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<template>
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<view class="u-album">
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<view
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class="u-album__row"
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ref="u-album__row"
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v-for="(arr, index) in showUrls"
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:forComputedUse="albumWidth"
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:key="index"
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>
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<view
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class="u-album__row__wrapper"
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v-for="(item, index1) in arr"
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:key="index1"
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:style="[imageStyle(index + 1, index1 + 1)]"
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@tap="previewFullImage ? onPreviewTap(getSrc(item)) : ''"
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>
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<image
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:src="getSrc(item)"
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:mode="
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urls.length === 1
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? imageHeight > 0
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? singleMode
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: 'widthFix'
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: multipleMode
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"
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:style="[
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{
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width: imageWidth,
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height: imageHeight
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}
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]"
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></image>
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<view
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v-if="
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showMore &&
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urls.length > rowCount * showUrls.length &&
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index === showUrls.length - 1 &&
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index1 === showUrls[showUrls.length - 1].length - 1
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"
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class="u-album__row__wrapper__text"
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>
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<u--text
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:text="`+${urls.length - maxCount}`"
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color="#fff"
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:size="multipleSize * 0.3"
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align="center"
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customStyle="justify-content: center"
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></u--text>
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</view>
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</view>
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</view>
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</view>
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</template>
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<script>
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import props from './props.js'
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// #ifdef APP-NVUE
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// 由于weex为阿里的KPI业绩考核的产物，所以不支持百分比单位，这里需要通过dom查询组件的宽度
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const dom = uni.requireNativePlugin('dom')
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// #endif
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/**
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* Album 相册
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* @description 本组件提供一个类似相册的功能，让开发者开发起来更加得心应手。减少重复的模板代码
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* @tutorial https://www.uviewui.com/components/album.html
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*
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* @property {Array} urls 图片地址列表 Array<String>|Array<Object>形式
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* @property {String} keyName 指定从数组的对象元素中读取哪个属性作为图片地址
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* @property {String | Number} singleSize 单图时，图片长边的长度 （默认 180 ）
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* @property {String | Number} multipleSize 多图时，图片边长 （默认 70 ）
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* @property {String | Number} space 多图时，图片水平和垂直之间的间隔 （默认 6 ）
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* @property {String} singleMode 单图时，图片缩放裁剪的模式 （默认 'scaleToFill' ）
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* @property {String} multipleMode 多图时，图片缩放裁剪的模式 （默认 'aspectFill' ）
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* @property {String | Number} maxCount 取消按钮的提示文字 （默认 9 ）
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* @property {Boolean} previewFullImage 是否可以预览图片 （默认 true ）
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* @property {String | Number} rowCount 每行展示图片数量，如设置，singleSize和multipleSize将会无效 （默认 3 ）
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* @property {Boolean} showMore 超出maxCount时是否显示查看更多的提示 （默认 true ）
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*
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* @event {Function} albumWidth 某些特殊的情况下，需要让文字与相册的宽度相等，这里事件的形式对外发送 （回调参数 width ）
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* @example <u-album :urls="urls2" @albumWidth="width => albumWidth = width" multipleSize="68" ></u-album>
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*/
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export default {
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name: 'u-album',
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mixins: [uni.$u.mpMixin, uni.$u.mixin, props],
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data() {
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return {
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// 单图的宽度
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singleWidth: 0,
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// 单图的高度
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singleHeight: 0,
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// 单图时，如果无法获取图片的尺寸信息，让图片宽度默认为容器的一定百分比
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singlePercent: 0.6
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}
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},
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watch: {
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urls: {
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immediate: true,
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handler(newVal) {
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if (newVal.length === 1) {
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this.getImageRect()
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}
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}
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}
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},
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computed: {
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imageStyle() {
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return (index1, index2) => {
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const { space, rowCount, multipleSize, urls } = this,
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{ addUnit, addStyle } = uni.$u,
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rowLen = this.showUrls.length,
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allLen = this.urls.length
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const style = {
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marginRight: addUnit(space),
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marginBottom: addUnit(space)
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}
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// 如果为最后一行，则每个图片都无需下边框
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if (index1 === rowLen) style.marginBottom = 0
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// 每行的最右边一张和总长度的最后一张无需右边框
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if (
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index2 === rowCount ||
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(index1 === rowLen &&
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index2 === this.showUrls[index1 - 1].length)
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)
