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271 lines
12 KiB
271 lines
12 KiB
3 years ago
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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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// 是否滑动中
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moving: false,
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// 状态，open-打开状态，close-关闭状态
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status: 'close',
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// 开始触摸点的X和Y轴坐标
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startX: 0,
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startY: 0,
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// 所有隐藏按钮的尺寸信息数组
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buttons: [],
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// 所有按钮的总宽度
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buttonsWidth: 0,
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// 记录上一次移动的位置值
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moveX: 0,
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// 记录上一次滑动的位置，用于前后两次做对比，如果移动的距离小于某一阈值，则认为前后之间没有移动，为了解决可能存在的通信阻塞问题
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lastX: 0
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}
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},
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computed: {
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// 获取过渡时间
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getDuratin() {
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let duration = String(this.duration)
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// 如果ms为单位，返回ms的数值部分
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if (duration.indexOf('ms') >= 0) return parseInt(duration)
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// 如果s为单位，为了得到ms的数值，需要乘以1000
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if (duration.indexOf('s') >= 0) return parseInt(duration) * 1000
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// 如果值传了数值，且小于30，认为是s单位
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duration = Number(duration)
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return duration < 30 ? duration * 1000 : duration
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}
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},
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watch: {
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show: {
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immediate: true,
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handler(n) {
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// if(n === true) {
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// uni.$u.sleep(50).then(() => {
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// this.openSwipeAction()
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// })
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// } else {
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// this.closeSwipeAction()
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// }
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}
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}
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},
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mounted() {
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uni.$u.sleep(20).then(() => {
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this.queryRect()
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})
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},
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methods: {
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close() {
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this.closeSwipeAction()
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},
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// 触摸单元格
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touchstart(event) {
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if (this.disabled) return
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this.closeOther()
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const { touches } = event
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// 记录触摸开始点的坐标值
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this.startX = touches[0].pageX
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this.startY = touches[0].pageY
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},
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// // 触摸滑动
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touchmove(event) {
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if (this.disabled) return
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const { touches } = event
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const { pageX } = touches[0]
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const { pageY } = touches[0]
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let moveX = pageX - this.startX
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const moveY = pageY - this.startY
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const { buttonsWidth } = this
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const len = this.buttons.length
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// 判断前后两次的移动距离，如果小于一定值，则不进行移动处理
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if (Math.abs(pageX - this.lastX) < 0.3) return
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this.lastX = pageX
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// 移动的X轴距离大于Y轴距离，也即终点与起点位置连线，与X轴夹角小于45度时，禁止页面滚动
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if (Math.abs(moveX) > Math.abs(moveY) || Math.abs(moveX) > this.threshold) {
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event.stopPropagation()
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}
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// 如果移动的X轴距离小于Y轴距离，也即终点位置与起点位置连线，与Y轴夹角小于45度时，认为是页面上下滑动，而不是左右滑动单元格
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if (Math.abs(moveX) < Math.abs(moveY)) return
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// 限制右滑的距离，不允许内容部分往右偏移，右滑会导致X轴偏移值大于0，以此做判断
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// 此处不能直接return，因为滑动过程中会缺失某些关键点坐标，会导致错乱，最好的办法就是
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// 在超出后，设置为0
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if (this.status === 'open') {
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// 在开启状态下，向左滑动，需忽略
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if (moveX < 0) moveX = 0
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// 想要收起菜单，最大能移动的距离为按钮的总宽度
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if (moveX > buttonsWidth) moveX = buttonsWidth
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// 如果是已经打开了的状态，向左滑动时，移动收起菜单
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this.moveSwipeAction(-buttonsWidth + moveX)
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} else {
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// 关闭状态下，右滑动需忽略
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if (moveX > 0) moveX = 0
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// 滑动的距离不允许超过所有按钮的总宽度，此时只能是左滑，最终设置按钮的总宽度，同时为负数
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if (Math.abs(moveX) > buttonsWidth) moveX = -buttonsWidth
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// 只要是在滑过程中，就不断移动菜单的内容部分，从而使隐藏的菜单显示出来
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this.moveSwipeAction(moveX)
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}
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},
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// 单元格结束触摸
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touchend(event) {
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if (this.disabled) return
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const touches = event.changedTouches ? event.changedTouches[0] : {}
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const { pageX } = touches
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const { pageY } = touches
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const { buttonsWidth } = this
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this.moveX = pageX - this.startX
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if (this.status === 'open') {
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// 在展开的状态下，继续左滑，无需操作
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if (this.moveX < 0) this.moveX = 0
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if (this.moveX > buttonsWidth) this.moveX = buttonsWidth
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// 在开启状态下，点击一下内容区域，moveX为0，也即没有进行移动，这时执行收起菜单逻辑
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if (this.moveX === 0) {
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return this.closeSwipeAction()
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}
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// 在开启状态下，滑动距离小于阈值，则默认为不关闭，同时恢复原来的打开状态
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if (Math.abs(this.moveX) < this.threshold) {
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this.openSwipeAction()
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} else {
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// 如果滑动距离大于阈值，则执行收起逻辑
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this.closeSwipeAction()
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}
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} else {
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// 在关闭的状态下，右滑，无需操作
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if (this.moveX >= 0) this.moveX = 0
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if (this.moveX <= -buttonsWidth) this.moveX = -buttonsWidth
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// 理由同上
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if (Math.abs(this.moveX) < this.threshold) {
