@angular/cdk
Version:
Angular Material Component Development Kit
47 lines • 5.84 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";
/**
* 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.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "13.0.1", ngImport: i0, type: Directionality, deps: [{ token: DIR_DOCUMENT, optional: true }], target: i0.ɵɵFactoryTarget.Injectable });
Directionality.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "13.0.1", ngImport: i0, type: Directionality, providedIn: 'root' });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "13.0.1", 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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