/**
 * @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 { Directive, Input, ContentChildren, QueryList, } from '@angular/core';
import { coerceBooleanProperty } from '@angular/cdk/coercion';
import { CdkAccordion } from '@angular/cdk/accordion';
import { FocusKeyManager } from '@angular/cdk/a11y';
import { startWith } from 'rxjs/operators';
import { MAT_ACCORDION, } from './accordion-base';
import { MatExpansionPanelHeader } from './expansion-panel-header';
import * as i0 from "@angular/core";
/**
 * Directive for a Material Design Accordion.
 */
export class MatAccordion extends CdkAccordion {
    constructor() {
        super(...arguments);
        /** Headers belonging to this accordion. */
        this._ownHeaders = new QueryList();
        this._hideToggle = false;
        /**
         * Display mode used for all expansion panels in the accordion. Currently two display
         * modes exist:
         *  default - a gutter-like spacing is placed around any expanded panel, placing the expanded
         *     panel at a different elevation from the rest of the accordion.
         *  flat - no spacing is placed around expanded panels, showing all panels at the same
         *     elevation.
         */
        this.displayMode = 'default';
        /** The position of the expansion indicator. */
        this.togglePosition = 'after';
    }
    /** Whether the expansion indicator should be hidden. */
    get hideToggle() {
        return this._hideToggle;
    }
    set hideToggle(show) {
        this._hideToggle = coerceBooleanProperty(show);
    }
    ngAfterContentInit() {
        this._headers.changes
            .pipe(startWith(this._headers))
            .subscribe((headers) => {
            this._ownHeaders.reset(headers.filter(header => header.panel.accordion === this));
            this._ownHeaders.notifyOnChanges();
        });
        this._keyManager = new FocusKeyManager(this._ownHeaders).withWrap().withHomeAndEnd();
    }
    /** Handles keyboard events coming in from the panel headers. */
    _handleHeaderKeydown(event) {
        this._keyManager.onKeydown(event);
    }
    _handleHeaderFocus(header) {
        this._keyManager.updateActiveItem(header);
    }
    ngOnDestroy() {
        super.ngOnDestroy();
        this._keyManager?.destroy();
        this._ownHeaders.destroy();
    }
    static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: MatAccordion, deps: null, target: i0.ɵɵFactoryTarget.Directive }); }
    static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "16.1.1", type: MatAccordion, selector: "mat-accordion", inputs: { multi: "multi", hideToggle: "hideToggle", displayMode: "displayMode", togglePosition: "togglePosition" }, host: { properties: { "class.mat-accordion-multi": "this.multi" }, classAttribute: "mat-accordion" }, providers: [
            {
                provide: MAT_ACCORDION,
                useExisting: MatAccordion,
            },
        ], queries: [{ propertyName: "_headers", predicate: MatExpansionPanelHeader, descendants: true }], exportAs: ["matAccordion"], usesInheritance: true, ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: MatAccordion, decorators: [{
            type: Directive,
            args: [{
                    selector: 'mat-accordion',
                    exportAs: 'matAccordion',
                    inputs: ['multi'],
                    providers: [
                        {
                            provide: MAT_ACCORDION,
                            useExisting: MatAccordion,
                        },
                    ],
                    host: {
                        class: 'mat-accordion',
                        // Class binding which is only used by the test harness as there is no other
                        // way for the harness to detect if multiple panel support is enabled.
                        '[class.mat-accordion-multi]': 'this.multi',
                    },
                }]
        }], propDecorators: { _headers: [{
                type: ContentChildren,
                args: [MatExpansionPanelHeader, { descendants: true }]
            }], hideToggle: [{
                type: Input
            }], displayMode: [{
                type: Input
            }], togglePosition: [{
                type: Input
            }] } });
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