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181 lines
5.3 KiB
181 lines
5.3 KiB
2 years ago
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/**
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* 使用bindingx方案实现slider
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* 只能使用于nvue下
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*/
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// 引入bindingx，此库类似于微信小程序wxs，目的是让js运行在视图层，减少视图层和逻辑层的通信折损
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const BindingX = uni.requireNativePlugin('bindingx')
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// nvue操作dom的库，用于获取dom的尺寸信息
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const dom = uni.requireNativePlugin('dom')
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// nvue中用于操作元素动画的库，类似于uni.animation，只不过uni.animation不能用于nvue
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const animation = uni.requireNativePlugin('animation')
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export default {
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data() {
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return {
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// bindingx的回调值，用于取消绑定
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panEvent: null,
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// 标记是否移动状态
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moving: false,
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// 位移的偏移量
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x: 0,
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// 是否正在触摸过程中，用于标记动画类是否添加或移除
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touching: false,
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changeFromInside: false
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}
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},
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watch: {
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// 监听vlaue的变化，此变化可能是由于内部修改v-model的值，或者外部
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// 从服务端获取一个值后，赋值给slider的v-model而导致的
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value(n) {
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if (!this.changeFromInside) {
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this.initX()
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} else {
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this.changeFromInside = false
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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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// 获取节点信息
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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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// 通过nvue的dom模块，查询节点信息
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setTimeout(() => {
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dom.getComponentRect(this.$refs['slider'], res => {
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this.sliderRect = res.size
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this.initX()
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})
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}, 10)
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},
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// 初始化按钮位置
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initButtonStyle({
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barStyle,
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buttonWrapperStyle
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}) {
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this.barStyle = barStyle
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this.buttonWrapperStyle = buttonWrapperStyle
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},
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emitEvent(event, value) {
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this.$emit(event, value ? value : this.value)
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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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// 滑动开始
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onTouchStart(e) {
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// 阻止页面滚动，可以保证在滑动过程中，不让页面可以上下滚动，造成不好的体验
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e.stopPropagation && e.stopPropagation()
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e.preventDefault && e.preventDefault()
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if (this.moving || this.disabled) {
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// 释放上一次的资源
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if (this.panEvent?.token != 0) {
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BindingX.unbind({
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token: this.panEvent.token,
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// pan为手势事件
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eventType: 'pan'
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})
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this.gesToken = 0
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}
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return
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}
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this.moving = true
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this.touching = true
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// 获取元素ref
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const button = this.$refs['nvue-button'].ref
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const gap = this.$refs['nvue-gap'].ref
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const {
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min,
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max,
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step
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} = this
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const {
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left,
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width
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} = this.sliderRect
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// 初始值为本次偏移量x，加上次停止滑动时的结束值
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let exporession = `(${this.x} + x)`
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// 将偏移的x值，转为总位移的百分比值，为了和min和max进行判断
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exporession = `(${exporession} / ${width}) * 100`
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if (step > 1) {
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// 如果step步进大于1，需要跳步，所以需要使用Math.round进行取整
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exporession = `round(max(${min}, min(${exporession}, ${max})) / ${step}) * ${step}`
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} else {
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// 当step=1时，无需跳步，充分利用bindingx性能，滑块实时跟随手势，达到丝滑的效果
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exporession = `max(${min}, min(${exporession}, ${max}))`
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}
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// 将百分比最后转化为对应的px值
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exporession = `${exporession} / 100 * ${width}`
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// 最大值不允许超过轨迹的宽度
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const {
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sliderWidth
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} = this.sliderRect
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exporession = `min(${sliderWidth}, ${exporession})`
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// 滑块点总是需要一个左偏移的值，为自身宽度的一半
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const buttonExpression = `${exporession} - ${this.blockHeight / 2}`
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// 阿里为了KPI而开源的BindingX
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this.panEvent = BindingX.bind({
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anchor: button,
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eventType: 'pan',
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props: [{
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element: gap,
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// 绑定width属性，设置其宽度值
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property: 'width',
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expression
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}, {
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element: button,
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// 绑定width属性，设置其宽度值
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property: 'transform.translateX',
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expression: buttonExpression
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}]
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}, (e) => {
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if (e.state === 'end' || e.state === 'exit') {
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//
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this.x = uni.$u.range(0, left + width, e.deltaX + this.x)
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// 根据偏移值，得出移动的百分比，进而修改双向绑定的v-model的值
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const value = (this.x / width) * 100
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const percent = this.formatStep(value)
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// 修改value值
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this.$emit('input', percent)
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// 标记下一次触发value的watch时，这个值的变化，是由内部改变的
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this.changeFromInside = true
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this.moving = false
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this.touching = false
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}
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})
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},
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// 从value的变化，倒推得出x的值该为多少
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initX() {
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const {
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left,
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width
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} = this.sliderRect
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// 得出x的初始偏移值，之所以需要这么做，是因为在bindingX中，触摸滑动时，只能的值本次移动的偏移值
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// 而无法的值准确的前后移动的两个点的坐标值，weex纯粹为阿里巴巴的KPI(部门业绩考核)产物，也就这样了
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this.x = this.value / 100 * width
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// 设置移动的值
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const barStyle = {
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width: this.x + 'px'
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}
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// 按钮的初始值
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const buttonWrapperStyle = {
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transform: `translateX(${this.x - this.blockHeight / 2}px)`
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}
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this.initButtonStyle({
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barStyle,
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buttonWrapperStyle
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})
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}
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}
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}
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