<template>
  <div
    style="
      display: inline-flex;
      justify-content: flex-start;
      align-items: center;
    "
  >
    <div
      v-for="(item, index) in numberList"
      :key="index"
      style="
        display: inline-flex;
        justify-content: flex-start;
        align-items: center;
        padding-bottom: 0.3rem;
        box-sizing: border-box;
      "
    >
      <span v-if="isNaN(item)">{{ item }}</span>
      <div class="number" v-else :style="{ color: TextColor }">
        <span
          class="number-item"
          ref="numberItem"
          :data-number="item"
          :data-index="index"
          >0123456789</span
        >
      </div>
    </div>
  </div>
</template>
<script>
export default {
  name: "ScrollNumber",
  props: {
    value: {
      type: [String, Number],
      default: 0,
    },
    TextColor: {
      type: String,
      default: "black",
    },
  },
  watch: {
    value: {
      handler(newValue, oldValue) {
        // console.log("?? ~ value ~ newVal:", newValue);
        if (newValue) {
          this.$nextTick(() => {
            this.setNumberTransform();
          });
        }
      },
      deep: true,
      immediate: true,
    },
    TextColor: {
      handler(newValue, oldValue) {
        console.log("?? ~ handler ~ newValue:", newValue);
        this.TextColor = newValue;
      },
      deep: true,
      immediate: true,
    },
  },
  computed: {
    numberList() {
      return String(this.value).split("");
    },
    pageColor() {
      return {
        "--TextColor": this.TextColor,
      };
    },
  },
  data() {
    return {
      hasShow: false, // 是否已展示過(guò)動(dòng)畫
      // TextColor: "red",
    };
  },
  mounted() {
    window.addEventListener("scroll", this.scrollHandle, true); // 監(jiān)聽(tīng) 監(jiān)聽(tīng)元素是否進(jìn)入/移出可視區(qū)域
  },

  methods: {
    scrollHandle() {
      const offset = this.$el.getBoundingClientRect();
      const offsetTop = offset.top;
      const offsetBottom = offset.bottom;
      // 進(jìn)入可視區(qū)域
      if (offsetTop <= window.innerHeight && offsetBottom >= 0) {
        this.setNumberTransform();
        this.hasShow = true;
        window.removeEventListener("scroll", this.scrollHandle, true);
      } else {
        // 移出可視區(qū)域
        if (this.hasShow) {
          window.removeEventListener("scroll", this.scrollHandle, true);
        }
      }
    },
    // 設(shè)置每一位數(shù)字的偏移
    setNumberTransform() {
      let numberItems = this.$refs.numberItem;
      let obj = {};
      Array.from(numberItems).forEach((c) => {
        let key = c.dataset.index;
        let value = c.dataset.number;
        let init = 0;
        obj[key] = setInterval(() => {
          if (init < value * 10) {
            init += 1;
            c.style.transform = `translateY(-${init}%)`;
          } else {
            clearInterval(obj[key]);
            obj[key] = null;
          }
        }, 8);
      });
    },
  },
};
</script>
<style scoped lang="scss">
.number {
  width: 30px;
  height: 30px;
  font-size: 25px;
  font-weight: 800;
  color: var(--TextColor);
  text-align: center;
  overflow: hidden;
  span {
    text-align: center;
    writing-mode: vertical-rl;
    text-orientation: upright;
    transform: translateY(0%);
  }
}
</style>

<template>
  <div class="father">
    <FlipItemVue :value="num.toString()" :TextColor="TextColor"></FlipItemVue>
    <button @click="NumChangeFn">點(diǎn)擊變更數(shù)字</button>
  </div>
</template>
<script>
import FlipItemVue from "./FlipItem.vue";
export default {
  components: {
    FlipItemVue,
  },
  data() {
    return {
      num: 123456,
      TextColor: "red",
    };
  },
  methods: {
    NumChangeFn() {
      this.num = 9999999;
    },
  },
};
</script>
<style lang="scss" scoped>
</style>

