                }, {
                    type: Optional
                }] }, { type: undefined, decorators: [{
                    type: Optional
                }, {
                    type: Inject,
                    args: [ANIMATION_MODULE_TYPE]
                }] }]; }, propDecorators: { dynamicHeight: [{
                type: Input
            }], selectedIndex: [{
                type: Input
            }], headerPosition: [{
                type: Input
            }], animationDuration: [{
                type: Input
            }], contentTabIndex: [{
                type: Input
            }], disablePagination: [{
                type: Input
            }], preserveContent: [{
                type: Input
            }], backgroundColor: [{
                type: Input
            }], selectedIndexChange: [{
                type: Output
            }], focusChange: [{
                type: Output
            }], animationDone: [{
                type: Output
            }], selectedTabChange: [{
                type: Output
            }] } });
/**
 * Material design tab-group component. Supports basic tab pairs (label + content) and includes
 * animated ink-bar, keyboard navigation, and screen reader.
 * See: https://material.io/design/components/tabs.html
 */
export class MatTabGroup extends _MatTabGroupBase {
    constructor(elementRef, changeDetectorRef, defaultConfig, animationMode) {
        super(elementRef, changeDetectorRef, defaultConfig, animationMode);
        this._fitInkBarToContent = false;
        this._stretchTabs = true;
        this.fitInkBarToContent =
            defaultConfig && defaultConfig.fitInkBarToContent != null
                ? defaultConfig.fitInkBarToContent
                : false;
    }
    /** Whether the ink bar should fit its width to the size of the tab label content. */
    get fitInkBarToContent() {
        return this._fitInkBarToContent;
    }
    set fitInkBarToContent(v) {
        this._fitInkBarToContent = coerceBooleanProperty(v);
        this._changeDetectorRef.markForCheck();
    }
    /** Whether tabs should be stretched to fill the header. */
    get stretchTabs() {
        return this._stretchTabs;
    }
    set stretchTabs(v) {
        this._stretchTabs = coerceBooleanProperty(v);
    }
}
MatTabGroup.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.0.0-rc.1", ngImport: i0, type: MatTabGroup, deps: [{ token: i0.ElementRef }, { token: i0.ChangeDetectorRef }, { token: MAT_TABS_CONFIG, optional: true }, { token: ANIMATION_MODULE_TYPE, optional: true }], target: i0.ɵɵFactoryTarget.Component });
MatTabGroup.ɵcmp = i0.ɵɵngDeclareComponent({ minVersion: "14.0.0", version: "15.0.0-rc.1", type: MatTabGroup, selector: "mat-tab-group", inputs: { color: "color", disableRipple: "disableRipple", fitInkBarToContent: "fitInkBarToContent", stretchTabs: ["mat-stretch-tabs", "stretchTabs"] }, host: { properties: { "class.mat-mdc-tab-group-dynamic-height": "dynamicHeight", "class.mat-mdc-tab-group-inverted-header": "headerPosition === \"below\"", "class.mat-mdc-tab-group-stretch-tabs": "stretchTabs" }, classAttribute: "mat-mdc-tab-group" }, providers: [
        {
            provide: MAT_TAB_GROUP,
            useExisting: MatTabGroup,
        },
    ], queries: [{ propertyName: "_allTabs", predicate: MatTab, descendants: true }], viewQueries: [{ propertyName: "_tabBodyWrapper", first: true, predicate: ["tabBodyWrapper"], descendants: true }, { propertyName: "_tabHeader", first: true, predicate: ["tabHeader"], descendants: true }], exportAs: ["matTabGroup"], usesInheritance: true, ngImport: i0, template: "<mat-tab-header #tabHeader\n                [selectedIndex]=\"selectedIndex || 0\"\n                [disableRipple]=\"disableRipple\"\n                (indexFocused)=\"_focusChanged($event)\"\n                (selectFocusedIndex)=\"selectedIndex = $event\">\n\n  <div class=\"mdc-tab mat-mdc-tab