You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

258 lines
8.1 KiB
Vue

This file contains ambiguous Unicode characters!

This file contains ambiguous Unicode characters that may be confused with others in your current locale. If your use case is intentional and legitimate, you can safely ignore this warning. Use the Escape button to highlight these characters.

<template>
<view class="u-slider" @tap="onClick" :class="[disabled ? 'u-slider--disabled' : '']" :style="{
backgroundColor: inactiveColor
}">
<view
class="u-slider__gap"
:style="[
barStyle,
{
height: height + 'rpx',
backgroundColor: activeColor
}
]"
>
<view class="u-slider__button-wrap" @touchstart="onTouchStart"
@touchmove="onTouchMove" @touchend="onTouchEnd"
@touchcancel="onTouchEnd">
<slot v-if="$slots.default || $slots.$default"/>
<view v-else class="u-slider__button" :style="[blockStyle, {
height: blockWidth + 'rpx',
width: blockWidth + 'rpx',
backgroundColor: blockColor
}]"></view>
</view>
</view>
</view>
</template>
<script>
/**
* slider 滑块选择器
* @tutorial https://uviewui.com/components/slider.html
* @property {Number | String} value 滑块默认值默认0
* @property {Number | String} min 最小值默认0
* @property {Number | String} max 最大值默认100
* @property {Number | String} step 步长默认1
* @property {Number | String} blockWidth 滑块宽度高等于宽30
* @property {Number | String} height 滑块条高度单位rpx默认6
* @property {String} inactiveColor 底部条背景颜色(默认#c0c4cc
* @property {String} activeColor 底部选择部分的背景颜色(默认#2979ff
* @property {String} blockColor 滑块颜色(默认#ffffff
* @property {Object} blockStyle 给滑块自定义样式,对象形式
* @property {Boolean} disabled 是否禁用滑块(默认为false)
* @event {Function} start 滑动触发
* @event {Function} moving 正在滑动中
* @event {Function} end 滑动结束
* @example <u-slider v-model="value" />
*/
export default {
name: 'u-slider',
props: {
// 当前进度百分比值范围0-100
value: {
type: [Number, String],
default: 0
},
// 是否禁用滑块
disabled: {
type: Boolean,
default: false
},
// 滑块宽度高等于宽单位rpx
blockWidth: {
type: [Number, String],
default: 30
},
// 最小值
min: {
type: [Number, String],
default: 0
},
// 最大值
max: {
type: [Number, String],
default: 100
},
// 步进值
step: {
type: [Number, String],
default: 1
},
// 滑块条高度单位rpx
height: {
type: [Number, String],
default: 6
},
// 进度条的激活部分颜色
activeColor: {
type: String,
default: '#2979ff'
},
// 进度条的背景颜色
inactiveColor: {
type: String,
default: '#c0c4cc'
},
// 滑块的背景颜色
blockColor: {
type: String,
default: '#ffffff'
},
// 用户对滑块的自定义颜色
blockStyle: {
type: Object,
default() {
return {};
}
},
},
data() {
return {
startX: 0,
status: 'end',
newValue: 0,
distanceX: 0,
startValue: 0,
barStyle: {},
sliderRect: {
left: 0,
width: 0
}
};
},
watch: {
value(n) {
// 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
if(this.status == 'end') this.updateValue(this.value, false);
}
},
created() {
this.updateValue(this.value, false);
},
mounted() {
// 获取滑块条的尺寸信息
this.$uGetRect('.u-slider').then(rect => {
this.sliderRect = rect;
});
},
methods: {
onTouchStart(event) {
if (this.disabled) return;
this.startX = 0;
// 触摸点集
let touches = event.touches[0];
// 触摸点到屏幕左边的距离
this.startX = touches.clientX;
// 此处的this.value虽为props值但是通过$emit('input')进行了修改
this.startValue = this.format(this.value);
// 标示当前的状态为开始触摸滑动
this.status = 'start';
},
onTouchMove(event) {
if (this.disabled) return;
// 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
// 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
if (this.status == 'start') this.$emit('start');
let touches = event.touches[0];
// 滑块的左边不一定跟屏幕左边接壤,所以需要减去最外层父元素的左边值
this.distanceX = touches.clientX - this.sliderRect.left;
// 获得移动距离对整个滑块的百分比值,此为带有多位小数的值,不能用此更新视图
// 否则造成通信阻塞需要每改变一个step值时修改一次视图
this.newValue = (this.distanceX / this.sliderRect.width) * 100;
this.status = 'moving';
// 发出moving事件
this.$emit('moving');
this.updateValue(this.newValue, true);
},
onTouchEnd() {
if (this.disabled) return;
if (this.status === 'moving') {
this.updateValue(this.newValue, false);
this.$emit('end');
}
this.status = 'end';
},
updateValue(value, drag) {
// 去掉小数部分同时也是对step步进的处理
const width = this.format(value);
// 不允许滑动的值超过max最大值百分比也不能超过100
if(width > this.max || width > 100) return;
// 设置移动的百分比值
let barStyle = {
width: width + '%'
};
// 移动期间无需过渡动画
if (drag == true) {
barStyle.transition = 'none';
} else {
// 非移动期间删掉对过渡为空的声明让css中的声明起效
delete barStyle.transition;
}
// 修改value值
this.$emit('input', width);
this.barStyle = barStyle;
},
format(value) {
// 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
return Math.round(Math.max(this.min, Math.min(value, this.max)) / this.step) * this.step;
},
onClick(event) {
if (this.disabled) return;
// 直接点击滑块的情况计算方式与onTouchMove方法相同
const value = ((event.detail.x - this.sliderRect.left) / this.sliderRect.width) * 100;
this.updateValue(value, false);
}
}
};
</script>
<style lang="scss" scoped>
@import "../../libs/css/style.components.scss";
.u-slider {
position: relative;
border-radius: 999px;
border-radius: 999px;
background-color: #ebedf0;
}
.u-slider:before {
position: absolute;
right: 0;
left: 0;
content: '';
top: -8px;
bottom: -8px;
z-index: -1;
}
.u-slider__gap {
position: relative;
border-radius: inherit;
transition: width 0.2s;
transition: width 0.2s;
background-color: #1989fa;
}
.u-slider__button {
width: 24px;
height: 24px;
border-radius: 50%;
box-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
background-color: #fff;
cursor: pointer;
}
.u-slider__button-wrap {
position: absolute;
top: 50%;
right: 0;
transform: translate3d(50%, -50%, 0);
}
.u-slider--disabled {
opacity: 0.5;
}
</style>