| <template> | 
|     <view | 
|         class="u-notice" | 
|         @tap="clickHandler" | 
|     > | 
|         <slot name="icon"> | 
|             <view | 
|                 class="u-notice__left-icon" | 
|                 v-if="icon" | 
|             > | 
|                 <u-icon | 
|                     :name="icon" | 
|                     :color="color" | 
|                     size="19" | 
|                 ></u-icon> | 
|             </view> | 
|         </slot> | 
|         <view | 
|             class="u-notice__content" | 
|             ref="u-notice__content" | 
|         > | 
|             <view | 
|                 ref="u-notice__content__text" | 
|                 class="u-notice__content__text" | 
|                 :style="[animationStyle]" | 
|             > | 
|                 <text | 
|                     v-for="(item, index) in innerText" | 
|                     :key="index" | 
|                     :style="[textStyle]" | 
|                 >{{item}}</text> | 
|             </view> | 
|         </view> | 
|         <view | 
|             class="u-notice__right-icon" | 
|             v-if="['link', 'closable'].includes(mode)" | 
|         > | 
|             <u-icon | 
|                 v-if="mode === 'link'" | 
|                 name="arrow-right" | 
|                 :size="17" | 
|                 :color="color" | 
|             ></u-icon> | 
|             <u-icon | 
|                 v-if="mode === 'closable'" | 
|                 @click="close" | 
|                 name="close" | 
|                 :size="16" | 
|                 :color="color" | 
|             ></u-icon> | 
|         </view> | 
|     </view> | 
| </template> | 
| <script> | 
|     import props from './props.js'; | 
|     // #ifdef APP-NVUE | 
|     const animation = uni.requireNativePlugin('animation') | 
|     const dom = uni.requireNativePlugin('dom') | 
|     // #endif | 
|     /** | 
|      * RowNotice 滚动通知中的水平滚动模式 | 
|      * @description 水平滚动 | 
|      * @tutorial https://www.uviewui.com/components/noticeBar.html | 
|      * @property {String | Number}    text            显示的内容,字符串 | 
|      * @property {String}            icon            是否显示左侧的音量图标 (默认 'volume' ) | 
|      * @property {String}            mode            通告模式,link-显示右箭头,closable-显示右侧关闭图标 | 
|      * @property {String}            color            文字颜色,各图标也会使用文字颜色 (默认 '#f9ae3d' ) | 
|      * @property {String}            bgColor            背景颜色 (默认 ''#fdf6ec' ) | 
|      * @property {String | Number}    fontSize        字体大小,单位px (默认 14 ) | 
|      * @property {String | Number}    speed            水平滚动时的滚动速度,即每秒滚动多少px(rpx),这有利于控制文字无论多少时,都能有一个恒定的速度  (默认 80 ) | 
|      *  | 
|      * @event {Function} click 点击通告文字触发 | 
|      * @event {Function} close 点击右侧关闭图标触发 | 
|      * @example  | 
|      */ | 
|     export default { | 
|         name: 'u-row-notice', | 
|         mixins: [uni.$u.mpMixin, uni.$u.mixin,props], | 
|         data() { | 
|             return { | 
|                 animationDuration: '0', // 动画执行时间 | 
|                 animationPlayState: 'paused', // 动画的开始和结束执行 | 
|                 // nvue下,内容发生变化,导致滚动宽度也变化,需要标志为是否需要重新计算宽度 | 
|                 // 不能在内容变化时直接重新计算,因为nvue的animation模块上一次的滚动不是刚好结束,会有影响 | 
|                 nvueInit: true, | 
|                 show: true | 
|             }; | 
|         }, | 
|         watch: { | 
|             text: { | 
|                 immediate: true, | 
|                 handler(newValue, oldValue) { | 
|                     // #ifdef APP-NVUE | 
|                     this.nvueInit = true | 
|                     // #endif | 
|                     // #ifndef APP-NVUE | 
|                     this.vue() | 
|                     // #endif | 
|                      | 
|                     if(!uni.$u.test.string(newValue)) { | 
|                         uni.$u.error('noticebar组件direction为row时,要求text参数为字符串形式') | 
|                     } | 
|                 } | 
|             }, | 
|             fontSize() { | 
|                 // #ifdef APP-NVUE | 
|                 this.nvueInit = true | 
|                 // #endif | 
|                 // #ifndef APP-NVUE | 
|                 this.vue() | 
|                 // #endif | 
|             }, | 
