<template>
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<view
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v-if="show"
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class="u-notice-bar"
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:style="{
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background: computeBgColor,
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padding: padding
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}"
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:class="[
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type ? `u-type-${type}-light-bg` : ''
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]"
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>
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<view class="u-direction-row">
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<view class="u-icon-wrap">
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<u-icon class="u-left-icon" v-if="volumeIcon" name="volume-fill" :size="volumeSize" :color="computeColor"></u-icon>
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</view>
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<view class="u-notice-box" id="u-notice-box">
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<view
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class="u-notice-content"
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id="u-notice-content"
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:style="{
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animationDuration: animationDuration,
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animationPlayState: animationPlayState,
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}"
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>
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<text class="u-notice-text" @tap="click" :style="[textStyle]"
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:class="['u-type-' + type]">{{showText}}</text>
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</view>
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</view>
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<view class="u-icon-wrap">
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<u-icon @click="getMore" class="u-right-icon" v-if="moreIcon" name="arrow-right" :size="26" :color="computeColor"></u-icon>
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<u-icon @click="close" class="u-right-icon" v-if="closeIcon" name="close" :size="24" :color="computeColor"></u-icon>
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</view>
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</view>
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</view>
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</template>
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<script>
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export default {
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props: {
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// 显示的内容，数组
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list: {
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type: Array,
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default() {
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return [];
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}
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},
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// 显示的主题，success|error|primary|info|warning|none
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// none主题默认为透明背景，黑色(contentColor)字体
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type: {
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type: String,
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default: 'warning'
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},
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// 是否显示左侧的音量图标
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volumeIcon: {
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type: Boolean,
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default: true
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},
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// 是否显示右侧的右箭头图标
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moreIcon: {
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type: Boolean,
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default: false
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},
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// 是否显示右侧的关闭图标
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closeIcon: {
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type: Boolean,
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default: false
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},
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// 是否自动播放
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autoplay: {
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type: Boolean,
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default: true
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},
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// 文字颜色，各图标也会使用文字颜色
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color: {
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type: String,
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default: ''
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},
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// 背景颜色
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bgColor: {
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type: String,
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default: ''
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},
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// 是否显示
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show: {
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type: Boolean,
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default: true
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},
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// 字体大小，单位rpx
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fontSize: {
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type: [Number, String],
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default: 26
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},
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// 音量喇叭的大小
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volumeSize: {
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type: [Number, String],
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default: 34
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},
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// 水平滚动时的滚动速度，即每秒滚动多少rpx，这有利于控制文字无论多少时，都能有一个恒定的速度
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speed: {
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type: [Number, String],
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default: 160
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},
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// 播放状态，play-播放，paused-暂停
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playState: {
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type: String,
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default: 'play'
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},
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// 通知的边距
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padding: {
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type: [Number, String],
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default: '18rpx 24rpx'
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}
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},
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data() {
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return {
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textWidth: 0, // 滚动的文字宽度
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boxWidth: 0, // 供文字滚动的父盒子的宽度，和前者一起为了计算滚动速度
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animationDuration: '10s', // 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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showText: '' // 显示的文本
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};
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},
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watch: {
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list: {
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immediate: true,
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handler(val) {
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this.showText = val.join('，');
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this.$nextTick(() => {
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this.initSize();
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});
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}
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},
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playState(val) {
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if(val == 'play') this.animationPlayState = 'running';
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else this.animationPlayState = 'paused';
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},
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speed(val) {
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this.initSize();
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}
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},
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computed: {
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// 计算字体颜色，如果没有自定义的，就用uview主题颜色
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computeColor() {
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if (this.color) return this.color;
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// 如果是无主题，就默认使用content-color
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else if(this.type == 'none') return '#606266';
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else return this.type;
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},
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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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if (this.color) style.color = this.color;
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else if(this.type == 'none') style.color = '#606266';
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style.fontSize = this.fontSize + 'rpx';
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return style;
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},
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// 计算背景颜色
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computeBgColor() {
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if (this.bgColor) return this.bgColor;
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else if(this.type == 'none') return 'transparent';
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}
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},
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mounted() {
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this.$nextTick(() => {
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this.initSize();
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});
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},
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methods: {
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initSize() {
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let query = [],
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boxWidth = 0,
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textWidth = 0;
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let textQuery = new Promise((resolve, reject) => {
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uni.createSelectorQuery()
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.in(this)
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.select(`#u-notice-content`)
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.boundingClientRect()
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.exec(ret => {
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this.textWidth = ret[0].width;
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resolve();
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});
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});
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query.push(textQuery);
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Promise.all(query).then(() => {
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// 根据t=s/v(时间=路程/速度)，这里为何不需要加上#u-notice-box的宽度，因为中设置了.u-notice-content样式中设置了padding-left: 100%
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// 恰巧计算出来的结果中已经包含了#u-notice-box的宽度
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this.animationDuration = `${this.textWidth / uni.upx2px(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(HX版本2.4.6，IOS13)
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this.animationPlayState = 'paused';
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setTimeout(() => {
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if(this.playState == 'play' && this.autoplay) this.animationPlayState = 'running';
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}, 10);
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});
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},
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// 点击通告栏
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click(index) {
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this.$emit('click');
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},
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// 点击关闭按钮
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close() {
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this.$emit('close');
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},
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// 点击更多箭头按钮
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getMore() {
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this.$emit('getMore');
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}
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}
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};
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</script>
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<style lang="scss" scoped>
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@import "../../libs/css/style.components.scss";
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.u-notice-bar {
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padding: 18rpx 24rpx;
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overflow: hidden;
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}
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.u-direction-row {
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@include vue-flex;
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align-items: center;
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justify-content: space-between;
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}
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.u-left-icon {
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/* #ifndef APP-NVUE */
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display: inline-flex;
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/* #endif */
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align-items: center;
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}
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.u-notice-box {
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flex: 1;
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@include vue-flex;
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overflow: hidden;
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margin-left: 12rpx;
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}
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.u-right-icon {
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margin-left: 12rpx;
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display: inline-flex;
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align-items: center;
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}
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.u-notice-content {
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animation: u-loop-animation 10s linear infinite both;
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text-align: right;
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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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@include vue-flex;
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flex-wrap: nowrap;
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}
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.u-notice-text {
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font-size: 26rpx;
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word-break: keep-all;
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white-space: nowrap
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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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