/**
 * @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 { Output, Directive, EventEmitter, Input, Optional, ChangeDetectorRef, SkipSelf, Inject, } from '@angular/core';
import { UniqueSelectionDispatcher } from '@angular/cdk/collections';
import { CDK_ACCORDION, CdkAccordion } from './accordion';
import { coerceBooleanProperty } from '@angular/cdk/coercion';
import { Subscription } from 'rxjs';
/** Used to generate unique ID for each accordion item. */
let nextId = 0;
const ɵ0 = undefined;
/**
 * An basic directive expected to be extended and decorated as a component.  Sets up all
 * events and attributes needed to be managed by a CdkAccordion parent.
 */
export class CdkAccordionItem {
    constructor(accordion, _changeDetectorRef, _expansionDispatcher) {
        this.accordion = accordion;
        this._changeDetectorRef = _changeDetectorRef;
        this._expansionDispatcher = _expansionDispatcher;
        /** Subscription to openAll/closeAll events. */
        this._openCloseAllSubscription = Subscription.EMPTY;
        /** Event emitted every time the AccordionItem is closed. */
        this.closed = new EventEmitter();
        /** Event emitted every time the AccordionItem is opened. */
        this.opened = new EventEmitter();
        /** Event emitted when the AccordionItem is destroyed. */
        this.destroyed = new EventEmitter();
        /**
         * Emits whenever the expanded state of the accordion changes.
         * Primarily used to facilitate two-way binding.
         * @docs-private
         */
        this.expandedChange = new EventEmitter();
        /** The unique AccordionItem id. */
        this.id = `cdk-accordion-child-${nextId++}`;
        this._expanded = false;
        this._disabled = false;
        /** Unregister function for _expansionDispatcher. */
        this._removeUniqueSelectionListener = () => { };
        this._removeUniqueSelectionListener =
            _expansionDispatcher.listen((id, accordionId) => {
                if (this.accordion && !this.accordion.multi &&
                    this.accordion.id === accordionId && this.id !== id) {
                    this.expanded = false;
                }
            });
        // When an accordion item is hosted in an accordion, subscribe to open/close events.
        if (this.accordion) {
            this._openCloseAllSubscription = this._subscribeToOpenCloseAllActions();
        }
    }
    /** Whether the AccordionItem is expanded. */
    get expanded() { return this._expanded; }
    set expanded(expanded) {
        expanded = coerceBooleanProperty(expanded);
        // Only emit events and update the internal value if the value changes.
        if (this._expanded !== expanded) {
            this._expanded = expanded;
            this.expandedChange.emit(expanded);
            if (expanded) {
                this.opened.emit();
                /**
                 * In the unique selection dispatcher, the id parameter is the id of the CdkAccordionItem,
                 * the name value is the id of the accordion.
                 */
                const accordionId = this.accordion ? this.accordion.id : this.id;
                this._expansionDispatcher.notify(this.id, accordionId);
            }
            else {
                this.closed.emit();
            }
            // Ensures that the animation will run when the value is set outside of an `@Input`.
            // This includes cases like the open, close and toggle methods.
            this._changeDetectorRef.markForCheck();
        }
    }
    /** Whether the AccordionItem is disabled. */
    get disabled() { return this._disabled; }
    set disabled(disabled) { this._disabled = coerceBooleanProperty(disabled); }
    /** Emits an event for the accordion item being destroyed. */
    ngOnDestroy() {
        this.opened.complete();
        this.closed.complete();
        this.destroyed.emit();
        this.destroyed.complete();
        this._removeUniqueSelectionListener();
        this._openCloseAllSubscription.unsubscribe();
    }
    /** Toggles the expanded state of the accordion item. */
    toggle() {
        if (!this.disabled) {
            this.expanded = !this.expanded;
        }
    }
    /** Sets the expanded state of the accordion item to false. */
    close() {
        if (!this.disabled) {
            this.expanded = false;
        }
    }
    /** Sets the expanded state of the accordion item to true. */
    open() {
        if (!this.disabled) {
            this.expanded = true;
        }
    }
    _subscribeToOpenCloseAllActions() {
        return this.accordion._openCloseAllActions.subscribe(expanded => {
            // Only change expanded state if item is enabled
            if (!this.disabled) {
                this.expanded = expanded;
            }
        });
    }
}
CdkAccordionItem.decorators = [
    { type: Directive, args: [{
                selector: 'cdk-accordion-item, [cdkAccordionItem]',
                exportAs: 'cdkAccordionItem',
                providers: [
                    // Provide `CDK_ACCORDION` as undefined to prevent nested accordion items from
                    // registering to the same accordion.
