<template>
<view
class="u-loading-icon"
:style="[$u.addStyle(customStyle)]"
:class="[vertical && 'u-loading-icon--vertical']"
v-if="show"
>
<view
v-if="!webviewHide"
class="u-loading-icon__spinner"
:class="[`u-loading-icon__spinner--${mode}`]"
ref="ani"
:style="{
color: color,
width: $u.addUnit(size),
height: $u.addUnit(size),
borderTopColor: color,
borderBottomColor: otherBorderColor,
borderLeftColor: otherBorderColor,
borderRightColor: otherBorderColor,
'animation-duration': `${duration}ms`,
'animation-timing-function': mode === 'semicircle' || mode === 'circle' ? timingFunction : ''
}"
>
<block v-if="mode === 'spinner'">
<!-- #ifndef APP-NVUE -->
<view
v-for="(item, index) in array12"
:key="index"
class="u-loading-icon__dot"
>
</view>
<!-- #endif -->
<!-- #ifdef APP-NVUE -->
<!-- 此组件内部图标部分无法设置宽高，即使通过width和height配置了也无效 -->
<loading-indicator
v-if="!webviewHide"
class="u-loading-indicator"
:animating="true"
:style="{
color: color,
width: $u.addUnit(size),
height: $u.addUnit(size)
}"
/>
<!-- #endif -->
</block>
</view>
<text
v-if="text"
class="u-loading-icon__text"
:style="{
fontSize: $u.addUnit(textSize),
color: textColor,
}"
>{{text}}</text>
</view>
</template>
<script>
import props from './props.js';
// #ifdef APP-NVUE
const animation = weex.requireModule('animation');
// #endif
/**
* loading 加载动画
* @description 警此组件为一个小动画，目前用在uView的loadmore加载更多和switch开关等组件的正在加载状态场景。
* @tutorial https://www.uviewui.com/components/loading.html
* @property {Boolean} show 是否显示组件 (默认 true)
* @property {String} color 动画活动区域的颜色，只对 mode = flower 模式有效（默认color['u-tips-color']）
* @property {String} textColor 提示文本的颜色（默认color['u-tips-color']）
* @property {Boolean} vertical 文字和图标是否垂直排列 (默认 false )
* @property {String} mode 模式选择，见官网说明（默认 'circle' ）
* @property {String | Number} size 加载图标的大小，单位px （默认 24 ）
* @property {String | Number} textSize 文字大小（默认 15 ）
* @property {String | Number} text 文字内容
* @property {String} timingFunction 动画模式 （默认 'ease-in-out' ）
* @property {String | Number} duration 动画执行周期时间（默认 1200）
* @property {String} inactiveColor mode=circle时的暗边颜色
* @property {Object} customStyle 定义需要用到的外部样式
* @example <u-loading mode="circle"></u-loading>
*/
export default {
name: 'u-loading-icon',
mixins: [uni.$u.mpMixin, uni.$u.mixin, props],
data() {
return {
// Array.form可以通过一个伪数组对象创建指定长度的数组
// https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Array/from
array12: Array.from({
length: 12
}),
// 这里需要设置默认值为360，否则在安卓nvue上，会延迟一个duration周期后才执行
// 在iOS nvue上，则会一开始默认执行两个周期的动画
aniAngel: 360, // 动画旋转角度
webviewHide: false, // 监听webview的状态，如果隐藏了页面，则停止动画，以免性能消耗
loading: false, // 是否运行中，针对nvue使用
}
},
computed: {
// 当为circle类型时，给其另外三边设置一个更轻一些的颜色
// 之所以需要这么做的原因是，比如父组件传了color为红色，那么需要另外的三个边为浅红色
// 而不能是固定的某一个其他颜色(因为这个固定的颜色可能浅蓝，导致效果没有那么细腻良好)
otherBorderColor() {
const lightColor = uni.$u.colorGradient(this.color, '#ffffff', 100)[80]
if (this.mode === 'circle') {
return this.inactiveColor ? this.inactiveColor : lightColor
} else {
return 'transparent'
}
// return this.mode === 'circle' ? this.inactiveColor ? this.inactiveColor : lightColor : 'transparent'
}
},
watch: {
show(n) {
// nvue中，show为true，且为非loading状态，就重新执行动画模块
