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<template>
<view class="u-skeleton">
<view
class="u-skeleton__wrapper"
ref="u-skeleton__wrapper"
v-if="loading"
style="display: flex; flex-direction: row;"
>
<view
class="u-skeleton__wrapper__avatar"
v-if="avatar"
:class="[`u-skeleton__wrapper__avatar--${avatarShape}`, animate && 'animate']"
:style="{
height: addUnit(avatarSize),
width: addUnit(avatarSize)
}"
></view>
<view
class="u-skeleton__wrapper__content"
ref="u-skeleton__wrapper__content"
style="flex: 1;"
>
<view
class="u-skeleton__wrapper__content__title"
v-if="title"
:style="{
width: uTitleWidth,
height: addUnit(titleHeight),
}"
:class="[animate && 'animate']"
></view>
<view
class="u-skeleton__wrapper__content__rows"
:class="[animate && 'animate']"
v-for="(item, index) in rowsArray"
:key="index"
:style="{
width: item.width,
height: item.height,
marginTop: item.marginTop
}"
>
</view>
</view>
</view>
<slot v-else />
</view>
</template>
<script>
import { props } from './props';
import { mpMixin } from '../../libs/mixin/mpMixin';
import { mixin } from '../../libs/mixin/mixin';
import { addUnit, sleep, error } from '../../libs/function/index';
import test from '../../libs/function/test';
// #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')
const animation = uni.requireNativePlugin('animation')
// #endif
/**
* Skeleton 骨架屏
* @description 骨架屏一般用于页面在请求远程数据尚未完成时页面用灰色块预显示本来的页面结构给用户更好的体验
* @tutorial https://ijry.github.io/uview-plus/components/skeleton.html
* @property {Boolean} loading 是否显示骨架占位图设置为false将会展示子组件内容 (默认 true )
* @property {Boolean} animate 是否开启动画效果 (默认 true )
* @property {String | Number} rows 段落占位图行数 (默认 0 )
* @property {String | Number | Array} rowsWidth 段落占位图的宽度可以为百分比数值带单位字符串等可通过数组传入指定每个段落行的宽度 (默认 '100%' )
* @property {String | Number | Array} rowsHeight 段落的高度 (默认 18 )
* @property {Boolean} title 是否展示标题占位图 (默认 true )
* @property {String | Number} titleWidth 标题的宽度 (默认 '50%' )
* @property {String | Number} titleHeight 标题的高度 (默认 18 )
* @property {Boolean} avatar 是否展示头像占位图 (默认 false )
* @property {String | Number} avatarSize 头像占位图大小 (默认 32 )
* @property {String} avatarShape 头像占位图的形状circle-圆形square-方形 (默认 'circle' )
* @example <u-search placeholder="日照香炉生紫烟" v-model="keyword"></u-search>
*/
export default {
name: 'u-skeleton',
mixins: [mpMixin, mixin, props],
data() {
return {
width: 0,
}
},
watch: {
loading() {
this.getComponentWidth()
}
},
computed: {
rowsArray() {
if (/%$/.test(this.rowsHeight)) {
error('rowsHeight参数不支持百分比单位')
}
const rows = []
for (let i = 0; i < this.rows; i++) {
let item = {},
// 需要预防超出数组边界的情况
rowWidth = test.array(this.rowsWidth) ? (this.rowsWidth[i] || (i === this.rows - 1 ? '70%' : '100%')) : i ===
this.rows - 1 ? '70%' : this.rowsWidth,
rowHeight = test.array(this.rowsHeight) ? (this.rowsHeight[i] || '18px') : this.rowsHeight
// 如果有title占位图第一个段落占位图的外边距需要大一些如果没有title占位图第一个段落占位图则无需外边距
// 之所以需要这么做是因为weex的无能以提升性能为借口不支持css的一些伪类
item.marginTop = !this.title && i === 0 ? 0 : this.title && i === 0 ? '20px' : '12px'
// 如果设置的为百分比的宽度转换为px值因为nvue不支持百分比单位
if (/%$/.test(rowWidth)) {
// 通过parseInt提取出百分比单位中的数值部分除以100得到百分比的小数值
item.width = addUnit(this.width * parseInt(rowWidth) / 100)
} else {
item.width = addUnit(rowWidth)
}
item.height = addUnit(rowHeight)
rows.push(item)
}
// console.log(rows);
return rows
},
uTitleWidth() {
let tWidth = 0
if (/%$/.test(this.titleWidth)) {
// 通过parseInt提取出百分比单位中的数值部分除以100得到百分比的小数值
tWidth = addUnit(this.width * parseInt(this.titleWidth) / 100)
} else {
tWidth = addUnit(this.titleWidth)
}
return addUnit(tWidth)
},
},
mounted() {
this.init()
},
methods: {
addUnit,
init() {
this.getComponentWidth()
// #ifdef APP-NVUE
this.loading && this.animate && this.setNvueAnimation()
// #endif
},
async setNvueAnimation() {
// #ifdef APP-NVUE
// 为了让opacity:1的状态保持一定时间这里做一个延时
await sleep(500)
const skeleton = this.$refs['u-skeleton__wrapper'];
skeleton && this.loading && this.animate && animation.transition(skeleton, {
styles: {
opacity: 0.5
},
duration: 600,
}, () => {
// 这里无需判断是否loading和开启动画状态因为最终的状态必须达到opacity: 1否则可能
// 会停留在opacity: 0.5的状态中
animation.transition(skeleton, {
styles: {
opacity: 1
},
duration: 600,
}, () => {
// 只有在loading中时才执行动画
this.loading && this.animate && this.setNvueAnimation()
})
})
// #endif
},
// 获取组件的宽度
async getComponentWidth() {
// 延时一定时间以获取dom尺寸
await sleep(20)
// #ifndef APP-NVUE
this.$uGetRect('.u-skeleton__wrapper__content').then(size => {
this.width = size.width
})
// #endif
// #ifdef APP-NVUE
const ref = this.$refs['u-skeleton__wrapper__content']
ref && dom.getComponentRect(ref, (res) => {
this.width = res.size.width
})
// #endif
}
}
}
</script>
<style lang="scss" scoped>
@import "../../libs/css/components.scss";
@mixin background {
/* #ifdef APP-NVUE */
background-color: #F1F2F4;
/* #endif */
/* #ifndef APP-NVUE */
background: linear-gradient(90deg, #F1F2F4 25%, #e6e6e6 37%, #F1F2F4 50%);
background-size: 400% 100%;
/* #endif */
}
.u-skeleton {
flex: 1;
&__wrapper {
@include flex(row);
&__avatar {
@include background;
margin-right: 15px;
&--circle {
border-radius: 100px;
}
&--square {
border-radius: 4px;
}
}
&__content {
flex: 1;
&__rows,
&__title {
@include background;
border-radius: 3px;
}
}
}
}
/* #ifndef APP-NVUE */
.animate {
animation: skeleton 1.8s ease infinite
}
@keyframes skeleton {
0% {
background-position: 100% 50%
}
100% {
background-position: 0 50%
}
}
/* #endif */
</style>