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@angular/cdk

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Angular Material Component Development Kit

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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 { FocusKeyManager } from '@angular/cdk/a11y'; import { Directionality } from '@angular/cdk/bidi'; import { coerceBooleanProperty, coerceNumberProperty } from '@angular/cdk/coercion'; import { ENTER, hasModifierKey, SPACE } from '@angular/cdk/keycodes'; import { DOCUMENT } from '@angular/common'; import { ChangeDetectionStrategy, ChangeDetectorRef, Component, ContentChild, ContentChildren, Directive, ElementRef, EventEmitter, forwardRef, Inject, InjectionToken, Input, Optional, Output, QueryList, TemplateRef, ViewChild, ViewEncapsulation, } from '@angular/core'; import { of as observableOf, Subject } from 'rxjs'; import { startWith, takeUntil } from 'rxjs/operators'; import { CdkStepHeader } from './step-header'; import { CdkStepLabel } from './step-label'; /** Used to generate unique ID for each stepper component. */ let nextId = 0; /** Change event emitted on selection changes. */ export class StepperSelectionEvent { } /** Enum to represent the different states of the steps. */ export const STEP_STATE = { NUMBER: 'number', EDIT: 'edit', DONE: 'done', ERROR: 'error' }; /** InjectionToken that can be used to specify the global stepper options. */ export const STEPPER_GLOBAL_OPTIONS = new InjectionToken('STEPPER_GLOBAL_OPTIONS'); /** * InjectionToken that can be used to specify the global stepper options. * @deprecated Use `STEPPER_GLOBAL_OPTIONS` instead. * @breaking-change 8.0.0. */ export const MAT_STEPPER_GLOBAL_OPTIONS = STEPPER_GLOBAL_OPTIONS; export class CdkStep { /** @breaking-change 8.0.0 remove the `?` after `stepperOptions` */ constructor(_stepper, stepperOptions) { this._stepper = _stepper; /** Whether user has seen the expanded step content or not. */ this.interacted = false; this._editable = true; this._optional = false; this._completedOverride = null; this._customError = null; this._stepperOptions = stepperOptions ? stepperOptions : {}; this._displayDefaultIndicatorType = this._stepperOptions.displayDefaultIndicatorType !== false; this._showError = !!this._stepperOptions.showError; } /** Whether the user can return to this step once it has been marked as completed. */ get editable() { return this._editable; } set editable(value) { this._editable = coerceBooleanProperty(value); } /** Whether the completion of step is optional. */ get optional() { return this._optional; } set optional(value) { this._optional = coerceBooleanProperty(value); } /** Whether step is marked as completed. */ get completed() { return this._completedOverride == null ? this._getDefaultCompleted() : this._completedOverride; } set completed(value) { this._completedOverride = coerceBooleanProperty(value); } _getDefaultCompleted() { return this.stepControl ? this.stepControl.valid && this.interacted : this.interacted; } /** Whether step has an error. */ get hasError() { return this._customError == null ? this._getDefaultError() : this._customError; } set hasError(value) { this._customError = coerceBooleanProperty(value); } _getDefaultError() { return this.stepControl && this.stepControl.invalid && this.interacted; } /** Selects this step component. */ select() { this._stepper.selected = this; } /** Resets the step to its initial state. Note that this includes resetting form data. */ reset() { this.interacted = false; if (this._completedOverride != null) { this._completedOverride = false; } if (this._customError != null) { this._customError = false; } if (this.stepControl) { this.stepControl.reset(); } } ngOnChanges() { // Since basically all inputs of the MatStep get proxied through the view down to the // underlying MatStepHeader, we have to make sure that change detection runs