node_modules/@angular/cdk/esm2015/bidi/dir.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 { Directive, Output, Input, EventEmitter, } from '@angular/core';
import { Directionality } from './directionality';
/**
 * Directive to listen for changes of direction of part of the DOM.
 *
 * Provides itself as Directionality such that descendant directives only need to ever inject
 * Directionality to get the closest direction.
 */
export class Dir {
    constructor() {
        /** Normalized direction that accounts for invalid/unsupported values. */
        this._dir = 'ltr';
        /** Whether the `value` has been set to its initial value. */
        this._isInitialized = false;
        /** Event emitted when the direction changes. */
        this.change = new EventEmitter();
    }
    /** @docs-private */
    get dir() { return this._dir; }
    set dir(value) {
        const old = this._dir;
        const normalizedValue = value ? value.toLowerCase() : value;
        this._rawDir = value;
        this._dir = (normalizedValue === 'ltr' || normalizedValue === 'rtl') ? normalizedValue : 'ltr';
        if (old !== this._dir && this._isInitialized) {
            this.change.emit(this._dir);
        }
    }
    /** Current layout direction of the element. */
    get value() { return this.dir; }
    /** Initialize once default value has been set. */
    ngAfterContentInit() {
        this._isInitialized = true;
    }
    ngOnDestroy() {
        this.change.complete();
    }
}
Dir.decorators = [
    { type: Directive, args: [{
                selector: '[dir]',
                providers: [{ provide: Directionality, useExisting: Dir }],
                host: { '[attr.dir]': '_rawDir' },
                exportAs: 'dir',
            },] }
];
Dir.propDecorators = {
    change: [{ type: Output, args: ['dirChange',] }],
    dir: [{ type: Input }]
};
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