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this.closeSwipeAction()
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} else {
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this.openSwipeAction()
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}
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}
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},
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// 移动滑动选择器内容区域，同时显示出其隐藏的菜单
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moveSwipeAction(moveX) {
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if (this.moving) return
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this.moving = true
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let previewButtonsMoveX = 0
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const len = this.buttons.length
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animation.transition(this.$refs['u-swipe-action-item__content'].ref, {
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styles: {
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transform: `translateX(${moveX}px)`
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},
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timingFunction: 'linear'
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}, () => {
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this.moving = false
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})
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// 按钮的组的长度
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for (let i = len - 1; i >= 0; i--) {
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const buttonRef = this.$refs[`u-swipe-action-item__right__button-${i}`][0].ref
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// 通过比例，得出元素自身该移动的距离
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const translateX = this.buttons[i].width / this.buttonsWidth * moveX
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// 最终移动的距离，是通过自身比例算出的距离，再加上在它之前所有按钮移动的距离之和
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const realTranslateX = translateX + previewButtonsMoveX
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animation.transition(buttonRef, {
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styles: {
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transform: `translateX(${realTranslateX}px)`
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},
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duration: 0,
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delay: 0,
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timingFunction: 'linear'
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}, () => {})
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// 记录本按钮之前的所有按钮的移动距离之和
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previewButtonsMoveX += translateX
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}
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},
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// 关闭菜单
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closeSwipeAction() {
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if (this.status === 'close') return
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this.moving = true
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const { buttonsWidth } = this
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animation.transition(this.$refs['u-swipe-action-item__content'].ref, {
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styles: {
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transform: 'translateX(0px)'
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},
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duration: this.getDuratin,
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timingFunction: 'ease-in-out'
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}, () => {
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this.status = 'close'
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this.moving = false
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this.closeHandler()
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})
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// 按钮的组的长度
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const len = this.buttons.length
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for (let i = len - 1; i >= 0; i--) {
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const buttonRef = this.$refs[`u-swipe-action-item__right__button-${i}`][0].ref
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// 如果不满足边界条件，返回
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if (this.buttons.length === 0 || !this.buttons[i] || !this.buttons[i].width) return
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animation.transition(buttonRef, {
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styles: {
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transform: 'translateX(0px)'
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},
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duration: this.getDuratin,
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timingFunction: 'ease-in-out'
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}, () => {})
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}
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},
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// 打开菜单
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openSwipeAction() {
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if (this.status === 'open') return
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this.moving = true
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const buttonsWidth = -this.buttonsWidth
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let previewButtonsMoveX = 0
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animation.transition(this.$refs['u-swipe-action-item__content'].ref, {
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styles: {
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transform: `translateX(${buttonsWidth}px)`
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},
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duration: this.getDuratin,
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timingFunction: 'ease-in-out'
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}, () => {
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this.status = 'open'
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this.moving = false
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this.openHandler()
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})
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// 按钮的组的长度
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const len = this.buttons.length
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for (let i = len - 1; i >= 0; i--) {
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const buttonRef = this.$refs[`u-swipe-action-item__right__button-${i}`][0].ref
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// 如果不满足边界条件，返回
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if (this.buttons.length === 0 || !this.buttons[i] || !this.buttons[i].width) return
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// 通过比例，得出元素自身该移动的距离
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const translateX = this.buttons[i].width / this.buttonsWidth * buttonsWidth
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// 最终移动的距离，是通过自身比例算出的距离，再加上在它之前所有按钮移动的距离之和
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const realTranslateX = translateX + previewButtonsMoveX
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animation.transition(buttonRef, {
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styles: {
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transform: `translateX(${realTranslateX}px)`
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},
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duration: this.getDuratin,
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timingFunction: 'ease-in-out'
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}, () => {})
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previewButtonsMoveX += translateX
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}
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},
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// 查询按钮节点信息
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queryRect() {
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// 历遍所有按钮数组，通过getRectByDom返回一个promise
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const promiseAll = this.rightOptions.map((item, index) => this.getRectByDom(this.$refs[`u-swipe-action-item__right__button-${index}`][0]))
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// 通过promise.all方法，让所有按钮的查询结果返回一个数组的形式
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Promise.all(promiseAll).then((sizes) => {
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this.buttons = sizes
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// 计算所有按钮总宽度
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this.buttonsWidth = sizes.reduce((sum, cur) => sum + cur.width, 0)
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})
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},
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// 通过nvue的dom模块，查询节点信息
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getRectByDom(ref) {
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return new Promise((resolve) => {
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dom.getComponentRect(ref, (res) => {
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resolve(res.size)
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})
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})
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}
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}
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}
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