{"version":3,"file":"ui-vts-kit-ng-vts-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/ui-vts-kit-ng-vts-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 } from '@angular/cdk/platform';\nimport { DOCUMENT } from '@angular/common';\nimport {\n ChangeDetectionStrategy,\n ChangeDetectorRef,\n Component,\n EventEmitter,\n Inject,\n Input,\n NgZone,\n OnChanges,\n OnDestroy,\n OnInit,\n Optional,\n Output,\n SimpleChanges,\n TemplateRef,\n ViewEncapsulation\n} from '@angular/core';\nimport { fadeMotion } from '@ui-vts-kit/ng-vts/core/animation';\nimport { VtsConfigKey, VtsConfigService, WithConfig } from '@ui-vts-kit/ng-vts/core/config';\nimport { VtsScrollService } from '@ui-vts-kit/ng-vts/core/services';\nimport { NumberInput, VtsSafeAny } from '@ui-vts-kit/ng-vts/core/types';\nimport { InputNumber } from '@ui-vts-kit/ng-vts/core/util';\n\nimport { fromEvent, Subject } from 'rxjs';\nimport { takeUntil, throttleTime } from 'rxjs/operators';\n\nconst VTS_CONFIG_MODULE_NAME: VtsConfigKey = 'backTop';\n\n@Component({\n selector: 'vts-back-top',\n exportAs: 'vtsBackTop',\n animations: [fadeMotion],\n template: `\n \n \n
\n
\n \n
\n
\n \n \n \n `,\n changeDetection: ChangeDetectionStrategy.OnPush,\n encapsulation: ViewEncapsulation.None,\n preserveWhitespaces: false\n})\nexport class VtsBackTopComponent implements OnInit, OnDestroy, OnChanges {\n readonly _vtsModuleName: VtsConfigKey = VTS_CONFIG_MODULE_NAME;\n static ngAcceptInputType_vtsVisibilityHeight: NumberInput;\n static ngAcceptInputType_vtsDuration: NumberInput;\n\n private scrollListenerDestroy$ = new Subject();\n private destroy$ = new Subject();\n private target: HTMLElement | null = null;\n\n visible: boolean = false;\n dir: Direction = 'ltr';\n\n @Input() vtsTemplate?: TemplateRef;\n @Input() @WithConfig() @InputNumber() vtsVisibilityHeight: number = 400;\n @Input() vtsTarget?: string | HTMLElement;\n @Input() @InputNumber() vtsDuration: number = 450;\n @Output() readonly vtsClick: EventEmitter = new EventEmitter();\n\n constructor(\n @Inject(DOCUMENT) private doc: VtsSafeAny,\n public vtsConfigService: VtsConfigService,\n private scrollSrv: VtsScrollService,\n private platform: Platform,\n private cd: ChangeDetectorRef,\n private zone: NgZone,\n private cdr: ChangeDetectorRef,\n @Optional() 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$)).subscribe((direction: Direction) => {\n this.dir = direction;\n this.cdr.detectChanges();\n });\n\n this.dir = this.directionality.value;\n }\n\n clickBackTop(): void {\n this.scrollSrv.scrollTo(this.getTarget(), 0, {\n duration: this.vtsDuration\n });\n this.vtsClick.emit(true);\n }\n\n private getTarget(): HTMLElement | Window {\n return this.target || window;\n }\n\n private handleScroll(): void {\n if (this.visible === this.scrollSrv.getScroll(this.getTarget()) > this.vtsVisibilityHeight) {\n return;\n }\n this.visible = !this.visible;\n this.cd.detectChanges();\n }\n\n private registerScrollEvent(): void {\n if (!this.platform.isBrowser) {\n return;\n }\n this.scrollListenerDestroy$.next();\n this.handleScroll();\n this.zone.runOutsideAngular(() => {\n fromEvent(this.getTarget(), 'scroll')\n .pipe(throttleTime(50), takeUntil(this.scrollListenerDestroy$))\n .subscribe(() => this.handleScroll());\n });\n }\n\n ngOnDestroy(): void {\n this.scrollListenerDestroy$.next();\n this.scrollListenerDestroy$.complete();\n this.destroy$.next();\n this.destroy$.complete();\n }\n\n ngOnChanges(changes: SimpleChanges): void {\n const { vtsTarget } = changes;\n if (vtsTarget) {\n this.target =\n typeof this.vtsTarget === 'string'\n ? this.doc.querySelector(this.vtsTarget)\n : this.vtsTarget;\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 */\nimport { BidiModule } from '@angular/cdk/bidi';\nimport { PlatformModule } from '@angular/cdk/platform';\nimport { CommonModule } from '@angular/common';\nimport { NgModule } from '@angular/core';\nimport { VtsIconModule } from '@ui-vts-kit/ng-vts/icon';\n\nimport { VtsBackTopComponent } from './back-top.component';\n\n@NgModule({\n declarations: [VtsBackTopComponent],\n exports: [VtsBackTopComponent],\n imports: [BidiModule, CommonModule, PlatformModule, VtsIconModule]\n})\nexport class VtsBackTopModule {}\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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