audiobookshelf/client/components/covers/PreviewCover.vue

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Vue
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<template>
<div class="relative rounded-sm" :style="{ height: width * bookCoverAspectRatio + 'px', width: width + 'px', maxWidth: width + 'px', minWidth: width + 'px' }" @mouseover="isHovering = true" @mouseleave="isHovering = false">
<div class="w-full h-full relative overflow-hidden">
<div v-show="showCoverBg" class="absolute top-0 left-0 w-full h-full overflow-hidden rounded-sm bg-primary">
<div class="absolute cover-bg" ref="coverBg" />
</div>
<img ref="cover" :src="cover" @error="imageError" @load="imageLoaded" class="w-full h-full absolute top-0 left-0" :class="showCoverBg ? 'object-contain' : 'object-fill'" />
<a v-if="!imageFailed && showOpenNewTab && isHovering" :href="cover" @click.stop target="_blank" class="absolute bg-primary flex items-center justify-center shadow-sm rounded-full hover:scale-110 transform duration-100" :style="{ top: sizeMultiplier * 0.5 + 'rem', right: sizeMultiplier * 0.5 + 'rem', width: 2.5 * sizeMultiplier + 'rem', height: 2.5 * sizeMultiplier + 'rem' }">
<span class="material-icons" :style="{ fontSize: sizeMultiplier * 1.75 + 'rem' }">open_in_new</span>
</a>
</div>
<div v-if="imageFailed" class="absolute top-0 left-0 right-0 bottom-0 w-full h-full bg-red-100" :style="{ padding: placeholderCoverPadding + 'rem' }">
<div class="w-full h-full border-2 border-error flex flex-col items-center justify-center">
<img v-if="width > 100" src="/Logo.png" class="mb-2" :style="{ height: 40 * sizeMultiplier + 'px' }" />
<p class="text-center text-error" :style="{ fontSize: invalidCoverFontSize + 'rem' }">Invalid Cover</p>
</div>
</div>
<p v-if="!imageFailed && showResolution" class="absolute -bottom-5 left-0 right-0 mx-auto text-xs text-gray-300 text-center">{{ resolution }}</p>
</div>
</template>
<script>
export default {
props: {
src: String,
width: {
type: Number,
default: 120
},
showOpenNewTab: Boolean,
bookCoverAspectRatio: Number,
showResolution: {
type: Boolean,
default: true
}
},
data() {
return {
imageFailed: false,
showCoverBg: false,
isHovering: false,
naturalHeight: 0,
naturalWidth: 0
}
},
watch: {
cover() {
this.imageFailed = false
}
},
computed: {
cover() {
return this.src
},
sizeMultiplier() {
return this.width / 120
},
invalidCoverFontSize() {
return Math.max(this.sizeMultiplier * 0.8, 0.5)
},
placeholderCoverPadding() {
return 0.8 * this.sizeMultiplier
},
resolution() {
return `${this.naturalWidth}×${this.naturalHeight}px`
},
placeholderUrl() {
const config = this.$config || this.$nuxt.$config
return `${config.routerBasePath}/book_placeholder.jpg`
}
},
methods: {
setCoverBg() {
if (this.$refs.coverBg) {
this.$refs.coverBg.style.backgroundImage = `url("${this.src}")`
}
},
imageLoaded() {
if (this.$refs.cover && this.src !== this.placeholderUrl) {
var { naturalWidth, naturalHeight } = this.$refs.cover
this.naturalHeight = naturalHeight
this.naturalWidth = naturalWidth
var aspectRatio = naturalHeight / naturalWidth
var arDiff = Math.abs(aspectRatio - this.bookCoverAspectRatio)
// If image aspect ratio is <= 1.45 or >= 1.75 then use cover bg, otherwise stretch to fit
if (arDiff > 0.15) {
this.showCoverBg = true
this.$nextTick(this.setCoverBg)
} else {
this.showCoverBg = false
}
}
},
imageError(err) {
console.error('ImgError', err)
this.imageFailed = true
}
},
mounted() {}
}
</script>