feat: media preview modal - better zoom support (#2133)
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Horváth Bálint
GitHub
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commit
a94fe1c9d0
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@ -53,21 +53,19 @@ onUnmounted(() => locked.value = false)
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<div i-ri:arrow-left-s-line text-white />
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</button>
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<div flex flex-row items-center mxa>
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<div flex="~ col center" max-h-full max-w-full>
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<ModalMediaPreviewCarousel v-model="index" :media="mediaPreviewList" @close="emit('close')" />
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<div flex="~ col center" h-full w-full>
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<ModalMediaPreviewCarousel v-model="index" :media="mediaPreviewList" @close="emit('close')" />
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<div bg="black/30" dark:bg="white/10" ms-4 mb-6 mt-4 text-white rounded-full flex="~ center shrink-0" overflow-hidden>
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<div v-if="mediaPreviewList.length > 1" p="y-1 x-3" rounded-r-0 shrink-0>
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{{ index + 1 }} / {{ mediaPreviewList.length }}
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</div>
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<p
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v-if="current.description" bg="dark/30" dark:bg="white/10" p="y-1 x-3" rounded-ie-full line-clamp-1
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ws-pre-wrap break-all :title="current.description" w-full
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>
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{{ current.description }}
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</p>
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<div bg="black/30" dark:bg="white/10" mb-6 mt-4 text-white rounded-full flex="~ center shrink-0" overflow-hidden>
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<div v-if="mediaPreviewList.length > 1" p="y-1 x-3" rounded-r-0 shrink-0>
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{{ index + 1 }} / {{ mediaPreviewList.length }}
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</div>
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<p
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v-if="current.description" bg="dark/30" dark:bg="white/10" p="y-1 x-3" rounded-ie-full line-clamp-1
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ws-pre-wrap break-all :title="current.description" w-full
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>
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{{ current.description }}
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</p>
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</div>
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</div>
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@ -1,12 +1,11 @@
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<script setup lang="ts">
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import type { Vector2 } from '@vueuse/gesture'
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import { useGesture } from '@vueuse/gesture'
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import type { PermissiveMotionProperties } from '@vueuse/motion'
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import { useReducedMotion } from '@vueuse/motion'
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import type { mastodon } from 'masto'
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const { media = [], threshold = 20 } = defineProps<{
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const { media = [] } = defineProps<{
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media?: mastodon.v1.MediaAttachment[]
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threshold?: number
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}>()
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const emit = defineEmits<{
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@ -17,88 +16,266 @@ const { modelValue } = defineModels<{
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modelValue: number
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}>()
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const target = ref()
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const slideGap = 20
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const doubleTapTreshold = 250
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const view = ref()
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const slider = ref()
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const slide = ref()
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const image = ref()
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const animateTimeout = useTimeout(10)
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const reduceMotion = process.server ? ref(false) : useReducedMotion()
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const isInitialScrollDone = useTimeout(350)
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const canAnimate = computed(() => isInitialScrollDone.value && !reduceMotion.value)
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const canAnimate = computed(() => !reduceMotion.value && animateTimeout.value)
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const scale = ref(1)
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const x = ref(0)
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const y = ref(0)
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const { motionProperties } = useMotionProperties(target, {
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cursor: 'grab',
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scale: 1,
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x: 0,
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y: 0,
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})
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const { set } = useSpring(motionProperties as Partial<PermissiveMotionProperties>)
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const isDragging = ref(false)
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const isPinching = ref(false)
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function resetZoom() {
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set({ scale: 1 })
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const maxZoomOut = ref(1)
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const isZoomedIn = computed(() => scale.value > 1)
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function goToFocusedSlide() {
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scale.value = 1
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x.value = slide.value[modelValue.value].offsetLeft * scale.value
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y.value = 0
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}
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watch(modelValue, resetZoom)
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onMounted(() => {
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const slideGapAsScale = slideGap / view.value.clientWidth
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maxZoomOut.value = 1 - slideGapAsScale
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const { width, height } = useElementSize(target)
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const { isSwiping, lengthX, lengthY, direction } = useSwipe(target, {
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threshold: 5,
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passive: false,
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onSwipeEnd(e, direction) {
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// eslint-disable-next-line @typescript-eslint/no-use-before-define
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if (direction === 'right' && Math.abs(distanceX.value) > threshold) {
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modelValue.value = Math.max(0, modelValue.value - 1)
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resetZoom()
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}
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// eslint-disable-next-line @typescript-eslint/no-use-before-define
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if (direction === 'left' && Math.abs(distanceX.value) > threshold) {
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modelValue.value = Math.min(media.length - 1, modelValue.value + 1)
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resetZoom()
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}
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// eslint-disable-next-line @typescript-eslint/no-use-before-define
