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scroll scroll scroll

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This commit is contained in:
Henry Jameson 2026-09-16 00:05:46 +03:00
commit 45213f07c6
8 changed files with 230 additions and 107 deletions
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90
src/components/conversation/conversation.js
View file

@ -7,6 +7,7 @@ import {
toRefs,
useTemplateRef,
watch,
nextTick,
} from 'vue'
import { useRouter } from 'vue-router'
@ -65,22 +66,11 @@ export default {
PostStatusForm,
RichContent,
},
emits: ['heightChange', 'suspendableStateChange'],
emits: ['heightChange', 'suspendableStateChange', 'expanded', 'collapsed'],
setup(props, { emit }) {
const router = useRouter()
const scroller = useScrollPosition()
const tryScrollTo = async (id) => {
if (!id) {
return
}
if (isPage.value) {
router.push({ name: 'conversation', params: { statusId: id } })
}
setFocused(id)
const target = document.querySelector(`.Status[data-status-id="${id}"]`)
return await scroller.scrollIntoView(target, { block: 'nearest' })
}
const { statusId } = toRefs(props)
// # Main Configuration / global state
const { mergedConfig } = storeToRefs(useMergedConfigStore())
@ -92,17 +82,27 @@ export default {
const expanded = ref(false)
const { isPage } = toRefs(props)
const isExpanded = computed(() => !!(expanded.value || isPage.value))
const toggleExpanded = () => {
expanded.value = !expanded.value
const toggleExpanded = async () => {
const newVal = !expanded.value
if (newVal) {
virtualScrollingEnabled.value = newVal
await nextTick()
expanded.value = newVal
} else {
expanded.value = newVal
await nextTick()
virtualScrollingEnabled.value = newVal
}
}
provide('isExpanded', isExpanded)
provide('isPage', isPage)
provide('expandable', true)
watch(expanded, (val) => val ? emit('expanded') : emit('collapsed'), { flush: 'post' })
// # Main things
const { statusId } = toRefs(props)
const {
focusedId,
conversationId,
setFocused,
currentStatus,
mainStatus,
@ -115,12 +115,13 @@ export default {
const conversationLite = computed(() =>
conversation.value.map(({ id }) => ({ id })),
)
const mainStatusId = computed(() => mainStatus.value.id)
watch(
expanded,
async (value) => {
(value) => {
if (value) {
await fetchConversation()
fetchConversation()
}
},
{ flush: 'post' },
@ -154,8 +155,15 @@ export default {
() => !isExpanded.value && unsuspendableIds.value.size === 0,
)
const rootElement = useTemplateRef('root')
const rootElementMargin = ref(null)
const updateVirtualHeight = (e) => {
const [entry] = e
const rootCss = window.getComputedStyle(rootElement.value)
const rootMarginString = rootCss.getPropertyValue('margin-top')
const rootMargin = Number.parseInt(rootMarginString.slice(0, -2), 10)
rootElementMargin.value = rootMargin
emit('heightChange', {
id: statusId.value,
height: entry.contentRect.height,
@ -168,15 +176,27 @@ export default {
emit('suspendableStateChange', { suspend: value, id: statusId.value }),
)
onUnmounted(() => resizeObserver.value.disconnect())
// Internal virtual scrolling
const virtualScrollingEnabled = ref(isExpanded.value)
// Placeholder heights.
const { fontSize } = useInterfaceSizes()
const { fontSize, navbarSize, panelHeaderSize } = useInterfaceSizes()
const mutedStatusHeight = computed(() => fontSize.value * 1.5)
const normalStatusHeight = computed(() => fontSize.value * 10)
const getPlaceholderHeight = (id) =>
conversation.value.find((item) => item.id === id)?.muted
? mutedStatusHeight
: normalStatusHeight
const offset = computed(() => {
// The fontsize after navbar is the little gap between navbar and content
if (isPage.value) {
return navbarSize.value + fontSize.value + panelHeaderSize.value
} else if (expanded.value) {
return navbarSize.value + fontSize.value + panelHeaderSize.value * 2 + rootElementMargin.value
} else {
return navbarSize.value + fontSize.value
}
})
const anchorIds = computed(
() => new Set([mainStatus.value?.id, currentStatus.value?.id]),
@ -186,17 +206,20 @@ export default {
const isLinearView = computed(() => displayStyle.value !== 'tree')
const linearElement = useTemplateRef('linear')
const linearScrollCompensation = computed(
() => isExpanded.value && isLinearView.value,
() => virtualScrollingEnabled.value && isLinearView.value,
)
const {
heightChart: heightChartLinear,
changeSuspendState: changeSuspendStateLinear,
updateVirtualHeight: updateVirtualHeightLinear,
reset: resetLinearScrollVirtualization,
scrollTo: linearScrollTo,
} = useVirtualScrolling({
context: statusId,
name: 'Linear',
enabled: linearScrollCompensation,
list: conversationLite,
body: linearElement,
offset,
scrollPositionInstance: scroller,
scrollCompensation: linearScrollCompensation,
anchorIds,
@ -236,17 +259,20 @@ export default {
)
const ancestorsElement = useTemplateRef('ancestors')
const treeScrollCompensation = computed(
() => isExpanded.value && isTreeView.value,
() => virtualScrollingEnabled.value && isTreeView.value,
)
const {
heightChart: heightChartAncestors,
changeSuspendState: changeSuspendStateAncestors,
updateVirtualHeight: updateVirtualHeightAncestors,
reset: resetTreeScrollVirtualization,
scrollTo: treeScrollTo,
} = useVirtualScrolling({
context: statusId,
name: 'Ancestors',
enabled: treeScrollCompensation,
list: currentAncestorsLite,
body: ancestorsElement,
offset,
scrollPositionInstance: scroller,
scrollCompensation: treeScrollCompensation,
collapseMode: 'height',
@ -271,11 +297,12 @@ export default {
}
}
watch(statusId, (neu, old) => {
watch(conversationId, (neu, old) => {
resetLinearScrollVirtualization()
resetTreeScrollVirtualization()
})
const treeViewIsSimple = computed(
() => !mergedConfig.value.conversationTreeAdvanced,
)
@ -287,8 +314,19 @@ export default {
)
// # Scrolling
const diveIntoStatus = (id) => tryScrollTo(id)
const diveToTopLevel = () => tryScrollTo(currentAncestors.value[0].id)
const scrollTo = (ids) => {
if (isTreeView.value) {
return treeScrollTo(ids)
} else {
return linearScrollTo(ids)
}
}
const diveIntoStatus = (id) => scrollTo(new Set([id]))
const diveToTopLevel = () => scrollTo(new Set([currentAncestors.value[0].id]))
watch(focusedId, async (neu) => {
if (!isPage.value) return
if (neu) scrollTo(new Set([neu]))
})
return {
// # Misc

