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+<template>
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+ <transition name="viewer-fade">
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+ <div
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+ v-show="show"
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+ ref="wrapElRef"
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+ tabindex="-1"
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+ :style="{ 'z-index': zIndex }"
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+ class="image-viewer__wrapper"
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+ >
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+ <div class="image-viewer__mask"></div>
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+ <!-- CLOSE -->
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+ <span class="image-viewer__btn image-viewer__close" @click="hide">
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+ <i class="el-icon-circle-close iconfont"></i>
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+ </span>
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+ <!-- ARROW -->
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+ <template v-if="!isSingle">
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+ <span
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+ class="image-viewer__btn image-viewer__prev"
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+ :class="{ 'is-disabled': !infinite && isFirst }"
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+ @click="prev"
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+ >
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+ <i class="el-icon-arrow-left iconfont"></i>
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+ </span>
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+ <span
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+ class="image-viewer__btn image-viewer__next"
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+ :class="{ 'is-disabled': !infinite && isLast }"
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+ @click="next"
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+ >
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+ <i class="el-icon-arrow-right iconfont"></i>
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+ </span>
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+ </template>
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+ <!-- ACTIONS -->
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+ <div class="image-viewer__btn image-viewer__actions">
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+ <div class="image-viewer__actions__inner">
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+ <svg-icon class="iconfont" icon-class="unscale" @click="handleActions('zoomOut')" />
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+ <svg-icon class="iconfont" icon-class="scale" @click="handleActions('zoomIn')" />
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+ <svg-icon class="iconfont" icon-class="resume" @click="toggleMode" />
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+ <svg-icon
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+ class="iconfont"
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+ icon-class="unrotate"
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+ @click="handleActions('anticlocelise')"
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+ />
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+ <svg-icon class="iconfont" icon-class="rotate" @click="handleActions('clocelise')" />
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+ </div>
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+ </div>
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+ <!-- CANVAS -->
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+ <div class="image-viewer__canvas">
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+ <img
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+ ref="imgRef"
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+ :src="currentImg"
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+ :style="imgStyle"
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+ class="image-viewer__img"
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+ @load="handleImgLoad"
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+ @error="handleImgError"
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+ @mousedown="handleMouseDown"
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+ @click="select"
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+ />
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+ </div>
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+ </div>
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+ </transition>
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+</template>
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+
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+<script setup lang="ts" name="Preview">
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+import { ref, reactive, computed, watch, nextTick, unref } from 'vue'
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+import { previewProps } from './props'
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+import { isFirefox } from '@/utils/validate'
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+import { on, off } from '@/utils/dom-utils'
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+import throttle from 'lodash-es/throttle'
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+import SvgIcon from '_c/SvgIcon/index.vue'
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+const mousewheelEventName = isFirefox() ? 'DOMMouseScroll' : 'mousewheel'
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+
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+const props = defineProps(previewProps)
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+
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+const infinite = ref<boolean>(true)
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+const loading = ref<boolean>(false)
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+const show = ref<boolean>(props.show)
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+const index = ref<number>(props.index)
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+const transform = reactive({
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+ scale: 1,
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+ deg: 0,
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+ offsetX: 0,
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+ offsetY: 0,
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+ enableTransition: false
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+})
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+const isSingle = computed((): boolean => props.imageList.length <= 1)
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+const isFirst = computed((): boolean => index.value === 0)
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+const isLast = computed((): boolean => index.value === props.imageList.length - 1)
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+const currentImg = computed((): string => props.imageList[index.value])
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+const imgStyle = computed(() => {
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+ const { scale, deg, offsetX, offsetY, enableTransition } = transform
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+ const style = {
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+ transform: `scale(${scale}) rotate(${deg}deg)`,
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+ transition: enableTransition ? 'transform .3s' : '',
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+ 'margin-left': `${offsetX}px`,
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+ 'margin-top': `${offsetY}px`
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+ }
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+ return style
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+})
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+
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+const wrapElRef = ref<HTMLElement | null>(null)
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+const imgRef = ref<HTMLElement | null>(null)
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+
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+let _keyDownHandler: Function | null = null
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+let _mouseWheelHandler: Function | null = null
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+let _dragHandler: Function | null = null
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+
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+watch(
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+ () => index.value,
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+ () => {
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+ reset()
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+ }
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+)
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+
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+watch(
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+ () => currentImg.value,
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+ () => {
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+ nextTick(() => {
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+ const $img = unref(imgRef) as any
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+ if (!$img.complete) {
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+ loading.value = true
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+ }
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+ })
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+ }
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+)
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+
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+watch(
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+ () => show.value,
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+ (show: boolean) => {
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+ if (show) {
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+ nextTick(() => {
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+ ;(unref(wrapElRef) as any).focus()
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+ document.body.style.overflow = 'hidden'
