299 lines
11 KiB
HTML
299 lines
11 KiB
HTML
<h1 class="sr-only">{label}</h1>
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<!-- for debugging
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<div style="padding:5px;position:fixed;left:0;top:0;z-index:999999999;font-size:0.9em;width: 75vw;background:rgba(0, 0, 0, 0.8);color:white;pointer-events:none;">
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<p>$timelineItemIds: {JSON.stringify(($timelineItemIds || []).map(_ => '...' + _.slice(-6)), null, ' ')}</p>
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<p>$itemIdsToAdd: {JSON.stringify(($itemIdsToAdd || []).map(_ => '...' + _.slice(-6)), null, ' ')}</p>
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<p>$runningUpdate: {$runningUpdate}</p>
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</div>
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-->
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<div class="timeline"
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role="feed"
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on:focusWithCapture="saveFocus(event)"
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on:blurWithCapture="clearFocus(event)"
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>
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{#await componentsPromise}
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<!-- awaiting promise -->
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{:then result}
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<svelte:component this={result.listComponent}
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component={result.listItemComponent}
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realm="{$currentInstance + '/' + timeline}"
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containerQuery=".container"
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{makeProps}
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items={$timelineItemIds}
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showFooter={true}
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footerComponent={LoadingFooter}
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showHeader={$showHeader}
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headerComponent={MoreHeaderVirtualWrapper}
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{headerProps}
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{scrollToItem}
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on:scrollToBottom="onScrollToBottom()"
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on:scrollToTop="onScrollToTop()"
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on:scrollTopChanged="onScrollTopChanged(event)"
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on:initialized="initialize()"
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on:noNeedToScroll="onNoNeedToScroll()"
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/>
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{:catch error}
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<div>Error: component failed to load! Try reloading. {error}</div>
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{/await}
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</div>
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<script>
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import { store } from '../../_store/store'
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import Status from '../status/Status.html'
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import LoadingFooter from './LoadingFooter.html'
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import MoreHeaderVirtualWrapper from './MoreHeaderVirtualWrapper.html'
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import {
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importVirtualList,
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importList,
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importStatusVirtualListItem,
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importNotificationVirtualListItem
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} from '../../_utils/asyncModules'
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import { timelines } from '../../_static/timelines'
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import {
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fetchTimelineItemsOnScrollToBottom,
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setupTimeline,
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showMoreItemsForTimeline,
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showMoreItemsForThread,
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showMoreItemsForCurrentTimeline
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} from '../../_actions/timeline'
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import { focusWithCapture, blurWithCapture } from '../../_utils/events'
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import { scheduleIdleTask } from '../../_utils/scheduleIdleTask'
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import { mark, stop } from '../../_utils/marks'
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import isEqual from 'lodash-es/isEqual'
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import { doubleRAF } from '../../_utils/doubleRAF'
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import { observe } from 'svelte-extras'
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import { createMakeProps } from '../../_actions/createMakeProps'
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export default {
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oncreate () {
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console.log('timeline oncreate()')
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this.setupFocus()
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setupTimeline()
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this.restoreFocus()
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this.setupStreaming()
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},
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ondestroy () {
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console.log('ondestroy')
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this.teardownFocus()
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},
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data: () => ({
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LoadingFooter,
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MoreHeaderVirtualWrapper,
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Status,
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scrollTop: 0
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}),
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computed: {
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// For threads, it's simpler to just render all items as a pseudo-virtual list
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// due to need to scroll to the right item and thus calculate all item heights up-front.
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// Here we lazy-load both the virtual list component itself as well as the component
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// it renders.
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componentsPromise: ({ timelineType }) => {
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return Promise.all([
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timelineType === 'status'
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? importList()
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: importVirtualList(),
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timelineType === 'notifications'
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? importNotificationVirtualListItem()
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: importStatusVirtualListItem()
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]).then(results => ({
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listComponent: results[0],
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listItemComponent: results[1]
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}))
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},
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makeProps: ({ $currentInstance, timelineType, timelineValue }) => (
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createMakeProps($currentInstance, timelineType, timelineValue)
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),
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label: ({ timeline, $currentInstance, timelineType, timelineValue }) => {
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if (timelines[timeline]) {
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return `Statuses: ${timelines[timeline].label} timeline on ${$currentInstance}`
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}
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switch (timelineType) {
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case 'tag':
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return `Statuses: #${timelineValue} hashtag`
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case 'status':
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return `Statuses: thread`
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case 'account':
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return `Statuses: account timeline`
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case 'list':
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return `Statuses: list`
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case 'notifications':
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return `Notifications on ${$currentInstance}`
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}
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},
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timelineType: ({ timeline }) => {
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return timeline.split('/')[0]
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},
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timelineValue: ({ timeline }) => {
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return timeline.split('/').slice(-1)[0]
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},
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// Scroll to the first item if this is a "status in own thread" timeline.
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// Don't scroll to the first item because it obscures the "back" button.