1
src/components/conversation/conversation.vue
View file

@ -6,6 +6,7 @@
>
<div
v-if="isExpanded"
ref="panelHeader"
class="panel-heading conversation-heading -sticky"
>
<h1 class="title">

22
src/components/timeline/timeline.js
View file

@ -8,6 +8,7 @@ import {
toRefs,
useTemplateRef,
watch,
nextTick,
} from 'vue'
import { useI18n } from 'vue-i18n'
@ -69,7 +70,7 @@ const Timeline = {
})
// Virtual scrolling
const { fontSize } = useInterfaceSizes()
const { fontSize, navbarSize, panelHeaderSize } = useInterfaceSizes()
// Placeholder heights.
const mutedStatusHeight = computed(() => fontSize.value * 1.5)
@ -80,12 +81,27 @@ const Timeline = {
: normalStatusHeight
const body = useTemplateRef('timeline')
const { heightChart, changeSuspendState, updateVirtualHeight } =
const offset = computed(() => {
if (embedded.value) {
// The fontsize after navbar is the little gap between navbar and content
return navbarSize.value + fontsize.value
} else {
return 0
}
})
const {
heightChart,
changeSuspendState,
updateVirtualHeight,
} =
useVirtualScrolling({
name: 'Timeline',
enabled: ref(true),
list: filteredVisibleStatuses,
body,
offset,
scrollPositionInstance: useScrollPosition(),
scrollCompensation: false,
scrollCompensation: ref(false),
getPlaceholderHeight,
})

