wwbsr/wxcomponents/vant/picker-column/index.vue

<template>
<uni-shadow-root class="vant-picker-column-index"><view class="van-picker-column custom-class" :style="'height: '+(itemHeight * visibleItemCount)+'px'" @touchstart="onTouchStart" @touchmove.stop.prevent="onTouchMove" @touchend="onTouchEnd" @touchcancel="onTouchEnd">
  <view :style="'transition: transform '+(duration)+'ms; line-height: '+(itemHeight)+'px; transform: translate3d(0, '+(offset + (itemHeight * (visibleItemCount - 1)) / 2)+'px, 0)'">
    <view v-for="(option,index) in (options)" :key="option.index" :data-index="index" :style="'height: '+(itemHeight)+'px'" :class="'van-ellipsis van-picker-column__item '+(option && option.disabled ? 'van-picker-column__item--disabled' : '')+' '+(index === currentIndex ? 'van-picker-column__item--selected active-class' : '')" @click="onClickItem">{{ getOptionText(option, valueKey) }}</view>
  </view>
</view></uni-shadow-root>
</template>
<wxs src="./index.wxs" module="getOptionText"></wxs>
<script>

global['__wxRoute'] = 'vant/picker-column/index'
import { VantComponent } from '../common/component';
import { isObj, range } from '../common/utils';
const DEFAULT_DURATION = 200;
VantComponent({
  classes: ['active-class'],
  props: {
    valueKey: String,
    className: String,
    itemHeight: Number,
    visibleItemCount: Number,
    initialOptions: {
      type: Array,
      value: [],
    },
    defaultIndex: {
      type: Number,
      value: 0,
      observer(value) {
        this.setIndex(value);
      },
    },
  },
  data: {
    startY: 0,
    offset: 0,
    duration: 0,
    startOffset: 0,
    options: [],
    currentIndex: 0,
  },
  created() {
    const { defaultIndex, initialOptions } = this.data;
    this.set({
      currentIndex: defaultIndex,
      options: initialOptions,
    }).then(() => {
      this.setIndex(defaultIndex);
    });
  },
  methods: {
    getCount() {
      return this.data.options.length;
    },
    onTouchStart(event) {
      this.setData({
        startY: event.touches[0].clientY,
        startOffset: this.data.offset,
        duration: 0,
      });
    },
    onTouchMove(event) {
      const { data } = this;
      const deltaY = event.touches[0].clientY - data.startY;
      this.setData({
        offset: range(
          data.startOffset + deltaY,
          -(this.getCount() * data.itemHeight),
          data.itemHeight
        ),
      });
    },
    onTouchEnd() {
      const { data } = this;
      if (data.offset !== data.startOffset) {
        this.setData({ duration: DEFAULT_DURATION });
        const index = range(
          Math.round(-data.offset / data.itemHeight),
          0,
          this.getCount() - 1
        );
        this.setIndex(index, true);
      }
    },
    onClickItem(event) {
      const { index } = event.currentTarget.dataset;
      this.setIndex(index, true);
    },
    adjustIndex(index) {
      const { data } = this;
      const count = this.getCount();
      index = range(index, 0, count);
      for (let i = index; i < count; i++) {
        if (!this.isDisabled(data.options[i])) return i;
      }
      for (let i = index - 1; i >= 0; i--) {
        if (!this.isDisabled(data.options[i])) return i;
      }
    },
    isDisabled(option) {
      return isObj(option) && option.disabled;
    },
    getOptionText(option) {
      const { data } = this;
      return isObj(option) && data.valueKey in option
        ? option[data.valueKey]
        : option;
    },
    setIndex(index, userAction) {
      const { data } = this;
      index = this.adjustIndex(index) || 0;
      const offset = -index * data.itemHeight;
      if (index !== data.currentIndex) {
        return this.set({ offset, currentIndex: index }).then(() => {
          userAction && this.$emit('change', index);
        });
      }
      return this.set({ offset });
    },
    setValue(value) {
      const { options } = this.data;
      for (let i = 0; i < options.length; i++) {
        if (this.getOptionText(options[i]) === value) {
          return this.setIndex(i);
        }
      }
      return Promise.resolve();
    },
    getValue() {
      const { data } = this;
      return data.options[data.currentIndex];
    },
  },
});
export default global['__wxComponents']['vant/picker-column/index']
</script>
<style platform="mp-weixin">
@import '../common/index.css';.van-picker-column{overflow:hidden;text-align:center;color:#000;color:var(--picker-option-text-color,#000);font-size:16px;font-size:var(--picker-option-font-size,16px)}.van-picker-column__item{padding:0 5px}.van-picker-column__item--selected{font-weight:500;font-weight:var(--font-weight-bold,500);color:#323233;color:var(--picker-option-selected-text-color,#323233)}.van-picker-column__item--disabled{opacity:.3;opacity:var(--picker-option-disabled-opacity,.3)}
</style>