258 lines
6.6 KiB
Vue
258 lines
6.6 KiB
Vue
<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>
|