wszhyWx/components/u-slider/u-slider.vue

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<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>