fix(expertise): refonte logique vidéo forward/reverse sans flash
Problèmes corrigés : - Flash au changement de direction : l'ancien code attendait un événement seeked avant de switcher la visibilité, montrant un mauvais frame. Maintenant on positionne la vidéo cible AVANT de la rendre visible. - Reprise forward depuis mauvaise position : stopActiveVideo() + playForward() synchronisent correctement currentFwdTime avant le switch. - segmentEnds[0] = 0 → currentFwdTime snappé exactement à la cible dans les handlers timeupdate (plus de dérive à 0.1). Changements : - switchToForward/switchToReverse : positionnent la cible puis changent isReverse - playForward/playReverse simplifiés : plus de logique seeked conditionnelle - navigate() simplifié : forward=down, reverse=up, extension de cible si déjà actif - CSS : opacity 0/1 + transition au lieu de display none/block pour éviter les flashes - timeupdate : snap exact à la cible au lieu d'approximation Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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1 changed files with 65 additions and 46 deletions
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@ -8,7 +8,6 @@
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// --- Constants ---
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const PLAY_DELAY_MS = 300 // ms delay before starting playback on slide activation
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const REV_TARGET_MIN = 0.1 // min revTarget to avoid pausing exactly at videoDuration
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// --- State ---
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let currentItem = $state(0)
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@ -37,10 +36,12 @@
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if (isActive) navigation.setScrolled(currentItem > 0)
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})
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// segmentEnds[i] = position forward correspondant à l'item i.
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// Item 0 = début de vidéo (0), item final = fin de vidéo (duration).
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const segmentEnds = $derived(
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itemCount > 0 && videoDuration > 0
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? Array.from({ length: itemCount }, (_, i) =>
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itemCount === 1 ? videoDuration : videoDuration * i / (itemCount - 1))
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itemCount > 1 && videoDuration > 0
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? Array.from({ length: itemCount }, (_, i) => videoDuration * i / (itemCount - 1))
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: itemCount === 1 ? [0]
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: []
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)
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@ -68,6 +69,8 @@
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}
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// --- Video control helpers ---
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/** Stoppe la vidéo active et sauvegarde la position forward-équivalente. */
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function stopActiveVideo() {
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if (videoFwd && !videoFwd.paused) {
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currentFwdTime = videoFwd.currentTime
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@ -81,53 +84,65 @@
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}
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}
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/**
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* Switch visuel entre les deux vidéos.
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* Positionne la vidéo cible au bon frame AVANT de l'afficher
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* pour éliminer les flashes.
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*/
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function switchToForward() {
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if (!isReverse) return
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// Positionner forward au bon frame avant de l'afficher
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if (videoFwd) videoFwd.currentTime = currentFwdTime
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isReverse = false
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}
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function switchToReverse() {
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if (isReverse) return
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// Positionner reverse au bon frame avant de l'afficher
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const revPos = videoDuration - currentFwdTime
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if (videoRev) videoRev.currentTime = revPos
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isReverse = true
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}
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function playForward(targetTime) {
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fwdTarget = targetTime
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if (videoFwd) videoFwd.currentTime = currentFwdTime
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if (isReverse) {
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videoFwd?.addEventListener('seeked', () => {
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isReverse = false
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// Switcher visuellement, puis lancer la lecture
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switchToForward()
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videoFwd?.play().catch(() => {})
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}, { once: true })
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} else {
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videoFwd?.play().catch(() => {})
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}
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}
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function playReverse(targetTime) {
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const revStart = Math.max(0, videoDuration - currentFwdTime)
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revTarget = targetTime
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function playReverse(targetFwdPos) {
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// targetFwdPos = la position forward-équivalente où on veut arriver
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// On la convertit en position dans la vidéo reverse
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revTarget = videoDuration - Math.max(targetFwdPos, 0)
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const revStart = videoDuration - currentFwdTime
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if (videoRev) videoRev.currentTime = revStart
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if (!isReverse) {
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videoRev?.addEventListener('seeked', () => {
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isReverse = true
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// Switcher visuellement, puis lancer la lecture
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switchToReverse()
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videoRev?.play().catch(() => {})
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}, { once: true })
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} else {
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videoRev?.play().catch(() => {})
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}
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}
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// --- Navigate: move one item up or down (called by composable) ---
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function navigate(direction, newItem) {
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const prevItem = currentItem
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currentItem = newItem
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const targetPos = segmentEnds[currentItem]
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if (direction === 'down' && videoFwd && !videoFwd.paused) {
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fwdTarget = segmentEnds[currentItem]
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} else if (direction === 'up' && videoRev && !videoRev.paused) {
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const liveFwdPos = videoDuration - videoRev.currentTime
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const segBoundary = segmentEnds[currentItem]
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const targetFwd = liveFwdPos > segBoundary ? segBoundary : 0
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revTarget = videoDuration - Math.max(targetFwd, REV_TARGET_MIN)
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if (direction === 'down') {
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if (videoFwd && !videoFwd.paused) {
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// Forward déjà en cours : juste mettre à jour la cible
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fwdTarget = targetPos
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} else {
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stopActiveVideo()
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if (direction === 'down') {
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playForward(segmentEnds[currentItem])
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playForward(targetPos)
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}
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} else {
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const segBoundary = segmentEnds[currentItem]
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const targetFwd = currentFwdTime > segBoundary ? segBoundary : 0
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playReverse(videoDuration - Math.max(targetFwd, REV_TARGET_MIN))
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if (videoRev && !videoRev.paused) {
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// Reverse déjà en cours : juste mettre à jour la cible
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revTarget = videoDuration - Math.max(targetPos, 0)
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} else {
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stopActiveVideo()
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playReverse(targetPos)
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}
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}
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@ -137,7 +152,7 @@
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// --- Playback lifecycle ---
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function initPlayback() {
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setTimeout(() => {
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const tryPlay = () => {
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const init = () => {
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const dur = videoFwd?.duration
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if (!dur || itemCount === 0) return
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videoDuration = dur
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@ -148,11 +163,11 @@
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requestAnimationFrame(() => computeOffset())
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}
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if (videoFwd?.duration) {
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tryPlay()
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init()
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} else {
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videoFwd?.addEventListener('loadedmetadata', () => {
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videoDuration = videoFwd.duration
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tryPlay()
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init()
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}, { once: true })
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}
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}, PLAY_DELAY_MS)
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@ -177,7 +192,8 @@
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const onFwdUpdate = () => {
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if (!videoFwd || videoFwd.paused || fwdTarget === null) return
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if (videoFwd.currentTime >= fwdTarget) {
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currentFwdTime = videoFwd.currentTime
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currentFwdTime = fwdTarget // snap exactement à la cible
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videoFwd.currentTime = fwdTarget
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videoFwd.pause()
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fwdTarget = null
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}
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@ -187,7 +203,9 @@
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const onRevUpdate = () => {
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if (!videoRev || videoRev.paused || revTarget === null) return
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if (videoRev.currentTime >= revTarget) {
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currentFwdTime = videoDuration - videoRev.currentTime
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const fwdPos = videoDuration - revTarget
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currentFwdTime = Math.max(fwdPos, 0) // snap exactement
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videoRev.currentTime = revTarget
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videoRev.pause()
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revTarget = null
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}
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@ -303,11 +321,12 @@
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width: 100%;
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height: 100%;
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object-fit: cover;
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display: none;
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opacity: 0;
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transition: opacity 0.15s ease;
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}
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.expertise-bg video.active {
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display: block;
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opacity: 1;
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}
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/* Custom vertical lines */
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