mat-mdc-focus-indicator\"\n       #tabNode\n       role=\"tab\"\n       matTabLabelWrapper\n       cdkMonitorElementFocus\n       *ngFor=\"let tab of _tabs; let i = index\"\n       [id]=\"_getTabLabelId(i)\"\n       [attr.tabIndex]=\"_getTabIndex(tab, i)\"\n       [attr.aria-posinset]=\"i + 1\"\n       [attr.aria-setsize]=\"_tabs.length\"\n       [attr.aria-controls]=\"_getTabContentId(i)\"\n       [attr.aria-selected]=\"selectedIndex === i\"\n       [attr.aria-label]=\"tab.ariaLabel || null\"\n       [attr.aria-labelledby]=\"(!tab.ariaLabel && tab.ariaLabelledby) ? tab.ariaLabelledby : null\"\n       [class.mdc-tab--active]=\"selectedIndex === i\"\n       [ngClass]=\"tab.labelClass\"\n       [disabled]=\"tab.disabled\"\n       [fitInkBarToContent]=\"fitInkBarToContent\"\n       (click)=\"_handleClick(tab, tabHeader, i)\"\n       (cdkFocusChange)=\"_tabFocusChanged($event, i)\">\n    <span class=\"mdc-tab__ripple\"></span>\n\n    <!-- Needs to be a separate element, because we can't put\n         `overflow: hidden` on tab due to the ink bar. -->\n    <div\n      class=\"mat-mdc-tab-ripple\"\n      mat-ripple\n      [matRippleTrigger]=\"tabNode\"\n      [matRippleDisabled]=\"tab.disabled || disableRipple\"></div>\n\n    <span class=\"mdc-tab__content\">\n      <span class=\"mdc-tab__text-label\">\n        <!-- If there is a label template, use it. -->\n        <ng-template [ngIf]=\"tab.templateLabel\" [ngIfElse]=\"tabTextLabel\">\n          <ng-template [cdkPortalOutlet]=\"tab.templateLabel\"></ng-template>\n        </ng-template>\n\n        <!-- If there is not a label template, fall back to the text label. -->\n        <ng-template #tabTextLabel>{{tab.textLabel}}</ng-template>\n      </span>\n    </span>\n  </div>\n</mat-tab-header>\n\n<div\n  class=\"mat-mdc-tab-body-wrapper\"\n  [class._mat-animation-noopable]=\"_animationMode === 'NoopAnimations'\"\n  #tabBodyWrapper>\n  <mat-tab-body role=\"tabpanel\"\n               *ngFor=\"let tab of _tabs; let i = index\"\n               [id]=\"_getTabContentId(i)\"\n               [attr.tabindex]=\"(contentTabIndex != null && selectedIndex === i) ? contentTabIndex : null\"\n               [attr.aria-labelledby]=\"_getTabLabelId(i)\"\n               [class.mat-mdc-tab-body-active]=\"selectedIndex === i\"\n               [ngClass]=\"tab.bodyClass\"\n               [content]=\"tab.content!\"\n               [position]=\"tab.position!\"\n               [origin]=\"tab.origin\"\n               [animationDuration]=\"animationDuration\"\n               [preserveContent]=\"preserveContent\"\n               (_onCentered)=\"_removeTabBodyWrapperHeight()\"\n               (_onCentering)=\"_setTabBodyWrapperHeight($event)\">\n  </mat-tab-body>\n</div>\n", styles: [".mdc-tab{min-width:90px;padding-right:24px;padding-left:24px;display:flex;flex:1 0 auto;justify-content:center;box-sizing:border-box;margin:0;padding-top:0;padding-bottom:0;border:none;outline:none;text-align:center;white-space:nowrap;cursor:pointer;-webkit-appearance:none;z-index:1}.mdc-tab::-moz-focus-inner{padding:0;border:0}.mdc-tab[hidden]{display:none}.mdc-tab--min-width{flex:0 1 auto}.mdc-tab__content{display:flex;align-items:center;justify-content:center;height:inherit;pointer-events:none}.mdc-tab__text-label{transition:150ms color linear;display:inline-block;line-height:1;z-index:2}.mdc-tab__icon{transition:150ms color linear;z-index:2}.mdc-tab--stacked .mdc-tab__content{flex-direction:column;align-items:center;justify-content:center}.mdc-tab--stacked .mdc-tab__text-label{padding-top:6px;padding-bottom:4px}.mdc-tab--active .mdc-tab__text-label,.mdc-tab--active .mdc-tab__icon{transition-delay:100ms}.mdc-tab:not(.mdc-tab--stacked) .mdc-tab__icon+.mdc-tab__text-label{padding-left:8px;padding-right:0}[dir=rtl] .mdc-tab:not(.mdc-tab--stacked) .mdc-tab__icon+.mdc-tab__text-label,.mdc-tab:not(.mdc-tab--stacked) .mdc-tab__icon+.mdc-tab__text-label[dir=rtl]{padding-left:0;padding-right:8px}.mdc-tab-indicator .mdc-tab-indicator__content--underline{border-top-width:2px}.mdc-tab-indicator .mdc-tab-indicator__content--icon{height:34px;font-size:34px}.mdc-tab-indicator{display:flex;position:absolute;top:0;left:0;justify-content:center;width:100%;height:100%;pointer-events:none;z-index:1}.mdc-tab-indicator__content{transform-origin:left;opacity:0}.mdc-tab-indicator__content--underline{align-self:flex-end;box-sizing:border-box;width:100%;border-top-style:solid}.mdc-tab-indicator__content--icon{align-self:center;margin:0 auto}.mdc-tab-indicator--active .mdc-tab-indicator__content{opacity:1}.mdc-tab-indicator .mdc-tab-indicator__content{transition:250ms transform cubic-bezier(0.4, 0, 0.2, 1)}.mdc-tab-indicator--no-transition .mdc-tab-indicator__content{transition:none}.mdc-tab-indicator--fade .mdc-tab-indicator__content{transition:150ms opacity linear}.mdc-tab-indicator--active.mdc-tab-indicator--fade .mdc-tab-indicator__content{transition-delay:100ms}.mat-mdc-tab-ripple{position:absolute;top:0;left:0;bottom:0;right:0;pointer-events:none}.mat-mdc-tab.mdc-tab{height:48px;flex-grow:0}.mat-mdc-tab .mdc-tab__ripple::before{content:\"\";display:block;position:absolute;top:0;left:0;right:0;bottom:0;opacity:0;pointer-events:none}.mat-mdc-tab .mdc-tab__content{position:relative}.mat-mdc-tab:hover .mdc-tab__ripple::before{opacity:.04}.mat-mdc-tab.cdk-program-focused .mdc-tab__ripple::before,.mat-mdc-tab.cdk-keyboard-focused .mdc-tab__ripple::before{opacity:.12}.mat-mdc-tab .mat-ripple-element{opacity:.12}.mat-mdc-tab-group.mat-mdc-tab-group-stretch-tabs>.mat-mdc-tab-header .mat-mdc-tab{flex-grow:1}.mat-mdc-tab-disabled{opacity:.4;pointer-events:none}.mat-mdc-tab-group{display:flex;flex-direction:column;max-width:100%}.mat-mdc-tab-group.mat-mdc-tab-group-inverted-header{flex-direction:column-reverse}.mat-mdc-tab-group.mat-mdc-tab-group-inverted-header .mdc-tab-indicator__content--underline{align-self:flex-start}.mat-mdc-tab-body-wrapper{position:relative;overflow:hidden;display:flex;transition:height 500ms cubic-bezier(0.35, 0, 0.25, 1)}.mat-mdc-tab-body-wrapper._mat-animation-noopable{transition:none !important;animation:none !important}"], dependencies: [{ kind: "directive", type: i1.NgClass, selector: "[ngClass]", inputs: ["class", "ngClass"] }, { kind: "directive", type: i1.NgForOf, selector: "[ngFor][ngForOf]", inputs: ["ngForOf", "ngForTrackBy", "ngForTemplate"] }, { kind: "directive", type: i1.NgIf, selector: "[ngIf]", inputs: ["ngIf", "ngIfThen", "ngIfElse"] }, { kind: "directive", type: i2.CdkPortalOutlet, selector: "[cdkPortalOutlet]", inputs: ["cdkPortalOutlet"], outputs: ["attached"], exportAs: ["cdkPortalOutlet"] }, { kind: "directive", type: i3.MatRipple, selector: "[mat-ripple], [matRipple]", inputs: ["matRippleColor", "matRippleUnbounded", "matRippleCentered", "matRippleRadius", "matRippleAnimation", "matRippleDisabled", "matRippleTrigger"], exportAs: ["matRipple"] }, { kind: "directive", type: i4.CdkMonitorFocus, selector: "[cdkMonitorElementFocus], [cdkMonitorSubtreeFocus]", outputs: ["cdkFocusChange"], exportAs: ["cdkMonitorFocus"] }, { kind: "component", type: i5.MatTabBody, selector: "mat-tab-body" }, { kind: "directive", type: i6.MatTabLabelWrapper, selector: "[matTabLabelWrapper]", inputs: ["disabled", "fitInkBarToContent"] }, { kind: "component", type: i7.MatTabHeader, selector: "mat-tab-header", inputs: ["selectedIndex"], outputs: ["selectFocusedIndex", "indexFocused"] }], changeDetection: i0.ChangeDetectionStrategy.Default, encapsulation: i0.ViewEncapsulation.None });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.0.0-rc.1", ngImport: i0, type: MatTabGroup, decorators: [{
            type: Component,
            args: [{ selector: 'mat-tab-group', exportAs: 'matTabGroup', encapsulation: ViewEncapsulation.None, changeDetection: ChangeDetectionStrategy.Default, inputs: ['color', 'disableRipple'], providers: [
