w1020/18.uniapp小程序/project1/wxcomponents/vant/picker/index.js

import { VantComponent } from '../common/component';
import { pickerProps } from './shared';
VantComponent({
    classes: ['active-class', 'toolbar-class', 'column-class'],
    props: Object.assign(Object.assign({}, pickerProps), { valueKey: {
            type: String,
            value: 'text',
        }, toolbarPosition: {
            type: String,
            value: 'top',
        }, defaultIndex: {
            type: Number,
            value: 0,
        }, columns: {
            type: Array,
            value: [],
            observer(columns = []) {
                this.simple = columns.length && !columns[0].values;
                if (Array.isArray(this.children) && this.children.length) {
                    this.setColumns().catch(() => { });
                }
            },
        } }),
    beforeCreate() {
        Object.defineProperty(this, 'children', {
            get: () => this.selectAllComponents('.van-picker__column') || [],
        });
    },
    methods: {
        noop() { },
        setColumns() {
            const { data } = this;
            const columns = this.simple ? [{ values: data.columns }] : data.columns;
            const stack = columns.map((column, index) => this.setColumnValues(index, column.values));
            return Promise.all(stack);
        },
        emit(event) {
            const { type } = event.currentTarget.dataset;
            if (this.simple) {
                this.$emit(type, {
                    value: this.getColumnValue(0),
                    index: this.getColumnIndex(0),
                });
            }
            else {
                this.$emit(type, {
                    value: this.getValues(),
                    index: this.getIndexes(),
                });
            }
        },
        onChange(event) {
            if (this.simple) {
                this.$emit('change', {
                    picker: this,
                    value: this.getColumnValue(0),
                    index: this.getColumnIndex(0),
                });
            }
            else {
                this.$emit('change', {
                    picker: this,
                    value: this.getValues(),
                    index: event.currentTarget.dataset.index,
                });
            }
        },
        // get column instance by index
        getColumn(index) {
            return this.children[index];
        },
        // get column value by index
        getColumnValue(index) {
            const column = this.getColumn(index);
            return column && column.getValue();
        },
        // set column value by index
        setColumnValue(index, value) {
            const column = this.getColumn(index);
            if (column == null) {
                return Promise.reject(new Error('setColumnValue: 对应列不存在'));
            }
            return column.setValue(value);
        },
        // get column option index by column index
        getColumnIndex(columnIndex) {
            return (this.getColumn(columnIndex) || {}).data.currentIndex;
        },
        // set column option index by column index
        setColumnIndex(columnIndex, optionIndex) {
            const column = this.getColumn(columnIndex);
            if (column == null) {
                return Promise.reject(new Error('setColumnIndex: 对应列不存在'));
            }
            return column.setIndex(optionIndex);
        },
        // get options of column by index
        getColumnValues(index) {
            return (this.children[index] || {}).data.options;
        },
        // set options of column by index
        setColumnValues(index, options, needReset = true) {
            const column = this.children[index];
            if (column == null) {
                return Promise.reject(new Error('setColumnValues: 对应列不存在'));
            }
            const isSame = JSON.stringify(column.data.options) === JSON.stringify(options);
            if (isSame) {
                return Promise.resolve();
            }
            return column.set({ options }).then(() => {
                if (needReset) {
                    column.setIndex(0);
                }
            });
        },
        // get values of all columns
        getValues() {
            return this.children.map((child) => child.getValue());
        },
        // set values of all columns
        setValues(values) {
            const stack = values.map((value, index) => this.setColumnValue(index, value));
            return Promise.all(stack);
        },
        // get indexes of all columns
        getIndexes() {
            return this.children.map((child) => child.data.currentIndex);
        },
        // set indexes of all columns
        setIndexes(indexes) {
            const stack = indexes.map((optionIndex, columnIndex) => this.setColumnIndex(columnIndex, optionIndex));
            return Promise.all(stack);
        },
    },
});