Refactored header title component

src/assets/javascripts/actions/header/_/index.ts

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/* ----------------------------------------------------------------------------
+ * Functions
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Set header shadow
+ *
+ * @param el - Header element
+ * @param value - Whether the shadow is shown
+ */
+export function setHeaderShadow(
+  el: HTMLElement, value: boolean
+): void {
+  el.setAttribute("data-md-state", value ? "shadow" : "")
+}
+
+/**
+ * Reset header shadow
+ *
+ * @param el - Header element
+ */
+export function resetHeaderShadow(
+  el: HTMLElement
+): void {
+  el.removeAttribute("data-md-state")
+}

src/assets/javascripts/actions/header/index.ts

@@ -20,29 +20,5 @@
  * IN THE SOFTWARE.
  */
 
-/* ----------------------------------------------------------------------------
- * Functions
- * ------------------------------------------------------------------------- */
-
-/**
- * Set header shadow
- *
- * @param el - Header element
- * @param value - Whether the shadow is shown
- */
-export function setHeaderShadow(
-  el: HTMLElement, value: boolean
-): void {
-  el.setAttribute("data-md-state", value ? "shadow" : "")
-}
-
-/**
- * Reset header shadow
- *
- * @param el - Header element
- */
-export function resetHeaderShadow(
-  el: HTMLElement
-): void {
-  el.removeAttribute("data-md-state")
-}
+export * from "./_"
+export * from "./title"

src/assets/javascripts/actions/header/title/index.ts

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/* ----------------------------------------------------------------------------
+ * Functions
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Set header title
+ *
+ * @param el - Header title element
+ * @param value - Whether the title is shown
+ */
+export function setHeaderTitleActive(
+  el: HTMLElement, value: boolean
+): void {
+  el.setAttribute("data-md-state", value ? "active" : "")
+}
+
+/**
+ * Reset header title
+ *
+ * @param el - Header element
+ */
+export function resetHeaderTitleActive(
+  el: HTMLElement
+): void {
+  el.removeAttribute("data-md-state")
+}

src/assets/javascripts/components/header/_/index.ts

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+import { OperatorFunction, pipe } from "rxjs"
+import { shareReplay, switchMap } from "rxjs/operators"
+
+import { Header, watchHeader } from "observables"
+
+/* ----------------------------------------------------------------------------
+ * Functions
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Mount header from source observable
+ *
+ * @return Header observable
+ */
+export function mountHeader(): OperatorFunction<HTMLElement, Header> {
+  return pipe(
+    switchMap(watchHeader),
+    shareReplay(1)
+  )
+}

src/assets/javascripts/components/header/index.ts

@@ -20,23 +20,5 @@
  * IN THE SOFTWARE.
  */
 
-import { OperatorFunction, pipe } from "rxjs"
-import { shareReplay, switchMap } from "rxjs/operators"
-
-import { Header, watchHeader } from "observables"
-
-/* ----------------------------------------------------------------------------
- * Functions
- * ------------------------------------------------------------------------- */
-
-/**
- * Mount header from source observable
- *
- * @return Header observable
- */
-export function mountHeader(): OperatorFunction<HTMLElement, Header> {
-  return pipe(
-    switchMap(watchHeader),
-    shareReplay(1)
-  )
-}
+export * from "./_"
+export * from "./title"