                        {
                            provide: MAT_TAB_GROUP,
                            useExisting: MatTabGroup,
                        },
                    ], host: {
                        'class': 'mat-mdc-tab-group',
                        '[class.mat-mdc-tab-group-dynamic-height]': 'dynamicHeight',
                        '[class.mat-mdc-tab-group-inverted-header]': 'headerPosition === "below"',
                        '[class.mat-mdc-tab-group-stretch-tabs]': 'stretchTabs',
                    }, template: "<mat-tab-header #tabHeader\n                [selectedIndex]=\"selectedIndex || 0\"\n                [disableRipple]=\"disableRipple\"\n                (indexFocused)=\"_focusChanged($event)\"\n                (selectFocusedIndex)=\"selectedIndex = $event\">\n\n  <div class=\"mdc-tab mat-mdc-tab mat-mdc-focus-indicator\"\n       #tabNode\n       role=\"tab\"\n       matTabLabelWrapper\n       cdkMonitorElementFocus\n       *ngFor=\"let tab of _tabs; let i = index\"\n       [id]=\"_getTabLabelId(i)\"\n       [attr.tabIndex]=\"_getTabIndex(tab, i)\"\n       [attr.aria-posinset]=\"i + 1\"\n       [attr.aria-setsize]=\"_tabs.length\"\n       [attr.aria-controls]=\"_getTabContentId(i)\"\n       [attr.aria-selected]=\"selectedIndex === i\"\n       [attr.aria-label]=\"tab.ariaLabel || null\"\n       [attr.aria-labelledby]=\"(!tab.ariaLabel && tab.ariaLabelledby) ? tab.ariaLabelledby : null\"\n       [class.mdc-tab--active]=\"selectedIndex === i\"\n       [ngClass]=\"tab.labelClass\"\n       [disabled]=\"tab.disabled\"\n       [fitInkBarToContent]=\"fitInkBarToContent\"\n       (click)=\"_handleClick(tab, tabHeader, i)\"\n       (cdkFocusChange)=\"_tabFocusChanged($event, i)\">\n    <span class=\"mdc-tab__ripple\"></span>\n\n    <!-- Needs to be a separate element, because we can't put\n         `overflow: hidden` on tab due to the ink bar. -->\n    <div\n      class=\"mat-mdc-tab-ripple\"\n      mat-ripple\n      [matRippleTrigger]=\"tabNode\"\n      [matRippleDisabled]=\"tab.disabled || disableRipple\"></div>\n\n    <span class=\"mdc-tab__content\">\n      <span class=\"mdc-tab__text-label\">\n        <!-- If there is a label template, use it. -->\n        <ng-template [ngIf]=\"tab.templateLabel\" [ngIfElse]=\"tabTextLabel\">\n          <ng-template [cdkPortalOutlet]=\"tab.templateLabel\"></ng-template>\n        </ng-template>\n\n        <!-- If there is not a label template, fall back to the text label. -->\n        <ng-template #tabTextLabel>{{tab.textLabel}}</ng-template>\n      </span>\n    </span>\n  </div>\n</mat-tab-header>\n\n<div\n  class=\"mat-mdc-tab-body-wrapper\"\n  [class._mat-animation-noopable]=\"_animationMode === 'NoopAnimations'\"\n  #tabBodyWrapper>\n  <mat-tab-body role=\"tabpanel\"\n               *ngFor=\"let tab of _tabs; let i = index\"\n               [id]=\"_getTabContentId(i)\"\n               [attr.tabindex]=\"(contentTabIndex != null && selectedIndex === i) ? contentTabIndex : null\"\n               [attr.aria-labelledby]=\"_getTabLabelId(i)\"\n               [class.mat-mdc-tab-body-active]=\"selectedIndex === i\"\n               [ngClass]=\"tab.bodyClass\"\n               [content]=\"tab.content!\"\n               [position]=\"tab.position!\"\n               [origin]=\"tab.origin\"\n               [animationDuration]=\"animationDuration\"\n               [preserveContent]=\"preserveContent\"\n               (_onCentered)=\"_removeTabBodyWrapperHeight()\"\n               (_onCentering)=\"_setTabBodyWrapperHeight($event)\">\n  </mat-tab-body>\n</div>\n", styles: [".mdc-tab{min-width:90px;padding-right:24px;padding-left:24px;display:flex;flex:1 0 auto;justify-content:center;box-sizing:border-box;margin:0;padding-top:0;padding-bottom:0;border:none;outline:none;text-align:center;white-space:nowrap;cursor:pointer;-webkit-appearance:none;z-index:1}.mdc-tab::-moz-focus-inner{padding:0;border:0}.mdc-tab[hidden]{display:none}.mdc-tab--min-width{flex:0 