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style.marginRight = 0
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return style
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}
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},
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// 将数组划分为二维数组
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showUrls() {
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const arr = []
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this.urls.map((item, index) => {
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// 限制最大展示数量
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if (index + 1 <= this.maxCount) {
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// 计算该元素为第几个素组内
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const itemIndex = Math.floor(index / this.rowCount)
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// 判断对应的索引是否存在
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if (!arr[itemIndex]) {
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arr[itemIndex] = []
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}
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arr[itemIndex].push(item)
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}
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})
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return arr
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},
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imageWidth() {
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return uni.$u.addUnit(
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this.urls.length === 1 ? this.singleWidth : this.multipleSize
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)
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},
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imageHeight() {
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return uni.$u.addUnit(
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this.urls.length === 1 ? this.singleHeight : this.multipleSize
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)
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},
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// 此变量无实际用途，仅仅是为了利用computed特性，让其在urls长度等变化时，重新计算图片的宽度
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// 因为用户在某些特殊的情况下，需要让文字与相册的宽度相等，所以这里事件的形式对外发送
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albumWidth() {
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let width = 0
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if (this.urls.length === 1) {
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width = this.singleWidth
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} else {
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width =
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this.showUrls[0].length * this.multipleSize +
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this.space * (this.showUrls[0].length - 1)
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}
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this.$emit('albumWidth', width)
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return width
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}
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},
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methods: {
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// 预览图片
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onPreviewTap(url) {
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const urls = this.urls.map((item) => {
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return this.getSrc(item)
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})
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uni.previewImage({
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current: url,
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urls
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})
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},
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// 获取图片的路径
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getSrc(item) {
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return uni.$u.test.object(item)
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? (this.keyName && item[this.keyName]) || item.src
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: item
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},
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// 单图时，获取图片的尺寸
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// 在小程序中，需要将网络图片的的域名添加到小程序的download域名才可能获取尺寸
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// 在没有添加的情况下，让单图宽度默认为盒子的一定宽度(singlePercent)
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getImageRect() {
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const src = this.getSrc(this.urls[0])
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uni.getImageInfo({
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src,
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success: (res) => {
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// 判断图片横向还是竖向展示方式
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const isHorizotal = res.width >= res.height
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this.singleWidth = isHorizotal
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? this.singleSize
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: (res.width / res.height) * this.singleSize
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this.singleHeight = !isHorizotal
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? this.singleSize
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: (res.height / res.width) * this.singleWidth
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},
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fail: () => {
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this.getComponentWidth()
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}
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})
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},
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// 获取组件的宽度
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async getComponentWidth() {
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// 延时一定时间，以获取dom尺寸
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await uni.$u.sleep(30)
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// #ifndef APP-NVUE
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this.$uGetRect('.u-album__row').then((size) => {
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this.singleWidth = size.width * this.singlePercent
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})
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// #endif
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// #ifdef APP-NVUE
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// 这里ref="u-album__row"所在的标签为通过for循环出来，导致this.$refs['u-album__row']是一个数组
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const ref = this.$refs['u-album__row'][0]
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ref &&
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dom.getComponentRect(ref, (res) => {
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this.singleWidth = res.size.width * this.singlePercent
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})
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// #endif
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}
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}
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}
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</script>
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<style lang="scss" scoped>
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@import '../../libs/css/components.scss';
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.u-album {
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@include flex(column);
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&__row {
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@include flex(row);
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flex-wrap: wrap;
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&__wrapper {
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position: relative;
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&__text {
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position: absolute;
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top: 0;
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left: 0;
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right: 0;
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bottom: 0;
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background-color: rgba(0, 0, 0, 0.3);
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@include flex(row);
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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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}
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}
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</style>
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