<template> 
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    <view class="u-numberbox"> 
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        <view class="u-icon-minus" @touchstart.stop.prevent="btnTouchStart('minus')" @touchend.stop.prevent="clearTimer" :class="{ 'u-icon-disabled': disabled || inputVal <= min }" 
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            :style="{ 
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                background: bgColor, 
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                height: inputHeight + 'rpx', 
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                color: color 
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            }"> 
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            <u-icon name="minus" :size="size"></u-icon> 
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        </view> 
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        <input :disabled="disabledInput || disabled" :cursor-spacing="getCursorSpacing" :class="{ 'u-input-disabled': disabled }" 
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            v-model="inputVal" class="u-number-input" @blur="onBlur" @focus="onFocus" 
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            type="number" :style="{ 
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                color: color, 
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                fontSize: size + 'rpx', 
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                background: bgColor, 
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                height: inputHeight + 'rpx', 
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                width: inputWidth + 'rpx' 
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            }" /> 
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        <view class="u-icon-plus" @touchstart.stop.prevent="btnTouchStart('plus')" @touchend.stop.prevent="clearTimer" :class="{ 'u-icon-disabled': disabled || inputVal >= max }" 
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            :style="{ 
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                background: bgColor, 
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                height: inputHeight + 'rpx', 
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                color: color 
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            }"> 
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            <u-icon name="plus" :size="size"></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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    /** 
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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。注意:该输入框只能输入大于或等于0的整数,不支持小数输入 
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     * @tutorial https://www.uviewui.com/components/numberBox.html 
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     * @property {Number} value 输入框初始值(默认1) 
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     * @property {String} bg-color 输入框和按钮的背景颜色(默认#F2F3F5) 
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     * @property {Number} min 用户可输入的最小值(默认0) 
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     * @property {Number} max 用户可输入的最大值(默认99999) 
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     * @property {Number} step 步长,每次加或减的值(默认1) 
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     * @property {Boolean} disabled 是否禁用操作,禁用后无法加减或手动修改输入框的值(默认false) 
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     * @property {Boolean} disabled-input 是否禁止输入框手动输入值(默认false) 
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     * @property {Boolean} positive-integer 是否只能输入正整数(默认true) 
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     * @property {String | Number} size 输入框文字和按钮字体大小,单位rpx(默认26) 
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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} input-width 输入框宽度,单位rpx(默认80) 
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     * @property {String | Number} input-height 输入框和按钮的高度,单位rpx(默认50) 
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     * @property {String | Number} index 事件回调时用以区分当前发生变化的是哪个输入框 
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     * @property {Boolean} long-press 是否开启长按连续递增或递减(默认true) 
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     * @property {String | Number} press-time 开启长按触发后,每触发一次需要多久,单位ms(默认250) 
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     * @property {String | Number} cursor-spacing 指定光标于键盘的距离,避免键盘遮挡输入框,单位rpx(默认200) 
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     * @event {Function} change 输入框内容发生变化时触发,对象形式 
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     * @event {Function} blur 输入框失去焦点时触发,对象形式 
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     * @event {Function} minus 点击减少按钮时触发(按钮可点击情况下),对象形式 
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     * @event {Function} plus 点击增加按钮时触发(按钮可点击情况下),对象形式 
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     * @example <u-number-box :min="1" :max="100"></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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        props: { 
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            // 预显示的数字 
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            value: { 
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                type: Number, 
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                default: 1 
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            }, 
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            // 背景颜色 
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            bgColor: { 
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                type: String, 
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                default: '#F2F3F5' 
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            }, 
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            // 最小值 
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            min: { 
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                type: Number, 
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                default: 0 
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            }, 
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            // 最大值 
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            max: { 
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                type: Number, 
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                default: 99999 
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            }, 
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            // 步进值,每次加或减的值 
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            step: { 
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                type: Number, 
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                default: 1 
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            }, 
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            // 是否禁用加减操作 
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            disabled: { 
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                type: Boolean, 
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                default: false 
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            }, 
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            // input的字体大小,单位rpx 
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            size: { 
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                type: [Number, String], 
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                default: 26 
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            }, 
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            // 加减图标的颜色 
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            color: { 
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                type: String, 
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                default: '#323233' 
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            }, 
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            // input宽度,单位rpx 
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            inputWidth: { 
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                type: [Number, String], 
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                default: 80 
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            }, 
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            // input高度,单位rpx 
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            inputHeight: { 
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                type: [Number, String], 
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                default: 50 
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            }, 
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            // index索引,用于列表中使用,让用户知道是哪个numberbox发生了变化,一般使用for循环出来的index值即可 
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            index: { 
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                type: [Number, String], 
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                default: '' 
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            }, 
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            // 是否禁用输入框,与disabled作用于输入框时,为OR的关系,即想要禁用输入框,又可以加减的话 
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            // 设置disabled为false,disabledInput为true即可 
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            disabledInput: { 
