2022-04-06 16:08:26 +08:00
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<template>
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<u-popup
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:show="show"
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@close="closeHandler"
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>
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<view class="u-picker">
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<u-toolbar
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v-if="showToolbar"
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:cancelColor="cancelColor"
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:confirmColor="confirmColor"
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:cancelText="cancelText"
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:confirmText="confirmText"
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:title="title"
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@cancel="cancel"
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@confirm="confirm"
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></u-toolbar>
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<picker-view
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class="u-picker__view"
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:indicatorStyle="`height: ${$u.addUnit(itemHeight)}`"
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:value="innerIndex"
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:immediateChange="immediateChange"
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:style="{
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height: `${$u.addUnit(visibleItemCount * itemHeight)}`
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}"
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@change="changeHandler"
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>
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<picker-view-column
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v-for="(item, index) in innerColumns"
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:key="index"
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class="u-picker__view__column"
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>
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<text
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v-if="$u.test.array(item)"
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class="u-picker__view__column__item u-line-1"
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v-for="(item1, index1) in item"
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:key="index1"
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:style="{
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height: $u.addUnit(itemHeight),
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lineHeight: $u.addUnit(itemHeight),
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fontWeight: index1 === innerIndex[index] ? 'bold' : 'normal'
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}"
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>{{ getItemText(item1) }}</text>
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</picker-view-column>
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</picker-view>
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<view
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v-if="loading"
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class="u-picker--loading"
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>
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<u-loading-icon mode="circle"></u-loading-icon>
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</view>
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</view>
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</u-popup>
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</template>
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<script>
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/**
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* u-picker
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* @description 选择器
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* @property {Boolean} show 是否显示picker弹窗（默认 false ）
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* @property {Boolean} showToolbar 是否显示顶部的操作栏（默认 true ）
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* @property {String} title 顶部标题
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* @property {Array} columns 对象数组，设置每一列的数据
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* @property {Boolean} loading 是否显示加载中状态（默认 false ）
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* @property {String | Number} itemHeight 各列中，单个选项的高度（默认 44 ）
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* @property {String} cancelText 取消按钮的文字（默认 '取消' ）
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* @property {String} confirmText 确认按钮的文字（默认 '确定' ）
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* @property {String} cancelColor 取消按钮的颜色（默认 '#909193' ）
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* @property {String} confirmColor 确认按钮的颜色（默认 '#3c9cff' ）
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* @property {String | Number} visibleItemCount 每列中可见选项的数量（默认 5 ）
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* @property {String} keyName 选项对象中，需要展示的属性键名（默认 'text' ）
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* @property {Boolean} closeOnClickOverlay 是否允许点击遮罩关闭选择器（默认 false ）
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* @property {Array} defaultIndex 各列的默认索引
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* @property {Boolean} immediateChange 是否在手指松开时立即触发change事件（默认 false ）
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* @event {Function} close 关闭选择器时触发
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* @event {Function} cancel 点击取消按钮触发
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* @event {Function} change 当选择值变化时触发
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* @event {Function} confirm 点击确定按钮，返回当前选择的值
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*/
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import props from './props.js';
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export default {
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name: 'u-picker',
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mixins: [uni.$u.mpMixin, uni.$u.mixin, props],
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data() {
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return {
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// 上一次选择的列索引
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lastIndex: [],
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// 索引值 ，对应picker-view的value
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innerIndex: [],
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// 各列的值
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innerColumns: [],
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// 上一次的变化列索引
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columnIndex: 0,
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}
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},
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watch: {
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// 监听默认索引的变化，重新设置对应的值
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defaultIndex: {
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immediate: true,
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handler(n) {
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this.setIndexs(n, true)
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}
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},
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// 监听columns参数的变化
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columns: {
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immediate: true,
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handler(n) {
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this.setColumns(n)
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}
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},
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},
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methods: {
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// 获取item需要显示的文字，判别为对象还是文本
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getItemText(item) {
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if (uni.$u.test.object(item)) {
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return item[this.keyName]
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} else {
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return item
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}
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},
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// 关闭选择器
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closeHandler() {
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if (this.closeOnClickOverlay) {
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this.$emit('close')
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}
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},
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// 点击工具栏的取消按钮
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cancel() {
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this.$emit('cancel')
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},
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// 点击工具栏的确定按钮
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confirm() {
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this.$emit('confirm', {
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indexs: this.innerIndex,
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value: this.innerColumns.map((item, index) => item[this.innerIndex[index]]),
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values: this.innerColumns
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})
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},
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// 选择器某一列的数据发生变化时触发
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changeHandler(e) {
