/**
 *  Copyright 2020 Google LLC
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */ import { Injectable , Renderer2 , RendererFactory2 , Inject , ComponentFactoryResolver , Injector , ApplicationRef , EmbeddedViewRef , ComponentRef , EventEmitter , Type , OnDestroy } from '@angular/core' ; import { DOCUMENT } from '@angular/common' ; @ Injectable ( { providedIn : 'root' } ) export class DialogService implements OnDestroy { private readonly renderer : Renderer2 ; private dialog : HTMLElement ; private backdrop : HTMLElement ; private readonly componentCache = new Map < Type < any > , ComponentRef < void > > ( ) ; constructor ( rendererFactory , private readonly resolver , private readonly injector , private readonly appRef , @ Inject ( DOCUMENT ) private readonly document ) { this . renderer = rendererFactory . createRenderer ( null , null ) ; this . handleCloseDialog = this . handleCloseDialog . bind ( this ) ; } open ( component ) { let componentRef = this . componentCache . get ( component ) ; if ( ! componentRef ) { const componentFactory = this . resolver . resolveComponentFactory ( component ) ; componentRef = componentFactory . create ( this . injector ) ; this . componentCache . set ( component , componentRef ) ; this . appRef . attachView ( componentRef . hostView ) ; const closeDialog = ( componentRef . instance as any ) . closeDialog ; if ( closeDialog && closeDialog instanceof EventEmitter ) { ( closeDialog as EventEmitter < void > ) . subscribe ( ( ) => { this . close ( ) ; } ) ; } } if ( ! this . backdrop ) { this . backdrop = this . document . getElementById ( 'app-dialog-backdrop' ) ; } if ( ! this . dialog ) { this . dialog = this . document . getElementById ( 'app-dialog' ) ; this . dialog . addEventListener ( 'close-dialog' , this . handleCloseDialog , true ) ; } this . renderer . addClass ( this . backdrop , 'is-open' ) ; this . dialog . innerHTML = '' ; this . renderer . appendChild ( this . dialog , ( componentRef . hostView as EmbeddedViewRef < any > ) . rootNodes [ 0 ] ) ; } close ( ) { if ( ! this . backdrop ) { return ; } this . renderer . removeClass ( this . backdrop , 'is-open' ) ; this . dialog . dispatchEvent ( new CustomEvent ( 'dialog-closed' ) ) ; } handleCloseDialog ( ) { this . close ( ) ; } ngOnDestroy ( ) { if ( this . dialog ) { this . dialog . removeEventListener ( 'close-dialog' , this . handleCloseDialog ) ; } } }