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+ deviceSupportInstall()
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+ })
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+ } else {
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+ nextTick(() => {
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+ document.body.style.overflow = 'auto'
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+ deviceSupportUninstall()
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+ })
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+ }
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+ },
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+ {
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+ immediate: true
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+ }
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+)
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+
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+function hide(): void {
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+ show.value = false
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+ if (typeof props.onClose === 'function') {
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+ props.onClose(index.value)
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+ }
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+}
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+
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+function select(): void {
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+ if (typeof props.onSelect === 'function') {
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+ props.onSelect(index.value)
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+ }
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+}
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+
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+function deviceSupportInstall(): void {
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+ _keyDownHandler = throttle((e: any) => {
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+ const keyCode = e.keyCode
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+ switch (keyCode) {
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+ // ESC
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+ case 27:
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+ hide()
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+ break
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+ // SPACE
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+ case 32:
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+ toggleMode()
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+ break
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+ // LEFT_ARROW
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+ case 37:
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+ prev()
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+ break
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+ // UP_ARROW
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+ case 38:
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+ handleActions('zoomIn')
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+ break
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+ // RIGHT_ARROW
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+ case 39:
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+ next()
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+ break
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+ // DOWN_ARROW
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+ case 40:
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+ handleActions('zoomOut')
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+ break
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+ }
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+ })
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+
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+ _mouseWheelHandler = throttle((e: any) => {
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+ const delta = e.wheelDelta ? e.wheelDelta : -e.detail
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+ if (delta > 0) {
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+ handleActions('zoomIn', {
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+ zoomRate: 0.015,
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+ enableTransition: false
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+ })
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+ } else {
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+ handleActions('zoomOut', {
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+ zoomRate: 0.015,
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+ enableTransition: false
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+ })
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+ }
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+ })
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+ on(document, 'keydown', _keyDownHandler as any)
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+ on(document, mousewheelEventName, _mouseWheelHandler as any)
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+}
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+
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+function deviceSupportUninstall(): void {
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+ off(document, 'keydown', _keyDownHandler)
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+ off(document, mousewheelEventName, _mouseWheelHandler)
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+ _keyDownHandler = null
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+ _mouseWheelHandler = null
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+}
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+
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+function handleImgLoad(): void {
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+ loading.value = false
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+}
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+
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+function handleImgError(e: any): void {
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+ loading.value = false
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+ e.target.alt = '加载失败'
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+}
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+
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+function handleMouseDown(e: any): void {
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+ if (loading.value || e.button !== 0) return
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+ const { offsetX, offsetY } = transform
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+ const startX = e.pageX
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+ const startY = e.pageY
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+ _dragHandler = throttle((ev: any) => {
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+ transform.offsetX = offsetX + ev.pageX - startX
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+ transform.offsetY = offsetY + ev.pageY - startY
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+ })
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+ on(document, 'mousemove', _dragHandler as any)
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+ on(document, 'mouseup', () => {
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+ off(document, 'mousemove', _dragHandler as any)
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+ })
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+
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+ e.preventDefault()
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+}
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+
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+function reset(): void {
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+ transform.scale = 1
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+ transform.deg = 0
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+ transform.offsetX = 0
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+ transform.offsetY = 0
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+ transform.enableTransition = false
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+}
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+
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+function toggleMode(): void {
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+ if (loading.value) return
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+ reset()
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+}
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+
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+function prev(): void {
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+ if (isFirst.value && !infinite.value) return
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+ const len = props.imageList.length
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+ index.value = (index.value - 1 + len) % len
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+}
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+
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+function next(): void {
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+ if (isLast.value && !infinite.value) return
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+ const len = props.imageList.length
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+ index.value = (index.value + 1) % len
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+}
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+
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+function handleActions(action: string, options: any = {}): void {
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+ if (loading.value) return
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+ const style = {
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+ zoomRate: 0.2,
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+ rotateDeg: 90,
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+ enableTransition: true,
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+ ...options
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+ }
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+ const { zoomRate, rotateDeg, enableTransition } = style
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+ switch (action) {
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+ case 'zoomOut':