// #ifdef APP-NVUE
if (n && !this.loading) {
setTimeout(() => {
this.startAnimate()
}, 30)
}
// #endif
}
},
mounted() {
this.init()
},
methods: {
init() {
setTimeout(() => {
// #ifdef APP-NVUE
this.show && this.nvueAnimate()
// #endif
// #ifdef APP-PLUS
this.show && this.addEventListenerToWebview()
// #endif
}, 20)
},
// 监听webview的显示与隐藏
addEventListenerToWebview() {
// webview的堆栈
const pages = getCurrentPages()
// 当前页面
const page = pages[pages.length - 1]
// 当前页面的webview实例
const currentWebview = page.$getAppWebview()
// 监听webview的显示与隐藏，从而停止或者开始动画(为了性能)
currentWebview.addEventListener('hide', () => {
this.webviewHide = true
})
currentWebview.addEventListener('show', () => {
this.webviewHide = false
})
},
// #ifdef APP-NVUE
nvueAnimate() {
// nvue下，非spinner类型时才需要旋转，因为nvue的spinner类型，使用了weex的
// loading-indicator组件，自带旋转功能
this.mode !== 'spinner' && this.startAnimate()
},
// 执行nvue的animate模块动画
startAnimate() {
this.loading = true
const ani = this.$refs.ani
if (!ani) return
animation.transition(ani, {
// 进行角度旋转
styles: {
transform: `rotate(${this.aniAngel}deg)`,
transformOrigin: 'center center'
},
duration: this.duration,
timingFunction: this.timingFunction,
// delay: 10
}, () => {
// 每次增加360deg，为了让其重新旋转一周
this.aniAngel += 360
// 动画结束后，继续循环执行动画，需要同时判断webviewHide变量
// nvue安卓，页面隐藏后依然会继续执行startAnimate方法
this.show && !this.webviewHide ? this.startAnimate() : this.loading = false
})
}
// #endif
}
}
</script>
<style lang="scss" scoped>
@import "../../libs/css/components.scss";
$u-loading-icon-color: #c8c9cc !default;
$u-loading-icon-text-margin-left:4px !default;
$u-loading-icon-text-color:$u-content-color !default;
$u-loading-icon-text-font-size:14px !default;
$u-loading-icon-text-line-height:20px !default;
$u-loading-width:30px !default;
$u-loading-height:30px !default;
$u-loading-max-width:100% !default;
$u-loading-max-height:100% !default;
$u-loading-semicircle-border-width: 2px !default;
$u-loading-semicircle-border-color:transparent !default;
$u-loading-semicircle-border-top-right-radius: 100px !default;
$u-loading-semicircle-border-top-left-radius: 100px !default;
$u-loading-semicircle-border-bottom-left-radius: 100px !default;
$u-loading-semicircle-border-bottom-right-radiu: 100px !default;
$u-loading-semicircle-border-style: solid !default;
$u-loading-circle-border-top-right-radius: 100px !default;
$u-loading-circle-border-top-left-radius: 100px !default;
$u-loading-circle-border-bottom-left-radius: 100px !default;
$u-loading-circle-border-bottom-right-radiu: 100px !default;
$u-loading-circle-border-width:2px !default;
$u-loading-circle-border-top-color:#e5e5e5 !default;
$u-loading-circle-border-right-color:$u-loading-circle-border-top-color !default;
$u-loading-circle-border-bottom-color:$u-loading-circle-border-top-color !default;
$u-loading-circle-border-left-color:$u-loading-circle-border-top-color !default;
$u-loading-circle-border-style:solid !default;
$u-loading-icon-host-font-size:0px !default;
$u-loading-icon-host-line-height:1 !default;
$u-loading-icon-vertical-margin:6px 0 0 !default;
$u-loading-icon-dot-top:0 !default;
$u-loading-icon-dot-left:0 !default;
