pinafore/routes/_components/timeline/Timeline.html

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