u-row-notice

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<template>
  <view
    v-if="show"
    class="u-notice-bar"
    :style="{
			background: computeBgColor,
			padding: padding
		}"
    :class="[
			type ? `u-type-${type}-light-bg` : ''
		]"
  >
    <view class="u-direction-row">
      <view class="u-icon-wrap">
        <u-icon
          class="u-left-icon"
          v-if="volumeIcon"
          name="volume-fill"
          :size="volumeSize"
          :color="computeColor"
        ></u-icon>
      </view>
      <view class="u-notice-box" id="u-notice-box">
        <view
          class="u-notice-content"
          id="u-notice-content"
          :style="{
						animationDuration: animationDuration,
						animationPlayState: animationPlayState,
					}"
        >
          <text
            class="u-notice-text"
            @tap="click"
            :style="[textStyle]"
            :class="['u-type-' + type]"
          >{{showText}}</text>
        </view>
      </view>
      <view class="u-icon-wrap">
        <u-icon
          @click="getMore"
          class="u-right-icon"
          v-if="moreIcon"
          name="arrow-right"
          :size="26"
          :color="computeColor"
        ></u-icon>
        <u-icon
          @click="close"
          class="u-right-icon"
          v-if="closeIcon"
          name="close"
          :size="24"
          :color="computeColor"
        ></u-icon>
      </view>
    </view>
  </view>
</template>
<script>
export default {
  props: {
    // 显示的内容,数组
    list: {
      type: Array,
      default() {
        return []
      }
    },
    // 显示的主题,success|error|primary|info|warning|none
    // none主题默认为透明背景,黑色(contentColor)字体
    type: {
      type: String,
      default: 'warning'
    },
    // 是否显示左侧的音量图标
    volumeIcon: {
      type: Boolean,
      default: true
    },
    // 是否显示右侧的右箭头图标
    moreIcon: {
      type: Boolean,
      default: false
    },
    // 是否显示右侧的关闭图标
    closeIcon: {
      type: Boolean,
      default: false
    },
    // 是否自动播放
    autoplay: {
      type: Boolean,
      default: true
    },
    // 文字颜色,各图标也会使用文字颜色
    color: {
      type: String,
      default: ''
    },
    // 背景颜色
    bgColor: {
      type: String,
      default: ''
    },
    // 是否显示
    show: {
      type: Boolean,
      default: true
    },
    // 字体大小,单位rpx
    fontSize: {
      type: [Number, String],
      default: 13
    },
    // 音量喇叭的大小
    volumeSize: {
      type: [Number, String],
      default: 17
    },
    // 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
    speed: {
      type: [Number, String],
      default: 160
    },
    // 播放状态,play-播放,paused-暂停
    playState: {
      type: String,
      default: 'play'
    },
    // 通知的边距
    padding: {
      type: [Number, String],
      default: '9rpx 12rpx'
    }
  },
  data() {
    return {
      textWidth: 0, // 滚动的文字宽度
      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
      animationDuration: '10s', // 动画执行时间
      animationPlayState: 'paused', // 动画的开始和结束执行
      showText: '' // 显示的文本
    }
  },
  watch: {
    list: {
      immediate: true,
      handler(val) {
        this.showText = val.join(',')
        this.$nextTick(() => {
          this.initSize()
        })
      }
    },
    playState(val) {
      if (val == 'play') this.animationPlayState = 'running'
      else this.animationPlayState = 'paused'
    },
    speed(val) {
      this.initSize()
    }
  },
  computed: {
    // 计算字体颜色,如果没有自定义的,就用uview主题颜色
    computeColor() {
      if (this.color) return this.color
      // 如果是无主题,就默认使用content-color
      else if (this.type == 'none') return '#606266'
      else return this.type
    },
    // 文字内容的样式
    textStyle() {
      let style = {}
      if (this.color) style.color = this.color
      else if (this.type == 'none') style.color = '#606266'
      style.fontSize = this.fontSize + 'rpx'
      return style
    },
    // 计算背景颜色
    computeBgColor() {
      if (this.bgColor) return this.bgColor
      else if (this.type == 'none') return 'transparent'
    }
  },
  mounted() {
    this.$nextTick(() => {
      this.initSize()
    })
  },
  methods: {
    initSize() {
      let query = [],
        boxWidth = 0,
        textWidth = 0
      let textQuery = new Promise((resolve, reject) => {
        uni
          .createSelectorQuery()
          .in(this)
          .select(`#u-notice-content`)
          .boundingClientRect()
          .exec(ret => {
            this.textWidth = ret[0].width
            resolve()
          })
      })
      query.push(textQuery)
      Promise.all(query).then(() => {
        // 根据t=s/v(时间=路程/速度),这里为何不需要加上#u-notice-box的宽度,因为中设置了.u-notice-content样式中设置了padding-left: 100%
        // 恰巧计算出来的结果中已经包含了#u-notice-box的宽度
        this.animationDuration = `${this.textWidth / uni.upx2px(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(HX版本2.4.6,IOS13)
        this.animationPlayState = 'paused'
        setTimeout(() => {
          if (this.playState == 'play' && this.autoplay)
            this.animationPlayState = 'running'
        }, 10)
      })
    },
    // 点击通告栏
    click(index) {
      this.$emit('click')
    },
    // 点击关闭按钮
    close() {
      this.$emit('close')
    },
    // 点击更多箭头按钮
    getMore() {
      this.$emit('getMore')
    }
  }
}
</script>

<style lang="scss" scoped>
@import '../../libs/css/style.components.scss';

.u-notice-bar {
  padding: 9rpx 12rpx;
  overflow: hidden;
}

.u-direction-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.u-left-icon {
  display: inline-flex;
  align-items: center;
}

.u-notice-box {
  flex: 1;
  display: flex;
  overflow: hidden;
  margin-left: 6rpx;
}

.u-right-icon {
  margin-left: 6rpx;
  display: inline-flex;
  align-items: center;
}

.u-notice-content {
  animation: u-loop-animation 10s linear infinite both;
  text-align: right;
  // 这一句很重要,为了能让滚动左右连接起来
  padding-left: 100%;
  display: flex;
  flex-wrap: nowrap;
}

.u-notice-text {
  font-size: 13rpx;
  word-break: keep-all;
  white-space: nowrap;
}

@keyframes u-loop-animation {
  0% {
    transform: translate3d(0, 0, 0);
  }

  100% {
    transform: translate3d(-100%, 0, 0);
  }
}
</style>