$u-loading-icon-dot-width:100% !default;
$u-loading-icon-dot-height:100% !default;
$u-loading-icon-dot-before-width:2px !default;
$u-loading-icon-dot-before-height:25% !default;
$u-loading-icon-dot-before-margin:0 auto !default;
$u-loading-icon-dot-before-background-color:currentColor !default;
$u-loading-icon-dot-before-border-radius:40% !default;
.u-loading-icon {
/* #ifndef APP-NVUE */
// display: inline-flex;
/* #endif */
flex-direction: row;
align-items: center;
justify-content: center;
color: $u-loading-icon-color;
&__text {
margin-left: $u-loading-icon-text-margin-left;
color: $u-loading-icon-text-color;
font-size: $u-loading-icon-text-font-size;
line-height: $u-loading-icon-text-line-height;
}
&__spinner {
width: $u-loading-width;
height: $u-loading-height;
position: relative;
/* #ifndef APP-NVUE */
box-sizing: border-box;
max-width: $u-loading-max-width;
max-height: $u-loading-max-height;
animation: u-rotate 1s linear infinite;
/* #endif */
}
&__spinner--semicircle {
border-width: $u-loading-semicircle-border-width;
border-color: $u-loading-semicircle-border-color;
border-top-right-radius: $u-loading-semicircle-border-top-right-radius;
border-top-left-radius: $u-loading-semicircle-border-top-left-radius;
border-bottom-left-radius: $u-loading-semicircle-border-bottom-left-radius;
border-bottom-right-radius: $u-loading-semicircle-border-bottom-right-radiu;
border-style: $u-loading-semicircle-border-style;
}
&__spinner--circle {
border-top-right-radius: $u-loading-circle-border-top-right-radius;
border-top-left-radius: $u-loading-circle-border-top-left-radius;
border-bottom-left-radius: $u-loading-circle-border-bottom-left-radius;
border-bottom-right-radius: $u-loading-circle-border-bottom-right-radiu;
border-width: $u-loading-circle-border-width;
border-top-color: $u-loading-circle-border-top-color;
border-right-color: $u-loading-circle-border-right-color;
border-bottom-color: $u-loading-circle-border-bottom-color;
border-left-color: $u-loading-circle-border-left-color;
border-style: $u-loading-circle-border-style;
}
&--vertical {
flex-direction: column
}
}
/* #ifndef APP-NVUE */
:host {
font-size: $u-loading-icon-host-font-size;
line-height: $u-loading-icon-host-line-height;
}
.u-loading-icon {
&__spinner--spinner {
animation-timing-function: steps(12)
}
&__text:empty {
display: none
}
&--vertical &__text {
margin: $u-loading-icon-vertical-margin;
color: $u-content-color;
}
&__dot {
position: absolute;
top: $u-loading-icon-dot-top;
left: $u-loading-icon-dot-left;
width: $u-loading-icon-dot-width;
height: $u-loading-icon-dot-height;
&:before {
display: block;
width: $u-loading-icon-dot-before-width;
height: $u-loading-icon-dot-before-height;
margin: $u-loading-icon-dot-before-margin;
background-color: $u-loading-icon-dot-before-background-color;
border-radius: $u-loading-icon-dot-before-border-radius;
content: " "
}
}
}
@for $i from 1 through 12 {
.u-loading-icon__dot:nth-of-type(#{$i}) {
transform: rotate($i * 30deg);
opacity: 1 - 0.0625 * ($i - 1);
}
}
@keyframes u-rotate {
0% {
transform: rotate(0deg)
}
to {
transform: rotate(1turn)
}
}
/* #endif */
</style>