correctly. this._stepper._stateChanged(); } } CdkStep.decorators = [ { type: Component, args: [{ selector: 'cdk-step', exportAs: 'cdkStep', template: '<ng-template><ng-content></ng-content></ng-template>', encapsulation: ViewEncapsulation.None, changeDetection: ChangeDetectionStrategy.OnPush },] } ]; CdkStep.ctorParameters = () => [ { type: CdkStepper, decorators: [{ type: Inject, args: [forwardRef(() => CdkStepper),] }] }, { type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [STEPPER_GLOBAL_OPTIONS,] }] } ]; CdkStep.propDecorators = { stepLabel: [{ type: ContentChild, args: [CdkStepLabel,] }], content: [{ type: ViewChild, args: [TemplateRef, { static: true },] }], stepControl: [{ type: Input }], label: [{ type: Input }], errorMessage: [{ type: Input }], ariaLabel: [{ type: Input, args: ['aria-label',] }], ariaLabelledby: [{ type: Input, args: ['aria-labelledby',] }], state: [{ type: Input }], editable: [{ type: Input }], optional: [{ type: Input }], completed: [{ type: Input }], hasError: [{ type: Input }] }; export class CdkStepper { constructor(_dir, _changeDetectorRef, // @breaking-change 8.0.0 `_elementRef` and `_document` parameters to become required. _elementRef, _document) { this._dir = _dir; this._changeDetectorRef = _changeDetectorRef; this._elementRef = _elementRef; /** Emits when the component is destroyed. */ this._destroyed = new Subject(); /** Steps that belong to the current stepper, excluding ones from nested steppers. */ this.steps = new QueryList(); this._linear = false; this._selectedIndex = 0; /** Event emitted when the selected step has changed. */ this.selectionChange = new EventEmitter(); this._orientation = 'horizontal'; this._groupId = nextId++; this._document = _document; } /** Whether the validity of previous steps should be checked or not. */ get linear() { return this._linear; } set linear(value) { this._linear = coerceBooleanProperty(value); } /** The index of the selected step. */ get selectedIndex() { return this._selectedIndex; } set selectedIndex(index) { const newIndex = coerceNumberProperty(index); if (this.steps && this._steps) { // Ensure that the index can't be out of bounds. if (!this._isValidIndex(index) && (typeof ngDevMode === 'undefined' || ngDevMode)) { throw Error('cdkStepper: Cannot assign out-of-bounds value to `selectedIndex`.'); } if (this._selectedIndex !== newIndex && !this._anyControlsInvalidOrPending(newIndex) && (newIndex >= this._selectedIndex || this.steps.toArray()[newIndex].editable)) { this._updateSelectedItemIndex(index); } } else { this._selectedIndex = newIndex; } } /** The step that is selected. */ get selected() { // @breaking-change 8.0.0 Change return type to `CdkStep | undefined`. return this.steps ? this.steps.toArray()[this.selectedIndex] : undefined; } set selected(step) { this.selectedIndex = this.steps ? this.steps.toArray().indexOf(step) : -1; } ngAfterContentInit() { this._steps.changes .pipe(startWith(this._steps), takeUntil(this._destroyed)) .subscribe((steps) => { this.steps.reset(steps.filter(step => step._stepper === this)); this.steps.notifyOnChanges(); }); } ngAfterViewInit() { // Note that while the step headers are content children by default, any components that // extend this one might have them as view children. We initialize the keyboard handling in // AfterViewInit so we're guaranteed for both view and content children to be defined. this._keyManager = new FocusKeyManager(this._stepHeader) .withWrap() .withHomeAndEnd() .withVerticalOrientation(this._orientation === 'vertical'); (this._dir ? this._dir.change : observableOf()) .pipe(startWith(this._layoutDirection()), takeUntil(this._destroyed)) .subscribe(direction => this._keyManager.withHorizontalOrientation(direction)); this._keyManager.updateActiveItem(this._selectedIndex); // No need to `takeUntil` here, because we're the ones destroying `steps`. this.steps.changes.subscribe(() => { if (!this.selected) { this._selectedIndex = Math.max(this._selectedIndex - 1, 0); } }); // The logic which asserts that the selected index is within bounds doesn't run before the // steps are initialized, because we don't how many steps there are yet so we may have an // invalid index on init. If that's the case, auto-correct to the default so we don't throw. if (!this._isValidIndex(this._selectedIndex)) { this._selectedIndex = 0; } } ngOnDestroy() { this.steps.destroy(); this._destroyed.next(); this._destroyed.complete(); } /** Selects and focuses the next step in list. */ next() { this.selectedIndex = Math.min(this._selectedIndex + 1, this.steps.length - 1); } /** Selects and focuses the previous step in list. */ previous() { this.selectedIndex = Math.max(this._selectedIndex - 1, 0); } /** Resets the stepper to its initial state. Note that this includes clearing form data. */ reset() { this._updateSelectedItemIndex(0); this.steps.forEach(step => step.reset()); this._stateChanged(); } /** Returns a unique id for each step label element. */ _getStepLabelId(i) { return `cdk-step-label-${this._groupId}-${i}`; } /** Returns unique id for each step content element. */ _getStepContentId(i) { return `cdk-step-content-${this._groupId}-${i}`; } /** Marks the component to be change detected. */ _stateChanged() { this._changeDetectorRef.markForCheck(); } /** Returns position state of the step with the given index. */ _getAnimationDirection(index) { const position = index - this._selectedIndex; if (position < 0) { return this._layoutDirection() === 'rtl' ? 'next' : 'previous'; } else if (position > 0) { return this._layoutDirection() === 'rtl' ? 'previous' : 'next'; } return 'current'; } /** Returns the type of icon to be displayed. */ _getIndicatorType(index, state = STEP_STATE.NUMBER) { const step = this.steps.toArray()[index]; const isCurrentStep = this._isCurrentStep(index); return step._displayDefaultIndicatorType ? this._getDefaultIndicatorLogic(step, isCurrentStep) : this._getGuidelineLogic(step, isCurrentStep, state); } _getDefaultIndicatorLogic(step, isCurrentStep) { if (step._showError && step.hasError && !isCurrentStep) { return STEP_STATE.ERROR; } else if (!step.completed || isCurrentStep) { return STEP_STATE.NUMBER; } else { return step.editable ? STEP_STATE.EDIT : STEP_STATE.DONE; } } _getGuidelineLogic(step, isCurrentStep, state = STEP_STATE.NUMBER) { if (step._showError && step.hasError && !isCurrentStep) { return STEP_STATE.ERROR; } else if (step.completed && !isCurrentStep) { return STEP_STATE.DONE; } else if (step.completed && isCurrentStep) { return state; } else if (step.editable && isCurrentStep) { return STEP_STATE.EDIT; } else { return state; } } _isCurrentStep(index) { return this._selectedIndex === index; } /** Returns the index of the currently-focused step header. */ _getFocusIndex() { return this._keyManager ? this._keyManager.activeItemIndex : this._selectedIndex; } _updateSelectedItemIndex(newIndex) { const stepsArray = this.steps.toArray(); this.selectionChange.emit({ selectedIndex: newIndex, previouslySelectedIndex: this._selectedIndex, selectedStep: stepsArray[newIndex], previouslySelectedStep: stepsArray[this._selectedIndex], }); // If focus is inside the stepper, move it to the next header, otherwise it may become // lost when the active step content is hidden. We can't be more granular with the check // (e.g. checking whether focus is inside the active step), because we don't have a // reference to the elements that are rendering out the content. this._containsFocus() ? this._keyManager.setActiveItem(newIndex) : this._keyManager.updateActiveItem(newIndex); this._selectedIndex = newIndex; this._stateChanged(); } _onKeydown(event) { const hasModifier = hasModifierKey(event); const keyCode = event.keyCode; const manager = this._keyManager; if (manager.activeItemIndex != null && !hasModifier && (keyCode === SPACE || keyCode === ENTER)) { this.selectedIndex = manager.activeItemIndex; event.preventDefault(); } else { manager.onKeydown(event); } } _anyControlsInvalidOrPending(index) { const steps = this.steps.toArray(); steps[this._selectedIndex].interacted = true; if (this._linear && index >= 0) { return steps.slice(0, index).some(step => { const control = step.stepControl; const isIncomplete = control ? (control.invalid || control.pending || !step.interacted) : !step.completed; return isIncomplete && !step.optional && !step._completedOverride; }); } return false; } _layoutDirection() { return this._dir && this._dir.value === 'rtl' ? 'rtl' : 'ltr'; } /** Checks whether the stepper contains the focused element. */ _containsFocus() { if (!this._document || !this._elementRef) { return false; } const stepperElement = this._elementRef.nativeElement; const focusedElement = this._document.activeElement; return stepperElement === focusedElement || stepperElement.contains(focusedElement); } /** Checks whether the passed-in index is a valid step index. */ _isValidIndex(index) { return index > -1 && (!this.steps || index < this.steps.length); } } CdkStepper.decorators = [ { type: Directive, args: [{ selector: '[cdkStepper]', exportAs: 'cdkStepper', },] } ]; CdkStepper.ctorParameters = () => [ { type: Directionality, decorators: [{ type: Optional }] }, { type: ChangeDetectorRef }, { type: ElementRef }, { type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] } ]; CdkStepper.propDecorators = { _steps: [{ type: ContentChildren, args: [CdkStep, { descendants: true },] }], _stepHeader: [{ type: ContentChildren, args: [CdkStepHeader, { descendants: true },] }], linear: [{ type: Input }], selectedIndex: [{ type: Input }], selected: [{ type: Input }], selectionChange: [{ type: Output }] }; //# 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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 {FocusableOption, FocusKeyManager} from '@angular/cdk/a11y';\nimport {Direction, Directionality} from '@angular/cdk/bidi';\nimport {\n  BooleanInput,\n  coerceBooleanProperty,\n  coerceNumberProperty,\n  NumberInput\n} from '@angular/cdk/coercion';\nimport {ENTER, hasModifierKey, SPACE} from '@angular/cdk/keycodes';\nimport {DOCUMENT} from '@angular/common';\nimport {\n  AfterViewInit,\n  ChangeDetectionStrategy,\n  ChangeDetectorRef,\n  Component,\n  ContentChild,\n  ContentChildren,\n  Directive,\n  ElementRef,\n  EventEmitter,\n  forwardRef,\n  Inject,\n  InjectionToken,\n  Input,\n  OnChanges,\n  OnDestroy,\n  Optional,\n  Output,\n  QueryList,\n  TemplateRef,\n  ViewChild,\n  ViewEncapsulation,\n  AfterContentInit,\n} from '@angular/core';\nimport {Observable, of as observableOf, Subject} from 'rxjs';\nimport {startWith, takeUntil} from 'rxjs/operators';\n\nimport {CdkStepHeader} from './step-header';\nimport {CdkStepLabel} from './step-label';\n\n/** Used to generate unique ID for each stepper component. */\nlet nextId = 0;\n\n/**\n * Position state of the content of each step in stepper that is used for transitioning\n * the content into correct position upon step selection change.\n */\nexport type StepContentPositionState = 'previous'|'current'|'next';\n\n/** Possible orientation of a stepper. */\nexport type StepperOrientation = 'horizontal'|'vertical';\n\n/** Change event emitted on selection changes. */\nexport class StepperSelectionEvent {\n  /** Index of the step now selected. */\n  selectedIndex: number;\n\n  /** Index of the step previously selected. */\n  previouslySelectedIndex: number;\n\n  /** The step instance now selected. */\n  selectedStep: CdkStep;\n\n  /** The step instance previously selected. */\n  previouslySelectedStep: CdkStep;\n}\n\n/** The state of each step. */\nexport type StepState = 'number'|'edit'|'done'|'error'|string;\n\n/** Enum to represent the different states of the steps. */\nexport const STEP_STATE = {\n  NUMBER: 'number',\n  EDIT: 'edit',\n  DONE: 'done',\n  ERROR: 'error'\n};\n\n/** InjectionToken that can be used to specify the global stepper options. */\nexport const STEPPER_GLOBAL_OPTIONS = new InjectionToken<StepperOptions>('STEPPER_GLOBAL_OPTIONS');\n\n/**\n * InjectionToken that can be used to specify the global stepper options.