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+ if (transform.scale > 0.2) {
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+ transform.scale = parseFloat((transform.scale - zoomRate).toFixed(3))
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+ }
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+ break
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+ case 'zoomIn':
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+ transform.scale = parseFloat((transform.scale + zoomRate).toFixed(3))
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+ break
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+ case 'clocelise':
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+ transform.deg += rotateDeg
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+ break
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+ case 'anticlocelise':
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+ transform.deg -= rotateDeg
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+ break
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+ }
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+ transform.enableTransition = enableTransition
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+}
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+</script>
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+
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+<style lang="less" scoped>
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+.iconfont {
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+ cursor: pointer;
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+}
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+
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+.image-viewer__wrapper {
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+ position: fixed;
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+ top: 0;
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+ right: 0;
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+ bottom: 0;
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+ left: 0;
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+}
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+
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+.image-viewer__btn {
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+ position: absolute;
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+ z-index: 1;
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+ display: flex;
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+ cursor: pointer;
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+ border-radius: 50%;
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+ opacity: 0.8;
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+ box-sizing: border-box;
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+ user-select: none;
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+ align-items: center;
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+ justify-content: center;
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+}
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+
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+.image-viewer__close {
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+ top: 40px;
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+ right: 40px;
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+ width: 40px;
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+ height: 40px;
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+ font-size: 40px;
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+ color: #fff;
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+}
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+
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+.image-viewer__canvas {
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+ display: flex;
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+ width: 100%;
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+ height: 100%;
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+ justify-content: center;
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+ align-items: center;
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+}
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+
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+.image-viewer__actions {
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+ bottom: 30px;
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+ left: 50%;
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+ width: 282px;
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+ height: 44px;
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+ padding: 0 23px;
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+ background-color: #606266;
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+ border-color: #fff;
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+ border-radius: 22px;
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+ transform: translateX(-50%);
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+
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+ .image-viewer__actions__inner {
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+ display: flex;
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+ width: 100%;
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+ height: 100%;
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+ font-size: 23px;
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+ color: #fff;
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+ text-align: justify;
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+ cursor: default;
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+ align-items: center;
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+ justify-content: space-around;
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+ }
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+}
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+
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+.image-viewer__prev {
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+ top: 50%;
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+ left: 40px;
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+ width: 44px;
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+ height: 44px;
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+ font-size: 24px;
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+ color: #fff;
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+ background-color: #606266;
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+ border-color: #fff;
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+ transform: translateY(-50%);
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+}
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+
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+.image-viewer__next {
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+ top: 50%;
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+ right: 40px;
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+ width: 44px;
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+ height: 44px;
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+ font-size: 24px;
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+ color: #fff;
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+ text-indent: 2px;
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+ background-color: #606266;
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+ border-color: #fff;
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+ transform: translateY(-50%);
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+}
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+
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+.image-viewer__mask {
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+ position: absolute;
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+ top: 0;
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+ left: 0;
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+ width: 100%;
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+ height: 100%;
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+ background: #000;
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+ opacity: 0.5;
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+}
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+
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+.viewer-fade-enter-active {
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+ animation: viewer-fade-in 0.3s;
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+}
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+
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+.viewer-fade-leave-active {
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+ animation: viewer-fade-out 0.3s;
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+}
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+
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+@keyframes viewer-fade-in {
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+ 0% {
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+ opacity: 0;
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+ transform: translate3d(0, -20px, 0);
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+ }
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+
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+ 100% {
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+ opacity: 1;
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+ transform: translate3d(0, 0, 0);
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+ }
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+}
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+
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+@keyframes viewer-fade-out {
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+ 0% {
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+ opacity: 1;
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+ transform: translate3d(0, 0, 0);
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+ }
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+
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+ 100% {
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+ opacity: 0;
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+ transform: translate3d(0, -20px, 0);
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+ }
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+}
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+</style>
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