audiobookshelf/client/components/cards/GroupCover.vue

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Vue
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<template>
<div ref="wrapper" :style="{ height: height + 'px', width: width + 'px' }" class="relative">
<div v-if="noValidCovers" class="absolute top-0 left-0 w-full h-full flex items-center justify-center box-shadow-book">
<p :style="{ fontSize: sizeMultiplier + 'rem' }">{{ name }}</p>
</div>
</div>
</template>
<script>
export default {
props: {
name: String,
bookItems: {
type: Array,
default: () => []
},
width: Number,
height: Number
},
data() {
return {
noValidCovers: false,
coverDiv: null
}
},
watch: {
bookItems: {
immediate: true,
handler(newVal) {
if (newVal) {
// ensure wrapper is initialized
this.$nextTick(this.init)
}
}
}
},
computed: {
sizeMultiplier() {
return this.width / 192
}
},
methods: {
getCoverUrl(book) {
return this.$store.getters['audiobooks/getBookCoverSrc'](book, '')
},
async buildCoverImg(src, bgCoverWidth, offsetLeft, forceCoverBg = false) {
var showCoverBg =
forceCoverBg ||
(await new Promise((resolve) => {
var image = new Image()
image.onload = () => {
var { naturalWidth, naturalHeight } = image
var aspectRatio = naturalHeight / naturalWidth
var arDiff = Math.abs(aspectRatio - 1.6)
// If image aspect ratio is <= 1.45 or >= 1.75 then use cover bg, otherwise stretch to fit
if (arDiff > 0.15) {
resolve(true)
} else {
resolve(false)
}
}
image.onerror = (err) => {
console.error(err)
resolve(false)
}
image.src = src
}))
var imgdiv = document.createElement('div')
imgdiv.style.height = this.height + 'px'
imgdiv.style.width = bgCoverWidth + 'px'
imgdiv.style.left = offsetLeft + 'px'
imgdiv.className = 'absolute top-0 box-shadow-book'
imgdiv.style.boxShadow = '-4px 0px 4px #11111166'
// imgdiv.style.transform = 'skew(0deg, 15deg)'
if (showCoverBg) {
var coverbgwrapper = document.createElement('div')
coverbgwrapper.className = 'absolute top-0 left-0 w-full h-full bg-primary'
var coverbg = document.createElement('div')
coverbg.className = 'w-full h-full'
coverbg.style.backgroundImage = `url("${src}")`
coverbg.style.backgroundSize = 'cover'
coverbg.style.backgroundPosition = 'center'
coverbg.style.opacity = 0.25
coverbg.style.filter = 'blur(1px)'
coverbgwrapper.appendChild(coverbg)
imgdiv.appendChild(coverbgwrapper)
}
var img = document.createElement('img')
img.src = src
img.className = 'absolute top-0 left-0 w-full h-full'
img.style.objectFit = showCoverBg ? 'contain' : 'cover'
imgdiv.appendChild(img)
return imgdiv
},
async init() {
if (this.coverDiv) {
this.coverDiv.remove()
this.coverDiv = null
}
var validCovers = this.bookItems.map((bookItem) => this.getCoverUrl(bookItem.book)).filter((b) => b !== '')
if (!validCovers.length) {
this.noValidCovers = true
return
}
this.noValidCovers = false
var coverWidth = this.width
var widthPer = this.width
if (validCovers.length > 1) {
coverWidth = this.height / 1.6
widthPer = (this.width - coverWidth) / (validCovers.length - 1)
}
var outerdiv = document.createElement('div')
outerdiv.className = 'w-full h-full relative'
for (let i = 0; i < validCovers.length; i++) {
var offsetLeft = widthPer * i
var img = await this.buildCoverImg(validCovers[i], coverWidth, offsetLeft, validCovers.length === 1)
outerdiv.appendChild(img)
}
if (this.$refs.wrapper) {
this.coverDiv = outerdiv
this.$refs.wrapper.appendChild(outerdiv)
}
}
},
mounted() {}
}
</script>