\n * @deprecated Use `STEPPER_GLOBAL_OPTIONS` instead.\n * @breaking-change 8.0.0.\n */\nexport const MAT_STEPPER_GLOBAL_OPTIONS = STEPPER_GLOBAL_OPTIONS;\n\n/** Configurable options for stepper. */\nexport interface StepperOptions {\n  /**\n   * Whether the stepper should display an error state or not.\n   * Default behavior is assumed to be false.\n   */\n  showError?: boolean;\n\n  /**\n   * Whether the stepper should display the default indicator type\n   * or not.\n   * Default behavior is assumed to be true.\n   */\n  displayDefaultIndicatorType?: boolean;\n}\n\n@Component({\n  selector: 'cdk-step',\n  exportAs: 'cdkStep',\n  template: '<ng-template><ng-content></ng-content></ng-template>',\n  encapsulation: ViewEncapsulation.None,\n  changeDetection: ChangeDetectionStrategy.OnPush,\n})\nexport class CdkStep implements OnChanges {\n  private _stepperOptions: StepperOptions;\n  _showError: boolean;\n  _displayDefaultIndicatorType: boolean;\n\n  /** Template for step label if it exists. */\n  @ContentChild(CdkStepLabel) stepLabel: CdkStepLabel;\n\n  /** Template for step content. */\n  @ViewChild(TemplateRef, {static: true}) content: TemplateRef<any>;\n\n  /** The top level abstract control of the step. */\n  @Input() stepControl: AbstractControlLike;\n\n  /** Whether user has seen the expanded step content or not. */\n  interacted = false;\n\n  /** Plain text label of the step. */\n  @Input() label: string;\n\n  /** Error message to display when there's an error. */\n  @Input() errorMessage: string;\n\n  /** Aria label for the tab. */\n  @Input('aria-label') ariaLabel: string;\n\n  /**\n   * Reference to the element that the tab is labelled by.\n   * Will be cleared if `aria-label` is set at the same time.\n   */\n  @Input('aria-labelledby') ariaLabelledby: string;\n\n  /** State of the step. */\n  @Input() state: StepState;\n\n  /** Whether the user can return to this step once it has been marked as completed. */\n  @Input()\n  get editable(): boolean {\n    return this._editable;\n  }\n  set editable(value: boolean) {\n    this._editable = coerceBooleanProperty(value);\n  }\n  private _editable = true;\n\n  /** Whether the completion of step is optional. */\n  @Input()\n  get optional(): boolean {\n    return this._optional;\n  }\n  set optional(value: boolean) {\n    this._optional = coerceBooleanProperty(value);\n  }\n  private _optional = false;\n\n  /** Whether step is marked as completed. */\n  @Input()\n  get completed(): boolean {\n    return this._completedOverride == null ? this._getDefaultCompleted() : this._completedOverride;\n  }\n  set completed(value: boolean) {\n    this._completedOverride = coerceBooleanProperty(value);\n  }\n  _completedOverride: boolean|null = null;\n\n  private _getDefaultCompleted() {\n    return this.stepControl ? this.stepControl.valid && this.interacted : this.interacted;\n  }\n\n  /** Whether step has an error. */\n  @Input()\n  get hasError(): boolean {\n    return this._customError == null ? this._getDefaultError() : this._customError;\n  }\n  set hasError(value: boolean) {\n    this._customError = coerceBooleanProperty(value);\n  }\n  private _customError: boolean|null = null;\n\n  private _getDefaultError() {\n    return this.stepControl && this.stepControl.invalid && this.interacted;\n  }\n\n  /** @breaking-change 8.0.0 remove the `?` after `stepperOptions` */\n  constructor(\n      @Inject(forwardRef(() => CdkStepper)) public _stepper: CdkStepper,\n      @Optional() @Inject(STEPPER_GLOBAL_OPTIONS) stepperOptions?: StepperOptions) {\n    this._stepperOptions = stepperOptions ? stepperOptions : {};\n    this._displayDefaultIndicatorType = this._stepperOptions.displayDefaultIndicatorType !