<template>
  <view>
    <page-head :title="title"></page-head>
    <view class="uni-title uni-common-pl">普通选择器</view>
    <view class="uni-list">
      <view class="uni-list-cell">
        <view class="uni-list-cell-left"> 当前选择 </view>
        <view class="uni-list-cell-db">
          <picker
            @change="bindPickerChange"
            :value="index"
            :range="array"
            range-key="name"
          >
            <view class="uni-input">{{ array[index].name }}</view>
          </picker>
        </view>
      </view>
    </view>

    <!-- #ifndef MP-ALIPAY -->
    <view class="uni-title uni-common-pl">多列选择器</view>
    <view class="uni-list">
      <view class="uni-list-cell">
        <view class="uni-list-cell-left"> 当前选择 </view>
        <view class="uni-list-cell-db">
          <picker
            mode="multiSelector"
            @columnchange="bindMultiPickerColumnChange"
            :value="multiIndex"
            :range="multiArray"
          >
            <view class="uni-input"
              >{{ multiArray[0][multiIndex[0]] }}，{{
                multiArray[1][multiIndex[1]]
              }}，{{ multiArray[2][multiIndex[2]] }}</view
            >
          </picker>
        </view>
      </view>
    </view>
    <!-- #endif -->

    <view class="uni-title uni-common-pl">时间选择器</view>
    <view class="uni-list">
      <view class="uni-list-cell">
        <view class="uni-list-cell-left"> 当前选择 </view>
        <view class="uni-list-cell-db">
          <picker
            mode="time"
            :value="time"
            start="09:01"
            end="21:01"
            @change="bindTimeChange"
          >
            <view class="uni-input">{{ time }}</view>
          </picker>
        </view>
      </view>
    </view>
    <view class="uni-picker-tips">
      注：选择 09:01 ~ 21:01 之间的时间, 不在区间内不能选中
    </view>

    <view class="uni-title uni-common-pl">日期选择器</view>
    <view class="uni-list">
      <view class="uni-list-cell">
        <view class="uni-list-cell-left"> 当前选择 </view>
        <view class="uni-list-cell-db">
          <picker
            mode="date"
            :value="date"
            :start="startDate"
            :end="endDate"
            @change="bindDateChange"
          >
            <view class="uni-input">{{ date }}</view>
          </picker>
        </view>
      </view>
    </view>
    <view class="uni-picker-tips">
      注：选择当前时间 ±10 年之间的时间, 不在区间内不能选中
    </view>
  </view>
</template>
<script>
function getDate(type) {
  const date = new Date();

  let year = date.getFullYear();
  let month = date.getMonth() + 1;
  let day = date.getDate();

  if (type === "start") {
    year = year - 10;
  } else if (type === "end") {
    year = year + 10;
  }
  month = month > 9 ? month : "0" + month;
  day = day > 9 ? day : "0" + day;

  return `${year}-${month}-${day}`;
}
export default {
  data() {
    return {
      title: "picker",
      array: [
        { name: "中国" },
        { name: "美国" },
        { name: "巴西" },
        { name: "日本" },
      ],
      index: 0,
      multiArray: [
        ["亚洲", "欧洲"],
        ["中国", "日本"],
        ["北京", "上海", "广州"],
      ],
      multiIndex: [0, 0, 0],
      date: getDate({
        format: true,
      }),
      startDate: getDate("start"),
      endDate: getDate("end"),
      time: "12:01",
    };
  },
  methods: {
    bindPickerChange: function (e) {
      console.log("picker发送选择改变，携带值为：" + e.detail.value);
      this.index = e.detail.value;
    },
    bindMultiPickerColumnChange: function (e) {
      console.log(
        "修改的列为：" + e.detail.column + "，值为：" + e.detail.value,
      );
      this.multiIndex[e.detail.column] = e.detail.value;
      switch (e.detail.column) {
        case 0: //拖动第1列
          switch (this.multiIndex[0]) {
            case 0:
              this.multiArray[1] = ["中国", "日本"];
              this.multiArray[2] = ["北京", "上海", "广州"];
              break;
            case 1:
              this.multiArray[1] = ["英国", "法国"];
              this.multiArray[2] = ["伦敦", "曼彻斯特"];
              break;
          }
          this.multiIndex.splice(1, 1, 0);
          this.multiIndex.splice(2, 1, 0);
          break;
        case 1: //拖动第2列
          switch (
            this.multiIndex[0] //判断第一列是什么
          ) {
            case 0:
              switch (this.multiIndex[1]) {
                case 0:
                  this.multiArray[2] = ["北京", "上海", "广州"];
                  break;
                case 1:
                  this.multiArray[2] = ["东京", "北海道"];
                  break;
              }
              break;
            case 1:
              switch (this.multiIndex[1]) {
                case 0:
                  this.multiArray[2] = ["伦敦", "曼彻斯特"];
                  break;
                case 1:
                  this.multiArray[2] = ["巴黎", "马赛"];
                  break;
              }
              break;
          }
          this.multiIndex.splice(2, 1, 0);
          break;
      }
      this.$forceUpdate();
    },
    bindDateChange: function (e) {
      this.date = e.detail.value;
    },
    bindTimeChange: function (e) {
      this.time = e.detail.value;
    },
  },
};
</script>

<style>
.uni-picker-tips {
  font-size: 12px;
  color: #666;
  margin-bottom: 15px;
  padding: 0 15px;
  /* text-align: right; */
}
</style>