1 auto}.mdc-tab__content{display:flex;align-items:center;justify-content:center;height:inherit;pointer-events:none}.mdc-tab__text-label{transition:150ms color linear;display:inline-block;line-height:1;z-index:2}.mdc-tab__icon{transition:150ms color linear;z-index:2}.mdc-tab--stacked .mdc-tab__content{flex-direction:column;align-items:center;justify-content:center}.mdc-tab--stacked .mdc-tab__text-label{padding-top:6px;padding-bottom:4px}.mdc-tab--active .mdc-tab__text-label,.mdc-tab--active .mdc-tab__icon{transition-delay:100ms}.mdc-tab:not(.mdc-tab--stacked) .mdc-tab__icon+.mdc-tab__text-label{padding-left:8px;padding-right:0}[dir=rtl] .mdc-tab:not(.mdc-tab--stacked) .mdc-tab__icon+.mdc-tab__text-label,.mdc-tab:not(.mdc-tab--stacked) .mdc-tab__icon+.mdc-tab__text-label[dir=rtl]{padding-left:0;padding-right:8px}.mdc-tab-indicator .mdc-tab-indicator__content--underline{border-top-width:2px}.mdc-tab-indicator .mdc-tab-indicator__content--icon{height:34px;font-size:34px}.mdc-tab-indicator{display:flex;position:absolute;top:0;left:0;justify-content:center;width:100%;height:100%;pointer-events:none;z-index:1}.mdc-tab-indicator__content{transform-origin:left;opacity:0}.mdc-tab-indicator__content--underline{align-self:flex-end;box-sizing:border-box;width:100%;border-top-style:solid}.mdc-tab-indicator__content--icon{align-self:center;margin:0 auto}.mdc-tab-indicator--active .mdc-tab-indicator__content{opacity:1}.mdc-tab-indicator .mdc-tab-indicator__content{transition:250ms transform cubic-bezier(0.4, 0, 0.2, 1)}.mdc-tab-indicator--no-transition .mdc-tab-indicator__content{transition:none}.mdc-tab-indicator--fade .mdc-tab-indicator__content{transition:150ms opacity linear}.mdc-tab-indicator--active.mdc-tab-indicator--fade .mdc-tab-indicator__content{transition-delay:100ms}.mat-mdc-tab-ripple{position:absolute;top:0;left:0;bottom:0;right:0;pointer-events:none}.mat-mdc-tab.mdc-tab{height:48px;flex-grow:0}.mat-mdc-tab .mdc-tab__ripple::before{content:\"\";display:block;position:absolute;top:0;left:0;right:0;bottom:0;opacity:0;pointer-events:none}.mat-mdc-tab .mdc-tab__content{position:relative}.mat-mdc-tab:hover .mdc-tab__ripple::before{opacity:.04}.mat-mdc-tab.cdk-program-focused .mdc-tab__ripple::before,.mat-mdc-tab.cdk-keyboard-focused .mdc-tab__ripple::before{opacity:.12}.mat-mdc-tab .mat-ripple-element{opacity:.12}.mat-mdc-tab-group.mat-mdc-tab-group-stretch-tabs>.mat-mdc-tab-header .mat-mdc-tab{flex-grow:1}.mat-mdc-tab-disabled{opacity:.4;pointer-events:none}.mat-mdc-tab-group{display:flex;flex-direction:column;max-width:100%}.mat-mdc-tab-group.mat-mdc-tab-group-inverted-header{flex-direction:column-reverse}.mat-mdc-tab-group.mat-mdc-tab-group-inverted-header .mdc-tab-indicator__content--underline{align-self:flex-start}.mat-mdc-tab-body-wrapper{position:relative;overflow:hidden;display:flex;transition:height 500ms cubic-bezier(0.35, 0, 0.25, 1)}.mat-mdc-tab-body-wrapper._mat-animation-noopable{transition:none !important;animation:none !important}"] }]
        }], ctorParameters: function () { return [{ type: i0.ElementRef }, { type: i0.ChangeDetectorRef }, { type: undefined, decorators: [{
                    type: Inject,
                    args: [MAT_TABS_CONFIG]
                }, {
                    type: Optional
                }] }, { type: undefined, decorators: [{
                    type: Optional
                }, {
                    type: Inject,
                    args: [ANIMATION_MODULE_TYPE]
                }] }]; }, propDecorators: { _allTabs: [{
                type: ContentChildren,
                args: [MatTab, { descendants: true }]
            }], _tabBodyWrapper: [{
                type: ViewChild,
                args: ['tabBodyWrapper']
            }], _tabHeader: [{
                type: ViewChild,