25
src/composables/useConversation.js
View file

@ -17,6 +17,7 @@ import { WSConnectionStatus } from 'src/api/websocket.js'
export function useConversation(statusId, expanded) {
const loadError = ref(null)
const { status: currentStatus, mainStatus } = useMainStatus(statusId)
const mainStatusId = computed(() => mainStatus.value?.id)
// # Config
const { mergedConfig } = storeToRefs(useMergedConfigStore())
@ -28,16 +29,23 @@ export function useConversation(statusId, expanded) {
)
// # Focus
const focusedId = ref(null)
const { mainStatus: focusedStatus } = useMainStatus(focusedId)
const focused = ref(null)
const { mainStatus: focusedStatus } = useMainStatus(focused)
const setFocused = (id) => {
focusedId.value = id
focused.value = id
}
watch(mainStatusId, (val) => setFocused(val))
const focusedId = computed(() => expanded.value ? focusedStatus.value?.id : null)
provide('focusedId', focusedId)
watch(mainStatus, (newStatus, oldStatus) => {
if (newStatus) setFocused(newStatus.id)
if (newStatus.id !== oldStatus.id) {
watch(statusId, (neu, old) => {
console.log('focused', neu)
if (neu) setFocused(neu)
console.log('focusedid', focusedId.value)
}, { immediate: true })
watch(statusId, (neu, old) => {
if (neu !== old) {
fetchConversation()
}
})
@ -45,7 +53,7 @@ export function useConversation(statusId, expanded) {
watch(
expanded,
(value) => {
setFocused(value ? statusId.value : null)
setFocused(value ? mainStatusId.value : null)
},
{ immediate: true },
)
@ -83,7 +91,7 @@ export function useConversation(statusId, expanded) {
}
}
const conversationId = computed(
() => mainStatus.value.statusnet_conversation_id,
() => mainStatus.value?.statusnet_conversation_id,
)
const conversation = computed(() => {
if (!currentStatus.value) {
@ -159,6 +167,7 @@ export function useConversation(statusId, expanded) {
return {
focusedId,
conversationId,
setFocused,
currentStatus,
mainStatus,

2
src/composables/useInterfaceSizes.js
View file

@ -21,7 +21,6 @@ export function useInterfaceSizes() {
const navbarSize = computed(() => {
const string =
fontSize.value *
window.getComputedStyle(document.body).getPropertyValue('--navbarSize')
return fontSize.value * Number.parseInt(string.slice(0, -3), 10) // remove the 'rem'
@ -29,7 +28,6 @@ export function useInterfaceSizes() {
const panelHeaderSize = computed(() => {
const string =
fontSize.value *
window
.getComputedStyle(document.body)
.getPropertyValue('--panelHeaderSize')

8
src/composables/useMainStatus.js
View file

@ -1,14 +1,16 @@
import { computed, toValue } from 'vue'
import { storeToRefs } from 'pinia'
import { useStatusesStore } from 'src/stores/statuses.js'
export function useMainStatus(statusId) {
const getStatusObject = (id) => useStatusesStore().allStatuses.get(id)
const statusesStore = storeToRefs(useStatusesStore())
const getStatusObject = (id) => statusesStore.allStatuses.value.get(id)
const status = computed(() => getStatusObject(toValue(statusId)))
const status = computed(() => getStatusObject(statusId.value))
const mainStatus = computed(() => {
if (!status.value) return
if (!status.value) return null
const retweetedStatusId = status.value.retweeted_status?.id
if (retweetedStatusId) {
return getStatusObject(retweetedStatusId)

