{"version":3,"file":"ng-zorro-antd-back-top.mjs","sources":["../../components/back-top/back-top.component.ts","../../components/back-top/back-top.module.ts","../../components/back-top/public-api.ts","../../components/back-top/ng-zorro-antd-back-top.ts"],"sourcesContent":["/**\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE\n */\n\nimport { Direction, Directionality } from '@angular/cdk/bidi';\nimport { Platform, normalizePassiveListenerOptions } from '@angular/cdk/platform';\nimport { DOCUMENT, NgTemplateOutlet } from '@angular/common';\nimport {\n  ChangeDetectionStrategy,\n  ChangeDetectorRef,\n  Component,\n  ElementRef,\n  EventEmitter,\n  Input,\n  NgZone,\n  OnChanges,\n  OnDestroy,\n  OnInit,\n  Output,\n  SimpleChanges,\n  TemplateRef,\n  ViewChild,\n  ViewEncapsulation,\n  inject,\n  numberAttribute\n} from '@angular/core';\nimport { Subject, Subscription } from 'rxjs';\nimport { debounceTime, takeUntil } from 'rxjs/operators';\n\nimport { fadeMotion } from 'ng-zorro-antd/core/animation';\nimport { NzConfigKey, NzConfigService, WithConfig } from 'ng-zorro-antd/core/config';\nimport { NzDestroyService, NzScrollService } from 'ng-zorro-antd/core/services';\nimport { fromEventOutsideAngular } from 'ng-zorro-antd/core/util';\nimport { NzIconModule } from 'ng-zorro-antd/icon';\n\nconst NZ_CONFIG_MODULE_NAME: NzConfigKey = 'backTop';\n\nconst passiveEventListenerOptions = normalizePassiveListenerOptions({ passive: true });\n\n@Component({\n  selector: 'nz-back-top',\n  exportAs: 'nzBackTop',\n  animations: [fadeMotion],\n  imports: [NgTemplateOutlet, NzIconModule],\n  template: `\n    @if (visible) {\n      <div #backTop class=\"ant-back-top\" [class.ant-back-top-rtl]=\"dir === 'rtl'\" @fadeMotion>\n        <ng-template #defaultContent>\n          <div class=\"ant-back-top-content\">\n            <div class=\"ant-back-top-icon\">\n              <nz-icon nzType=\"vertical-align-top\" />\n            </div>\n          </div>\n        </ng-template>\n        <ng-template [ngTemplateOutlet]=\"nzTemplate || defaultContent\"></ng-template>\n      </div>\n    }\n  `,\n  changeDetection: ChangeDetectionStrategy.OnPush,\n  encapsulation: ViewEncapsulation.None,\n  preserveWhitespaces: false,\n  providers: [NzDestroyService]\n})\nexport class NzBackTopComponent implements OnInit, OnDestroy, OnChanges {\n  readonly _nzModuleName: NzConfigKey = NZ_CONFIG_MODULE_NAME;\n\n  private scrollListenerDestroy$ = new Subject<boolean>();\n  private target: HTMLElement | null = null;\n\n  visible: boolean = false;\n  dir: Direction = 'ltr';\n\n  @Input() nzTemplate?: TemplateRef<void>;\n  @Input({ transform: numberAttribute }) @WithConfig() nzVisibilityHeight: number = 400;\n  @Input() nzTarget?: string | HTMLElement;\n  @Input({ transform: numberAttribute }) nzDuration: number = 450;\n  @Output() readonly nzClick = new EventEmitter<boolean>();\n\n  @ViewChild('backTop', { static: false })\n  set backTop(backTop: ElementRef<HTMLElement> | undefined) {\n    if (backTop) {\n      this.backTopClickSubscription.unsubscribe();\n\n      this.backTopClickSubscription = fromEventOutsideAngular(backTop.nativeElement, 'click')\n        .pipe(takeUntil(this.destroy$))\n        .subscribe(() => {\n          this.scrollSrv.scrollTo(this.getTarget(), 0, { duration: this.nzDuration });\n          if (this.nzClick.observers.length) {\n            this.zone.run(() => this.nzClick.emit(true));\n          }\n        });\n    }\n  }\n\n  private backTopClickSubscription = Subscription.EMPTY;\n  private doc: Document = inject(DOCUMENT);\n\n  constructor(\n    public nzConfigService: NzConfigService,\n    private scrollSrv: NzScrollService,\n    private platform: Platform,\n    private zone: NgZone,\n    private cdr: ChangeDetectorRef,\n    private destroy$: NzDestroyService,\n    private directionality: Directionality\n  ) {\n    this.dir = this.directionality.value;\n  }\n\n  ngOnInit(): void {\n    this.registerScrollEvent();\n\n    this.directionality.change?.pipe(takeUntil(this.destroy$)).subscribe((direction: Direction) => {\n      this.dir = direction;\n      this.cdr.detectChanges();\n    });\n\n    this.dir = this.directionality.value;\n  }\n\n  private getTarget(): HTMLElement | Window {\n    return this.target || window;\n  }\n\n  private handleScroll(): void {\n    if (this.visible === this.scrollSrv.getScroll(this.getTarget()) > this.nzVisibilityHeight) {\n      return;\n    }\n    this.visible = !this.visible;\n    this.cdr.detectChanges();\n  }\n\n  private registerScrollEvent(): void {\n    if (!this.platform.isBrowser) {\n      return;\n    }\n    this.scrollListenerDestroy$.next(true);\n    this.handleScroll();\n    fromEventOutsideAngular(this.getTarget(), 'scroll', passiveEventListenerOptions as AddEventListenerOptions)\n      .pipe(debounceTime(50), takeUntil(this.scrollListenerDestroy$))\n      .subscribe(() => this.handleScroll());\n  }\n\n  ngOnDestroy(): void {\n    this.scrollListenerDestroy$.next(true);\n    this.scrollListenerDestroy$.complete();\n  }\n\n  ngOnChanges(changes: SimpleChanges): void {\n    const { nzTarget } = changes;\n    if (nzTarget) {\n      this.target = typeof this.nzTarget === 'string' ? this.doc.querySelector(this.nzTarget) : this.nzTarget!;\n      this.registerScrollEvent();\n    }\n  }\n}\n","/**\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE\n */\n\nimport { NgModule } from '@angular/core';\n\nimport { NzBackTopComponent } from './back-top.component';\n\n@NgModule({\n  exports: [NzBackTopComponent],\n  imports: [NzBackTopComponent]\n})\nexport class NzBackTopModule {}\n","/**\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE\n */\n\nexport * from './back-top.component';\nexport * from './back-top.module';\n","/**\n * Generated bundle index. 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