256 lines
6.7 KiB
Vue
256 lines
6.7 KiB
Vue
<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"/>
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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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// 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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