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if (direction === 'up' && Math.abs(distanceY.value) > threshold)
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emit('close')
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},
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goToFocusedSlide()
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})
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watch(modelValue, goToFocusedSlide)
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let lastOrigin = [0, 0]
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let initialScale = 0
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useGesture({
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onPinch({ offset: [distance, _angle] }) {
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set({ scale: Math.max(0.5, 1 + distance / 200) })
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onPinch({ first, initial: [initialDistance], movement: [deltaDistance], da: [distance], origin, touches }) {
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isPinching.value = true
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if (first) {
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initialScale = scale.value
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}
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else {
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if (touches === 0)
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handleMouseWheelZoom(initialScale, deltaDistance, origin)
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else
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handlePinchZoom(initialScale, initialDistance, distance, origin)
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}
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lastOrigin = origin
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},
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onMove({ movement: [x, y], dragging, pinching }) {
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if (dragging && !pinching)
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set({ x, y })
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onPinchEnd() {
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isPinching.value = false
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isDragging.value = false
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if (!isZoomedIn.value)
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goToFocusedSlide()
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},
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onDrag({ movement, delta, pinching, tap, last, swipe, event, xy }) {
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event.preventDefault()
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if (pinching)
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return
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if (last)
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handleLastDrag(tap, swipe, movement, xy)
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else
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handleDrag(delta, movement)
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},
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}, {
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domTarget: target,
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domTarget: view,
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eventOptions: {
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passive: true,
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passive: false,
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},
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})
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const distanceX = computed(() => {
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if (width.value === 0)
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return 0
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const shiftRestrictions = computed(() => {
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const focusedImage = image.value[modelValue.value]
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const focusedSlide = slide.value[modelValue.value]
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if (!isSwiping.value || (direction.value !== 'left' && direction.value !== 'right'))
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return modelValue.value * 100 * -1
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const scaledImageWidth = focusedImage.offsetWidth * scale.value
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const scaledHorizontalOverflow = scaledImageWidth / 2 - view.value.clientWidth / 2 + slideGap
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const horizontalOverflow = Math.max(0, scaledHorizontalOverflow / scale.value)
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return (lengthX.value / width.value) * 100 * -1 + (modelValue.value * 100) * -1
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const scaledImageHeight = focusedImage.offsetHeight * scale.value
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const scaledVerticalOverflow = scaledImageHeight / 2 - view.value.clientHeight / 2 + slideGap
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const verticalOverflow = Math.max(0, scaledVerticalOverflow / scale.value)
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return {
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left: focusedSlide.offsetLeft - horizontalOverflow,
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right: focusedSlide.offsetLeft + horizontalOverflow,
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top: focusedSlide.offsetTop - verticalOverflow,
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bottom: focusedSlide.offsetTop + verticalOverflow,
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}
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})
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const distanceY = computed(() => {
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if (height.value === 0 || !isSwiping.value || direction.value !== 'up')
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return 0
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function handlePinchZoom(initialScale: number, initialDistance: number, distance: number, [originX, originY]: Vector2) {
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scale.value = initialScale * (distance / initialDistance)
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scale.value = Math.max(maxZoomOut.value, scale.value)
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return (lengthY.value / height.value) * 100 * -1
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const deltaCenterX = originX - lastOrigin[0]
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const deltaCenterY = originY - lastOrigin[1]
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handleZoomDrag([deltaCenterX, deltaCenterY])
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}
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function handleMouseWheelZoom(initialScale: number, deltaDistance: number, [originX, originY]: Vector2) {
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scale.value = initialScale + (deltaDistance / 1000)
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scale.value = Math.max(maxZoomOut.value, scale.value)
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const deltaCenterX = lastOrigin[0] - originX
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const deltaCenterY = lastOrigin[1] - originY
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handleZoomDrag([deltaCenterX, deltaCenterY])
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}
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function handleLastDrag(tap: boolean, swipe: Vector2, movement: Vector2, position: Vector2) {
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isDragging.value = false
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if (tap)
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handleTap(position)
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else if (swipe[0] || swipe[1])
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handleSwipe(swipe, movement)
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else if (!isZoomedIn.value)
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slideToClosestSlide()
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}
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let lastTapAt = 0
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function handleTap([positionX, positionY]: Vector2) {
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const now = Date.now()
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const isDoubleTap = now - lastTapAt < doubleTapTreshold
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lastTapAt = now
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if (!isDoubleTap)
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return
