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export default {
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data() {
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return {
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state: {
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moving: false,
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startX: 0,
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startY: 0,
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buttonsWidth: 0
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}
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}
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},
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watch: {
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status(newValue) {
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if (this.disabled) return
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// 打开或关闭单元格
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if (newValue === 'close' && this.status === 'open') {
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this.closeSwipeAction()
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} else if(newValue === 'open' && this.status === 'close') {
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this.openSwipeAction()
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}
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},
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options(newVal) {
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this.getBtnWidth()
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}
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},
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mounted() {
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this.getBtnWidth()
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},
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methods: {
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clickHandler() {
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},
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closeHandler() {
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this.closeSwipeAction()
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},
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setStatus(status) {
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this.status = status
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},
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getBtnWidth() {
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let view = uni.createSelectorQuery().in(this).select(".u-swipe-action-item__right");
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view.fields({
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size: true,
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scrollOffset: true
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}, data => {
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this.state.buttonsWidth = data.width
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// console.log("得到节点信息" + JSON.stringify(data));
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}).exec();
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},
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// 开始触摸
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touchstart(event) {
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// console.log(event)
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// 标识当前为滑动中状态
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this.state.moving = true
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// 记录触摸开始点的坐标值
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var touches = event.touches
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this.state.startX = touches[0].pageX
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this.state.startY = touches[0].pageY
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// 关闭其它
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// console.log(this.parent)
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this.parent && this.parent.closeOther(this)
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},
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touchmove(event) {
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// console.log(event)
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if (this.disabled || !this.state.moving) return
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var touches = event.touches
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var pageX = touches[0].pageX
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var pageY = touches[0].pageY
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var moveX = pageX - this.state.startX
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var moveY = pageY - this.state.startY
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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.preventDefault && event.preventDefault()
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event.stopPropagation && 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 > this.state.buttonsWidth) moveX = this.state.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(-this.state.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) > this.state.buttonsWidth) moveX = -this.state.buttonsWidth
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// 只要是在滑过程中,就不断移动单元格内容部分,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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touchend(event) {
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// console.log(event)
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if (!this.state.moving || this.disabled) return
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this.state.moving = false
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var touches = event.changedTouches ? event.changedTouches[0] : {}
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var pageX = touches.pageX
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var pageY = touches.pageY
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var moveX = pageX - this.state.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 (moveX < 0) return
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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 (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(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 (moveX > 0) return
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// 理由同上
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if (Math.abs(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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// 一次性展开滑动菜单
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openSwipeAction() {
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// 处理duration单位问题
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var duration = this.getDuration(this.duration)
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// 展开过程中,是向左移动,所以X的偏移应该为负值
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var buttonsWidth = -this.state.buttonsWidth
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this.sliderStyle = {
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'transition': 'transform ' + duration,
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'transform': 'translateX(' + buttonsWidth + 'px)',
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'-webkit-transform': 'translateX(' + buttonsWidth + 'px)',
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}
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this.setStatus('open')
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},
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// 一次性收起滑动菜单
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closeSwipeAction() {
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// 处理duration单位问题
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var duration = this.getDuration(this.duration)
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this.sliderStyle = {
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'transition': 'transform ' + duration,
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'transform': 'translateX(0px)',
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'-webkit-transform': 'translateX(0px)'
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}
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// 设置各个隐藏的按钮为收起的状态
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// for (var i = this.state.buttonsWidth - 1; i >= 0; i--) {
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// buttons[i].setStyle({
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// 'transition': 'transform ' + duration,
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// 'transform': 'translateX(0px)',
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// '-webkit-transform': 'translateX(0px)'
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// })
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// }
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this.setStatus('close')
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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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// 设置菜单内容部分的偏移
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this.sliderStyle = {
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'transition': 'none',
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transform: 'translateX(' + moveX + 'px)',
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'-webkit-transform': 'translateX(' + moveX + 'px)'
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}
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},
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// 获取过渡时间
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getDuration(value) {
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if (value.toString().indexOf('s') >= 0) return value
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return value > 30 ? value + 'ms' : value + 's'
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}
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}
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}
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