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413 lines
12 KiB
413 lines
12 KiB
3 years ago
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<template>
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<view class="u-number-box">
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<view
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class="u-number-box__slot"
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@tap.stop="clickHandler('minus')"
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@touchstart="onTouchStart('minus')"
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@touchend.stop="clearTimeout"
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v-if="showMinus && $slots.minus"
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>
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<slot name="minus" />
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</view>
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<view
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v-else-if="showMinus"
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class="u-number-box__minus"
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@tap.stop="clickHandler('minus')"
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@touchstart="onTouchStart('minus')"
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@touchend.stop="clearTimeout"
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hover-class="u-number-box__minus--hover"
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hover-stay-time="150"
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:class="{ 'u-number-box__minus--disabled': isDisabled('minus') }"
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:style="[buttonStyle('minus')]"
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>
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<u-icon
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name="minus"
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:color="isDisabled('minus') ? '#c8c9cc' : '#323233'"
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size="15"
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bold
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:customStyle="iconStyle"
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></u-icon>
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</view>
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<slot name="input">
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<input
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:disabled="disabledInput || disabled"
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:cursor-spacing="getCursorSpacing"
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:class="{ 'u-number-box__input--disabled': disabled || disabledInput }"
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v-model="currentValue"
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class="u-number-box__input"
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@blur="onBlur"
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@focus="onFocus"
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@input="onInput"
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type="number"
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:style="[inputStyle]"
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/>
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</slot>
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<view
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class="u-number-box__slot"
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@tap.stop="clickHandler('plus')"
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@touchstart="onTouchStart('plus')"
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@touchend.stop="clearTimeout"
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v-if="showPlus && $slots.plus"
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>
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<slot name="plus" />
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</view>
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<view
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v-else-if="showPlus"
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class="u-number-box__plus"
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@tap.stop="clickHandler('plus')"
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@touchstart="onTouchStart('plus')"
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@touchend.stop="clearTimeout"
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hover-class="u-number-box__plus--hover"
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hover-stay-time="150"
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:class="{ 'u-number-box__minus--disabled': isDisabled('plus') }"
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:style="[buttonStyle('plus')]"
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>
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<u-icon
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name="plus"
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:color="isDisabled('plus') ? '#c8c9cc' : '#323233'"
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size="15"
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bold
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:customStyle="iconStyle"
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></u-icon>
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</view>
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</view>
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</template>
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<script>
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import props from './props.js';
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/**
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* numberBox 步进器
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* @description 该组件一般用于商城购物选择物品数量的场景。
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* @tutorial https://uviewui.com/components/numberBox.html
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* @property {String | Number} name 步进器标识符，在change回调返回
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* @property {String | Number} value 用于双向绑定的值，初始化时设置设为默认min值(最小值) （默认 0 ）
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* @property {String | Number} min 最小值 （默认 1 ）
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* @property {String | Number} max 最大值 （默认 Number.MAX_SAFE_INTEGER ）
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* @property {String | Number} step 加减的步长，可为小数 （默认 1 ）
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* @property {Boolean} integer 是否只允许输入整数 （默认 false ）
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* @property {Boolean} disabled 是否禁用，包括输入框，加减按钮 （默认 false ）
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* @property {Boolean} disabledInput 是否禁用输入框 （默认 false ）
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* @property {Boolean} asyncChange 是否开启异步变更，开启后需要手动控制输入值 （默认 false ）
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* @property {String | Number} inputWidth 输入框宽度，单位为px （默认 35 ）
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* @property {Boolean} showMinus 是否显示减少按钮 （默认 true ）
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* @property {Boolean} showPlus 是否显示增加按钮 （默认 true ）
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* @property {String | Number} decimalLength 显示的小数位数
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* @property {Boolean} longPress 是否开启长按加减手势 （默认 true ）
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* @property {String} color 输入框文字和加减按钮图标的颜色 （默认 '#323233' ）
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* @property {String | Number} buttonSize 按钮大小，宽高等于此值，单位px，输入框高度和此值保持一致 （默认 30 ）
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* @property {String} bgColor 输入框和按钮的背景颜色 （默认 '#EBECEE' ）
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* @property {String | Number} cursorSpacing 指定光标于键盘的距离，避免键盘遮挡输入框，单位px （默认 100 ）
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* @property {Boolean} disablePlus 是否禁用增加按钮 （默认 false ）
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* @property {Boolean} disableMinus 是否禁用减少按钮 （默认 false ）
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* @property {Object ｜ String} iconStyle 加减按钮图标的样式
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*
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* @event {Function} onFocus 输入框活动焦点
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* @event {Function} onBlur 输入框失去焦点
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* @event {Function} onInput 输入框值发生变化
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* @event {Function} onChange
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* @example <u-number-box v-model="value" @change="valChange"></u-number-box>
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*/
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export default {
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name: 'u-number-box',
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mixins: [uni.$u.mpMixin, uni.$u.mixin, props],
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data() {
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return {
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// 输入框实际操作的值
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currentValue: '',
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// 定时器
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longPressTimer: null
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}
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},
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watch: {
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// 多个值之间，只要一个值发生变化，都要重新检查check()函数
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watchChange(n) {
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this.check()
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},