== false;\n    this._showError = !!this._stepperOptions.showError;\n  }\n\n  /** Selects this step component. */\n  select(): void {\n    this._stepper.selected = this;\n  }\n\n  /** Resets the step to its initial state. Note that this includes resetting form data. */\n  reset(): void {\n    this.interacted = false;\n\n    if (this._completedOverride != null) {\n      this._completedOverride = false;\n    }\n\n    if (this._customError != null) {\n      this._customError = false;\n    }\n\n    if (this.stepControl) {\n      this.stepControl.reset();\n    }\n  }\n\n  ngOnChanges() {\n    // Since basically all inputs of the MatStep get proxied through the view down to the\n    // underlying MatStepHeader, we have to make sure that change detection runs correctly.\n    this._stepper._stateChanged();\n  }\n\n  static ngAcceptInputType_editable: BooleanInput;\n  static ngAcceptInputType_hasError: BooleanInput;\n  static ngAcceptInputType_optional: BooleanInput;\n  static ngAcceptInputType_completed: BooleanInput;\n}\n\n@Directive({\n  selector: '[cdkStepper]',\n  exportAs: 'cdkStepper',\n})\nexport class CdkStepper implements AfterContentInit, AfterViewInit, OnDestroy {\n  /** Emits when the component is destroyed. */\n  protected _destroyed = new Subject<void>();\n\n  /** Used for managing keyboard focus. */\n  private _keyManager: FocusKeyManager<FocusableOption>;\n\n  /**\n   * @breaking-change 8.0.0 Remove `| undefined` once the `_document`\n   * constructor param is required.\n   */\n  private _document: Document|undefined;\n\n  /** Full list of steps inside the stepper, including inside nested steppers. */\n  @ContentChildren(CdkStep, {descendants: true}) _steps: QueryList<CdkStep>;\n\n  /** Steps that belong to the current stepper, excluding ones from nested steppers. */\n  readonly steps: QueryList<CdkStep> = new QueryList<CdkStep>();\n\n  /**\n   * The list of step headers of the steps in the stepper.\n   * @deprecated Type to be changed to `QueryList<CdkStepHeader>`.\n   * @breaking-change 8.0.0\n   */\n  @ContentChildren(CdkStepHeader, {descendants: true}) _stepHeader: QueryList<FocusableOption>;\n\n  /** Whether the validity of previous steps should be checked or not. */\n  @Input()\n  get linear(): boolean {\n    return this._linear;\n  }\n  set linear(value: boolean) {\n    this._linear = coerceBooleanProperty(value);\n  }\n  private _linear = false;\n\n  /** The index of the selected step. */\n  @Input()\n  get selectedIndex() {\n    return this._selectedIndex;\n  }\n  set selectedIndex(index: number) {\n    const newIndex = coerceNumberProperty(index);\n\n    if (this.steps && this._steps) {\n      // Ensure that the index can't be out of bounds.\n      if (!this._isValidIndex(index) && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n        throw Error('cdkStepper: Cannot assign out-of-bounds value to `selectedIndex`.');\n      }\n\n      if (this._selectedIndex !== newIndex && !this._anyControlsInvalidOrPending(newIndex) &&\n          (newIndex >= this._selectedIndex || this.steps.toArray()[newIndex].editable)) {\n        this._updateSelectedItemIndex(index);\n      }\n    } else {\n      this._selectedIndex = newIndex;\n    }\n  }\n  private _selectedIndex = 0;\n\n  /** The step that is selected. */\n  @Input()\n  get selected(): CdkStep {\n    // @breaking-change 8.0.0 Change return type to `CdkStep | undefined`.\n    return this.steps ? this.steps.toArray()[this.selectedIndex] : undefined!;\n  }\n  set selected(step: CdkStep) {\n    this.selectedIndex = this.steps ? this.steps.toArray().indexOf(step) : -1;\n  }\n\n  /** Event emitted when the selected step has changed. */\n  @Output()\n  selectionChange: EventEmitter<StepperSelectionEvent> = new EventEmitter<StepperSelectionEvent>();\n\n  /** Used to track unique ID for each stepper component. */\n  _groupId: number;\n\n  protected _orientation: StepperOrientation = 'horizontal';\n\n  constructor(\n      @Optional() private _dir: Directionality, private _changeDetectorRef: ChangeDetectorRef,\n      // @breaking-change 8.0.0 `_elementRef` and `_document` parameters to become required.