Added sidebar component implementation

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

@@ -34,10 +34,10 @@ import { toArray } from "../../utilities"
 /**
  * Container state
  */
-export interface ContainerState {
+export interface Container {
   offset: number                       /* Container top offset */
   height: number                       /* Container height */
-  active: boolean                      /* Scrolled past top */
+  active: boolean                      /* Scrolled past top offset */
 }
 
 /* ----------------------------------------------------------------------------
@@ -69,8 +69,8 @@ interface Options {
  * @return Container state observable
  */
 export function fromContainer(
-  container: HTMLElement, header: HTMLElement, options: Options
+  container: HTMLElement, header: HTMLElement, { size$, offset$ }: Options
-): Observable<ContainerState> {
+): Observable<Container> {
 
   /* Adjust top offset if header is fixed */
   const adjust = getComputedStyle(header)
@@ -79,7 +79,7 @@ export function fromContainer(
       : 0
 
   /* Compute the container's top offset */
-  const offset$ = options.size$.pipe(
+  const top$ = size$.pipe(
     map(() => reduce((offset, child) => {
       return Math.max(offset, child.offsetTop)
     }, 0, toArray(container.children)) - adjust),
@@ -88,7 +88,7 @@ export function fromContainer(
   )
 
   /* Compute the container's available height */
-  const height$ = combineLatest(options.offset$, options.size$, offset$).pipe(
+  const height$ = combineLatest(offset$, size$, top$).pipe(
     map(([{ y }, { height }, offset]) => {
       const bottom = container.offsetTop + container.offsetHeight
       return height - adjust
@@ -99,13 +99,13 @@ export function fromContainer(
   )
 
   /* Compute whether the viewport offset is past the container's top */
-  const active$ = combineLatest(options.offset$, offset$).pipe(
+  const active$ = combineLatest(offset$, top$).pipe(
     map(([{ y }, threshold]) => y >= threshold),
     distinctUntilChanged()
   )
 
   /* Combine into a single hot observable */
-  return combineLatest(offset$, height$, active$).pipe(
+  return combineLatest(top$, height$, active$).pipe(
     map(([offset, height, active]) => ({ offset, height, active })),
     shareReplay({ bufferSize: 1, refCount: true })
   )

src/assets/javascripts/component/index.ts

@@ -0,0 +1,24 @@
+/*
+ * 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.
+ */
+
+export * from "./container"
+export * from "./sidebar"

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

@@ -0,0 +1,142 @@
+/*
+ * 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 } from "rxjs"
+import {
+  filter,
+  finalize,
+  map,
+  shareReplay,
+  switchMap,
+  takeUntil
+} from "rxjs/operators"
+
+import { Container } from "../container"
+
+/* ----------------------------------------------------------------------------
+ * Types
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Sidebar state
+ */
+interface Sidebar {
+  height: number                       /* Sidebar height */
+  lock: boolean                        /* Sidebar lock */
+}
+
+/* ----------------------------------------------------------------------------
+ * Function types
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Options
+ */
+interface Options {
+  container$: Observable<Container>    /* Container state observable */
+  toggle$: Observable<boolean>         /* Toggle observable */
+}
+
+/* ----------------------------------------------------------------------------
+ * Functions
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Set sidebar height
+ *
+ * @param sidebar - Sidebar HTML element
+ * @param height - Sidebar height
+ */
+export function setSidebarHeight(sidebar: HTMLElement, height: number): void {
+  sidebar.style.height = `${height}px`
+}
+
+/**
+ * Unset sidebar height
+ *
+ * @param sidebar - Sidebar HTML element
+ */
+export function unsetSidebarHeight(sidebar: HTMLElement): void {
+  sidebar.style.height = ""
+}
+
+/* ------------------------------------------------------------------------- */
+
+/**
+ * Set sidebar lock
+ *
+ * @param sidebar - Sidebar HTML element
+ * @param lock - Sidebar lock
+ */
+export function setSidebarLock(sidebar: HTMLElement, lock: boolean): void {
+  sidebar.setAttribute("data-md-state", lock ? "lock" : "")
+}
+
+/**
+ * Unset sidebar lock
+ *
+ * @param sidebar - Sidebar HTML element
+ */
+export function unsetSidebarLock(sidebar: HTMLElement): void {
+  sidebar.removeAttribute("data-md-state")
+}
+
+/* ------------------------------------------------------------------------- */
+
+/**
+ * Create a observable for a sidebar component
+ *
+ * @param sidebar - Sidebar element
+ * @param options - Options
+ *
+ * @return Sidebar state observable
+ */
+export function fromSidebar(
+  sidebar: HTMLElement, { container$, toggle$ }: Options
+): Observable<Sidebar> {
+  const sidebar$ = toggle$.pipe(
+    filter(toggle => toggle === true),
+    switchMap(() => container$.pipe(
+      finalize(() => {
+        unsetSidebarHeight(sidebar)
+        unsetSidebarLock(sidebar)
+      }),
+      takeUntil(toggle$.pipe(
+        filter(toggle => toggle === false)
+      ))
+    )),
+    map<Container, Sidebar>(({ height, active }) => ({
+      height,
+      lock: active
+    })),
+    shareReplay({ bufferSize: 1, refCount: true })
+  )
+
+  /* Subscribe sidebar element */
+  sidebar$.subscribe(({ height, lock }) => {
+    setSidebarHeight(sidebar, height)
+    setSidebarLock(sidebar, lock)
+  })
+
+  /* Return sidebar observable */
+  return sidebar$
+}