static/frontend/unit/unit.js.map

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  "sourcesContent": ["/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nconst headerHeight = 3.5;\nconst breadcumbHeight = 2.5;\n\n/**\n * MainLayoutController calculates dynamic height values for header elements\n * to support variable size sticky positioned elements in the header so that\n * banners and breadcumbs may overflow to multiple lines.\n */\nexport class MainLayoutController {\n  private headerObserver: IntersectionObserver;\n  private navObserver: IntersectionObserver;\n  private asideObserver: IntersectionObserver;\n\n  constructor(\n    private mainHeader?: Element | null,\n    private mainNav?: Element | null,\n    private mainAside?: Element | null\n  ) {\n    this.headerObserver = new IntersectionObserver(\n      ([e]) => {\n        if (e.intersectionRatio < 1) {\n          for (const x of document.querySelectorAll('[class^=\"go-Main-header\"')) {\n            x.setAttribute('data-fixed', 'true');\n          }\n        } else {\n          for (const x of document.querySelectorAll('[class^=\"go-Main-header\"')) {\n            x.removeAttribute('data-fixed');\n          }\n          this.handleResize();\n        }\n      },\n      { threshold: 1, rootMargin: `${breadcumbHeight * 16}px` }\n    );\n    this.navObserver = new IntersectionObserver(\n      ([e]) => {\n        if (e.intersectionRatio < 1) {\n          this.mainNav?.classList.add('go-Main-nav--fixed');\n          this.mainNav?.setAttribute('data-fixed', 'true');\n        } else {\n          this.mainNav?.classList.remove('go-Main-nav--fixed');\n          this.mainNav?.removeAttribute('data-fixed');\n        }\n      },\n      { threshold: 1, rootMargin: `-${headerHeight * 16 + 10}px` }\n    );\n    this.asideObserver = new IntersectionObserver(\n      ([e]) => {\n        if (e.intersectionRatio < 1) {\n          this.mainHeader?.setAttribute('data-raised', 'true');\n        } else {\n          this.mainHeader?.removeAttribute('data-raised');\n        }\n      },\n      { threshold: 1, rootMargin: `-${headerHeight * 16 + 20}px 0px 0px 0px` }\n    );\n    this.init();\n  }\n\n  private init() {\n    this.handleResize();\n    window.addEventListener('resize', this.handleResize);\n    this.mainHeader?.addEventListener('dblclick', this.handleDoubleClick);\n    if (this.mainHeader?.hasChildNodes()) {\n      const headerSentinel = document.createElement('div');\n      this.mainHeader.prepend(headerSentinel);\n      this.headerObserver.observe(headerSentinel);\n    }\n    if (this.mainNav?.hasChildNodes()) {\n      const navSentinel = document.createElement('div');\n      this.mainNav.prepend(navSentinel);\n      this.navObserver.observe(navSentinel);\n    }\n    if (this.mainAside) {\n      const asideSentinel = document.createElement('div');\n      this.mainAside.prepend(asideSentinel);\n      this.asideObserver.observe(asideSentinel);\n    }\n  }\n\n  private handleDoubleClick: EventListener = e => {\n    const target = e.target;\n    if (target === this.mainHeader?.lastElementChild) {\n      window.getSelection()?.removeAllRanges();\n      window.scrollTo({ top: 0, behavior: 'smooth' });\n    }\n  };\n\n  private handleResize = () => {\n    const setProp = (name: string, value: string) =>\n      document.documentElement.style.setProperty(name, value);\n    setProp('--js-unit-header-height', '0');\n    setTimeout(() => {\n      const mainHeaderHeight = (this.mainHeader?.getBoundingClientRect().height ?? 0) / 16;\n      setProp('--js-unit-header-height', `${mainHeaderHeight}rem`);\n      setProp('--js-sticky-header-height', `${headerHeight}rem`);\n      setProp('--js-unit-header-top', `${(mainHeaderHeight - headerHeight) * -1}rem`);\n    });\n  };\n}\n\nconst el = <T extends HTMLElement>(selector: string) => document.querySelector<T>(selector);\nnew MainLayoutController(el('.js-mainHeader'), el('.js-mainNav'), el('.js-mainAside'));\n"],
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