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// 监听v-mode的变化，重新初始化内部的值
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value(n) {
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if (n !== this.currentValue) {
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this.currentValue = this.format(this.value)
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}
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}
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},
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computed: {
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getCursorSpacing() {
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// 判断传入的单位，如果为px单位，需要转成px
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const number = parseInt(this.cursorSpacing)
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return /rpx$/.test(String(this.cursorSpacing)) ? uni.upx2px(number) : number
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},
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// 按钮的样式
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buttonStyle() {
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return (type) => {
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const style = {
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backgroundColor: this.bgColor,
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height: this.$u.addUnit(this.buttonSize),
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color: this.color
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}
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if (this.isDisabled(type)) {
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style.backgroundColor = '#f7f8fa'
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}
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return style
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}
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},
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// 输入框的样式
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inputStyle() {
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const disabled = this.disabled || this.disabledInput
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const style = {
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color: this.color,
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backgroundColor: this.bgColor,
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height: this.$u.addUnit(this.buttonSize),
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width: this.$u.addUnit(this.inputWidth)
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}
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return style
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},
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// 用于监听多个值发生变化
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watchChange() {
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return [this.integer, this.decimalLength, this.min, this.max]
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},
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isDisabled() {
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return (type) => {
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if (type === 'plus') {
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// 在点击增加按钮情况下，判断整体的disabled，是否单独禁用增加按钮，以及当前值是否大于最大的允许值
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return (
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this.disabled ||
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this.disablePlus ||
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this.currentValue >= this.max
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)
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}
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// 点击减少按钮同理
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return (
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this.disabled ||
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this.disableMinus ||
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this.currentValue <= this.min
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)
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}
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},
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},
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mounted() {
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this.init()
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},
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methods: {
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init() {
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this.currentValue = this.format(this.value)
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},
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// 格式化整理数据，限制范围
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format(value) {
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value = this.filter(value)
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// 如果为空字符串，那么设置为0，同时将值转为Number类型
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value = value === '' ? 0 : +value
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// 对比最大最小值，取在min和max之间的值
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value = Math.max(Math.min(this.max, value), this.min)
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// 如果设定了最大的小数位数，使用toFixed去进行格式化
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if (this.decimalLength !== null) {
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value = value.toFixed(this.decimalLength)
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}
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return value
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},
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// 过滤非法的字符
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filter(value) {
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// 只允许0-9之间的数字，"."为小数点，"-"为负数时候使用
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value = String(value).replace(/[^0-9.-]/g, '')
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// 如果只允许输入整数，则过滤掉小数点后的部分
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if (this.integer && value.indexOf('.') !== -1) {
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value = value.split('.')[0]
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}
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return value;
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},
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check() {
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// 格式化了之后，如果前后的值不相等，那么设置为格式化后的值
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const val = this.format(this.currentValue);
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if (val !== this.currentValue) {
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this.currentValue = val
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}
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},
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// 判断是否出于禁止操作状态
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// isDisabled(type) {
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// if (type === 'plus') {
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// // 在点击增加按钮情况下，判断整体的disabled，是否单独禁用增加按钮，以及当前值是否大于最大的允许值
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// return (
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// this.disabled ||
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// this.disablePlus ||
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// this.currentValue >= this.max
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// )
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// }
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// // 点击减少按钮同理
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// return (
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// this.disabled ||
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// this.disableMinus ||
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// this.currentValue <= this.min
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// )
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// },
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// 输入框活动焦点
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onFocus(event) {
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this.$emit('focus', event.detail)
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},
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// 输入框失去焦点
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onBlur(event) {
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// 对输入值进行格式化
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const value = this.format(event.detail.value)
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this.emitChange(value)
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// 发出blur事件
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this.$emit(
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'blur',
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Object.assign(Object.assign({}, event.detail), {
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value
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})
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)
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},
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// 输入框值发生变化
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onInput(e) {
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const {
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value = ''
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} = e.detail || {}
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// 为空返回
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if (value === '') return
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let formatted = this.filter(value)
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// 最大允许的小数长度