|             speed() { | 
|                 // #ifdef APP-NVUE | 
|                 this.nvueInit = true | 
|                 // #endif | 
|                 // #ifndef APP-NVUE | 
|                 this.vue() | 
|                 // #endif | 
|             } | 
|         }, | 
|         computed: { | 
|             // 文字内容的样式 | 
|             textStyle() { | 
|                 let style = {} | 
|                 style.color = this.color | 
|                 style.fontSize = uni.$u.addUnit(this.fontSize) | 
|                 return style | 
|             }, | 
|             animationStyle() { | 
|                 let style = {} | 
|                 style.animationDuration = this.animationDuration | 
|                 style.animationPlayState = this.animationPlayState | 
|                 return style | 
|             }, | 
|             // 内部对用户传入的数据进一步分割,放到多个text标签循环,否则如果用户传入的字符串很长(100个字符以上) | 
|             // 放在一个text标签中进行滚动,在低端安卓机上,动画可能会出现抖动现象,需要分割到多个text中可解决此问题 | 
|             innerText() { | 
|                 let result = [], | 
|                     // 每组text标签的字符长度 | 
|                     len = 20 | 
|                 const textArr = this.text.split('') | 
|                 for (let i = 0; i < textArr.length; i += len) { | 
|                     // 对拆分的后的text进行slice分割,得到的为数组再进行join拼接为字符串 | 
|                     result.push(textArr.slice(i, i + len).join('')) | 
|                 } | 
|                 return result | 
|             } | 
|         }, | 
|         mounted() { | 
|             // #ifdef APP-PLUS | 
|             // 在APP上(含nvue),监听当前webview是否处于隐藏状态(进入下一页时即为hide状态) | 
|             // 如果webivew隐藏了,为了节省性能的损耗,应停止动画的执行,同时也是为了保持进入下一页返回后,滚动位置保持不变 | 
|             var pages = getCurrentPages() | 
|             var page = pages[pages.length - 1] | 
|             var currentWebview = page.$getAppWebview() | 
|             currentWebview.addEventListener('hide', () => { | 
|                 this.webviewHide = true | 
|             }) | 
|             currentWebview.addEventListener('show', () => { | 
|                 this.webviewHide = false | 
|             }) | 
|             // #endif | 
|   | 
|             this.init() | 
|         }, | 
|         methods: { | 
|             init() { | 
|                 // #ifdef APP-NVUE | 
|                 this.nvue() | 
|                 // #endif | 
|   | 
|                 // #ifndef APP-NVUE | 
|                 this.vue() | 
|                 // #endif | 
|                  | 
|                 if(!uni.$u.test.string(this.text)) { | 
|                     uni.$u.error('noticebar组件direction为row时,要求text参数为字符串形式') | 
|                 } | 
|             }, | 
|             // vue版处理 | 
|             async vue() { | 
|                 // #ifndef APP-NVUE | 
|                 let boxWidth = 0, | 
|                     textWidth = 0 | 
|                 // 进行一定的延时 | 
|                 await uni.$u.sleep() | 
|                 // 查询盒子和文字的宽度 | 
|                 textWidth = (await this.$uGetRect('.u-notice__content__text')).width | 
|                 boxWidth = (await this.$uGetRect('.u-notice__content')).width | 
|                 // 根据t=s/v(时间=路程/速度),这里为何不需要加上#u-notice-box的宽度,因为中设置了.u-notice-content样式中设置了padding-left: 100% | 
|                 // 恰巧计算出来的结果中已经包含了#u-notice-box的宽度 | 
|                 this.animationDuration = `${textWidth / uni.$u.getPx(this.speed)}s` | 
|                 // 这里必须这样开始动画,否则在APP上动画速度不会改变 | 
|                 this.animationPlayState = 'paused' | 
|                 setTimeout(() => { | 
|                     this.animationPlayState = 'running' | 
|                 }, 10) | 
|                 // #endif | 
|             }, | 
|             // nvue版处理 | 
|             async nvue() { | 
|                 // #ifdef APP-NVUE | 
|                 this.nvueInit = false | 
|                 let boxWidth = 0, | 
|                     textWidth = 0 | 
|                 // 进行一定的延时 | 
|                 await uni.$u.sleep() | 
|                 // 查询盒子和文字的宽度 | 
|                 textWidth = (await this.getNvueRect('u-notice__content__text')).width | 
|                 boxWidth = (await this.getNvueRect('u-notice__content')).width | 
|                 // 将文字移动到盒子的右边沿,之所以需要这么做,是因为nvue不支持100%单位,否则可以通过css设置 | 
