公司小程序
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<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="onPreviewTap(getSrc(item))"
>
<image
:src="getSrc(item)"
:mode="urls.length === 1 ? (imageHeight > 0 ? singleMode : 'widthFix') : multipleMode"
:style="[{
width: $u.addUnit(imageWidth),
height: $u.addUnit(imageHeight)
}]"
></image>
<view
v-if="showMore && urls.length > rowCount * showUrls.length && index === showUrls.length - 1 && index1 === showUrls[showUrls.length - 1].length - 1"
class="u-album__row__wrapper__text"
>
<u--text
:text="`+${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.$u,
rowLen = this.showUrls.length,
allLen = this.urls.length
const style = {
marginRight: addUnit(space),
marginBottom: addUnit(space)
}
// 如果为最后一行,则每个图片都无需下边框
if (index1 === rowLen) style.marginBottom = 0
// 每行的最右边一张和总长度的最后一张无需右边框
if (index2 === rowCount || index1 === rowLen && index2 === this.showUrls[index1 - 1].length) style.marginRight =
0
return style
}
},
// 将数组划分为二维数组
showUrls() {
const arr = []
this.urls.map((item, index) => {
// 限制最大展示数量
if(index + 1 <= this.maxCount) {
// 计算该元素为第几个素组内
const itemIndex = Math.floor(index / this.rowCount)
// 判断对应的索引是否存在
if (!arr[itemIndex]) {
arr[itemIndex] = []
}
arr[itemIndex].push(item)
}
})
return arr
},
imageWidth() {
return this.urls.length === 1 ? this.singleWidth : this.multipleSize
},
imageHeight() {
return this.urls.length === 1 ? this.singleHeight : this.multipleSize
},
// 此变量无实际用途,仅仅是为了利用computed特性,让其在urls长度等变化时,重新计算图片的宽度
// 因为用户在某些特殊的情况下,需要让文字与相册的宽度相等,所以这里事件的形式对外发送
albumWidth() {
let width = 0
if(this.urls.length === 1) {
width = this.singleWidth
} else {
width = this.showUrls[0].length * this.multipleSize + this.space * (this.showUrls[0].length - 1)
}
this.$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">
@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>