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