259 lines
		
	
	
		
			9.7 KiB
		
	
	
	
		
			Vue
		
	
	
	
			
		
		
	
	
			259 lines
		
	
	
		
			9.7 KiB
		
	
	
	
		
			Vue
		
	
	
	
| <template>
 | ||
|     <view class="u-album">
 | ||
|         <view
 | ||
|             class="u-album__row"
 | ||
|             ref="u-album__row"
 | ||
|             v-for="(arr, index) in showUrls"
 | ||
|             :forComputedUse="albumWidth"
 | ||
|             :key="index"
 | ||
|         >
 | ||
|             <view
 | ||
|                 class="u-album__row__wrapper"
 | ||
|                 v-for="(item, index1) in arr"
 | ||
|                 :key="index1"
 | ||
|                 :style="[imageStyle(index + 1, index1 + 1)]"
 | ||
|                 @tap="previewFullImage ? onPreviewTap(getSrc(item)) : ''"
 | ||
|             >
 | ||
|                 <image
 | ||
|                     :src="getSrc(item)"
 | ||
|                     :mode="
 | ||
|                         urls.length === 1
 | ||
|                             ? imageHeight > 0
 | ||
|                                 ? singleMode
 | ||
|                                 : 'widthFix'
 | ||
|                             : multipleMode
 | ||
|                     "
 | ||
|                     :style="[
 | ||
|                         {
 | ||
|                             width: imageWidth,
 | ||
|                             height: imageHeight
 | ||
|                         }
 | ||
|                     ]"
 | ||
|                 ></image>
 | ||
|                 <view
 | ||
|                     v-if="
 | ||
|                         showMore &&
 | ||
|                         urls.length > rowCount * showUrls.length &&
 | ||
|                         index === showUrls.length - 1 &&
 | ||
|                         index1 === showUrls[showUrls.length - 1].length - 1
 | ||
|                     "
 | ||
|                     class="u-album__row__wrapper__text"
 | ||
|                 >
 | ||
|                     <u--text
 | ||
|                         :text="`+${urls.length - maxCount}`"
 | ||
|                         color="#fff"
 | ||
|                         :size="multipleSize * 0.3"
 | ||
|                         align="center"
 | ||
|                         customStyle="justify-content: center"
 | ||
|                     ></u--text>
 | ||
|                 </view>
 | ||
|             </view>
 | ||
|         </view>
 | ||
|     </view>
 | ||
| </template>
 | ||
| 
 | ||
| <script>
 | ||
| import props from './props.js'
 | ||
| // #ifdef APP-NVUE
 | ||
| // 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
 | ||
| const dom = uni.requireNativePlugin('dom')
 | ||
| // #endif
 | ||
| 
 | ||
| /**
 | ||
|  * Album 相册
 | ||
|  * @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
 | ||
|  * @tutorial https://www.uviewui.com/components/album.html
 | ||
|  *
 | ||
|  * @property {Array}           urls             图片地址列表 Array<String>|Array<Object>形式
 | ||
|  * @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
 | ||
|  * @property {String | Number} singleSize       单图时,图片长边的长度  (默认 180 )
 | ||
|  * @property {String | Number} multipleSize     多图时,图片边长 (默认 70 )
 | ||
|  * @property {String | Number} space            多图时,图片水平和垂直之间的间隔 (默认 6 )
 | ||
|  * @property {String}          singleMode       单图时,图片缩放裁剪的模式 (默认 'scaleToFill' )
 | ||
|  * @property {String}          multipleMode     多图时,图片缩放裁剪的模式 (默认 'aspectFill' )
 | ||
|  * @property {String | Number} maxCount         取消按钮的提示文字 (默认 9 )
 | ||
|  * @property {Boolean}         previewFullImage 是否可以预览图片 (默认 true )
 | ||
|  * @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 )
 | ||
|  * @property {Boolean}         showMore         超出maxCount时是否显示查看更多的提示 (默认 true )
 | ||
|  *
 | ||
|  * @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 )
 | ||
|  * @example <u-album :urls="urls2" @albumWidth="width => albumWidth = width" multipleSize="68" ></u-album>
 | ||
|  */
 | ||
| export default {
 | ||
|     name: 'u-album',
 | ||
|     mixins: [uni.$u.mpMixin, uni.$u.mixin, props],
 | ||
|     data() {
 | ||
|         return {
 | ||
|             // 单图的宽度
 | ||
|             singleWidth: 0,
 | ||
|             // 单图的高度
 | ||
|             singleHeight: 0,
 | ||
|             // 单图时,如果无法获取图片的尺寸信息,让图片宽度默认为容器的一定百分比
 | ||
|             singlePercent: 0.6
 | ||
|         }
 | ||
|     },
 | ||
|     watch: {
 | ||
|         urls: {
 | ||
|             immediate: true,
 | ||
|             handler(newVal) {
 | ||
|                 if (newVal.length === 1) {
 | ||
|                     this.getImageRect()
 | ||
|                 }
 | ||
|             }
 | ||
|         }
 | ||
|     },
 | ||
|     computed: {
 | ||
|         imageStyle() {
 | ||
|             return (index1, index2) => {
 | ||
|                 const { space, rowCount, multipleSize, urls } = this,
 | ||
|                     { addUnit, addStyle } = uni.$u,
 | ||
|                     rowLen = this.showUrls.length,
 | ||
|                     allLen = this.urls.length
 | ||
|                 const style = {
 | ||
|                     marginRight: addUnit(space),
 | ||
|                     marginBottom: addUnit(space)
 | ||
|                 }
 | ||
|                 // 如果为最后一行,则每个图片都无需下边框
 | ||
|                 if (index1 === rowLen) style.marginBottom = 0
 | ||
|                 // 每行的最右边一张和总长度的最后一张无需右边框
 | ||
|                 if (
 | ||
|                     index2 === rowCount ||
