{"version":3,"file":"ngwr-back-top.mjs","sources":["../../../projects/lib/back-top/back-top.ts","../../../projects/lib/back-top/back-top.html","../../../projects/lib/back-top/ngwr-back-top.ts"],"sourcesContent":["/**\n * @license\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/thekhegay/ngwr/blob/main/LICENSE\n */\n\nimport { coerceNumberProperty } from '@angular/cdk/coercion';\nimport { Component, DestroyRef, NgZone, ViewEncapsulation, computed, inject, input, signal } from '@angular/core';\n\nimport { WrPlatform } from 'ngwr/platform';\nimport { WrScroll } from 'ngwr/scroll';\n\n/**\n * Pinned floating button that scrolls the page back to the top. Appears\n * once the user has scrolled past `visibilityThreshold` pixels.\n *\n * @example\n * ```html\n * <wr-back-top />\n *\n * <wr-back-top visibilityThreshold=\"600\" [offset]=\"80\">\n *   <svg>…custom icon…</svg>\n * </wr-back-top>\n * ```\n *\n * @see https://ngwr.dev/components/back-top\n */\n@Component({\n  selector: 'wr-back-top',\n  templateUrl: './back-top.html',\n  encapsulation: ViewEncapsulation.None,\n  host: {\n    '[class]': 'classes()',\n    '[attr.aria-hidden]': '!visible()',\n  },\n})\nexport class WrBackTop {\n  /** Show the button once `window.scrollY` exceeds this many pixels. @default 400 */\n  readonly visibilityThreshold = input(400, {\n    transform: (v: unknown): number => Math.max(0, coerceNumberProperty(v, 400)),\n  });\n\n  /** Pixel offset subtracted from the scroll target — for sticky headers. @default 0 */\n  readonly offset = input(0, { transform: (v: unknown): number => Math.max(0, coerceNumberProperty(v, 0)) });\n\n  /** Accessible label for the button. @default 'Back to top' */\n  readonly ariaLabel = input<string>('Back to top');\n\n  protected readonly visible = signal(false);\n\n  private readonly scroll = inject(WrScroll);\n  private readonly platform = inject(WrPlatform);\n  private readonly zone = inject(NgZone);\n  private readonly destroyRef = inject(DestroyRef);\n\n  protected readonly classes = computed(() => {\n    const parts = ['wr-back-top'];\n    if (this.visible()) parts.push('wr-back-top--visible');\n    return parts.join(' ');\n  });\n\n  constructor() {\n    if (!this.platform.isBrowser) return;\n    const handler = (): void => {\n      const should = window.scrollY > this.visibilityThreshold();\n      if (should !== this.visible()) this.zone.run(() => this.visible.set(should));\n    };\n    this.zone.runOutsideAngular(() => window.addEventListener('scroll', handler, { passive: true }));\n    // Initial check (page might already be scrolled).\n    handler();\n    this.destroyRef.onDestroy(() => window.removeEventListener('scroll', handler));\n  }\n\n  protected onClick(): void {\n    this.scroll.toTop({ offset: this.offset() });\n  }\n}\n","<button type=\"button\" class=\"wr-back-top__button\" [attr.aria-label]=\"ariaLabel()\" (click)=\"onClick()\">\n  <svg width=\"18\" height=\"18\" viewBox=\"0 0 18 18\" aria-hidden=\"true\">\n    <path\n      d=\"M9 4 L9 14 M4 9 L9 4 L14 9\"\n      fill=\"none\"\n      stroke=\"currentColor\"\n      stroke-width=\"2\"\n      stroke-linecap=\"round\"\n      stroke-linejoin=\"round\"\n    />\n  </svg>\n  <ng-content />\n</button>\n","/**\n * Generated bundle index. 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