src/assets/javascripts/components/header/title/index.ts

@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+import { Observable, OperatorFunction, pipe } from "rxjs"
+import { map, switchMap } from "rxjs/operators"
+
+import {
+  Header,
+  Viewport,
+  getElementOrThrow,
+  paintHeaderTitle,
+  watchViewportAt
+} from "observables"
+
+import { useComponent } from "../../_"
+
+/* ----------------------------------------------------------------------------
+ * Helper types
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Mount options
+ */
+interface MountOptions {
+  header$: Observable<Header>          /* Header observable */
+  viewport$: Observable<Viewport>      /* Viewport observable */
+}
+
+/* ----------------------------------------------------------------------------
+ * Functions
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Mount header title from source observable
+ *
+ * @param options - Options
+ *
+ * @return Header title observable
+ */
+export function mountHeaderTitle(
+  { header$, viewport$ }: MountOptions
+): OperatorFunction<HTMLElement, any> {
+  return pipe(
+    switchMap(el => useComponent("main")
+      .pipe(
+        map(main => getElementOrThrow("h1, h2, h3, h4, h5, h6", main)),
+        switchMap(headline => watchViewportAt(headline, { header$, viewport$ })
+          .pipe(
+            map(({ offset: { y } }) => y >= headline.offsetHeight),
+            paintHeaderTitle(el)
+          )
+        )
+      )
+    )
+  )
+}

src/assets/javascripts/components/hero/index.ts

@@ -27,7 +27,7 @@ import {
   Header,
   Viewport,
   paintHideable,
-  watchViewportFrom
+  watchViewportAt
 } from "observables"
 
 /* ----------------------------------------------------------------------------
@@ -68,7 +68,7 @@ export function mountHero(
   { header$, viewport$ }: MountOptions
 ): OperatorFunction<HTMLElement, Hero> {
   return pipe(
-    switchMap(el => watchViewportFrom(el, { header$, viewport$ })
+    switchMap(el => watchViewportAt(el, { header$, viewport$ })
       .pipe(
         paintHideable(el, 20),
         map(hidden => ({ hidden }))

src/assets/javascripts/components/search/index.ts

@@ -24,12 +24,7 @@ import { Observable, OperatorFunction, combineLatest, pipe } from "rxjs"
 import { map, shareReplay, switchMap } from "rxjs/operators"
 
 import { SearchResult } from "integrations/search"
-import {
-  Key,
-  SearchQuery,
-  Viewport,
-  WorkerHandler
-} from "observables"
+import { Key, SearchQuery, WorkerHandler } from "observables"
 import { SearchMessage } from "workers"
 
 import { useComponent } from "../_"
@@ -57,7 +52,6 @@ export interface Search {
  * Mount options
  */
 interface MountOptions {
-  viewport$: Observable<Viewport>      /* Viewport observable */
   keyboard$: Observable<Key>           /* Keyboard observable */
 }
 
@@ -74,7 +68,7 @@ interface MountOptions {
  * @return Search observable
  */
 export function mountSearch(
-  handler: WorkerHandler<SearchMessage>, { viewport$, keyboard$ }: MountOptions
+  handler: WorkerHandler<SearchMessage>, { keyboard$ }: MountOptions
 ): OperatorFunction<HTMLElement, Search> {
   return pipe(
     switchMap(() => {
@@ -88,14 +82,14 @@ export function mountSearch(
       /* Mount search query */
       const query$ = useComponent<HTMLInputElement>("search-query")
         .pipe(
-          mountSearchQuery(handler, { reset$ }),
+          mountSearchQuery(handler),
           shareReplay(1)
         )
 
       /* Mount search result */
       const result$ = useComponent("search-result")
         .pipe(
-          mountSearchResult(handler, { query$, viewport$, keyboard$ })
+          mountSearchResult(handler, { query$, keyboard$ })
         )
 
       /* Combine into a single hot observable */

src/assets/javascripts/components/search/result/index.ts

@@ -37,7 +37,6 @@ import { SearchResult } from "integrations/search"
 import {
   Key,
   SearchQuery,
-  Viewport,
   WorkerHandler,
   getActiveElement,
   getElements,
@@ -64,7 +63,6 @@ import { useComponent } from "../../_"
  */
 interface MountOptions {
   query$: Observable<SearchQuery>      /* Search query observable */
-  viewport$: Observable<Viewport>      /* Viewport observable */
   keyboard$: Observable<Key>           /* Keyboard observable */
 }
 
@@ -81,8 +79,7 @@ interface MountOptions {
  * @return Operator function
  */
 export function mountSearchResult(
-  { rx$ }: WorkerHandler<SearchMessage>,
-  { query$, viewport$, keyboard$ }: MountOptions
+  { rx$ }: WorkerHandler<SearchMessage>, { query$, keyboard$ }: MountOptions
 ): OperatorFunction<HTMLElement, SearchResult[]> {
   const toggle$ = useToggle("search")
   return pipe(
@@ -90,7 +87,7 @@ export function mountSearchResult(
       const container = el.parentElement!
 