                args: ['tabHeader']
            }], fitInkBarToContent: [{
                type: Input
            }], stretchTabs: [{
                type: Input,
                args: ['mat-stretch-tabs']
            }] } });
/** A simple change event emitted on focus or selection changes. */
export class MatTabChangeEvent {
}
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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  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 {ANIMATION_MODULE_TYPE} from '@angular/platform-browser/animations';\nimport {MAT_TAB_GROUP, MatTab} from './tab';\nimport {MatTabHeader} from './tab-header';\nimport {\n  BooleanInput,\n  coerceBooleanProperty,\n  coerceNumberProperty,\n  NumberInput,\n} from '@angular/cdk/coercion';\nimport {\n  CanColor,\n  CanDisableRipple,\n  mixinColor,\n  mixinDisableRipple,\n  ThemePalette,\n} from '@angular/material/core';\nimport {merge, Subscription} from 'rxjs';\nimport {MAT_TABS_CONFIG, MatTabsConfig} from './tab-config';\nimport {startWith} from 'rxjs/operators';\nimport {FocusOrigin} from '@angular/cdk/a11y';\n\n/** Used to generate unique ID's for each tab component */\nlet nextId = 0;\n\n// Boilerplate for applying mixins to MatTabGroup.\n/** @docs-private */\nconst _MatTabGroupMixinBase = mixinColor(\n  mixinDisableRipple(\n    class {\n      constructor(public _elementRef: ElementRef) {}\n    },\n  ),\n  'primary',\n);\n\n/** @docs-private */\nexport interface MatTabGroupBaseHeader {\n  _alignInkBarToSelectedTab(): void;\n  updatePagination(): void;\n  focusIndex: number;\n}\n\n/** Possible positions for the tab header. */\nexport type MatTabHeaderPosition = 'above' | 'below';\n\n/**\n * Base class with all of the `MatTabGroupBase` functionality.\n * @docs-private\n */\n@Directive()\nexport abstract class _MatTabGroupBase\n  extends _MatTabGroupMixinBase\n  implements AfterContentInit, 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  /** Index of the tab that was focused last. */\n  private _lastFocusedTabIndex: number | null = null;\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 {\n    return this._dynamicHeight;\n  }\n\n  set dynamicHeight(value: BooleanInput) {\n    this._dynamicHeight = coerceBooleanProperty(value);\n  }\n\n  private _dynamicHeight: boolean = false;\n\n  /** The index of the active tab. */\n  @Input()\n  get selectedIndex(): number | null {\n    return this._selectedIndex;\n  }\n\n  set selectedIndex(value: NumberInput) {\n    this._indexToSelect = coerceNumberProperty(value, null);\n  }\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 {\n    return this._animationDuration;\n  }\n\n  set animationDuration(value: NumberInput) {\n    this._animationDuration = /^\\d+$/.test(value + '') ? value + 'ms' : (value as string);\n  }\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 {\n    return this._contentTabIndex;\n  }\n\n  set contentTabIndex(value: NumberInput) {\n    this._contentTabIndex = coerceNumberProperty(value, null);\n  }\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  get disablePagination(): boolean {\n    return this._disablePagination;\n  }\n\n  set disablePagination(value: BooleanInput) {\n    this._disablePagination = coerceBooleanProperty(value);\n  }\n\n  private _disablePagination: boolean = false;\n\n  /**\n   * By default tabs remove their content from the DOM while it's off-screen.\n   * Setting this to `true` will keep it in the DOM which will prevent elements\n   * like iframes and videos from reloading next time it comes back into the view.