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/*
* Copyright (c) 2016-2023 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,
Subject,
asyncScheduler,
defer,
finalize,
fromEvent,
map,
mergeMap,
observeOn,
of,
shareReplay,
startWith,
tap
} from "rxjs"
import { getElements } from "~/browser"
import { h } from "~/utilities"
import {
Component,
getComponentElement
} from "../_"
/* ----------------------------------------------------------------------------
* Types
* ------------------------------------------------------------------------- */
/**
* Palette colors
*/
export interface PaletteColor {
scheme?: string /* Color scheme */
primary?: string /* Primary color */
accent?: string /* Accent color */
}
/**
* Palette
*/
export interface Palette {
index: number /* Palette index */
color: PaletteColor /* Palette colors */
}
/* ----------------------------------------------------------------------------
* Functions
* ------------------------------------------------------------------------- */
/**
* Watch color palette
*
* @param inputs - Color palette element
*
* @returns Color palette observable
*/
export function watchPalette(
inputs: HTMLInputElement[]
): Observable<Palette> {
const current = __md_get<Palette>("__palette") || {
index: inputs.findIndex(input => matchMedia(
input.getAttribute("data-md-color-media")!
).matches)
}
/* Emit changes in color palette */
return of(...inputs)
.pipe(
mergeMap(input => fromEvent(input, "change")
.pipe(
map(() => input)
)
),
startWith(inputs[Math.max(0, current.index)]),
map(input => ({
index: inputs.indexOf(input),
color: {
scheme: input.getAttribute("data-md-color-scheme"),
primary: input.getAttribute("data-md-color-primary"),
accent: input.getAttribute("data-md-color-accent")
}
} as Palette)),
shareReplay(1)
)
}
/**
* Mount color palette
*
* @param el - Color palette element
*
* @returns Color palette component observable
*/
export function mountPalette(
el: HTMLElement
): Observable<Component<Palette>> {
const meta = h("meta", { name: "theme-color" })
document.head.appendChild(meta)
// Add color scheme meta tag
const scheme = h("meta", { name: "color-scheme" })
document.head.appendChild(scheme)
/* Mount component on subscription */
return defer(() => {
const push$ = new Subject<Palette>()
push$.subscribe(palette => {
document.body.setAttribute("data-md-color-switching", "")
/* Set color palette */
for (const [key, value] of Object.entries(palette.color))
document.body.setAttribute(`data-md-color-${key}`, value)
/* Toggle visibility */
for (let index = 0; index < inputs.length; index++) {
const label = inputs[index].nextElementSibling
if (label instanceof HTMLElement)
label.hidden = palette.index !== index
}
/* Persist preference in local storage */
__md_set("__palette", palette)
})
/* Update theme-color meta tag */
push$
.pipe(
map(() => {
const header = getComponentElement("header")
const style = window.getComputedStyle(header)
// Set color scheme
scheme.content = style.colorScheme
/* Return color in hexadecimal format */
return style.backgroundColor.match(/\d+/g)!
.map(value => (+value).toString(16).padStart(2, "0"))
.join("")
})
)
.subscribe(color => meta.content = `#${color}`)
/* Revert transition durations after color switch */
push$.pipe(observeOn(asyncScheduler))
.subscribe(() => {
document.body.removeAttribute("data-md-color-switching")
})
/* Create and return component */
const inputs = getElements<HTMLInputElement>("input", el)
return watchPalette(inputs)
.pipe(
tap(state => push$.next(state)),
finalize(() => push$.complete()),
map(state => ({ ref: el, ...state }))
)
})
}
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