       /* Compute whether there are more search results to fetch */
-      const fetch$ = watchElementOffset(container, { viewport$ })
+      const fetch$ = watchElementOffset(container)
         .pipe(
           map(({ y }) => {
             return y >= container.scrollHeight - container.offsetHeight - 16

src/assets/javascripts/components/tabs/index.ts

@@ -27,7 +27,7 @@ import {
   Header,
   Viewport,
   paintHideable,
-  watchViewportFrom
+  watchViewportAt
 } from "observables"
 
 /* ----------------------------------------------------------------------------
@@ -75,7 +75,7 @@ export function mountTabs(
 
           /* Mount tabs above screen breakpoint */
           if (screen) {
-            return watchViewportFrom(el, { header$, viewport$ })
+            return watchViewportAt(el, { header$, viewport$ })
               .pipe(
                 paintHideable(el, 10),
                 map(hidden => ({ hidden }))

src/assets/javascripts/index.ts

@@ -62,8 +62,7 @@ import {
   watchKeyboard,
   watchToggleMap,
   useToggle,
-  setViewportOffset,
-  watchViewportFrom,
+  watchViewportAt,
   getElementOrThrow
 } from "./observables"
 import { setupSearchWorker } from "./workers"
@@ -80,7 +79,8 @@ import {
   mountTableOfContents,
   mountTabs,
   useComponent,
-  watchComponentMap
+  watchComponentMap,
+  mountHeaderTitle
 } from "components"
 import { mountClipboard } from "./integrations/clipboard"
 import { patchTables, patchDetails } from "patches"
@@ -219,7 +219,7 @@ export function initialize(config: unknown) {
 
   const search$ = useComponent("search")
     .pipe(
-      mountSearch(worker, { viewport$, keyboard$ }),
+      mountSearch(worker, { keyboard$ }),
     )
 
   const navigation$ = useComponent("navigation")
@@ -242,24 +242,11 @@ export function initialize(config: unknown) {
       mountHero({ header$, viewport$ })
     )
 
-  /* Create header title toggle */
-  useComponent("main")
+  // TODO: make this part of mountHeader!?
+  const title$ = useComponent("header-title")
     .pipe(
-      map(el => getElementOrThrow("h1", el)), // catch error? just ignore?
-      switchMap(el => {
-        return watchViewportFrom(el, { header$, viewport$ })
-          .pipe(
-            map(({ offset: { y } }) => y >= el.offsetHeight),
-            withLatestFrom(useComponent("header-title")),
-            tap(([active, title]) => {
-              title.dataset.mdState = active ? "active" : ""
-            })
-          )
-      })
+      mountHeaderTitle({ header$, viewport$ })
     )
-      .subscribe()
-
-  // paintHeaderTitle <- same with shadow...
 
   /* ----------------------------------------------------------------------- */
 
@@ -385,7 +372,8 @@ export function initialize(config: unknown) {
     navigation$,
     toc$,
     tabs$,
-    hero$
+    hero$,
+    title$
   }
 
   const { ...rest } = state

src/assets/javascripts/observables/agent/document/switch/index.ts

@@ -52,7 +52,7 @@ interface WatchOptions {
  *
  * This function returns an observables that fetches a document if the provided
  * location observable emits a new value (i.e. URL). If the emitted URL points
- * to the same page, the request is effectively ignored (e.g. when only the
+ * to the same page, the request is effectively ignored (i.e. when only the
  * fragment identifier changes).
  *
  * @param options - Options

src/assets/javascripts/observables/agent/element/offset/index.ts

@@ -21,14 +21,7 @@
  */
 
 import { Observable, fromEvent, merge } from "rxjs"
-import {
-  distinctUntilKeyChanged,
-  map,
-  shareReplay,
-  startWith
-} from "rxjs/operators"
-
-import { Viewport } from "../../viewport"
+import { map, shareReplay, startWith } from "rxjs/operators"
 