                    { provide: CDK_ACCORDION, useValue: ɵ0 },
                ],
            },] }
];
CdkAccordionItem.ctorParameters = () => [
    { type: CdkAccordion, decorators: [{ type: Optional }, { type: Inject, args: [CDK_ACCORDION,] }, { type: SkipSelf }] },
    { type: ChangeDetectorRef },
    { type: UniqueSelectionDispatcher }
];
CdkAccordionItem.propDecorators = {
    closed: [{ type: Output }],
    opened: [{ type: Output }],
    destroyed: [{ type: Output }],
    expandedChange: [{ type: Output }],
    expanded: [{ type: Input }],
    disabled: [{ type: Input }]
};
export { ɵ0 };
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Sets up all\n * events and attributes needed to be managed by a CdkAccordion parent.\n */\n@Directive({\n  selector: 'cdk-accordion-item, [cdkAccordionItem]',\n  exportAs: 'cdkAccordionItem',\n  providers: [\n    // Provide `CDK_ACCORDION` as undefined to prevent nested accordion items from\n    // registering to the same accordion.\n    {provide: CDK_ACCORDION, useValue: undefined},\n  ],\n})\nexport class CdkAccordionItem implements OnDestroy {\n  /** Subscription to openAll/closeAll events. */\n  private _openCloseAllSubscription = Subscription.EMPTY;\n  /** Event emitted every time the AccordionItem is closed. */\n  @Output() readonly closed: EventEmitter<void> = new EventEmitter<void>();\n  /** Event emitted every time the AccordionItem is opened. */\n  @Output() readonly opened: EventEmitter<void> = new EventEmitter<void>();\n  /** Event emitted when the AccordionItem is destroyed. */\n  @Output() readonly destroyed: EventEmitter<void> = new EventEmitter<void>();\n\n  /**\n   * Emits whenever the expanded state of the accordion changes.\n   * Primarily used to facilitate two-way binding.\n   * @docs-private\n   */\n  @Output() readonly expandedChange: EventEmitter<boolean> = new EventEmitter<boolean>();\n\n  /** The unique AccordionItem id. */\n  readonly id: string = `cdk-accordion-child-${nextId++}`;\n\n  /** Whether the AccordionItem is expanded. */\n  @Input()\n  get expanded(): boolean { return this._expanded; }\n  set expanded(expanded: boolean) {\n    expanded = coerceBooleanProperty(expanded);\n\n    // Only emit events and update the internal value if the value changes.\n    if (this._expanded !== expanded) {\n      this._expanded = expanded;\n      this.expandedChange.emit(expanded);\n\n      if (expanded) {\n        this.opened.emit();\n        /**\n         * In the unique selection dispatcher, the id parameter is the id of the CdkAccordionItem,\n         * the name value is the id of the accordion.\n         */\n        const accordionId = this.accordion ? this.accordion.id : this.id;\n        this._expansionDispatcher.notify(this.id, accordionId);\n      } else {\n        this.closed.emit();\n      }\n\n      // Ensures that the animation will run when the value is set outside of an `@Input`.\n      // This includes cases like the open, close and toggle methods.\n      this._changeDetectorRef.markForCheck();\n    }\n  }\n  private _expanded = false;\n\n  /** Whether the AccordionItem is disabled. */\n  @Input()\n  get disabled(): boolean { return this._disabled; }\n  set disabled(disabled: boolean) { this._disabled = coerceBooleanProperty(disabled); }\n  private _disabled = false;\n\n  /** Unregister function for _expansionDispatcher. */\n  private _removeUniqueSelectionListener: () => void = () => {};\n\n  constructor(@Optional() @Inject(CDK_ACCORDION) @SkipSelf() public accordion: CdkAccordion,\n              private _changeDetectorRef: ChangeDetectorRef,\n              protected _expansionDispatcher: UniqueSelectionDispatcher) {\n    this._removeUniqueSelectionListener =\n      _expansionDispatcher.listen((id: string, accordionId: string) => {\n        if (this.accordion && !this.accordion.multi &&\n            this.accordion.id === accordionId && this.id !== id) {\n          this.expanded = false;\n        }\n      });\n\n    // When an accordion item is hosted in an accordion, subscribe to open/close events.\n    if (this.accordion) {\n      this._openCloseAllSubscription = this._subscribeToOpenCloseAllActions();\n    }\n  }\n\n  /** Emits an event for the accordion item being destroyed. */\n  ngOnDestroy() {\n    this.opened.complete();\n    this.closed.complete();\n    this.destroyed.emit();\n    this.destroyed.complete();\n    this._removeUniqueSelectionListener();\n    this._openCloseAllSubscription.unsubscribe();\n  }\n\n  /** Toggles the expanded state of the accordion item. */\n  toggle(): void {\n    if (!this.disabled) {\n      this.expanded = !this.expanded;\n    }\n  }\n\n  /** Sets the expanded state of the accordion item to false. */\n  close(): void {\n    if (!this.disabled) {\n      this.expanded = false;\n    }\n  }\n\n  /** Sets the expanded state of the accordion item to true. */\n  open(): void {\n    if (!this.disabled) {\n      this.expanded = true;\n    }\n  }\n\n  private _subscribeToOpenCloseAllActions(): Subscription {\n    return this.accordion._openCloseAllActions.subscribe(expanded => {\n      // Only change expanded state if item is enabled\n      if (!this.disabled) {\n        this.expanded = expanded;\n      }\n    });\n  }\n\n  static ngAcceptInputType_expanded: BooleanInput;\n  static ngAcceptInputType_disabled: BooleanInput;\n}\n"]}