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scrollToItem: ({ timelineType, timelineValue, $firstTimelineItemId }) => (
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timelineType === 'status' && $firstTimelineItemId &&
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timelineValue !== $firstTimelineItemId && timelineValue
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),
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itemIdsToAdd: ({ $itemIdsToAdd }) => $itemIdsToAdd,
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headerProps: ({ itemIdsToAdd }) => {
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return {
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count: itemIdsToAdd ? itemIdsToAdd.length : 0,
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onClick: showMoreItemsForCurrentTimeline
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}
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}
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},
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store: () => store,
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events: {
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focusWithCapture,
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blurWithCapture
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},
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methods: {
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observe,
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initialize () {
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let { initializeStarted } = this.get()
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if (initializeStarted) {
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return
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}
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this.set({ initializeStarted: true })
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mark('initializeTimeline')
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doubleRAF(() => {
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console.log('timeline initialized')
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this.store.set({ timelineInitialized: true })
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stop('initializeTimeline')
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})
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},
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onScrollTopChanged (scrollTop) {
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this.set({ scrollTop: scrollTop })
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},
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onScrollToBottom () {
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let { timelineType } = this.get()
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let { timelineInitialized, runningUpdate } = this.store.get()
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if (!timelineInitialized ||
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runningUpdate ||
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timelineType === 'status') { // for status contexts, we've already fetched the whole thread
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return
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}
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let { currentInstance } = this.store.get()
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let { timeline } = this.get()
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fetchTimelineItemsOnScrollToBottom(
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currentInstance,
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timeline
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)
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},
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onScrollToTop () {
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let { shouldShowHeader } = this.store.get()
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if (shouldShowHeader) {
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this.store.setForCurrentTimeline({
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showHeader: true,
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shouldShowHeader: false
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})
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}
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},
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setupStreaming () {
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let { currentInstance } = this.store.get()
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let { timeline, timelineType } = this.get()
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let handleItemIdsToAdd = () => {
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let { itemIdsToAdd } = this.get()
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if (!itemIdsToAdd || !itemIdsToAdd.length) {
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return
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}
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mark('handleItemIdsToAdd')
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let { scrollTop } = this.get()
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let {
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shouldShowHeader,
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showHeader
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} = this.store.get()
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if (timelineType === 'status') {
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// this is a thread, just insert the statuses already
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showMoreItemsForThread(currentInstance, timeline)
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} else if (scrollTop === 0 && !shouldShowHeader && !showHeader) {
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// if the user is scrolled to the top and we're not showing the header, then
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// just insert the statuses. this is "chat room mode"
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showMoreItemsForTimeline(currentInstance, timeline)
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} else {
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// user hasn't scrolled to the top, show a header instead
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this.store.setForTimeline(currentInstance, timeline, { shouldShowHeader: true })
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}
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stop('handleItemIdsToAdd')
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}
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this.observe('itemIdsToAdd', (newItemIdsToAdd, oldItemIdsToAdd) => {
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if (!newItemIdsToAdd ||
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!newItemIdsToAdd.length ||
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isEqual(newItemIdsToAdd, oldItemIdsToAdd)) {
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return
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}
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scheduleIdleTask(handleItemIdsToAdd)
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})
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},
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setupFocus () {
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this.onPushState = this.onPushState.bind(this)
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this.store.setForCurrentTimeline({
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ignoreBlurEvents: false
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})
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window.addEventListener('pushState', this.onPushState)
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},
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teardownFocus () {
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window.removeEventListener('pushState', this.onPushState)
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},
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onPushState () {
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this.store.setForCurrentTimeline({ ignoreBlurEvents: true })
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},
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saveFocus (e) {
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try {
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let { currentInstance } = this.store.get()
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let { timeline } = this.get()
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let lastFocusedElementSelector
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let activeElement = e.target
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if (activeElement) {
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let focusKey = activeElement.getAttribute('focus-key')
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if (focusKey) {
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lastFocusedElementSelector = `[focus-key=${JSON.stringify(focusKey)}]`
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}
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}
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console.log('saving focus to ', lastFocusedElementSelector)
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this.store.setForTimeline(currentInstance, timeline, {
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lastFocusedElementSelector
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})
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} catch (err) {
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console.error('unable to save focus', err)
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}
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},
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clearFocus () {
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try {
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let { ignoreBlurEvents } = this.store.get()
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if (ignoreBlurEvents) {
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return
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}
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console.log('clearing focus')
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let { currentInstance } = this.store.get()
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let { timeline } = this.get()
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this.store.setForTimeline(currentInstance, timeline, {
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lastFocusedElementSelector: null
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})
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} catch (err) {
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console.error('unable to clear focus', err)
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}
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},
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restoreFocus () {
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let { lastFocusedElementSelector } = this.store.get()
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if (!lastFocusedElementSelector) {
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return
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}
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console.log('restoreFocus', lastFocusedElementSelector)
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requestAnimationFrame(() => {
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requestAnimationFrame(() => {
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let element = document.querySelector(lastFocusedElementSelector)
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if (element) {
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element.focus()
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}
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})
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})
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},
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onNoNeedToScroll () {
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// If the timeline doesn't need to scroll, then we can safely "preinitialize,"
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// i.e. render anything above the fold of the timeline. This avoids the affect
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// where the scrollable content appears to jump around if we need to scroll it.
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console.log('timeline preinitialized')
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this.store.set({ timelinePreinitialized: true })
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}
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}
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}
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</script> |