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113 lines
3.8 KiB
113 lines
3.8 KiB
/**
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* 使用普通的js方案实现slider
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*/
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export default {
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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') {
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this.updateSliderPlacement(n, true)
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}
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}
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},
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mounted() {
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this.init()
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},
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methods: {
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init() {
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this.getSliderRect()
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},
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// 获取slider尺寸
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getSliderRect() {
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// 获取滑块条的尺寸信息
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setTimeout(() => {
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this.$uGetRect('.u-slider').then((rect) => {
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this.sliderRect = rect
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this.updateSliderPlacement(this.value, true)
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})
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}, 10)
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},
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// 是否可以操作
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canNotDo() {
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return this.disabled
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},
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// 获取当前手势点的X轴位移值
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getTouchX(e) {
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return e.touches[0].clientX
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},
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formatStep(value) {
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// 移动点占总长度的百分比
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return Math.round(Math.max(this.min, Math.min(value, this.max)) / this.step) * this.step
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},
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// 发出事件
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emitEvent(event, value) {
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this.$emit(event, value || this.value)
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},
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// 标记当前手势的状态
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setTouchStatus(status) {
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this.status = status
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},
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onTouchStart(e) {
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if (this.canNotDo()) {
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return
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}
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// 标示当前的状态为开始触摸滑动
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this.emitEvent('start')
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this.setTouchStatus('start')
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},
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onTouchMove(e) {
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if (this.canNotDo()) {
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return
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}
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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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const x = this.getTouchX(e)
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const { left, width } = this.sliderRect
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const distanceX = x - 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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const percent = (distanceX / width) * 100
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this.setTouchStatus('moving')
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this.updateSliderPlacement(percent, true, 'moving')
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},
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onTouchEnd() {
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if (this.canNotDo()) {
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return
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}
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this.emitEvent('end')
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this.setTouchStatus('end')
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},
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// 设置滑点的位置
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updateSliderPlacement(value, drag, event) {
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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.sliderRect
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const percent = this.formatStep(value)
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// 设置移动的值
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const barStyle = {
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width: `${percent / 100 * width}px`
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}
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// 移动期间无需过渡动画
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if (drag === true) {
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barStyle.transition = 'none'
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} else {
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// 非移动期间，删掉对过渡为空的声明，让css中的声明起效
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delete barStyle.transition
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}
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// 修改value值
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this.$emit('input', percent)
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// 事件的名称
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if (event) {
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this.emitEvent(event, percent)
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}
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this.barStyle = barStyle
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},
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onClick(e) {
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if (this.canNotDo()) {
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return
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}
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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 { left, width } = this.sliderRect
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const value = ((e.detail.x - left) / width) * 100
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this.updateSliderPlacement(value, false, 'click')
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}
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}
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}
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