@angular/cdk
Version:
Angular Material Component Development Kit
53 lines • 6.95 kB
JavaScript
/**
* @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";
/** Regex that matches locales with an RTL script. Taken from `goog.i18n.bidi.isRtlLanguage`. */
const RTL_LOCALE_PATTERN = /^(ar|ckb|dv|he|iw|fa|nqo|ps|sd|ug|ur|yi|.*[-_](Adlm|Arab|Hebr|Nkoo|Rohg|Thaa))(?!.*[-_](Latn|Cyrl)($|-|_))($|-|_)/i;
/** Resolves a string value to a specific direction. */
export function _resolveDirectionality(rawValue) {
const value = rawValue?.toLowerCase() || '';
if (value === 'auto' && typeof navigator !== 'undefined' && navigator?.language) {
return RTL_LOCALE_PATTERN.test(navigator.language) ? 'rtl' : 'ltr';
}
return value === 'rtl' ? 'rtl' : 'ltr';
}
/**
* The directionality (LTR / RTL) context for the application (or a subtree of it).
* Exposes the current direction and a stream of direction changes.
*/
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) {
const bodyDir = _document.body ? _document.body.dir : null;
const htmlDir = _document.documentElement ? _document.documentElement.dir : null;
this.value = _resolveDirectionality(bodyDir || htmlDir || 'ltr');
}
}
ngOnDestroy() {
this.change.complete();
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.0.0", ngImport: i0, type: Directionality, deps: [{ token: DIR_DOCUMENT, optional: true }], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.0.0", ngImport: i0, type: Directionality, providedIn: 'root' }); }
}
export { Directionality };
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.0.0", ngImport: i0, type: Directionality, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}], ctorParameters: function () { return [{ type: undefined, decorators: [{
type: Optional
}, {
type: Inject,
args: [DIR_DOCUMENT]
}] }]; } });
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