364 lines
		
	
	
		
			11 KiB
		
	
	
	
		
			Python
		
	
	
	
			
		
		
	
	
			364 lines
		
	
	
		
			11 KiB
		
	
	
	
		
			Python
		
	
	
	
| <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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| 
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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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| 
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| <style lang="scss" scoped>
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| 	@import "../../libs/css/style.components.scss";
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| 
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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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| 
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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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| 
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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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| 
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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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| 
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| 	.u-icon-minus {
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| 		border-radius: 8rpx 0 0 8rpx;
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| 	}
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| 
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| 	.u-icon-disabled {
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| 		color: #c8c9cc !important;
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| 		background: #f7f8fa !important;
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| 	}
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| 
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| 	.u-input-disabled {
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| 		color: #c8c9cc !important;
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| 		background-color: #f2f3f5 !important;
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| 	}
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| </style>
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