7
src/composables/useScrollPosition.js
View file

@ -20,9 +20,9 @@ export function useScrollPosition() {
window.removeEventListener('scroll', update)
})
const scrollBy = async (x1, y1, options) => {
const scrollBy = async (...args) => {
inProgress.value = true
await window.scrollBy(x1, y1, options)
await window.scrollBy(...args)
inProgress.value = false
}
@ -40,8 +40,9 @@ export function useScrollPosition() {
if (aboveTop || belowBottom || biggerThanScreen) {
await element.scrollIntoView(options)
}
} else {
await element.scrollIntoViewIfNeeded(options)
}
await element.scrollIntoViewIfNeeded(options)
inProgress.value = false
}

182
src/composables/useVirtualScrolling.js
View file

@ -4,17 +4,21 @@ import { computed, nextTick, ref, toValue, watch } from 'vue'
import { useWindowSize } from 'src/composables/useWindowSize.js'
export function useVirtualScrolling({
// For debugging
name = 'Generic',
// Master toggle
enabled,
// List of items
list,
// Container of items, used for measuring scroll position
body,
// vertical offset to account for fixed and sticky headers
offset,
// useScrollPosition composable, used to prevent dupicating instances
scrollPositionInstance,
// buffer zone, the amount of placeholder heights to include
buffer,
// whether to use scroll compensation when elements above anchor change
// set to 'positive' to only compensate for positive increase (useful when
// combined with infinite scroll)
scrollCompensation,
// How to handle collapse/expansion (going from 0 elements to full and back)
// - false - don't do scroll compensation at all
@ -56,7 +60,7 @@ export function useVirtualScrolling({
})()
const suspendable = !unsuspendibleIds.value.has(id)
const real = heights.value.has(id)
return { id, height, suspendable, real }
return { id, height, suspendable, real, visible: true }
})
// Walk over the list to set top offsets
@ -79,11 +83,12 @@ export function useVirtualScrolling({
const bottomScrollBoundary = ref(0)
const updateBoundaries = () => {
if (!toValue(enabled)) return
if (!body.value) return // Not mounted yet
const { top } = body.value.getBoundingClientRect()
const distanceItemTopToWindowTop = 0 - top
const distanceItemTopToWindowTop = 0 - top + offset.value
const distanceItemTopToWindowBottom = windowHeight.value - top
// Technically, bottom scroll boundary should be distance
@ -115,6 +120,14 @@ export function useVirtualScrolling({
updateBoundaries()
}
watch(enabled, (val) => {
if (val) {
resumeWatchers()
} else {
pauseWatchers()
}
})
// # Visiblity
// Add buffer zone to boundary, equal to approx 3 items heights
const bufferZone = computed(
@ -145,64 +158,10 @@ export function useVirtualScrolling({
visible: checkVisible(heightChartItem),
})),
)
// ## Scroll compensation
watch(
heightChart,
async (newVal, oldVal) => {
if (!toValue(scrollCompensation)) return
if (newVal.length === 0 && oldVal.length === 0) return
const diff = (() => {
const expansion = oldVal.length === 0 && newVal.length !== 0
const collapse = oldVal.length !== 0 && newVal.length === 0
if (expansion) {
if (toValue(collapseMode) === 'height') {
const newBottomElement = last(newVal)
return newBottomElement.top + newBottomElement.height
} else if (toValue(collapseMode) === 'item') {
const element = newVal.find(({ id }) => toValue(anchorIds).has(id))
return element.top
} else {
return 0
}
} else if (collapse) {
const oldBottomElement = last(oldVal)
return 0 - oldBottomElement.top - oldBottomElement.height
} else {
const oldVisible = oldVal.filter((item) => checkVisible(item))
const oldItem = first(oldVisible)
if (!oldItem) return 0 // probably out of bounds in timeline
const oldItemUpdated = newVal.find(({ id }) => id === oldItem.id)
