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331 lines
9.1 KiB
331 lines
9.1 KiB
2 years ago
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<template>
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<view
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class="u-notice"
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@tap="clickHandler"
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>
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<slot name="icon">
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<view
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class="u-notice__left-icon"
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v-if="icon"
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>
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<u-icon
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:name="icon"
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:color="color"
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size="19"
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></u-icon>
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</view>
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</slot>
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<view
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class="u-notice__content"
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ref="u-notice__content"
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>
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<view
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ref="u-notice__content__text"
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class="u-notice__content__text"
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:style="[animationStyle]"
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>
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<text
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v-for="(item, index) in innerText"
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:key="index"
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:style="[textStyle]"
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>{{item}}</text>
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</view>
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</view>
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<view
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class="u-notice__right-icon"
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v-if="['link', 'closable'].includes(mode)"
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>
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<u-icon
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v-if="mode === 'link'"
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name="arrow-right"
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:size="17"
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:color="color"
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></u-icon>
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<u-icon
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v-if="mode === 'closable'"
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@click="close"
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name="close"
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:size="16"
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:color="color"
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></u-icon>
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</view>
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</view>
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</template>
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<script>
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import props from './props.js';
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// #ifdef APP-NVUE
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const animation = uni.requireNativePlugin('animation')
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const dom = uni.requireNativePlugin('dom')
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// #endif
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/**
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* RowNotice 滚动通知中的水平滚动模式
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* @description 水平滚动
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* @tutorial https://www.uviewui.com/components/noticeBar.html
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* @property {String | Number} text 显示的内容，字符串
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* @property {String} icon 是否显示左侧的音量图标 (默认 'volume' )
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* @property {String} mode 通告模式，link-显示右箭头，closable-显示右侧关闭图标
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* @property {String} color 文字颜色，各图标也会使用文字颜色 (默认 '#f9ae3d' )
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* @property {String} bgColor 背景颜色 (默认 ''#fdf6ec' )
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* @property {String | Number} fontSize 字体大小，单位px (默认 14 )
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* @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 )
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*
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* @event {Function} click 点击通告文字触发
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* @event {Function} close 点击右侧关闭图标触发
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* @example
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*/
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export default {
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name: 'u-row-notice',
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mixins: [uni.$u.mpMixin, uni.$u.mixin,props],
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data() {
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return {
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animationDuration: '0', // 动画执行时间
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animationPlayState: 'paused', // 动画的开始和结束执行
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// 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
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// 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
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nvueInit: true,
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show: true
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};
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},
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watch: {
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text: {
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immediate: true,
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handler(newValue, oldValue) {
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// #ifdef APP-NVUE
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this.nvueInit = true
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// #endif
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// #ifndef APP-NVUE
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this.vue()
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// #endif
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if(!uni.$u.test.string(newValue)) {
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uni.$u.error('noticebar组件direction为row时，要求text参数为字符串形式')
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}
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}
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},
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fontSize() {
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// #ifdef APP-NVUE
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this.nvueInit = true
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// #endif
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// #ifndef APP-NVUE
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this.vue()
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// #endif
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},
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speed() {
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// #ifdef APP-NVUE
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this.nvueInit = true
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// #endif
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// #ifndef APP-NVUE
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this.vue()
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// #endif
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}
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},
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computed: {
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// 文字内容的样式
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textStyle() {
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let style = {}
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style.color = this.color
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style.fontSize = uni.$u.addUnit(this.fontSize)
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return style
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},
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animationStyle() {
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let style = {}
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style.animationDuration = this.animationDuration
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style.animationPlayState = this.animationPlayState
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return style
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},
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// 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）
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// 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
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innerText() {
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let result = [],
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// 每组text标签的字符长度
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len = 20
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const textArr = this.text.split('')
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for (let i = 0; i < textArr.length; i += len) {
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// 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
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result.push(textArr.slice(i, i + len).join(''))
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}
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return result
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}
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},
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mounted() {
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// #ifdef APP-PLUS
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// 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)
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// 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
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var pages = getCurrentPages()
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var page = pages[pages.length - 1]
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var currentWebview = page.$getAppWebview()
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currentWebview.addEventListener('hide', () => {
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this.webviewHide = true
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})