|                 animation.transition(this.$refs['u-notice__content__text'], { | 
|                     styles: { | 
|                         transform: `translateX(${boxWidth}px)` | 
|                     }, | 
|                 }, () => { | 
|                     // 如果非禁止动画,则开始滚动 | 
|                     !this.stopAnimation && this.loopAnimation(textWidth, boxWidth) | 
|                 }); | 
|                 // #endif | 
|             }, | 
|             loopAnimation(textWidth, boxWidth) { | 
|                 // #ifdef APP-NVUE | 
|                 animation.transition(this.$refs['u-notice__content__text'], { | 
|                     styles: { | 
|                         // 目标移动终点为-textWidth,也即当文字的最右边贴到盒子的左边框的位置 | 
|                         transform: `translateX(-${textWidth}px)` | 
|                     }, | 
|                     // 滚动时间的计算为,时间 = 路程(boxWidth + textWidth) / 速度,最后转为毫秒 | 
|                     duration: (boxWidth + textWidth) / uni.$u.getPx(this.speed) * 1000, | 
|                     delay: 10 | 
|                 }, () => { | 
|                     animation.transition(this.$refs['u-notice__content__text'], { | 
|                         styles: { | 
|                             // 重新将文字移动到盒子的右边沿 | 
|                             transform: `translateX(${this.stopAnimation ? 0 : boxWidth}px)` | 
|                         }, | 
|                     }, () => { | 
|                         // 如果非禁止动画,则继续下一轮滚动 | 
|                         if (!this.stopAnimation) { | 
|                             // 判断是否需要初始化计算尺寸 | 
|                             if (this.nvueInit) { | 
|                                 this.nvue() | 
|                             } else { | 
|                                 this.loopAnimation(textWidth, boxWidth) | 
|                             } | 
|                         } | 
|                     }); | 
|                 }) | 
|                 // #endif | 
|             }, | 
|             getNvueRect(el) { | 
|                 // #ifdef APP-NVUE | 
|                 // 返回一个promise | 
|                 return new Promise(resolve => { | 
|                     dom.getComponentRect(this.$refs[el], (res) => { | 
|                         resolve(res.size) | 
|                     }) | 
|                 }) | 
|                 // #endif | 
|             }, | 
|             // 点击通告栏 | 
|             clickHandler(index) { | 
|                 this.$emit('click') | 
|             }, | 
|             // 点击右侧按钮,需要判断点击的是关闭图标还是箭头图标 | 
|             close() { | 
|                 this.$emit('close') | 
|             } | 
|         }, | 
|         // #ifdef APP-NVUE | 
|         beforeDestroy() { | 
|             this.stopAnimation = true | 
|         }, | 
|         // #endif | 
|     }; | 
| </script> | 
|   | 
| <style lang="scss" scoped> | 
|     @import "../../libs/css/components.scss"; | 
|   | 
|     .u-notice { | 
|         @include flex; | 
|         align-items: center; | 
|         justify-content: space-between; | 
|   | 
|         &__left-icon { | 
|             align-items: center; | 
|             margin-right: 5px; | 
|         } | 
|   | 
|         &__right-icon { | 
|             margin-left: 5px; | 
|             align-items: center; | 
|         } | 
|   | 
|         &__content { | 
|             text-align: right; | 
|             flex: 1; | 
|             @include flex; | 
|             flex-wrap: nowrap; | 
|             overflow: hidden; | 
|   | 
|             &__text { | 
|                 font-size: 14px; | 
|                 color: $u-warning; | 
|                 /* #ifndef APP-NVUE */ | 
|                 // 这一句很重要,为了能让滚动左右连接起来 | 
|                 padding-left: 100%; | 
|                 word-break: keep-all; | 
|                 white-space: nowrap; | 
|                 animation: u-loop-animation 10s linear infinite both; | 
|                 /* #endif */ | 
|                 @include flex(row); | 
|             } | 
|         } | 
|   | 
|     } | 
|   | 
|     @keyframes u-loop-animation { | 
|         0% { | 
|             transform: translate3d(0, 0, 0); | 
|         } | 
|   | 
|         100% { | 
|             transform: translate3d(-100%, 0, 0); | 
|         } | 
|     } | 
| </style> |