node_modules/@angular/cdk/esm2015/bidi/directionality.js

/**
 * @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 { EventEmitter, Inject, Injectable, Optional } from '@angular/core';
import { DIR_DOCUMENT } from './dir-document-token';
import * as i0 from "@angular/core";
import * as i1 from "./dir-document-token";
/**
 * The directionality (LTR / RTL) context for the application (or a subtree of it).
 * Exposes the current direction and a stream of direction changes.
 */
export class Directionality {
    constructor(_document) {
        /** The current 'ltr' or 'rtl' value. */
        this.value = 'ltr';
        /** Stream that emits whenever the 'ltr' / 'rtl' state changes. */
        this.change = new EventEmitter();
        if (_document) {
            // TODO: handle 'auto' value -
            // We still need to account for dir="auto".
            // It looks like HTMLElemenet.dir is also "auto" when that's set to the attribute,
            // but getComputedStyle return either "ltr" or "rtl". avoiding getComputedStyle for now
            const bodyDir = _document.body ? _document.body.dir : null;
            const htmlDir = _document.documentElement ? _document.documentElement.dir : null;
            const value = bodyDir || htmlDir;
            this.value = (value === 'ltr' || value === 'rtl') ? value : 'ltr';
        }
    }
    ngOnDestroy() {
        this.change.complete();
    }
}
Directionality.ɵprov = i0.ɵɵdefineInjectable({ factory: function Directionality_Factory() { return new Directionality(i0.ɵɵinject(i1.DIR_DOCUMENT, 8)); }, token: Directionality, providedIn: "root" });
Directionality.decorators = [
    { type: Injectable, args: [{ providedIn: 'root' },] }
];
Directionality.ctorParameters = () => [
    { type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [DIR_DOCUMENT,] }] }
];
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