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currentWebview.addEventListener('show', () => {
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this.webviewHide = false
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})
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// #endif
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this.init()
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},
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methods: {
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init() {
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// #ifdef APP-NVUE
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this.nvue()
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// #endif
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// #ifndef APP-NVUE
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this.vue()
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// #endif
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if(!uni.$u.test.string(this.text)) {
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uni.$u.error('noticebar组件direction为row时，要求text参数为字符串形式')
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}
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},
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// vue版处理
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async vue() {
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// #ifndef APP-NVUE
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let boxWidth = 0,
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textWidth = 0
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// 进行一定的延时
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await uni.$u.sleep()
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// 查询盒子和文字的宽度
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textWidth = (await this.$uGetRect('.u-notice__content__text')).width
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boxWidth = (await this.$uGetRect('.u-notice__content')).width
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// 根据t=s/v(时间=路程/速度)，这里为何不需要加上#u-notice-box的宽度，因为中设置了.u-notice-content样式中设置了padding-left: 100%
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// 恰巧计算出来的结果中已经包含了#u-notice-box的宽度
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this.animationDuration = `${textWidth / uni.$u.getPx(this.speed)}s`
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// 这里必须这样开始动画，否则在APP上动画速度不会改变
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this.animationPlayState = 'paused'
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setTimeout(() => {
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this.animationPlayState = 'running'
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}, 10)
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// #endif
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},
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// nvue版处理
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async nvue() {
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// #ifdef APP-NVUE
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this.nvueInit = false
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let boxWidth = 0,
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textWidth = 0
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// 进行一定的延时
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await uni.$u.sleep()
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// 查询盒子和文字的宽度
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textWidth = (await this.getNvueRect('u-notice__content__text')).width
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boxWidth = (await this.getNvueRect('u-notice__content')).width
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// 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
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animation.transition(this.$refs['u-notice__content__text'], {
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styles: {
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transform: `translateX(${boxWidth}px)`
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},
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}, () => {
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// 如果非禁止动画，则开始滚动
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!this.stopAnimation && this.loopAnimation(textWidth, boxWidth)
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});
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// #endif
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},
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loopAnimation(textWidth, boxWidth) {
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// #ifdef APP-NVUE
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animation.transition(this.$refs['u-notice__content__text'], {
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styles: {
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// 目标移动终点为-textWidth，也即当文字的最右边贴到盒子的左边框的位置
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transform: `translateX(-${textWidth}px)`
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},
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// 滚动时间的计算为，时间 = 路程(boxWidth + textWidth) / 速度，最后转为毫秒
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duration: (boxWidth + textWidth) / uni.$u.getPx(this.speed) * 1000,
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delay: 10
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}, () => {
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animation.transition(this.$refs['u-notice__content__text'], {
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styles: {
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// 重新将文字移动到盒子的右边沿
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transform: `translateX(${this.stopAnimation ? 0 : boxWidth}px)`
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},
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}, () => {
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// 如果非禁止动画，则继续下一轮滚动
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if (!this.stopAnimation) {
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// 判断是否需要初始化计算尺寸
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if (this.nvueInit) {
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this.nvue()
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} else {
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this.loopAnimation(textWidth, boxWidth)
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}
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}
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});
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})
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// #endif
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},
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getNvueRect(el) {
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// #ifdef APP-NVUE
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// 返回一个promise
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return new Promise(resolve => {
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dom.getComponentRect(this.$refs[el], (res) => {
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resolve(res.size)
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})
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})
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// #endif
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},
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// 点击通告栏
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clickHandler(index) {
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this.$emit('click')
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},
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// 点击右侧按钮，需要判断点击的是关闭图标还是箭头图标
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close() {
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this.$emit('close')
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}
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},
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// #ifdef APP-NVUE
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beforeDestroy() {
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this.stopAnimation = true
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},
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// #endif
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};
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</script>
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<style lang="scss" scoped>
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@import "../../libs/css/components.scss";
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.u-notice {
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@include flex;
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align-items: center;
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justify-content: space-between;
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&__left-icon {
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align-items: center;
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margin-right: 5px;
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}
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&__right-icon {
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margin-left: 5px;
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align-items: center;
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}
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&__content {
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text-align: right;
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flex: 1;
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@include flex;
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flex-wrap: nowrap;
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overflow: hidden;
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&__text {
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font-size: 14px;
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color: $u-warning;
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/* #ifndef APP-NVUE */
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// 这一句很重要，为了能让滚动左右连接起来
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padding-left: 100%;
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word-break: keep-all;
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white-space: nowrap;
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animation: u-loop-animation 10s linear infinite both;
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/* #endif */
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@include flex(row);
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}
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}
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}
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@keyframes u-loop-animation {
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0% {
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transform: translate3d(0, 0, 0);
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}
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100% {
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transform: translate3d(-100%, 0, 0);
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}
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}
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</style>
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