{"version":3,"file":"ng-nest-ui-back-top.mjs","sources":["../../../../lib/ng-nest/ui/back-top/back-top.property.ts","../../../../lib/ng-nest/ui/back-top/back-top.component.ts","../../../../lib/ng-nest/ui/back-top/back-top.component.html","../../../../lib/ng-nest/ui/back-top/back-top.module.ts","../../../../lib/ng-nest/ui/back-top/ng-nest-ui-back-top.ts"],"sourcesContent":["import { XPropertyFunction, XToCssPixelValue, XToNumber } from '@ng-nest/ui/core';\r\nimport { TemplateRef, Component, input } from '@angular/core';\r\nimport type { XNumber } from '@ng-nest/ui/core';\r\n\r\n/**\r\n * BackTop\r\n * @selector x-back-top\r\n * @decorator component\r\n */\r\nexport const XBackTopPrefix = 'x-back-top';\r\nconst X_BACK_TOP_CONFIG_NAME = 'backTop';\r\n\r\n/**\r\n * BackTop Property\r\n */\r\n@Component({ selector: `${XBackTopPrefix}-property`, template: '' })\r\nexport class XBackTopProperty extends XPropertyFunction(X_BACK_TOP_CONFIG_NAME) {\r\n  /**\r\n   * @zh_CN 距离右边的距离\r\n   * @en_US Distance to the right\r\n   */\r\n  readonly right = input<string, XNumber>(this.config?.right ?? '2.5rem', { transform: XToCssPixelValue });\r\n  /**\r\n   * @zh_CN 距离底部的距离\r\n   * @en_US Distance from bottom\r\n   */\r\n  readonly bottom = input<string, XNumber>(this.config?.bottom ?? '2.5rem', { transform: XToCssPixelValue });\r\n  /**\r\n   * @zh_CN 滚动多少高度后显示\r\n   * @en_US Display after scrolling how much height\r\n   */\r\n  readonly visibilityHeight = input<number, XNumber>(this.config?.visibilityHeight ?? 200, { transform: XToNumber });\r\n  /**\r\n   * @zh_CN 内容模板\r\n   * @en_US Content template\r\n   */\r\n  readonly template = input<TemplateRef<any>>();\r\n  /**\r\n   * @zh_CN 滚动的元素\r\n   * @en_US Scroll element\r\n   */\r\n  readonly target = input<string | HTMLElement>();\r\n}\r\n","import {\r\n  Component,\r\n  ViewEncapsulation,\r\n  ChangeDetectionStrategy,\r\n  OnDestroy,\r\n  TemplateRef,\r\n  ViewContainerRef,\r\n  inject,\r\n  viewChild,\r\n  computed,\r\n  effect,\r\n  signal\r\n} from '@angular/core';\r\nimport { XBackTopPrefix, XBackTopProperty } from './back-top.property';\r\nimport { XRequestAnimationFrame, XIsNumber, XIsString } from '@ng-nest/ui/core';\r\nimport { DOCUMENT, NgTemplateOutlet } from '@angular/common';\r\nimport { fromEvent, Subject } from 'rxjs';\r\nimport { throttleTime, takeUntil, map, tap } from 'rxjs/operators';\r\nimport { XPortalService, XPortalOverlayRef } from '@ng-nest/ui/portal';\r\nimport { XLinkComponent } from '@ng-nest/ui/link';\r\n\r\n@Component({\r\n  selector: `${XBackTopPrefix}`,\r\n  imports: [NgTemplateOutlet, XLinkComponent],\r\n  templateUrl: './back-top.component.html',\r\n  styleUrls: ['./back-top.component.scss'],\r\n  encapsulation: ViewEncapsulation.None,\r\n  changeDetection: ChangeDetectionStrategy.OnPush\r\n})\r\nexport class XBackTopComponent extends XBackTopProperty implements OnDestroy {\r\n  backTopTpl = viewChild.required<TemplateRef<void>>('backTopTpl');\r\n  visiable = signal(false);\r\n  scrolling = signal(false);\r\n  portalRef!: XPortalOverlayRef<any>;\r\n  private doc = inject(DOCUMENT);\r\n  private portal = inject(XPortalService);\r\n  private viewContainerRef = inject(ViewContainerRef);\r\n  private unSubject = new