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			259 lines
		
	
	
		
			9.7 KiB
		
	
	
	
		
			Vue
		
	
	
	
	
	
			
		
		
	
	
			259 lines
		
	
	
		
			9.7 KiB
		
	
	
	
		
			Vue
		
	
	
	
	
	
<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> |