gree_leran/node_modules/uview-plus/components/u-swipe-action-item/alipay.sjs

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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
* 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
*/
// 开始触摸
function touchstart(event, ownerInstance) {
// 触发事件的组件的ComponentDescriptor实例
var instance = event.instance
// 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
var state = instance.getState()
if (state.disabled) return
var touches = event.touches
// 如果进行的是多指触控,不允许进行操作
if (touches && touches.length > 1) return
// 标识当前为滑动中状态
state.moving = true
// 记录触摸开始点的坐标值
state.startX = touches[0].pageX
state.startY = touches[0].pageY
ownerInstance.callMethod('closeOther')
}
// 触摸滑动
function touchmove(event, ownerInstance) {
// 触发事件的组件的ComponentDescriptor实例
var instance = event.instance
// wxs内的局部变量快照
var state = instance.getState()
if (state.disabled || !state.moving) return
var touches = event.touches
var pageX = touches[0].pageX
var pageY = touches[0].pageY
var moveX = pageX - state.startX
var moveY = pageY - state.startY
var buttonsWidth = state.buttonsWidth
// 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
if (Math.abs(moveX) > Math.abs(moveY) || Math.abs(moveX) > state.threshold) {
event.preventDefault && event.preventDefault()
event.stopPropagation && event.stopPropagation()
}
// 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
if (Math.abs(moveX) < Math.abs(moveY)) return
// 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
// 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
// 在超出后设置为0
if (state.status === 'open') {
// 在开启状态下,向左滑动,需忽略
if (moveX < 0) moveX = 0
// 想要收起菜单,最大能移动的距离为按钮的总宽度
if (moveX > buttonsWidth) moveX = buttonsWidth
// 如果是已经打开了的状态,向左滑动时,移动收起菜单
moveSwipeAction(-buttonsWidth + moveX, instance, ownerInstance)
} else {
// 关闭状态下,右滑动需忽略
if (moveX > 0) moveX = 0
// 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
if (Math.abs(moveX) > buttonsWidth) moveX = -buttonsWidth
// 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
moveSwipeAction(moveX, instance, ownerInstance)
}
}
// 触摸结束
function touchend(event, ownerInstance) {
// 触发事件的组件的ComponentDescriptor实例
var instance = event.instance
// wxs内的局部变量快照
var state = instance.getState()
if (!state.moving || state.disabled) return
var touches = event.changedTouches ? event.changedTouches[0] : {}
var pageX = touches.pageX
var pageY = touches.pageY
var moveX = pageX - state.startX
if (state.status === 'open') {
// 在展开的状态下,继续左滑,无需操作
if (moveX < 0) return
// 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
if (moveX === 0) {
return closeSwipeAction(instance, ownerInstance)
}
// 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
if (Math.abs(moveX) < state.threshold) {
openSwipeAction(instance, ownerInstance)
} else {
// 如果滑动距离大于阈值,则执行收起逻辑
closeSwipeAction(instance, ownerInstance)
}
} else {
// 在关闭的状态下,右滑,无需操作
if (moveX > 0) return
// 理由同上
if (Math.abs(moveX) < state.threshold) {
closeSwipeAction(instance, ownerInstance)
} else {
openSwipeAction(instance, ownerInstance)
}
}
}
// 获取过渡时间
function getDuration(value) {
if (value.toString().indexOf('s') >= 0) return value
return value > 30 ? value + 'ms' : value + 's'
}
// 滑动结束时判断滑动的方向
function getMoveDirection(instance, ownerInstance) {
var state = instance.getState()
}
// 移动滑动选择器内容区域,同时显示出其隐藏的菜单
function moveSwipeAction(moveX, instance, ownerInstance) {
var state = instance.getState()
// 获取所有按钮的实例,需要通过它去设置按钮的位移
var buttons = ownerInstance.selectAllComponents('.u-swipe-action-item__right__button')
// 设置菜单内容部分的偏移
instance.requestAnimationFrame(function() {
instance.setStyle({
// 设置translateX的值
'transition': 'none',
transform: 'translateX(' + moveX + 'px)',
'-webkit-transform': 'translateX(' + moveX + 'px)'
})
})
}
// 一次性展开滑动菜单
function openSwipeAction(instance, ownerInstance) {
var state = instance.getState()
// 获取所有按钮的实例,需要通过它去设置按钮的位移
var buttons = ownerInstance.selectAllComponents('.u-swipe-action-item__right__button')
// 处理duration单位问题
var duration = getDuration(state.duration)
// 展开过程中是向左移动所以X的偏移应该为负值
var buttonsWidth = -state.buttonsWidth
instance.requestAnimationFrame(function() {
// 设置菜单主体内容
instance.setStyle({
'transition': 'transform ' + duration,
'transform': 'translateX(' + buttonsWidth + 'px)',
'-webkit-transform': 'translateX(' + buttonsWidth + 'px)',
})
})
setStatus('open', instance, ownerInstance)
}
// 标记菜单的当前状态open-已经打开close-已经关闭
function setStatus(status, instance, ownerInstance) {
var state = instance.getState()
state.status = status
ownerInstance.callMethod('setState', status)
}
// 一次性收起滑动菜单
function closeSwipeAction(instance, ownerInstance) {
var state = instance.getState()
// 获取所有按钮的实例,需要通过它去设置按钮的位移
var buttons = ownerInstance.selectAllComponents('.u-swipe-action-item__right__button')
var len = buttons.length
// 处理duration单位问题
var duration = getDuration(state.duration)
instance.requestAnimationFrame(function() {
// 设置菜单主体内容
instance.setStyle({
'transition': 'transform ' + duration,
'transform': 'translateX(0px)',
'-webkit-transform': 'translateX(0px)'
})
// 设置各个隐藏的按钮为收起的状态
for (var i = len - 1; i >= 0; i--) {
buttons[i].setStyle({
'transition': 'transform ' + duration,
'transform': 'translateX(0px)',
'-webkit-transform': 'translateX(0px)'
})
}
})
setStatus('close', instance, ownerInstance)
}
// status的状态发生变化
function statusChange(newValue, oldValue, ownerInstance, instance) {
var state = instance.getState()
if (state.disabled) return
// 打开或关闭单元格
if (newValue === 'close' && state.status === 'open') {
closeSwipeAction(instance, ownerInstance)
} else if(newValue === 'open' && state.status === 'close') {
openSwipeAction(instance, ownerInstance)
}
}
// 菜单尺寸发生变化
function sizeChange(newValue, oldValue, ownerInstance, instance) {
// wxs内的局部变量快照
var state = instance.getState()
// 临时防止nv_disabled报错
if (!state || !newValue) {
return;
}
state.disabled = newValue.disabled
state.duration = newValue.duration
state.show = newValue.show
state.threshold = newValue.threshold
state.buttons = newValue.buttons
if (state.buttons) {
var len = state.buttons.length
var buttonsWidth = 0
var buttons = newValue.buttons
for (var i = 0; i < len; i++) {
buttonsWidth += buttons[i].width
}
}
state.buttonsWidth = buttonsWidth
}
export default {
touchstart: touchstart,
touchmove: touchmove,
touchend: touchend,
sizeChange: sizeChange,
statusChange: statusChange
}