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if (isZoomedIn.value) {
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goToFocusedSlide()
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}
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else {
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const focusedSlideBounding = slide.value[modelValue.value].getBoundingClientRect()
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const slideCenterX = focusedSlideBounding.left + focusedSlideBounding.width / 2
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const slideCenterY = focusedSlideBounding.top + focusedSlideBounding.height / 2
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scale.value = 3
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x.value += positionX - slideCenterX
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y.value += positionY - slideCenterY
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restrictShiftToInsideSlide()
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}
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}
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function handleSwipe([horiz, vert]: Vector2, [movementX, movementY]: Vector2) {
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if (isZoomedIn.value || isPinching.value)
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return
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const isHorizontalDrag = Math.abs(movementX) >= Math.abs(movementY)
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if (isHorizontalDrag) {
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if (horiz === 1) // left
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modelValue.value = Math.max(0, modelValue.value - 1)
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if (horiz === -1) // right
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modelValue.value = Math.min(media.length - 1, modelValue.value + 1)
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}
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else if (vert === 1 || vert === -1) {
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emit('close')
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}
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goToFocusedSlide()
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}
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function slideToClosestSlide() {
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const startOfFocusedSlide = slide.value[modelValue.value].offsetLeft * scale.value
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const slideWidth = slide.value[modelValue.value].offsetWidth * scale.value
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if (x.value > startOfFocusedSlide + slideWidth / 2)
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modelValue.value = Math.min(media.length - 1, modelValue.value + 1)
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else if (x.value < startOfFocusedSlide - slideWidth / 2)
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modelValue.value = Math.max(0, modelValue.value - 1)
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goToFocusedSlide()
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}
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function handleDrag(delta: Vector2, movement: Vector2) {
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isDragging.value = true
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if (isZoomedIn.value)
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handleZoomDrag(delta)
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else
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handleSlideDrag(movement)
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}
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function handleZoomDrag([deltaX, deltaY]: Vector2) {
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x.value -= deltaX / scale.value
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y.value -= deltaY / scale.value
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restrictShiftToInsideSlide()
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}
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function handleSlideDrag([movementX, movementY]: Vector2) {
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goToFocusedSlide()
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if (Math.abs(movementY) > Math.abs(movementX)) // vertical movement is more then horizontal
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y.value -= movementY / scale.value
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else
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x.value -= movementX / scale.value
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if (media.length === 1)
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x.value = 0
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}
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function restrictShiftToInsideSlide() {
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x.value = Math.min(shiftRestrictions.value.right, Math.max(shiftRestrictions.value.left, x.value))
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y.value = Math.min(shiftRestrictions.value.bottom, Math.max(shiftRestrictions.value.top, y.value))
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}
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const sliderStyle = computed(() => {
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const style = {
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transform: `scale(${scale.value}) translate(${-x.value}px, ${-y.value}px)`,
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transition: 'none',
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gap: `${slideGap}px`,
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}
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if (canAnimate.value && !isDragging.value && !isPinching.value)
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style.transition = 'all 0.3s ease'
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return style
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})
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const imageStyle = computed(() => ({
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cursor: isDragging.value ? 'grabbing' : 'grab',
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}))
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</script>
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<template>
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<div ref="target" flex flex-row max-h-full max-w-full overflow-hidden>
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<div flex :style="{ transform: `translateX(${distanceX}%) translateY(${distanceY}%)`, transition: isSwiping ? 'none' : canAnimate ? 'all 0.5s ease' : 'none' }">
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<div v-for="item in media" :key="item.id" p4 select-none w-full flex-shrink-0 flex flex-col items-center justify-center>
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<img max-h-full max-w-full :draggable="false" select-none :src="item.url || item.previewUrl" :alt="item.description || ''">
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<div ref="view" flex flex-row h-full w-full overflow-hidden>
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<div ref="slider" :style="sliderStyle" w-full h-full flex items-center>
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<div
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v-for="item in media"
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:key="item.id"
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ref="slide"
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flex-shrink-0
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w-full
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h-full
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flex
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items-center
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justify-center
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>
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<img
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ref="image"
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select-none
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max-w-full
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max-h-full
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:style="imageStyle"
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:draggable="false"
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:src="item.url || item.previewUrl"
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:alt="item.description || ''"
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>
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</div>
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</div>
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</div>
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