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if (this.decimalLength !== null && formatted.indexOf('.') !== -1) {
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const pair = formatted.split('.');
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formatted = `${pair[0]}.${pair[1].slice(0, this.decimalLength)}`
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}
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formatted = this.format(formatted)
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this.emitChange(formatted);
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},
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// 发出change事件
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emitChange(value) {
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// 如果开启了异步变更值，则不修改内部的值，需要用户手动在外部通过v-model变更
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if (!this.asyncChange) {
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this.$nextTick(() => {
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this.$emit('input', value)
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this.currentValue = value
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this.$forceUpdate()
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})
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}
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this.$emit('change', value);
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},
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onChange() {
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const {
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type
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} = this
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if (this.isDisabled(type)) {
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return this.$emit('overlimit', type)
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}
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const diff = type === 'minus' ? -this.step : +this.step
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const value = this.format(this.add(+this.currentValue, diff))
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this.emitChange(value)
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this.$emit(type)
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},
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// 对值扩大后进行四舍五入，再除以扩大因子，避免出现浮点数操作的精度问题
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add(num1, num2) {
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const cardinal = Math.pow(10, 10);
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return Math.round((num1 + num2) * cardinal) / cardinal
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},
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// 点击加减按钮
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clickHandler(type) {
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this.type = type
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this.onChange()
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},
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longPressStep() {
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// 每隔一段时间，重新调用longPressStep方法，实现长按加减
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this.clearTimeout()
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this.longPressTimer = setTimeout(() => {
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this.onChange()
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this.longPressStep()
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}, 250);
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},
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onTouchStart(type) {
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if (!this.longPress) return
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this.clearTimeout()
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this.type = type
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// 一定时间后，默认达到长按状态
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this.longPressTimer = setTimeout(() => {
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this.onChange()
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this.longPressStep()
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}, 600)
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},
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// 触摸结束，清除定时器，停止长按加减
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onTouchEnd() {
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if (!this.longPress) return
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this.clearTimeout()
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},
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// 清除定时器
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clearTimeout() {
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clearTimeout(this.longPressTimer)
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this.longPressTimer = null
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}
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}
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}
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</script>
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<style lang="scss">
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@import '../../libs/css/components.scss';
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$u-numberBox-hover-bgColor: #E6E6E6 !default;
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$u-numberBox-disabled-color: #c8c9cc !default;
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$u-numberBox-disabled-bgColor: #f7f8fa !default;
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$u-numberBox-plus-radius: 4px !default;
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$u-numberBox-minus-radius: 4px !default;
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$u-numberBox-input-text-align: center !default;
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$u-numberBox-input-font-size: 15px !default;
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$u-numberBox-input-padding: 0 !default;
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$u-numberBox-input-margin: 0 2px !default;
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$u-numberBox-input-disabled-color: #c8c9cc !default;
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$u-numberBox-input-disabled-bgColor: #f2f3f5 !default;
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.u-number-box {
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@include flex(row);
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align-items: center;
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&__slot {
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/* #ifndef APP-NVUE */
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touch-action: none;
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/* #endif */
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}
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&__plus,
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&__minus {
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width: 35px;
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@include flex;
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justify-content: center;
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align-items: center;
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/* #ifndef APP-NVUE */
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touch-action: none;
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/* #endif */
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&--hover {
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background-color: $u-numberBox-hover-bgColor !important;
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}
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&--disabled {
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color: $u-numberBox-disabled-color;
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background-color: $u-numberBox-disabled-bgColor;
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}
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}
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&__plus {
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border-top-right-radius: $u-numberBox-plus-radius;
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border-bottom-right-radius: $u-numberBox-plus-radius;
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}
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&__minus {
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border-top-left-radius: $u-numberBox-minus-radius;
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border-bottom-left-radius: $u-numberBox-minus-radius;
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}
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&__input {
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position: relative;
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text-align: $u-numberBox-input-text-align;
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font-size: $u-numberBox-input-font-size;
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padding: $u-numberBox-input-padding;
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margin: $u-numberBox-input-margin;
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@include flex;
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align-items: center;
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justify-content: center;
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&--disabled {
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color: $u-numberBox-input-disabled-color;
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background-color: $u-numberBox-input-disabled-bgColor;
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}
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}
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}
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</style>
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