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- {"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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