258 lines
		
	
	
		
			6.6 KiB
		
	
	
	
		
			Python
		
	
	
	
			
		
		
	
	
			258 lines
		
	
	
		
			6.6 KiB
		
	
	
	
		
			Python
		
	
	
	
<template>
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	<view class="u-slider" @tap="onClick" :class="[disabled ? 'u-slider--disabled' : '']" :style="{
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		backgroundColor: inactiveColor
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	}">
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		<view
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			class="u-slider__gap"
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			:style="[
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				barStyle,
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				{
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					height: height + 'rpx',
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					backgroundColor: activeColor
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				}
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			]"
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		>
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			<view class="u-slider__button-wrap" @touchstart="onTouchStart" 
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				@touchmove="onTouchMove" @touchend="onTouchEnd" 
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				@touchcancel="onTouchEnd">
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				<slot v-if="$slots.default  || $slots.$default"/>
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				<view v-else class="u-slider__button" :style="[blockStyle, {
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					height: blockWidth + 'rpx',
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					width: blockWidth + 'rpx',
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					backgroundColor: blockColor
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				}]"></view>
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			</view>
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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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 * slider 滑块选择器
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 * @tutorial https://uviewui.com/components/slider.html
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 * @property {Number | String} value 滑块默认值(默认0)
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 * @property {Number | String} min 最小值(默认0)
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 * @property {Number | String} max 最大值(默认100)
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 * @property {Number | String} step 步长(默认1)
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 * @property {Number | String} blockWidth 滑块宽度,高等于宽(30)
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 * @property {Number | String} height 滑块条高度,单位rpx(默认6)
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 * @property {String} inactiveColor 底部条背景颜色(默认#c0c4cc)
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 * @property {String} activeColor 底部选择部分的背景颜色(默认#2979ff)
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 * @property {String} blockColor 滑块颜色(默认#ffffff)
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 * @property {Object} blockStyle 给滑块自定义样式,对象形式
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 * @property {Boolean} disabled 是否禁用滑块(默认为false)
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 * @event {Function} start 滑动触发
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 * @event {Function} moving 正在滑动中
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 * @event {Function} end 滑动结束
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 * @example <u-slider v-model="value" />
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 */
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export default {
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	name: 'u-slider',
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	props: {
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		// 当前进度百分比值,范围0-100
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		value: {
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			type: [Number, String],
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			default: 0
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		},
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		// 是否禁用滑块
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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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		// 滑块宽度,高等于宽,单位rpx
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		blockWidth: {
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			type: [Number, String],
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			default: 30
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		},
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		// 最小值
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		min: {
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			type: [Number, String],
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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, String],
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			default: 100
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		},
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		// 步进值
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		step: {
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			type: [Number, String],
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			default: 1
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		},
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		// 滑块条高度,单位rpx
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		height: {
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			type: [Number, String],
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			default: 6
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		},
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		// 进度条的激活部分颜色
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		activeColor: {
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			type: String,
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			default: '#2979ff'
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		},
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		// 进度条的背景颜色
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		inactiveColor: {
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			type: String,
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			default: '#c0c4cc'
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		},
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		// 滑块的背景颜色
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		blockColor: {
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			type: String,
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			default: '#ffffff'
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		},
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		// 用户对滑块的自定义颜色
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		blockStyle: {
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			type: Object,
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			default() {
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				return {};
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			}
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		},
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	},
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	data() {
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		return {
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			startX: 0,
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			status: 'end',
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			newValue: 0,
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			distanceX: 0,
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			startValue: 0,
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			barStyle: {},
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			sliderRect: {
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				left: 0,
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				width: 0
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			}
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		};
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	},
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	watch: {
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		value(n) {
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			// 只有在非滑动状态时,才可以通过value更新滑块值,这里监听,是为了让用户触发
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			if(this.status == 'end') this.updateValue(this.value, false);
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		}
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	},
