mirror of
https://github.com/squidfunk/mkdocs-material.git
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126 lines
3.8 KiB
TypeScript
126 lines
3.8 KiB
TypeScript
/*
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* Copyright (c) 2016-2022 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 {
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Observable,
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combineLatest,
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distinctUntilChanged,
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distinctUntilKeyChanged,
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map,
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switchMap
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} from "rxjs"
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import {
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Viewport,
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watchElementSize
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} from "~/browser"
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import { Header } from "../header"
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/* ----------------------------------------------------------------------------
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* Types
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* ------------------------------------------------------------------------- */
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/**
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* Main area
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*/
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export interface Main {
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offset: number /* Main area top offset */
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height: number /* Main area visible height */
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active: boolean /* Main area is active */
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}
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/* ----------------------------------------------------------------------------
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* Helper 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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viewport$: Observable<Viewport> /* Viewport observable */
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header$: Observable<Header> /* Header 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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* Watch main area
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*
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* This function returns an observable that computes the visual parameters of
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* the main area which depends on the viewport vertical offset and height, as
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* well as the height of the header element, if the header is fixed.
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*
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* @param el - Main area element
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* @param options - Options
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*
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* @returns Main area observable
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*/
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export function watchMain(
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el: HTMLElement, { viewport$, header$ }: WatchOptions
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): Observable<Main> {
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/* Compute necessary adjustment for header */
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const adjust$ = header$
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.pipe(
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map(({ height }) => height),
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distinctUntilChanged()
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)
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/* Compute the main area's top and bottom borders */
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const border$ = adjust$
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.pipe(
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switchMap(() => watchElementSize(el)
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.pipe(
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map(({ height }) => ({
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top: el.offsetTop,
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bottom: el.offsetTop + height
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})),
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distinctUntilKeyChanged("bottom")
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)
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)
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)
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/* Compute the main area's offset, visible height and if we scrolled past */
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return combineLatest([adjust$, border$, viewport$])
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.pipe(
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map(([header, { top, bottom }, { offset: { y }, size: { height } }]) => {
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height = Math.max(0, height
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- Math.max(0, top - y, header)
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- Math.max(0, height + y - bottom)
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)
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return {
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offset: top - header,
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height,
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active: top - header <= y
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}
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}),
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distinctUntilChanged((a, b) => (
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a.offset === b.offset &&
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a.height === b.height &&
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a.active === b.active
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))
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)
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}
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