289 lines
No EOL
10 KiB
HTML
289 lines
No EOL
10 KiB
HTML
<h1 class="sr-only">{{label}}</h1>
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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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{{#if virtual}}
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<VirtualList component="{{VirtualListComponent}}"
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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="{{$timelineInitialized && $runningUpdate}}"
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footerComponent="{{LoadingFooter}}"
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showHeader="{{$showHeader}}"
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headerComponent="{{MoreHeaderVirtualWrapper}}"
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:headerProps
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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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{{else}}
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<!-- if this is a status thread, it's easier to just render the
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whole thing rather than use a virtual list -->
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<PseudoVirtualList
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component="{{VirtualListComponent}}"
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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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scrollToItem="{{scrollToItem}}"
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on:initialized="initialize()"
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/>
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{{/if}}
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</div>
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<script>
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import { store } from '../../_store/store'
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import StatusVirtualListItem from './StatusVirtualListItem.html'
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import NotificationVirtualListItem from './NotificationVirtualListItem.html'
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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 VirtualList from '../virtualList/VirtualList.html'
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import PseudoVirtualList from '../pseudoVirtualList/PseudoVirtualList.html'
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import { timelines } from '../../_static/timelines'
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import { database } from '../../_database/database'
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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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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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VirtualListComponent: (timelineType) => {
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return timelineType === 'notifications' ? NotificationVirtualListItem : StatusVirtualListItem
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},
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makeProps: ($currentInstance, timelineType, timelineValue) => async (itemId) => {
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let res = {
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timelineType,
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timelineValue
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}
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if (timelineType === 'notifications') {
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res.notification = await database.getNotification($currentInstance, itemId)
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} else {
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res.status = await database.getStatus($currentInstance, itemId)
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}
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return res
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},
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label: (timeline, $currentInstance, timelineType, timelineValue) => {
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if (timelines[timeline]) {
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return `${timelines[timeline].label} timeline for ${$currentInstance}`
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}
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switch (timelineType) {
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case 'tag':
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return `#${timelineValue} timeline for ${$currentInstance}`
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case 'status':
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return 'Status context'
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case 'account':
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return `Account #${timelineValue} on ${$currentInstance}`
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case 'list':
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return `List #${timelineValue} on ${$currentInstance}`
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case 'notifications':
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return `Notifications for ${$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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// 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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virtual: (timelineType) => timelineType !=='status',
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scrollToItem: (timelineType, timelineValue, $firstTimelineItemId) => {
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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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return timelineType === 'status'
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&& $firstTimelineItemId
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&& timelineValue !== $firstTimelineItemId
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&& timelineValue
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},
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itemIdsToAdd: ($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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components: {
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VirtualList,
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PseudoVirtualList
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},
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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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initialize() {
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if (this.get('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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if (!this.store.get('timelineInitialized') ||
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this.store.get('runningUpdate') ||
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this.get('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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fetchTimelineItemsOnScrollToBottom(
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this.store.get('currentInstance'),
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this.get('timeline')
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)
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},
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onScrollToTop() {
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if (this.store.get('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 instanceName = this.store.get('currentInstance')
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let timelineName = this.get('timeline')
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let handleItemIdsToAdd = () => {
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let itemIdsToAdd = this.get('itemIdsToAdd')
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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('scrollTop')
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let shouldShowHeader = this.store.get('shouldShowHeader')
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let showHeader = this.store.get('showHeader')
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if (timelineName.startsWith('status/')) {
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// this is a thread, just insert the statuses already
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showMoreItemsForThread(instanceName, timelineName)
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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(instanceName, timelineName)
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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(instanceName, timelineName, {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 instanceName = this.store.get('currentInstance')
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let timelineName = this.get('timeline')
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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(instanceName, timelineName, {
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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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if (this.store.get('ignoreBlurEvents')) {
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return
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}
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console.log('clearing focus')
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let instanceName = this.store.get('currentInstance')
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let timelineName = this.get('timeline')
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this.store.setForTimeline(instanceName, timelineName, {
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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('lastFocusedElementSelector')
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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> |