Added navigation component

src/assets/javascripts/component/anchor/index.ts

@@ -34,7 +34,7 @@ import { ViewportOffset, getElement } from "../../ui"
  * Anchors
  */
 export interface Anchors {
-  done: HTMLAnchorElement[][]          /* Read anchors */
+  done: HTMLAnchorElement[][]          /* Done anchors */
   next: HTMLAnchorElement[][]          /* Next anchors */
 }
 
@@ -158,7 +158,10 @@ export function watchAnchors(
         /* Return partition */
         return [done, next]
       }, [[], [...table]]),
-      distinctUntilChanged((a, b) => a[0] === b[0] && a[1] === b[1])
+      distinctUntilChanged((a, b) => {
+        return a[0] === b[0]
+            && a[1] === b[1]
+      })
     )
 
   /* Extract anchors and return hot observable */

src/assets/javascripts/component/index.ts

@@ -23,4 +23,5 @@
 export * from "./anchor"
 export * from "./container"
 export * from "./header"
+export * from "./navigation"
 export * from "./sidebar"

src/assets/javascripts/component/navigation/index.ts

@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2016-2019 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, of } from "rxjs"
+import { shareReplay } from "rxjs/operators"
+
+import { getElement, getElements } from "../../ui"
+
+/* ----------------------------------------------------------------------------
+ * Types
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Navigation index
+ */
+export type NavigationIndex = Map<HTMLInputElement, HTMLElement>
+
+/* ----------------------------------------------------------------------------
+ * Functions
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Set navigation overflow scrolling
+ *
+ * @param nav - Navigation element
+ * @param active - Whether overflow scrolling is active
+ */
+export function setNavigationOverflowScrolling(
+  nav: HTMLElement, active: boolean
+): void {
+  nav.style.webkitOverflowScrolling = active ? "touch" : ""
+}
+
+/* ------------------------------------------------------------------------- */
+
+/**
+ * Create an observable to index all navigation elements
+ *
+ * @param nav - Top-level navigation element
+ *
+ * @return Navigation index observable
+ */
+export function watchNavigationIndex(
+  nav: HTMLElement
+): Observable<NavigationIndex> {
+  const list = getElements("nav", nav)
+
+  /* Build index to map inputs to navigation lists */
+  const index = new Map<HTMLInputElement, HTMLElement>()
+  for (const item of list) {
+    const label = getElement<HTMLLabelElement>("label", item)!
+    if (typeof label !== "undefined") {
+      const input = getElement<HTMLInputElement>(`#${label.htmlFor}`)!
+      index.set(input, item)
+    }
+  }
+
+  /* Return navigation index */
+  return of(index)
+    .pipe(
+      shareReplay({ bufferSize: 1, refCount: true })
+    )
+}

src/assets/javascripts/component/sidebar/index.ts

@@ -20,8 +20,9 @@
  * IN THE SOFTWARE.
  */
 
+import { equals } from "ramda"
 import { Observable, combineLatest } from "rxjs"
-import { map, shareReplay } from "rxjs/operators"
+import { distinctUntilChanged, map, shareReplay } from "rxjs/operators"
 
 import { ViewportOffset } from "../../ui"
 import { Container } from "../container"
@@ -112,8 +113,7 @@ export function watchSidebar(
   const height$ = combineLatest(offset$, container$)
     .pipe(
       map(([{ y }, { offset, height }]) => {
-        return height - adjust
+        return height - adjust + Math.min(adjust, Math.max(0, y - offset))
-          + Math.min(adjust, Math.max(0, y - offset))
       })
     )
 
@@ -127,6 +127,7 @@ export function watchSidebar(
   return combineLatest(height$, lock$)
     .pipe(
       map(([height, lock]) => ({ height, lock })),
+      distinctUntilChanged<Sidebar>(equals),
       shareReplay({ bufferSize: 1, refCount: true })
     )
 }