226 lines
7.9 KiB
Plaintext
226 lines
7.9 KiB
Plaintext
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/**
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* 此为wxs模块，只支持APP-VUE，微信和QQ小程序以及H5平台
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* wxs内部不支持es6语法，变量只能使用var定义，无法使用解构，箭头函数等特性
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*/
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// 开始触摸
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function touchstart(event, ownerInstance) {
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// 触发事件的组件的ComponentDescriptor实例
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var instance = event.instance
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// wxs内的局部变量快照，此快照是属于整个组件的，在touchstart和touchmove事件中都能获取到相同的结果
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var state = instance.getState()
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if (state.disabled) return
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var touches = event.touches
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// 如果进行的是多指触控，不允许进行操作
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if (touches && touches.length > 1) return
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// 标识当前为滑动中状态
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state.moving = true
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// 记录触摸开始点的坐标值
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state.startX = touches[0].pageX
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state.startY = touches[0].pageY
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ownerInstance.callMethod('closeOther')
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}
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// 触摸滑动
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function touchmove(event, ownerInstance) {
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// 触发事件的组件的ComponentDescriptor实例
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var instance = event.instance
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// wxs内的局部变量快照
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var state = instance.getState()
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if (state.disabled || !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 - state.startX
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var moveY = pageY - state.startY
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var buttonsWidth = state.buttonsWidth
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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) > state.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 (state.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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moveSwipeAction(-buttonsWidth + moveX, instance, ownerInstance)
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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，就不断移动单元格内容部分，从而使隐藏的菜单显示出来
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moveSwipeAction(moveX, instance, ownerInstance)
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}
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}
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// 触摸结束
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function touchend(event, ownerInstance) {
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// 触发事件的组件的ComponentDescriptor实例
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var instance = event.instance
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// wxs内的局部变量快照
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var state = instance.getState()
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if (!state.moving || state.disabled) return
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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 - state.startX
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if (state.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 closeSwipeAction(instance, ownerInstance)
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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) < state.threshold) {
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openSwipeAction(instance, ownerInstance)
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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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closeSwipeAction(instance, ownerInstance)
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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) < state.threshold) {
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closeSwipeAction(instance, ownerInstance)
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} else {
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openSwipeAction(instance, ownerInstance)
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}
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}
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}
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// 获取过渡时间
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function 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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// 滑动结束时判断滑动的方向
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function getMoveDirection(instance, ownerInstance) {
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var state = instance.getState()
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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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function moveSwipeAction(moveX, instance, ownerInstance) {
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var state = instance.getState()
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// 获取所有按钮的实例，需要通过它去设置按钮的位移
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var buttons = ownerInstance.selectAllComponents('.u-swipe-action-item__right__button')
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// 设置菜单内容部分的偏移
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instance.requestAnimationFrame(function() {
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instance.setStyle({
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// 设置translateX的值
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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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}
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// 一次性展开滑动菜单
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function openSwipeAction(instance, ownerInstance) {
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var state = instance.getState()
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// 获取所有按钮的实例，需要通过它去设置按钮的位移
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var buttons = ownerInstance.selectAllComponents('.u-swipe-action-item__right__button')
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// 处理duration单位问题
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var duration = getDuration(state.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 = -state.buttonsWidth
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instance.requestAnimationFrame(function() {
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// 设置菜单主体内容
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instance.setStyle({
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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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})
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setStatus('open', instance, ownerInstance)
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}
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// 标记菜单的当前状态，open-已经打开，close-已经关闭
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function setStatus(status, instance, ownerInstance) {
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var state = instance.getState()
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state.status = status
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ownerInstance.callMethod('setState', status)
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}
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// 一次性收起滑动菜单
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function closeSwipeAction(instance, ownerInstance) {
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var state = instance.getState()
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// 获取所有按钮的实例，需要通过它去设置按钮的位移
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var buttons = ownerInstance.selectAllComponents('.u-swipe-action-item__right__button')
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var len = buttons.length
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// 处理duration单位问题
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var duration = getDuration(state.duration)
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instance.requestAnimationFrame(function() {
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// 设置菜单主体内容
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instance.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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// 设置各个隐藏的按钮为收起的状态
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for (var i = len - 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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})
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setStatus('close', instance, ownerInstance)
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}
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// status的状态发生变化
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function statusChange(newValue, oldValue, ownerInstance, instance) {
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var state = instance.getState()
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if (state.disabled) return
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// 打开或关闭单元格
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if (newValue === 'close' && state.status === 'open') {
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closeSwipeAction(instance, ownerInstance)
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} else if(newValue === 'open' && state.status === 'close') {
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openSwipeAction(instance, ownerInstance)
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}
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}
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// 菜单尺寸发生变化
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function sizeChange(newValue, oldValue, ownerInstance, instance) {
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// wxs内的局部变量快照
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var state = instance.getState()
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state.disabled = newValue.disabled
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state.duration = newValue.duration
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state.show = newValue.show
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state.threshold = newValue.threshold
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state.buttons = newValue.buttons
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if (state.buttons) {
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var len = state.buttons.length
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var buttonsWidth = 0
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var buttons = newValue.buttons
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for (var i = 0; i < len; i++) {
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buttonsWidth += buttons[i].width
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}
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}
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state.buttonsWidth = buttonsWidth
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}
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module.exports = {
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touchstart: touchstart,
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touchmove: touchmove,
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touchend: touchend,
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sizeChange: sizeChange,
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statusChange: statusChange
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}
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