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259 lines
9.7 KiB
259 lines
9.7 KiB
<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> |