mirror of
https://github.com/squidfunk/mkdocs-material.git
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116 lines
3.4 KiB
TypeScript
116 lines
3.4 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, fromEvent, merge } from "rxjs"
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import { distinctUntilChanged, map, startWith } from "rxjs/operators"
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/* ----------------------------------------------------------------------------
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* Data
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* ------------------------------------------------------------------------- */
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/**
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* Observable for window scroll events
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*/
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const scroll$ = fromEvent<UIEvent>(window, "scroll")
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/**
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* Observable for window resize events
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*/
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const resize$ = fromEvent<UIEvent>(window, "resize")
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/* ----------------------------------------------------------------------------
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* Types
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* ------------------------------------------------------------------------- */
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/**
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* Viewport offset
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*/
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export interface ViewportOffset {
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x: number /* Horizontal offset */
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y: number /* Vertical offset */
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}
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/**
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* Viewport size
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*/
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export interface ViewportSize {
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width: number /* Viewport width */
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height: number /* Viewport height */
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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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* Retrieve the viewport offset
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*
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* @return Viewport offset
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*/
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export function getViewportOffset(): ViewportOffset {
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return {
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x: window.pageXOffset,
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y: window.pageYOffset
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}
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}
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/**
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* Retrieve the viewport size
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*
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* @return Viewport size
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*/
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export function getViewportSize(): ViewportSize {
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return {
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width: window.innerWidth,
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height: window.innerHeight
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}
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}
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/* ------------------------------------------------------------------------- */
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/**
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* Create an observable emitting changes in viewport offset
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*
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* @return Viewport offset observable
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*/
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export function fromViewportOffset(): Observable<ViewportOffset> {
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return merge(scroll$, resize$).pipe(
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map(getViewportOffset),
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startWith(getViewportOffset()),
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distinctUntilChanged<ViewportOffset>(equals)
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)
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}
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/**
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* Create an observable emitting changes in viewport size
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*
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* @return Viewport size observable
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*/
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export function fromViewportSize(): Observable<ViewportSize> {
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return resize$.pipe(
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map(getViewportSize),
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startWith(getViewportSize()),
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distinctUntilChanged<ViewportSize>(equals)
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)
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}
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