/**
 * @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 { Directionality } from '@angular/cdk/bidi';
import { Directive, ElementRef, InjectionToken, NgZone, Optional } from '@angular/core';
import { ScrollDispatcher } from './scroll-dispatcher';
import { CdkScrollable } from './scrollable';
import * as i0 from "@angular/core";
import * as i1 from "./scroll-dispatcher";
import * as i2 from "@angular/cdk/bidi";
export const VIRTUAL_SCROLLABLE = new InjectionToken('VIRTUAL_SCROLLABLE');
/**
 * Extending the {@link CdkScrollable} to be used as scrolling container for virtual scrolling.
 */
export class CdkVirtualScrollable extends CdkScrollable {
    constructor(elementRef, scrollDispatcher, ngZone, dir) {
        super(elementRef, scrollDispatcher, ngZone, dir);
    }
    /**
     * Measure the viewport size for the provided orientation.
     *
     * @param orientation The orientation to measure the size from.
     */
    measureViewportSize(orientation) {
        const viewportEl = this.elementRef.nativeElement;
        return orientation === 'horizontal' ? viewportEl.clientWidth : viewportEl.clientHeight;
    }
    static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkVirtualScrollable, deps: [{ token: i0.ElementRef }, { token: i1.ScrollDispatcher }, { token: i0.NgZone }, { token: i2.Directionality, optional: true }], target: i0.ɵɵFactoryTarget.Directive }); }
    static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "16.1.1", type: CdkVirtualScrollable, usesInheritance: true, ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkVirtualScrollable, decorators: [{
            type: Directive
        }], ctorParameters: function () { return [{ type: i0.ElementRef }, { type: i1.ScrollDispatcher }, { type: i0.NgZone }, { type: i2.Directionality, decorators: [{
                    type: Optional
                }] }]; } });
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