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                type: Boolean, 
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                default: false 
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            }, 
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            // 输入框于键盘之间的距离 
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            cursorSpacing: { 
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                type: [Number, String], 
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                default: 100 
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            }, 
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            // 是否开启长按连续递增或递减 
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            longPress: { 
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                type: Boolean, 
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                default: true 
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            }, 
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            // 开启长按触发后,每触发一次需要多久 
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            pressTime: { 
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                type: [Number, String], 
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                default: 250 
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            }, 
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            // 是否只能输入大于或等于0的整数(正整数) 
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            positiveInteger: { 
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                type: Boolean, 
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                default: true 
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            } 
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        }, 
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        watch: { 
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            value(v1, v2) { 
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                // 只有value的改变是来自外部的时候,才去同步inputVal的值,否则会造成循环错误 
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                if(!this.changeFromInner) { 
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                    this.inputVal = v1; 
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                    // 因为inputVal变化后,会触发this.handleChange(),在其中changeFromInner会再次被设置为true, 
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                    // 造成外面修改值,也导致被认为是内部修改的混乱,这里进行this.$nextTick延时,保证在运行周期的最后处 
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                    // 将changeFromInner设置为false 
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                    this.$nextTick(function(){ 
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                        this.changeFromInner = false; 
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                    }) 
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                } 
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            }, 
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            inputVal(v1, v2) { 
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                // 为了让用户能够删除所有输入值,重新输入内容,删除所有值后,内容为空字符串 
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                if (v1 == '') return; 
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                let value = 0; 
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                // 首先判断是否数值,并且在min和max之间,如果不是,使用原来值 
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                let tmp = this.$u.test.number(v1); 
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                if (tmp && v1 >= this.min && v1 <= this.max) value = v1; 
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                else value = v2; 
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                // 判断是否只能输入大于等于0的整数 
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                if(this.positiveInteger) { 
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                    // 小于0,或者带有小数点, 
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                    if(v1 < 0 || String(v1).indexOf('.') !== -1) { 
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                        value = v2; 
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                        // 双向绑定input的值,必须要使用$nextTick修改显示的值 
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                        this.$nextTick(() => { 
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                            this.inputVal = v2; 
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                        }) 
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                    } 
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                } 
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                // 发出change事件 
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                this.handleChange(value, 'change'); 
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            } 
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        }, 
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        data() { 
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            return { 
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                inputVal: 1, // 输入框中的值,不能直接使用props中的value,因为应该改变props的状态 
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                timer: null, // 用作长按的定时器 
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                changeFromInner: false, // 值发生变化,是来自内部还是外部 
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                innerChangeTimer: null, // 内部定时器 
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            }; 
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        }, 
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        created() { 
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            this.inputVal = Number(this.value); 
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        }, 
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        computed: { 
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            getCursorSpacing() { 
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                // 先将值转为px单位,再转为数值 
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                return Number(uni.upx2px(this.cursorSpacing)); 
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            } 
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        }, 
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        methods: { 
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            // 点击退格键 
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            btnTouchStart(callback) { 
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                // 先执行一遍方法,否则会造成松开手时,就执行了clearTimer,导致无法实现功能 
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                this[callback](); 
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                // 如果没开启长按功能,直接返回 
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                if (!this.longPress) return; 
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                clearInterval(this.timer); //再次清空定时器,防止重复注册定时器 
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                this.timer = null; 
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                this.timer = setInterval(() => { 
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                    // 执行加或减函数 
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                    this[callback](); 
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                }, this.pressTime); 
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            }, 
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            clearTimer() { 
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                this.$nextTick(() => { 
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                    clearInterval(this.timer); 
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                    this.timer = null; 
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                }) 
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            }, 
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            minus() { 
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                this.computeVal('minus'); 
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            }, 
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            plus() { 
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                this.computeVal('plus'); 
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            }, 
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            // 为了保证小数相加减出现精度溢出的问题 
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            calcPlus(num1, num2) { 
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                let baseNum, baseNum1, baseNum2; 
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                try { 
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                    baseNum1 = num1.toString().split('.')[1].length; 
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                } catch (e) { 
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                    baseNum1 = 0; 
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                } 
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                try { 
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                    baseNum2 = num2.toString().split('.')[1].length; 
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                } catch (e) { 
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                    baseNum2 = 0; 
