pinafore/routes/_components/timeline/Timeline.html

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<div class="timeline"
role="feed"
aria-label="{{label}}"
on:focusWithCapture="saveFocus(event)"
on:blurWithCapture="clearFocus(event)"
>
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{{#if !$initialized}}
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<LoadingPage />
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{{/if}}
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{{#if virtual}}
<VirtualList component="{{VirtualListComponent}}"
realm="{{$currentInstance + '/' + timeline}}"
containerQuery=".container"
:makeProps
items="{{$timelineItemIds}}"
shown="{{$initialized}}"
showFooter="{{$initialized && $runningUpdate}}"
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footerComponent="{{LoadingFooter}}"
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showHeader="{{$showHeader}}"
headerComponent="{{MoreHeaderVirtualWrapper}}"
:headerProps
on:scrollToBottom="onScrollToBottom()"
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on:scrollToTop="onScrollToTop()"
on:initializedVisibleItems="initialize()"
/>
{{else}}
<!-- if this is a status thread, it's easier to just render the
whole thing rather than use a virtual list -->
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<PseudoVirtualList component="{{VirtualListComponent}}"
realm="{{$currentInstance + '/' + timeline}}"
containerQuery=".container"
:makeProps
items="{{$timelineItemIds}}"
shown="{{$initialized}}"
scrollToItem="{{scrollToItem}}"
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on:initializedVisibleItems="initialize()"
/>
{{/if}}
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</div>
<style>
.timeline {
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min-height: 60vh;
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position: relative;
}
</style>
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<script>
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import { store } from '../../_store/store'
import StatusVirtualListItem from './StatusVirtualListItem.html'
import NotificationVirtualListItem from './NotificationVirtualListItem.html'
import Status from '../status/Status.html'
import PseudoVirtualList from '../pseudoVirtualList/PseudoVirtualList.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'
import { timelines } from '../../_static/timelines'
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import { database } from '../../_database/database'
import { initializeTimeline, fetchTimelineItemsOnScrollToBottom, setupTimeline } from '../../_actions/timeline'
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import LoadingPage from '../LoadingPage.html'
import { focusWithCapture, blurWithCapture } from '../../_utils/events'
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import { showMoreItemsForCurrentTimeline } from '../../_actions/timeline'
import { virtualListStore } from '../virtualList/virtualListStore' // TODO: hacky, need better way to expose scrollTop
import { scheduleIdleTask } from '../../_utils/scheduleIdleTask'
import { mark, stop } from '../../_utils/marks'
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export default {
oncreate() {
console.log('timeline oncreate()')
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this.setupFocus()
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setupTimeline()
if (this.store.get('initialized')) {
this.restoreFocus()
}
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this.setupStreaming()
},
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,
Status
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}),
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computed: {
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VirtualListComponent: (timelineType) => {
return timelineType === 'notifications' ? NotificationVirtualListItem : StatusVirtualListItem
},
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
},
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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) {
case 'tag':
return `#${timelineValue} timeline for ${$currentInstance}`
case 'status':
return 'Status context'
case 'account':
return `Account #${timelineValue} on ${$currentInstance}`
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case 'list':
return `List #${timelineValue} on ${$currentInstance}`
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}
},
timelineType: (timeline) => {
return timeline.split('/')[0]
},
timelineValue: (timeline) => {
return timeline.split('/').slice(-1)[0]
},
// 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
virtual: (timelineType) => timelineType !=='status',
scrollToItem: (timelineType, timelineValue, $firstTimelineItemId) => {
// 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.
return timelineType === 'status'
&& $firstTimelineItemId
&& timelineValue !== $firstTimelineItemId
&& timelineValue
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},
itemIdsToAdd: ($itemIdsToAdd) => $itemIdsToAdd,
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// TODO: hack to avoid getting called too often
itemIdsToAddStringified: (itemIdsToAdd) => JSON.stringify(itemIdsToAdd),
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headerProps: (itemIdsToAdd) => {
return {
count: (itemIdsToAdd && itemIdsToAdd.length) || 0,
onClick: showMoreItemsForCurrentTimeline
}
}
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},
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store: () => store,
components: {
VirtualList,
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PseudoVirtualList,
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LoadingPage
},
events: {
focusWithCapture,
blurWithCapture
},
methods: {
initialize() {
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if (this.get('initializeStarted')) {
return
}
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this.set({initializeStarted: true})
console.log('timeline initialize()')
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initializeTimeline()
},
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onScrollToBottom() {
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if (!this.store.get('initialized') ||
this.store.get('runningUpdate') ||
this.get('timelineType') === 'status') { // for status contexts, we've already fetched the whole thread
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return
}
fetchTimelineItemsOnScrollToBottom()
},
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onScrollToTop() {
if (this.store.get('shouldShowHeader')) {
this.store.setForCurrentTimeline({
showHeader: true,
shouldShowHeader: false
})
}
},
setupStreaming() {
let instanceName = this.store.get('currentInstance')
let timelineName = this.get('timeline')
let handleItemIdsToAdd = () => {
let itemIdsToAdd = this.get('itemIdsToAdd')
if (!itemIdsToAdd || !itemIdsToAdd.length) {
return
}
mark('handleItemIdsToAdd')
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let scrollTop = virtualListStore.get('scrollTop')
let shouldShowHeader = this.store.get('shouldShowHeader')
let showHeader = this.store.get('showHeader')
//console.log('handleItemIdsToAdd', (itemIdsToAdd && itemIdsToAdd.length) || 0)
if (scrollTop === 0 && !shouldShowHeader && !showHeader) {
// 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"
showMoreItemsForCurrentTimeline()
} else {
// user hasn't scrolled to the top, show a header instead
this.store.setForTimeline(instanceName, timelineName, {shouldShowHeader: true})
}
stop('handleItemIdsToAdd')
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}
this.observe('itemIdsToAddStringified', itemIdsToAddStringified => {
scheduleIdleTask(handleItemIdsToAdd)
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})
},
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setupFocus() {
this.onPushState = this.onPushState.bind(this)
this.store.setForCurrentTimeline({ignoreBlurEvents: false})
window.addEventListener('pushState', this.onPushState)
},
teardownFocus() {
window.removeEventListener('pushState', this.onPushState)
},
onPushState() {
this.store.setForCurrentTimeline({ ignoreBlurEvents: true })
},
saveFocus(e) {
let instanceName = this.store.get('currentInstance')
let timelineName = this.get('timeline')
let lastFocusedElementSelector
let activeElement = e.target
if (activeElement) {
let focusKey = activeElement.getAttribute('focus-key')
if (focusKey) {
lastFocusedElementSelector = `[focus-key=${focusKey}]`
}
}
console.log('saving focus to ', lastFocusedElementSelector)
this.store.setForTimeline(instanceName, timelineName, {
lastFocusedElementSelector
})
},
clearFocus() {
if (this.store.get('ignoreBlurEvents')) {
return
}
console.log('clearing focus')
let instanceName = this.store.get('currentInstance')
let timelineName = this.get('timeline')
this.store.setForTimeline(instanceName, timelineName, {
lastFocusedElementSelector: null
})
},
restoreFocus() {
let lastFocusedElementSelector = this.store.get('lastFocusedElementSelector')
console.log('lastFocused', lastFocusedElementSelector)
if (lastFocusedElementSelector) {
requestAnimationFrame(() => {
requestAnimationFrame(() => {
let element = document.querySelector(lastFocusedElementSelector)
console.log('el', element)
if (element) {
element.focus()
}
})
})
}
},
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}
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}
</script>