 /* ----------------------------------------------------------------------------
  * Types
@@ -42,17 +35,6 @@ export interface ElementOffset {
   y: number                            /* Vertical offset */
 }
 
-/* ----------------------------------------------------------------------------
- * Helper types
- * ------------------------------------------------------------------------- */
-
-/**
- * Watch options
- */
-interface WatchOptions {
-  viewport$: Observable<Viewport>      /* Viewport observable */
-}
-
 /* ----------------------------------------------------------------------------
  * Functions
  * ------------------------------------------------------------------------- */
@@ -77,21 +59,16 @@ export function getElementOffset(el: HTMLElement): ElementOffset {
  * Watch element offset
  *
  * @param el - Element
- * @param options - Options
  *
  * @return Element offset observable
  */
 export function watchElementOffset(
-  el: HTMLElement, { viewport$ }: WatchOptions
+  el: HTMLElement
 ): Observable<ElementOffset> {
-  const scroll$ = fromEvent(el, "scroll")
-  const size$ = viewport$
-    .pipe(
-      distinctUntilKeyChanged("size")
-    )
-
-  /* Merge into a single hot observable */
-  return merge(scroll$, size$)
+  return merge(
+    fromEvent<UIEvent>(el, "scroll"),
+    fromEvent<UIEvent>(window, "resize")
+  )
     .pipe(
       map(() => getElementOffset(el)),
       startWith(getElementOffset(el)),

src/assets/javascripts/observables/agent/location/index.ts

@@ -36,8 +36,7 @@ export function watchLocation(): Subject<string> {
   const location$ = new Subject<string>()
   fromEvent<PopStateEvent>(window, "popstate")
     .pipe(
-      map(() => location.href),
-      share()
+      map(() => location.href)
     )
       .subscribe(location$)
 

src/assets/javascripts/observables/agent/viewport/_/index.ts

@@ -85,7 +85,7 @@ export function watchViewport(): Observable<Viewport> {
  *
  * @return Viewport observable
  */
-export function watchViewportFrom(
+export function watchViewportAt(
   el: HTMLElement, { header$, viewport$ }: WatchRelativeOptions
 ): Observable<Viewport> {
   return combineLatest([viewport$, header$])

src/assets/javascripts/observables/header/index.ts

@@ -22,3 +22,4 @@
 
 export * from "./_"
 export * from "./shadow"
+export * from "./title"

src/assets/javascripts/observables/header/title/index.ts

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2016-2020 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+import { animationFrameScheduler, pipe, MonoTypeOperatorFunction } from "rxjs"
+import { finalize, observeOn, tap } from "rxjs/operators"
+
+import { resetHeaderTitleActive, setHeaderTitleActive } from "actions"
+
+/* ----------------------------------------------------------------------------
+ * Functions
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Paint header title from source observable
+ *
+ * @param el - Header element
+ *
+ * @return Operator function
+ */
+export function paintHeaderTitle(
+  el: HTMLElement
+): MonoTypeOperatorFunction<boolean> {
+  return pipe(
+
+    /* Defer repaint to next animation frame */
+    observeOn(animationFrameScheduler),
+    tap(active => {
+      setHeaderTitleActive(el, active)
+    }),
+
+    /* Reset on complete or error */
+    finalize(() => {
+      resetHeaderTitleActive(el)
+    })
+  )
+}

src/assets/javascripts/workers/search/_/index.ts

@@ -85,7 +85,7 @@ export function setupSearchWorker(
   const worker = new Worker(url)
   const prefix = new URL(base, location.href)
 
-  /* Create communication channels and correct relative links */
+  /* Create communication channels and resolve relative links */
   const tx$ = new Subject<SearchMessage>()
   const rx$ = watchWorker(worker, { tx$ })
     .pipe(