<template>
  <div class="days-box">
    <div class="operating-title">安全運(yùn)行天數(shù)</div>
    <div class="box-item">
      <li
        :class="{
          'number-item': !isNaN(item),
          'mark-item': isNaN(item),
        }"
        v-for="(item, index) in runningDays"
        :key="index"
      >
        <span v-if="!isNaN(item)">
          <i ref="numberItem">0123456789</i>
        </span>
        <span class="comma" v-else>{{ item }}</span>
      </li>
    </div>
    <button @click="toRunningNum(399)">點(diǎn)擊</button>
  </div>
</template>
<script>
export default {
  data() {
    return {
      runningDays: ["0", "0", "0", "0", "0", "0", "0", "0"],
    };
  },
  mounted() {
    // 獲取當(dāng)前日期
    var today = new Date();
    // 設(shè)置起始日期
    var startDate = new Date("2023-04-24");
    // 計(jì)算天數(shù)差
    var timeDiff = Math.abs(today.getTime() - startDate.getTime());
    var diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24));
    this.$nextTick(() => {
      this.toRunningNum(diffDays); // 這里輸入數(shù)字即可調(diào)用
      this.setNumberTransform();
    });
  },
  methods: {
    // 設(shè)置文字滾動(dòng)
    setNumberTransform() {
      const numberItems = this.$refs.numberItem; // 拿到數(shù)字的ref，計(jì)算元素?cái)?shù)量
      console.log("?? ~ setNumberTransform ~ numberItems:", numberItems);
      const numberArr = this.runningDays.filter((item) => !isNaN(item));
      // 結(jié)合CSS 對(duì)數(shù)字字符進(jìn)行滾動(dòng),顯示訂單數(shù)量
      for (let index = 0; index < numberItems.length; index++) {
        const elem = numberItems[index];
        elem.style.transform = `translate(-50%, -${numberArr[index] * 10}%)`;
      }
    },
    // 處理數(shù)字
    toRunningNum(num) {
      num = num.toString();
      this.runningDays = num.split(""); // 將其便變成數(shù)據(jù)，渲染至滾動(dòng)數(shù)組
      this.setNumberTransform();
    },
  },
};
</script>
<style lang="scss" scoped>
.days-box {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

/*滾動(dòng)數(shù)字設(shè)置*/
.operating-title {
  color: black;
  font-size: 16px;
  margin-bottom: 10px;
}
.box-item {
  position: relative;
  height: 80px;
  font-size: 54px;
  line-height: 41px;
  text-align: center;
  list-style: none;
  // color: #2d7cff;
  color: #fff;
  writing-mode: vertical-lr;
  text-orientation: upright;
  /*文字禁止編輯*/
  -moz-user-select: none; /*火狐*/
  -webkit-user-select: none; /*webkit瀏覽器*/
  -ms-user-select: none; /*IE10*/
  -khtml-user-select: none; /*早期瀏覽器*/
  user-select: none;
  /* overflow: hidden; */
}

/* 默認(rèn)逗號(hào)設(shè)置 */
.mark-item {
  width: 10px;
  height: 100px;
  margin-right: 5px;
  line-height: 10px;
  font-size: 48px;
  position: relative;
  & > span {
    position: absolute;
    width: 100%;
    bottom: 0;
    writing-mode: vertical-rl;
    text-orientation: upright;
  }
}

/*滾動(dòng)數(shù)字設(shè)置*/
.number-item {
  width: 41px;
  height: 75px;
  // background: #ccc;
  list-style: none;
  margin-right: 5px;
  // background: rgb(7, 50, 207);
  border-radius: 4px;
  // border: 1px solid rgba(7, 50, 207, 1);
  color: black;
  & > span {
    position: relative;
    display: inline-block;
    margin-right: 10px;
    width: 100%;
    height: 100%;
    writing-mode: vertical-rl;
    text-orientation: upright;
    overflow: hidden;
    & > i {
      font-style: normal;
      position: absolute;
      top: 11px;
      left: 50%;
      transform: translate(-50%, 0);
      transition: transform 1s ease-in-out;
      letter-spacing: 10px;
    }
  }
}
</style>