 | ||
|                     (index1 === rowLen &&
 | ||
|                         index2 === this.showUrls[index1 - 1].length)
 | ||
|                 )
 | ||
|                     style.marginRight = 0
 | ||
|                 return style
 | ||
|             }
 | ||
|         },
 | ||
|         // 将数组划分为二维数组
 | ||
|         showUrls() {
 | ||
|             const arr = []
 | ||
|             this.urls.map((item, index) => {
 | ||
|                 // 限制最大展示数量
 | ||
|                 if (index + 1 <= this.maxCount) {
 | ||
|                     // 计算该元素为第几个素组内
 | ||
|                     const itemIndex = Math.floor(index / this.rowCount)
 | ||
|                     // 判断对应的索引是否存在
 | ||
|                     if (!arr[itemIndex]) {
 | ||
|                         arr[itemIndex] = []
 | ||
|                     }
 | ||
|                     arr[itemIndex].push(item)
 | ||
|                 }
 | ||
|             })
 | ||
|             return arr
 | ||
|         },
 | ||
|         imageWidth() {
 | ||
|             return uni.$u.addUnit(
 | ||
|                 this.urls.length === 1 ? this.singleWidth : this.multipleSize
 | ||
|             )
 | ||
|         },
 | ||
|         imageHeight() {
 | ||
|             return uni.$u.addUnit(
 | ||
|                 this.urls.length === 1 ? this.singleHeight : this.multipleSize
 | ||
|             )
 | ||
|         },
 | ||
|         // 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
 | ||
|         // 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
 | ||
|         albumWidth() {
 | ||
|             let width = 0
 | ||
|             if (this.urls.length === 1) {
 | ||
|                 width = this.singleWidth
 | ||
|             } else {
 | ||
|                 width =
 | ||
|                     this.showUrls[0].length * this.multipleSize +
 | ||
|                     this.space * (this.showUrls[0].length - 1)
 | ||
|             }
 | ||
|             this.$emit('albumWidth', width)
 | ||
|             return width
 | ||
|         }
 | ||
|     },
 | ||
|     methods: {
 | ||
|         // 预览图片
 | ||
|         onPreviewTap(url) {
 | ||
|             const urls = this.urls.map((item) => {
 | ||
|                 return this.getSrc(item)
 | ||
|             })
 | ||
|             uni.previewImage({
 | ||
|                 current: url,
 | ||
|                 urls
 | ||
|             })
 | ||
|         },
 | ||
|         // 获取图片的路径
 | ||
|         getSrc(item) {
 | ||
|             return uni.$u.test.object(item)
 | ||
|                 ? (this.keyName && item[this.keyName]) || item.src
 | ||
|                 : item
 | ||
|         },
 | ||
|         // 单图时,获取图片的尺寸
 | ||
|         // 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
 | ||
|         // 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)
 | ||
|         getImageRect() {
 | ||
|             const src = this.getSrc(this.urls[0])
 | ||
|             uni.getImageInfo({
 | ||
|                 src,
 | ||
|                 success: (res) => {
 | ||
|                     // 判断图片横向还是竖向展示方式
 | ||
|                     const isHorizotal = res.width >= res.height
 | ||
|                     this.singleWidth = isHorizotal
 | ||
|                         ? this.singleSize
 | ||
|                         : (res.width / res.height) * this.singleSize
 | ||
|                     this.singleHeight = !isHorizotal
 | ||
|                         ? this.singleSize
 | ||
|                         : (res.height / res.width) * this.singleWidth
 | ||
|                 },
 | ||
|                 fail: () => {
 | ||
|                     this.getComponentWidth()
 | ||
|                 }
 | ||
|             })
 | ||
|         },
 | ||
|         // 获取组件的宽度
 | ||
|         async getComponentWidth() {
 | ||
|             // 延时一定时间,以获取dom尺寸
 | ||
|             await uni.$u.sleep(30)
 | ||
|             // #ifndef APP-NVUE
 | ||
|             this.$uGetRect('.u-album__row').then((size) => {
 | ||
|                 this.singleWidth = size.width * this.singlePercent
 | ||
|             })
 | ||
|             // #endif
 | ||
| 
 | ||
|             // #ifdef APP-NVUE
 | ||
|             // 这里ref="u-album__row"所在的标签为通过for循环出来,导致this.$refs['u-album__row']是一个数组
 | ||
|             const ref = this.$refs['u-album__row'][0]
 | ||
|             ref &&
 | ||
|                 dom.getComponentRect(ref, (res) => {
 | ||
|                     this.singleWidth = res.size.width * this.singlePercent
 | ||
|                 })
 | ||
|             // #endif
 | ||
|         }
 | ||
|     }
 | ||
| }
 | ||
| </script>
 | ||
| 
 | ||
| <style lang="scss" scoped>
 | ||
| @import '../../libs/css/components.scss';
 | ||
| 
 | ||
| .u-album {
 | ||
|     @include flex(column);
 | ||
| 
 | ||
|     &__row {
 | ||
|         @include flex(row);
 | ||
|         flex-wrap: wrap;
 | ||
| 
 | ||
|         &__wrapper {
 | ||
|             position: relative;
 | ||
| 
 | ||
|             &__text {
 | ||
|                 position: absolute;
 | ||
|                 top: 0;
 | ||
|                 left: 0;
 | ||
|                 right: 0;
 | ||
|                 bottom: 0;
 | ||
|                 background-color: rgba(0, 0, 0, 0.3);
 | ||
|                 @include flex(row);
 | ||
|                 justify-content: center;
 | ||
|                 align-items: center;
 | ||
|             }
 | ||
|         }
 | ||
|     }
 | ||
| }
 | ||
| </style> |