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	使用 uview 重构实际登陆
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								yudao-vue-ui/uni_modules/uview-ui/components/u-album/u-album.vue
									
									
									
									
									
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										236
									
								
								yudao-vue-ui/uni_modules/uview-ui/components/u-album/u-album.vue
									
									
									
									
									
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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="onPreviewTap(getSrc(item))"
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			>
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				<image
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				    :src="getSrc(item)"
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				    :mode="urls.length === 1 ? (imageHeight > 0 ? singleMode : 'widthFix') : multipleMode"
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				    :style="[{
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						width: imageWidth,
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						height: imageHeight
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					}]"
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				></image>
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				<view
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				    v-if="showMore && urls.length > rowCount * showUrls.length && index === showUrls.length - 1 && index1 === showUrls[showUrls.length - 1].length - 1"
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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 {
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						space,
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						rowCount,
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						multipleSize,
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						urls
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					} = this, {
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						addUnit,
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						addStyle
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					} = 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 (index2 === rowCount || index1 === rowLen && index2 === this.showUrls[index1 - 1].length) style.marginRight =
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						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 this.$u.addUnit(this.urls.length === 1 ? this.singleWidth : this.multipleSize)
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			},
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			imageHeight() {
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				return this.$u.addUnit(this.urls.length === 1 ? this.singleHeight : this.multipleSize)
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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 = this.showUrls[0].length * this.multipleSize + 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) ? this.keyName && item[this.keyName] || item.src : 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 ? this.singleSize : res.width / res.height * this.singleSize
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						this.singleHeight = !isHorizotal ? this.singleSize : 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 && 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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