一、前言

在华为快应用中官方提供了<slider>控件，但是这个控件的限制比较多，比如滑块无法自定义，所以这里进行下自定义，自己修改样式。

二、实现代码

整体效果如下:

源码如下:
custom_slider.ux

<template>
  <div id="container">
    <div id="progress-background"></div>
    <div id="progress-second" style="width: {{progressSecondWidth}}px"></div>
    <div id="slider" style="left: {{left}}px" ontouchmove="handleTouchMove"></div>
  </div>
</template>

<script>
    import prompt from '@system.prompt'
    export default {
        props: [
            'progress',
            'min',
            'max',
            'step'
        ],
        public: {
            progressSecondWidth: 0,
            left: 0,
            right: 0,//右侧可以滑动到的位置
            containerLeft: 0,
            containerRight: 0,
            stepWidth: 1, // 每一步滑动的距离，这个根据step值进行计算
            minDuration: 5, //滑动最小间距,小于这个间距不算滑动
        },
        onInit: function () {
            this.$on('onShow', this.onShow)
            this.$watch('progress', 'progressChange')
        },
        progressChange(newValue, oldValue) {
            console.log('progressChange:' + JSON.stringify(newValue))
            if(newValue === oldValue){
                return
            }
            this.sliderOtherProgress(newValue)
        },
        handleTouchMove(e) {
            let touchX = e.touches[0].clientX - this.containerLeft; // 获取触摸点的全局X坐标
            if (touchX - this.progressSecondWidth < -this.minDuration) {
                this.leftSlide()
            }
            if (touchX - this.progressSecondWidth > this.minDuration) {
                this.rightSlide()
            }
            this.emitChange()
        },
        onShow(e) {
            let that = this
            this.$element('container').getBoundingClientRect({
                success: function (data) {
                    const { top, bottom, left, right, width, height } = data;
                    prompt.showToast({
                        message: `getBoundingClientRect结果： width:${width}, height:${height},
                         top:${top}, bottom:${bottom}, left:${left}, right:${right}`
                    })
                    that.containerLeft = left
                    that.containerRight = right
                    that.right = right - left - 40 //40是滑块的宽度
                    that.computerStepWidth()
                },
                fail: (errorData, errorCode) => {
                    prompt.showToast({
                        message: `错误原因：${JSON.stringify(errorData)}, 错误代码：${errorCode}`
                    })
                },
                complete: function () {
                    console.info('complete')
                }
            })
        },
        //向左滑动
        leftSlide() {
            let nextWidth = this.progressSecondWidth - this.stepWidth
            if (nextWidth <= 0) {
                nextWidth = 0
            }
            this.progressSecondWidth = nextWidth
            this.left = nextWidth;
        },
        //向右滑动
        rightSlide() {
            let nextWidth = this.progressSecondWidth + this.stepWidth
            if (nextWidth >= this.right) {
                nextWidth = this.right
            }
            this.progressSecondWidth = nextWidth
            this.left = nextWidth;
        },
        computerStepWidth() {
            let progressMax = 100;
            let progressMin = 0;
            let progressStep = 1;
            let currentProgress = 0;
            if (this.max) {
                progressMax = this.max
            }
            if (this.min) {
                progressMin = this.min
            }
            if (this.step) {
                progressStep = this.step
            }
            if (this.progress) {
                currentProgress = this.progress
            }
            this.stepWidth = this.right / (progressMax - progressMin) * progressStep //获取每一步滑动的距离
            let currentProgressWidth = this.stepWidth * currentProgress
            this.progressSecondWidth = currentProgressWidth
        },
        sliderOtherProgress(progress){
            let nextWidth = progress + this.stepWidth
            if (nextWidth >= this.right) {
                nextWidth = this.right
            }
            if (nextWidth <= 0) {
                nextWidth = 0
            }
            this.progressSecondWidth = nextWidth
            this.left = nextWidth;
            this.emitChange()
        },
        emitChange() {
            let progress = Math.ceil(this.progressSecondWidth / this.stepWidth)
            this.$emit('change', {
                progress
            })
        }
    }
</script>

<style lang="less">
    #container {
      flex-grow: 1;
      height: 24px;
      display: flex;
    }
    #progress-background {
      flex-grow: 1;
      height: 4px;
      background-color: red;
      margin-top: 10px;
      border-radius: 4px;
    }
    #progress-second {
      height: 4px;
      background-color: pink;
      margin-top: 10px;
      border-radius: 4px;
      left: 0px;
      position: absolute;
    }
    #slider {
      width: 40px;
      height: 24px;
      background-color: #3b2204;
      position: absolute;
      border-radius: 12px;
    }
</style>

使用如下:

<import name="custom-slider" src="./custom_slider"></import>
...
<custom-slider onchange="progressChange" progress="{{customSliderProgress}}"></custom-slider>
<script>
    import prompt from '@system.prompt'
    export default {
    public: {
	    customSliderProgress: 30,
    },
    	progressChange(evt){
      		console.log("--->当前进度",evt.detail.progress);
    	},
    }
</script> 

...

三、参考链接

1. touch