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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,
defer,
distinctUntilKeyChanged,
finalize,
map,
of,
switchMap,
tap
} from "rxjs"
import { feature } from "~/_"
import {
Viewport,
watchElementSize,
watchViewportAt
} from "~/browser"
import { Component } from "../_"
import { Header } from "../header"
/* ----------------------------------------------------------------------------
* Types
* ------------------------------------------------------------------------- */
/**
* Navigation tabs
*/
export interface Tabs {
hidden: boolean /* Navigation tabs are hidden */
}
/* ----------------------------------------------------------------------------
* Helper types
* ------------------------------------------------------------------------- */
/**
* Watch options
*/
interface WatchOptions {
viewport$: Observable<Viewport> /* Viewport observable */
header$: Observable<Header> /* Header observable */
}
/**
* Mount options
*/
interface MountOptions {
viewport$: Observable<Viewport> /* Viewport observable */
header$: Observable<Header> /* Header observable */
}
/* ----------------------------------------------------------------------------
* Functions
* ------------------------------------------------------------------------- */
/**
* Watch navigation tabs
*
* @param el - Navigation tabs element
* @param options - Options
*
* @returns Navigation tabs observable
*/
export function watchTabs(
el: HTMLElement, { viewport$, header$ }: WatchOptions
): Observable<Tabs> {
return watchElementSize(document.body)
.pipe(
switchMap(() => watchViewportAt(el, { header$, viewport$ })),
map(({ offset: { y } }) => {
return {
hidden: y >= 10
}
}),
distinctUntilKeyChanged("hidden")
)
}
/**
* Mount navigation tabs
*
* This function hides the navigation tabs when scrolling past the threshold
* and makes them reappear in a nice CSS animation when scrolling back up.
*
* @param el - Navigation tabs element
* @param options - Options
*
* @returns Navigation tabs component observable
*/
export function mountTabs(
el: HTMLElement, options: MountOptions
): Observable<Component<Tabs>> {
return defer(() => {
const push$ = new Subject<Tabs>()
push$.subscribe({
/* Handle emission */
next({ hidden }) {
el.hidden = hidden
},
/* Handle complete */
complete() {
el.hidden = false
}
})
/* Create and return component */
return (
feature("navigation.tabs.sticky")
? of({ hidden: false })
: watchTabs(el, options)
)
.pipe(
tap(state => push$.next(state)),
finalize(() => push$.complete()),
map(state => ({ ref: el, ...state }))
)
})
}
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