mirror of
https://github.com/squidfunk/mkdocs-material.git
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134 lines
4.0 KiB
TypeScript
134 lines
4.0 KiB
TypeScript
/*
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* Copyright (c) 2016-2019 Martin Donath <martin.donath@squidfunk.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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import { equals } from "ramda"
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import { Observable, combineLatest } from "rxjs"
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import { distinctUntilChanged, map, shareReplay } from "rxjs/operators"
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import { ViewportOffset } from "../../ui"
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import { Container } from "../container"
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/* ----------------------------------------------------------------------------
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* Types
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* ------------------------------------------------------------------------- */
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/**
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* Sidebar
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*/
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export interface Sidebar {
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height: number /* Sidebar height */
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lock: boolean /* Sidebar lock */
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}
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/* ----------------------------------------------------------------------------
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* Function types
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* ------------------------------------------------------------------------- */
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/**
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* Watch options
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*/
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interface WatchOptions {
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container$: Observable<Container> /* Container observable */
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offset$: Observable<ViewportOffset> /* Viewport offset observable */
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}
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/* ----------------------------------------------------------------------------
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* Functions
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* ------------------------------------------------------------------------- */
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/**
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* Set sidebar height
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*
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* @param el - Sidebar element
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* @param height - Sidebar height
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*/
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export function setSidebarHeight(
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el: HTMLElement, height: number
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): void {
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el.style.height = `${height}px`
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}
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/**
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* Set sidebar lock
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*
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* @param el - Sidebar element
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* @param lock - Whether the sidebar is locked
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*/
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export function setSidebarLock(
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el: HTMLElement, lock: boolean
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): void {
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el.setAttribute("data-md-state", lock ? "lock" : "")
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}
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/**
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* Reset sidebar
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*
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* @param el - Sidebar element
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*/
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export function resetSidebar(el: HTMLElement): void {
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el.removeAttribute("data-md-state")
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el.style.height = ""
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}
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/* ------------------------------------------------------------------------- */
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/**
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* Create an observable to monitor the sidebar
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*
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* @param el - Sidebar element
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* @param options - Options
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*
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* @return Sidebar observable
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*/
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export function watchSidebar(
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el: HTMLElement, { container$, offset$ }: WatchOptions
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): Observable<Sidebar> {
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/* Adjust for internal container offset */
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const adjust = parseFloat(
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getComputedStyle(el.parentElement!)
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.getPropertyValue("padding-top")
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)
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/* Compute the sidebar's available height */
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const height$ = combineLatest(offset$, container$)
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.pipe(
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map(([{ y }, { offset, height }]) => {
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return height - adjust + Math.min(adjust, Math.max(0, y - offset))
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})
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)
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/* Compute whether the sidebar should be locked */
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const lock$ = combineLatest(offset$, container$)
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.pipe(
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map(([{ y }, { offset }]) => y >= offset + adjust)
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)
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/* Combine into single hot observable */
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return combineLatest(height$, lock$)
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.pipe(
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map(([height, lock]) => ({ height, lock })),
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distinctUntilChanged<Sidebar>(equals),
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shareReplay({ bufferSize: 1, refCount: true })
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)
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}
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