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			413 lines
		
	
	
		
			12 KiB
		
	
	
	
		
			Vue
		
	
	
	
	
	
			
		
		
	
	
			413 lines
		
	
	
		
			12 KiB
		
	
	
	
		
			Vue
		
	
	
	
	
	
<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" scoped>
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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;
 | 
						||
			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>
 |