Subject<void>();\r\n\r\n  scroll = computed(() => {\r\n    const tg = this.target();\r\n    if (!tg) return this.doc?.defaultView;\r\n    return XIsString(tg) ? this.doc?.querySelector(tg) : tg;\r\n  });\r\n\r\n  constructor() {\r\n    super();\r\n    effect(() => this.addEvent());\r\n  }\r\n\r\n  ngOnDestroy() {\r\n    this.unSubject.next();\r\n    this.unSubject.complete();\r\n  }\r\n\r\n  onBackTop() {\r\n    if (!this.scrolling()) {\r\n      this.scrolling.set(true);\r\n      this.scrollTo(0, 200);\r\n    }\r\n  }\r\n\r\n  private addEvent() {\r\n    this.unSubject.next();\r\n    fromEvent(this.scroll()!, 'scroll')\r\n      .pipe(\r\n        throttleTime(20),\r\n        map(() => this.scrollTop()),\r\n        tap((x) => this.setVisible(x)),\r\n        takeUntil(this.unSubject)\r\n      )\r\n      .subscribe();\r\n  }\r\n\r\n  private scrollTop() {\r\n    if (this.scroll() === this.doc.defaultView) {\r\n      return this.doc.documentElement.scrollTop;\r\n    } else {\r\n      return (this.scroll() as HTMLElement).scrollTop;\r\n    }\r\n  }\r\n\r\n  private setVisible(scrollTop: number) {\r\n    const visible = scrollTop >= (this.visibilityHeight() as number);\r\n    if (this.visiable() !== visible) {\r\n      this.visiable.set(visible);\r\n      if (this.visiable()) {\r\n        this.portalRef = this.portal.attach({\r\n          content: this.backTopTpl(),\r\n          viewContainerRef: this.viewContainerRef,\r\n          overlayConfig: {\r\n            width: '2.5rem',\r\n            height: '2.5rem',\r\n            positionStrategy: this.portal.setPlace('bottom-end', ...['0', this.right(), this.bottom(), '0'])\r\n          }\r\n        });\r\n      } else {\r\n        this.portalRef?.overlayRef?.hasAttached() && this.portalRef.overlayRef.detach();\r\n      }\r\n    }\r\n  }\r\n\r\n  private scrollTo(to: number, duration: number) {\r\n    const difference = to - this.scrollTop();\r\n    const perTick = (difference / duration) * 10;\r\n    XRequestAnimationFrame(() => {\r\n      const num = this.scrollTop() + perTick;\r\n      if (XIsNumber(num) && num !== Infinity) {\r\n        this.setScrollTop(num);\r\n      }\r\n      if (this.scrollTop() === to || duration <= 0) {\r\n        this.scrolling.set(false);\r\n        return;\r\n      } else {\r\n        this.scrollTo(to, duration - 10);\r\n      }\r\n    });\r\n  }\r\n\r\n  private setScrollTop(top: number) {\r\n    if (this.scroll() === this.doc.defaultView) {\r\n      this.doc.documentElement!.scrollTop = top!;\r\n    } else {\r\n      (this.scroll() as HTMLElement).scrollTop = top!;\r\n    }\r\n  }\r\n}\r\n","<ng-template #backTopTpl>\r\n  <div class=\"x-back-top\" (click)=\"onBackTop()\">\r\n    @if (!template()) {\r\n      <x-link icon=\"fto-arrow-up\"> </x-link>\r\n    }\r\n    @if (template()) {\r\n      <ng-container *ngTemplateOutlet=\"template()!\"></ng-container>\r\n    }\r\n  </div>\r\n</ng-template>\r\n","import { NgModule } from '@angular/core';\r\nimport { XBackTopComponent } from './back-top.component';\r\n@NgModule({\r\n  exports: [XBackTopComponent],\r\n  imports: [XBackTopComponent]\r\n})\r\nexport class XBackTopModule {}\r\n","/**\n * Generated bundle index. 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