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const {
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value
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} = e.detail
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let index = 0,
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columnIndex = 0
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// 通过对比前后两次的列索引，得出当前变化的是哪一列
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for (let i = 0; i < value.length; i++) {
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let item = value[i]
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if (item !== (this.lastIndex[i] || 0)) { // 把undefined转为合法假值0
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// 设置columnIndex为当前变化列的索引
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columnIndex = i
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// index则为变化列中的变化项的索引
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index = item
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break // 终止循环，即使少一次循环，也是性能的提升
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}
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}
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this.columnIndex = columnIndex
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const values = this.innerColumns
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// 将当前的各项变化索引，设置为"上一次"的索引变化值
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this.setLastIndex(value)
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this.setIndexs(value)
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this.$emit('change', {
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2022-11-19 20:38:24 +08:00
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// #ifndef MP-WEIXIN || MP-LARK
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2022-04-06 16:08:26 +08:00
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// 微信小程序不能传递this，会因为循环引用而报错
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picker: this,
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// #endif
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value: this.innerColumns.map((item, index) => item[value[index]]),
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index,
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indexs: value,
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// values为当前变化列的数组内容
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values,
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columnIndex
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})
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},
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// 设置index索引，此方法可被外部调用设置
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setIndexs(index, setLastIndex) {
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this.innerIndex = uni.$u.deepClone(index)
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if (setLastIndex) {
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this.setLastIndex(index)
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}
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},
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// 记录上一次的各列索引位置
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setLastIndex(index) {
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// 当能进入此方法，意味着当前设置的各列默认索引，即为“上一次”的选中值，需要记录，是因为changeHandler中
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// 需要拿前后的变化值进行对比，得出当前发生改变的是哪一列
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this.lastIndex = uni.$u.deepClone(index)
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},
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// 设置对应列选项的所有值
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setColumnValues(columnIndex, values) {
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// 替换innerColumns数组中columnIndex索引的值为values，使用的是数组的splice方法
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this.innerColumns.splice(columnIndex, 1, values)
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// 拷贝一份原有的innerIndex做临时变量，将大于当前变化列的所有的列的默认索引设置为0
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let tmpIndex = uni.$u.deepClone(this.innerIndex)
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for (let i = 0; i < this.innerColumns.length; i++) {
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if (i > this.columnIndex) {
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tmpIndex[i] = 0
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}
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}
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// 一次性赋值，不能单个修改，否则无效
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this.setIndexs(tmpIndex)
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},
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// 获取对应列的所有选项
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getColumnValues(columnIndex) {
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// 进行同步阻塞，因为外部得到change事件之后，可能需要执行setColumnValues更新列的值
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// 索引如果在外部change的回调中调用getColumnValues的话，可能无法得到变更后的列值，这里进行一定延时，保证值的准确性
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(async () => {
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await uni.$u.sleep()
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})()
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return this.innerColumns[columnIndex]
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},
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// 设置整体各列的columns的值
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setColumns(columns) {
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this.innerColumns = uni.$u.deepClone(columns)
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// 如果在设置各列数据时，没有被设置默认的各列索引defaultIndex，那么用0去填充它，数组长度为列的数量
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if (this.innerIndex.length === 0) {
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this.innerIndex = new Array(columns.length).fill(0)
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}
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},
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// 获取各列选中值对应的索引
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getIndexs() {
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return this.innerIndex
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},
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// 获取各列选中的值
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getValues() {
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// 进行同步阻塞，因为外部得到change事件之后，可能需要执行setColumnValues更新列的值
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// 索引如果在外部change的回调中调用getValues的话，可能无法得到变更后的列值，这里进行一定延时，保证值的准确性
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(async () => {
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await uni.$u.sleep()
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})()
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return this.innerColumns.map((item, index) => item[this.innerIndex[index]])
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}
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},
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}
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</script>
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<style lang="scss" scoped>
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@import "../../libs/css/components.scss";
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.u-picker {
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position: relative;
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&__view {
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&__column {
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@include flex;
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flex: 1;
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justify-content: center;
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&__item {
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@include flex;
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justify-content: center;
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align-items: center;
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font-size: 16px;
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text-align: center;
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/* #ifndef APP-NVUE */
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display: block;
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/* #endif */
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color: $u-main-color;
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&--disabled {
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/* #ifndef APP-NVUE */
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cursor: not-allowed;
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/* #endif */
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opacity: 0.35;
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}
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}
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}
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}
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&--loading {
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position: absolute;
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top: 0;
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right: 0;
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left: 0;
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bottom: 0;
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@include flex;
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justify-content: center;
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align-items: center;
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background-color: rgba(255, 255, 255, 0.87);
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z-index: 1000;
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}
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}
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</style>
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