miniprogram/node_modules/@vant/weapp/dist/picker-column/index.js

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import { VantComponent } from '../common/component';
import { range } from '../common/utils';
import { isObj } from '../common/validator';
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;