gree_leran/node_modules/uview-plus/components/u-skeleton/u-skeleton.vue

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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>