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	created() {
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		this.updateValue(this.value, false);
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	},
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	mounted() {
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		// 获取滑块条的尺寸信息
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		this.$uGetRect('.u-slider').then(rect => {
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			this.sliderRect = rect;
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		});
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	},
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	methods: {
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		onTouchStart(event) {
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			if (this.disabled) return;
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			this.startX = 0;
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			// 触摸点集
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			let touches = event.touches[0];
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			// 触摸点到屏幕左边的距离
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			this.startX = touches.clientX;
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			// 此处的this.value虽为props值,但是通过$emit('input')进行了修改
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			this.startValue = this.format(this.value);
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			// 标示当前的状态为开始触摸滑动
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			this.status = 'start';
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		},
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		onTouchMove(event) {
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			if (this.disabled) return;
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			// 连续触摸的过程会一直触发本方法,但只有手指触发且移动了才被认为是拖动了,才发出事件
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			// 触摸后第一次移动已经将status设置为moving状态,故触摸第二次移动不会触发本事件
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			if (this.status == 'start') this.$emit('start');
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			let touches = event.touches[0];
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			// 滑块的左边不一定跟屏幕左边接壤,所以需要减去最外层父元素的左边值
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			this.distanceX = touches.clientX - this.sliderRect.left;
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			// 获得移动距离对整个滑块的百分比值,此为带有多位小数的值,不能用此更新视图
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			// 否则造成通信阻塞,需要每改变一个step值时修改一次视图
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			this.newValue = (this.distanceX / this.sliderRect.width) * 100;
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			this.status = 'moving';
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			// 发出moving事件
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			this.$emit('moving');
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			this.updateValue(this.newValue, true);
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		},
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		onTouchEnd() {
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			if (this.disabled) return;
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			if (this.status === 'moving') {
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				this.updateValue(this.newValue, false);
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				this.$emit('end');
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			}
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			this.status = 'end';
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		},
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		updateValue(value, drag) {
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			// 去掉小数部分,同时也是对step步进的处理
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			const width = this.format(value);
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			// 不允许滑动的值超过max最大值,百分比也不能超过100
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			if(width > this.max || width > 100) return;
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			// 设置移动的百分比值
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			let barStyle = {
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				width: width + '%'
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			};
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			// 移动期间无需过渡动画
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			if (drag == true) {
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				barStyle.transition = 'none';
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			} else {
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				// 非移动期间,删掉对过渡为空的声明,让css中的声明起效
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				delete barStyle.transition;
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			}
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			// 修改value值
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			this.$emit('input', width);
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			this.barStyle = barStyle;
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		},
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		format(value) {
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			// 将小数变成整数,为了减少对视图的更新,造成视图层与逻辑层的阻塞
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			return Math.round(Math.max(this.min, Math.min(value, this.max)) / this.step) * this.step;
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		},
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		onClick(event) {
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			if (this.disabled) return;
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			// 直接点击滑块的情况,计算方式与onTouchMove方法相同
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			const value = ((event.detail.x - this.sliderRect.left) / this.sliderRect.width) * 100;
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			this.updateValue(value, false);
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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-slider {
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	position: relative;
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	border-radius: 999px;
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	border-radius: 999px;
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	background-color: #ebedf0;
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}
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.u-slider:before {
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	position: absolute;
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	right: 0;
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	left: 0;
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	content: '';
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	top: -8px;
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	bottom: -8px;
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	z-index: -1;
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}
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.u-slider__gap {
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	position: relative;
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	border-radius: inherit;
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	transition: width 0.2s;
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	transition: width 0.2s;
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	background-color: #1989fa;
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}
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.u-slider__button {
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	width: 24px;
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	height: 24px;
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	border-radius: 50%;
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	box-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
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	background-color: #fff;
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	cursor: pointer;
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}
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.u-slider__button-wrap {
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	position: absolute;
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	top: 50%;
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	right: 0;
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	transform: translate3d(50%, -50%, 0);
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}
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.u-slider--disabled {
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	opacity: 0.5;
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}
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</style>
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