\n      private _elementRef?: ElementRef<HTMLElement>, @Inject(DOCUMENT) _document?: any) {\n    this._groupId = nextId++;\n    this._document = _document;\n  }\n\n  ngAfterContentInit() {\n    this._steps.changes\n      .pipe(startWith(this._steps), takeUntil(this._destroyed))\n      .subscribe((steps: QueryList<CdkStep>) => {\n        this.steps.reset(steps.filter(step => step._stepper === this));\n        this.steps.notifyOnChanges();\n      });\n  }\n\n  ngAfterViewInit() {\n    // Note that while the step headers are content children by default, any components that\n    // extend this one might have them as view children. We initialize the keyboard handling in\n    // AfterViewInit so we're guaranteed for both view and content children to be defined.\n    this._keyManager = new FocusKeyManager<FocusableOption>(this._stepHeader)\n                           .withWrap()\n                           .withHomeAndEnd()\n                           .withVerticalOrientation(this._orientation === 'vertical');\n\n    (this._dir ? (this._dir.change as Observable<Direction>) : observableOf<Direction>())\n        .pipe(startWith(this._layoutDirection()), takeUntil(this._destroyed))\n        .subscribe(direction => this._keyManager.withHorizontalOrientation(direction));\n\n    this._keyManager.updateActiveItem(this._selectedIndex);\n\n    // No need to `takeUntil` here, because we're the ones destroying `steps`.\n    this.steps.changes.subscribe(() => {\n      if (!this.selected) {\n        this._selectedIndex = Math.max(this._selectedIndex - 1, 0);\n      }\n    });\n\n    // The logic which asserts that the selected index is within bounds doesn't run before the\n    // steps are initialized, because we don't how many steps there are yet so we may have an\n    // invalid index on init. If that's the case, auto-correct to the default so we don't throw.\n    if (!this._isValidIndex(this._selectedIndex)) {\n      this._selectedIndex = 0;\n    }\n  }\n\n  ngOnDestroy() {\n    this.steps.destroy();\n    this._destroyed.next();\n    this._destroyed.complete();\n  }\n\n  /** Selects and focuses the next step in list. */\n  next(): void {\n    this.selectedIndex = Math.min(this._selectedIndex + 1, this.steps.length - 1);\n  }\n\n  /** Selects and focuses the previous step in list. */\n  previous(): void {\n    this.selectedIndex = Math.max(this._selectedIndex - 1, 0);\n  }\n\n  /** Resets the stepper to its initial state. Note that this includes clearing form data. */\n  reset(): void {\n    this._updateSelectedItemIndex(0);\n    this.steps.forEach(step => step.reset());\n    this._stateChanged();\n  }\n\n  /** Returns a unique id for each step label element. */\n  _getStepLabelId(i: number): string {\n    return `cdk-step-label-${this._groupId}-${i}`;\n  }\n\n  /** Returns unique id for each step content element. */\n  _getStepContentId(i: number): string {\n    return `cdk-step-content-${this._groupId}-${i}`;\n  }\n\n  /** Marks the component to be change detected. */\n  _stateChanged() {\n    this._changeDetectorRef.markForCheck();\n  }\n\n  /** Returns position state of the step with the given index. */\n  _getAnimationDirection(index: number): StepContentPositionState {\n    const position = index - this._selectedIndex;\n    if (position < 0) {\n      return this._layoutDirection() === 'rtl' ? 'next' : 'previous';\n    } else if (position > 0) {\n      return this._layoutDirection() === 'rtl' ? 'previous' : 'next';\n    }\n    return 'current';\n  }\n\n  /** Returns the type of icon to be displayed. */\n  _getIndicatorType(index: number, state: StepState = STEP_STAT