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                } 
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                baseNum = Math.pow(10, Math.max(baseNum1, baseNum2)); 
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                let precision = baseNum1 >= baseNum2 ? baseNum1 : baseNum2; //精度 
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                return ((num1 * baseNum + num2 * baseNum) / baseNum).toFixed(precision); 
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            }, 
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            // 为了保证小数相加减出现精度溢出的问题 
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            calcMinus(num1, num2) { 
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                let baseNum, baseNum1, baseNum2; 
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                try { 
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                    baseNum1 = num1.toString().split('.')[1].length; 
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                } catch (e) { 
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                    baseNum1 = 0; 
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                } 
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                try { 
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                    baseNum2 = num2.toString().split('.')[1].length; 
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                } catch (e) { 
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                    baseNum2 = 0; 
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                } 
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                baseNum = Math.pow(10, Math.max(baseNum1, baseNum2)); 
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                let precision = baseNum1 >= baseNum2 ? baseNum1 : baseNum2; 
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                return ((num1 * baseNum - num2 * baseNum) / baseNum).toFixed(precision); 
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            }, 
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            computeVal(type) { 
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                uni.hideKeyboard(); 
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                if (this.disabled) return; 
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                let value = 0; 
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                // 减 
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                if (type === 'minus') { 
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                    value = this.calcMinus(this.inputVal, this.step); 
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                } else if (type === 'plus') { 
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                    value = this.calcPlus(this.inputVal, this.step); 
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                } 
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                // 判断是否小于最小值和大于最大值 
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                if (value < this.min || value > this.max) { 
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                    return; 
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                } 
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                this.inputVal = value; 
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                this.handleChange(value, type); 
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            }, 
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            // 处理用户手动输入的情况 
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            onBlur(event) { 
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                let val = 0; 
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                let value = event.detail.value; 
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                // 如果为非0-9数字组成,或者其第一位数值为0,直接让其等于min值 
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                // 这里不直接判断是否正整数,是因为用户传递的props min值可能为0 
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                if (!/(^\d+$)/.test(value) || value[0] == 0) val = this.min; 
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                val = +value; 
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                if (val > this.max) { 
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                    val = this.max; 
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                } else if (val < this.min) { 
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                    val = this.min; 
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                } 
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                this.$nextTick(() => { 
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                    this.inputVal = val; 
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                }) 
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                this.handleChange(val, 'blur'); 
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            }, 
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            // 输入框获得焦点事件 
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            onFocus() { 
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                this.$emit('focus'); 
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            }, 
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            handleChange(value, type) { 
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                if (this.disabled) return; 
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                // 清除定时器,避免造成混乱 
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                if(this.innerChangeTimer) { 
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                    clearTimeout(this.innerChangeTimer); 
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                    this.innerChangeTimer = null; 
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                } 
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                // 发出input事件,修改通过v-model绑定的值,达到双向绑定的效果 
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                this.changeFromInner = true; 
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                // 一定时间内,清除changeFromInner标记,否则内部值改变后 
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                // 外部通过程序修改value值,将会无效 
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                this.innerChangeTimer = setTimeout(() => { 
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                    this.changeFromInner = false; 
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                }, 150); 
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                this.$emit('input', Number(value)); 
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                this.$emit(type, { 
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                    // 转为Number类型 
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                    value: Number(value), 
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                    index: this.index 
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                }) 
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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/style.components.scss"; 
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    .u-numberbox { 
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        display: inline-flex; 
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        align-items: center; 
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    } 
 | 
  
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    .u-number-input { 
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        position: relative; 
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        text-align: center; 
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        padding: 0; 
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        margin: 0 6rpx; 
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        @include vue-flex; 
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        align-items: center; 
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        justify-content: center; 
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    } 
 | 
  
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    .u-icon-plus, 
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    .u-icon-minus { 
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        width: 60rpx; 
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        @include vue-flex; 
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        justify-content: center; 
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        align-items: center; 
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    } 
 | 
  
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    .u-icon-plus { 
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        border-radius: 0 8rpx 8rpx 0; 
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    } 
 | 
  
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    .u-icon-minus { 
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        border-radius: 8rpx 0 0 8rpx; 
 | 
    } 
 | 
  
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    .u-icon-disabled { 
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        color: #c8c9cc !important; 
 | 
        background: #f7f8fa !important; 
 | 
    } 
 | 
  
 | 
    .u-input-disabled { 
 | 
        color: #c8c9cc !important; 
 | 
        background-color: #f2f3f5 !important; 
 | 
    } 
 | 
</style> 
 |