\n   */\n  @Input()\n  get preserveContent(): boolean {\n    return this._preserveContent;\n  }\n\n  set preserveContent(value: BooleanInput) {\n    this._preserveContent = coerceBooleanProperty(value);\n  }\n\n  private _preserveContent: boolean = false;\n\n  /** Background color of the tab group. */\n  @Input()\n  get backgroundColor(): ThemePalette {\n    return this._backgroundColor;\n  }\n\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\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(\n    elementRef: ElementRef,\n    protected _changeDetectorRef: ChangeDetectorRef,\n    @Inject(MAT_TABS_CONFIG) @Optional() defaultConfig?: MatTabsConfig,\n    @Optional() @Inject(ANIMATION_MODULE_TYPE) public _animationMode?: string,\n  ) {\n    super(elementRef);\n    this._groupId = nextId++;\n    this.animationDuration =\n      defaultConfig && defaultConfig.animationDuration ? defaultConfig.animationDuration : '500ms';\n    this.disablePagination =\n      defaultConfig && defaultConfig.disablePagination != null\n        ? defaultConfig.disablePagination\n        : false;\n    this.dynamicHeight =\n      defaultConfig && defaultConfig.dynamicHeight != null ? defaultConfig.dynamicHeight : false;\n    this.contentTabIndex = defaultConfig?.contentTabIndex ?? null;\n    this.preserveContent = !!defaultConfig?.preserveContent;\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._lastFocusedTabIndex = null;\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        let selectedTab: MatTab | undefined;\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            this._lastFocusedTabIndex = null;\n            selectedTab = tabs[i];\n            break;\n          }\n        }\n\n        // If we haven't found an active tab and a tab exists at the selected index, it means\n        // that the active tab was swapped out. Since this won't be picked up by the rendering\n        // loop in `ngAfterContentChecked`, we need to sync it up manually.\n        if (!selectedTab && tabs[indexToSelect]) {\n          Promise.resolve().then(() => {\n            tabs[indexToSelect].isActive = true;\n            this.selectedTabChange.emit(this._createChangeEvent(indexToSelect));\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.pipe(startWith(this._allTabs)).subscribe((tabs: QueryList<MatTab>) => {\n      this._tabs.reset(\n        tabs.filter(tab => {\n          return tab._closestTabGroup === this || !tab._closestTabGroup;\n        }),\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   * Recalculates the tab group's pagination dimensions.\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    if (this._tabHeader) {\n      this._tabHeader.updatePagination();\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._lastFocusedTabIndex = index;\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)).subscribe(() =>\n      this._changeDetectorRef.markForCheck(),\n    );\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) {\n      return;\n    }\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, index: number): number | null {\n    if (tab.disabled) {\n      return null;\n    }\n    const targetIndex = this._lastFocusedTabIndex ?? this.selectedIndex;\n    return index === targetIndex ? 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\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    {\n      provide: MAT_TAB_GROUP,\n      useExisting: MatTabGroup,\n    },\n  ],\n  host: {\n    'class': 'mat-mdc-tab-group',\n    '[class.mat-mdc-tab-group-dynamic-height]': 'dynamicHeight',\n    '[class.mat-mdc-tab-group-inverted-header]': 'headerPosition === \"below\"',\n    '[class.mat-mdc-tab-group-stretch-tabs]': 'stretchTabs',\n  },\n})\nexport class MatTabGroup extends _MatTabGroupBase {\n  @ContentChildren(MatTab, {descendants: true}) _allTabs: QueryList<MatTab>;\n  @ViewChild('tabBodyWrapper') _tabBodyWrapper: ElementRef;\n  @ViewChild('tabHeader') _tabHeader: MatTabHeader;\n\n  /** Whether the ink bar should fit its width to the size of the tab label content. */\n  @Input()\n  get fitInkBarToContent(): boolean {\n    return this._fitInkBarToContent;\n  }\n  set fitInkBarToContent(v: BooleanInput) {\n    this._fitInkBarToContent = coerceBooleanProperty(v);\n    this._changeDetectorRef.markForCheck();\n  }\n  private _fitInkBarToContent = false;\n\n  /** Whether tabs should be stretched to fill the header. */\n  @Input('mat-stretch-tabs')\n  get stretchTabs(): boolean {\n    return this._stretchTabs;\n  }\n  set stretchTabs(v: BooleanInput) {\n    this._stretchTabs = coerceBooleanProperty(v);\n  }\n  private _stretchTabs = true;\n\n  constructor(\n    elementRef: ElementRef,\n    changeDetectorRef: ChangeDetectorRef,\n    @Inject(MAT_TABS_CONFIG) @Optional() defaultConfig?: MatTabsConfig,\n    @Optional() @Inject(ANIMATION_MODULE_TYPE) animationMode?: string,\n  ) {\n    super(elementRef, changeDetectorRef, defaultConfig, animationMode);\n    this.fitInkBarToContent =\n      defaultConfig && defaultConfig.fitInkBarToContent != null\n        ? defaultConfig.fitInkBarToContent\n        : false;\n  }\n}\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","<mat-tab-header #tabHeader\n                [selectedIndex]=\"selectedIndex || 0\"\n                [disableRipple]=\"disableRipple\"\n                (indexFocused)=\"_focusChanged($event)\"\n                (selectFocusedIndex)=\"selectedIndex = $event\">\n\n  <div class=\"mdc-tab mat-mdc-tab mat-mdc-focus-indicator\"\n       #tabNode\n       role=\"tab\"\n       matTabLabelWrapper\n       cdkMonitorElementFocus\n       *ngFor=\"let tab of _tabs; let i = index\"\n       [id]=\"_getTabLabelId(i)\"\n       [attr.tabIndex]=\"_getTabIndex(tab, i)\"\n       [attr.aria-posinset]=\"i + 1\"\n       [attr.aria-setsize]=\"_tabs.length\"\n       [attr.aria-controls]=\"_getTabContentId(i)\"\n       [attr.aria-selected]=\"selectedIndex === i\"\n       [attr.aria-label]=\"tab.ariaLabel || null\"\n       [attr.aria-labelledby]=\"(!tab.ariaLabel && tab.ariaLabelledby) ? tab.ariaLabelledby : null\"\n       [class.mdc-tab--active]=\"selectedIndex === i\"\n       [ngClass]=\"tab.labelClass\"\n       [disabled]=\"tab.disabled\"\n       [fitInkBarToContent]=\"fitInkBarToContent\"\n       (click)=\"_handleClick(tab, tabHeader, i)\"\n       (cdkFocusChange)=\"_tabFocusChanged($event, i)\">\n    <span class=\"mdc-tab__ripple\"></span>\n\n    <!-- Needs to be a separate element, because we can't put\n         `overflow: hidden` on tab due to the ink bar. -->\n    <div\n      class=\"mat-mdc-tab-ripple\"\n      mat-ripple\n      [matRippleTrigger]=\"tabNode\"\n      [matRippleDisabled]=\"tab.disabled || disableRipple\"></div>\n\n    <span class=\"mdc-tab__content\">\n      <span class=\"mdc-tab__text-label\">\n        <!-- If there is a label template, use it. -->\n        <ng-template [ngIf]=\"tab.templateLabel\" [ngIfElse]=\"tabTextLabel\">\n          <ng-template [cdkPortalOutlet]=\"tab.templateLabel\"></ng-template>\n        </ng-template>\n\n        <!-- If there is not a label template, fall back to the text label. -->\n        <ng-template #tabTextLabel>{{tab.textLabel}}</ng-template>\n      </span>\n    </span>\n  </div>\n</mat-tab-header>\n\n<div\n  class=\"mat-mdc-tab-body-wrapper\"\n  [class._mat-animation-noopable]=\"_animationMode === 'NoopAnimations'\"\n  #tabBodyWrapper>\n  <mat-tab-body role=\"tabpanel\"\n               *ngFor=\"let tab of _tabs; let i = index\"\n               [id]=\"_getTabContentId(i)\"\n               [attr.tabindex]=\"(contentTabIndex != null && selectedIndex === i) ? contentTabIndex : null\"\n               [attr.aria-labelledby]=\"_getTabLabelId(i)\"\n               [class.mat-mdc-tab-body-active]=\"selectedIndex === i\"\n               [ngClass]=\"tab.bodyClass\"\n               [content]=\"tab.content!\"\n               [position]=\"tab.position!\"\n               [origin]=\"tab.origin\"\n               [animationDuration]=\"animationDuration\"\n               [preserveContent]=\"preserveContent\"\n               (_onCentered)=\"_removeTabBodyWrapperHeight()\"\n               (_onCentering)=\"_setTabBodyWrapperHeight($event)\">\n  </mat-tab-body>\n</div>\n"]}