if (!oldItemUpdated) return 0 // context change?
return (
oldItemUpdated.top -
oldItem.top -
(oldItem.height - oldItemUpdated.height)
)
}
})()
if (diff !== 0) {
// Scroll by amount offset changed to keep it in view
topScrollBoundary.value += diff
bottomScrollBoundary.value += diff
await scrollBy(0, diff)
await nextTick()
}
resumeWatchers()
},
{ flush: 'post' },
)
const heightChartGrouped = computed(() =>
const heightChartGrouped = computed(() => {
const chart = enabled.value ? heightChartVisibility : heightChart
// Group invisible items into spacers
heightChartVisibility.value.reduce((acc, heightChartItem) => {
return chart.value.reduce((acc, heightChartItem) => {
const { suspendable, visible, height, top, bottom, id } = heightChartItem
// Bottom value isn't really used otherwise for debugging
const present = visible || !suspendable
@ -238,14 +197,112 @@ export function useVirtualScrolling({
return [...acc, spacer]
}
}
}, []),
}, [])
})
// ## Scroll compensation
watch(
heightChart,
async (newVal, oldVal) => {
if (!toValue(scrollCompensation)) return
if (newVal.length === 0 && oldVal.length === 0) return
const expansion = oldVal.length === 0 && newVal.length !== 0
const collapse = oldVal.length !== 0 && newVal.length === 0
const diff = (() => {
if (expansion) {
if (toValue(collapseMode) === 'height') {
const newBottomElement = last(newVal)
return newBottomElement.top + newBottomElement.height
} else if (toValue(collapseMode) === 'item') {
const element = newVal.find(({ id }) => toValue(anchorIds).has(id))
return element.top
} else {
return 0
}
} else if (collapse) {
const oldBottomElement = last(oldVal)
return 0 - oldBottomElement.top - oldBottomElement.height
} else {
const contextChange = (() => {
const oldIds = new Set(oldVal.map(({ id }) => id))
const newIds = new Set(newVal.map(({ id }) => id))
if (oldVal.length <= newVal.length) {
return [...oldIds].some((id) => !newIds.has(id))
} else {
return [...newIds].some((id) => !oldIds.has(id))
}
})()
if (contextChange) return 0
const expansion = (() => {
if (newVal.length < oldVal.length) return 0
const oldVisible = oldVal.filter((item) => checkVisible(item) && item.real)
const oldItem = first(oldVisible)
if (!oldItem) return 0 // probably out of bounds in timeline
const oldItemUpdated = newVal.find(({ id }) => id === oldItem.id)
return (
oldItemUpdated.top -
oldItem.top -
(oldItem.height - oldItemUpdated.height)
)
})()
const collapsing = (() => {
if (newVal.length >= oldVal.length) return 0
const newVisible = newVal
const newItem = first(newVisible)
if (!newItem) return 0 // probably out of bounds in timeline
const newItemBefore = oldVal.find(({ id }) => id === newItem.id)
return (
newItem.top -
newItemBefore.top -
(newItemBefore.height - newItem.height)
)
})()
return expansion + collapsing
}
})()
if (diff !== 0) {
// Scroll by amount offset changed to keep it in view
topScrollBoundary.value += diff
bottomScrollBoundary.value += diff
await scrollBy(0, diff)
await nextTick()
}
resumeWatchers()
},
{ flush: 'post' },
)
// Misc
const reset = async () => {
unsuspendibleIds.value = new Set()
heights.value = new Map()
}
const scrollTo = (anchors) => {
pauseWatchers()
const element = heightChart.value.find(({ id }) => anchors.has(id))
const elementMiddle = element.top + element.height / 2
const desiredTopBoundary = Math.min(element.top, elementMiddle - (windowHeight.value - offset.value) / 2)
console.log(element, desiredTopBoundary, topScrollBoundary.value)
scrollBy(0, desiredTopBoundary - topScrollBoundary.value)
resumeWatchers()
}
return {
heightChart: heightChartGrouped,
changeSuspendState,
@ -254,5 +311,6 @@ export function useVirtualScrolling({
resumeWatchers,
updateBoundaries,
reset,
scrollTo,
}
}