/**
* 处理 移动设备上的 点击、长按、左右上下滑动 事件
*
* =========================================
* 导出了7个自定义指令：
* v-tap： tap点击事件
* v-swipe： swipe滑动事件
* v-swipeleft： swipeleft左滑事件
* v-swiperight： swiperight右滑事件
* v-swipedown： swipedown下滑
* v-swipeup： swipeup上滑
* v-longtap： longtap长按
* =========================================
*
* =========================================
* 包含四个参数
* stop 阻止冒泡
* prevent 阻止默认事件
* self 只当在 event.target 是当前元素自身时触发处理函数
* once 执行一次后解绑
*
* @example v-tap.stop.prevent.self.once
* =========================================
*
* =========================================
* 事件绑定有两种方式
* @example
* 1. v-tap="showDialog" 绑定一个方法对象
* 2. v-tap="{fn:click123, param1:1, param2:2, param3:{aaa:'123'} ...}"
* 绑定一个JSON字面量，fn是执行的方法，后边的是需要传递的参数
* 事件回调参数
* @param 第一个参数是event，事件对象
* @param 第二个参数是 binding.value，也就是v-tap=""双引号中的部分（如示例2，第二个参数就是 {fn:click123, param1:1, param2:2, param3:{aaa:'123'} ...}）
* =========================================
*
* @update
* 1. 根据MUI进行了滑动事件的判断修正
* 2. 根据TouchEvent修正了点击位置的判断
*
*/
import Vue from "vue"
/**
* vue上点击事件处理类
*/
class VueTouch {
constructor(el, binding, type) {
let g = this
g.obj = el
g.binding = binding
g.touchType = type
g.firstTouchPosition = { x: 0, y: 0 }
g.firstTouchTime = 0
g.callBack = typeof binding.value === "object" ? binding.value.fn : binding.value
g.moved = false
g.leaved = false
g.longTouched = false
// 事件监听回调集合
let _listener = Object.create(null)
// 事件方法
let _listen = type => {
return function(e) {
let { stop, prevent, self, once } = g.binding.modifiers
// 配置判断
if (stop) e.stopPropagation()
if (prevent) e.preventDefault()
if (once) g.obj.removeEventListener("touch" + type, _listener[type])
if (self && e.target !== e.currentTarget) return
g[type](e)
}
}
_listener.start = _listen("start")
_listener.end = _listen("end")
_listener.move = _listen("move")
this.obj.addEventListener("touchstart", _listener.start, false)
this.obj.addEventListener("touchend", _listener.end, false)
this.obj.addEventListener("touchmove", _listener.move, false)
}
start(e) {
let g = this
// 初始化点击状态
g.moved = false
g.leaved = false
g.longTouched = false
g.firstTouchPosition = g.getMultiCenter(e.changedTouches)
g.firstTouchTime = e.timeStamp
g.currentTarget = e.currentTarget
g.time = setTimeout(
function() {
if (!g.leaved && !g.moved) {
g.touchType === "longtap" && g.callBack(e, g.firstTouchPosition, g.binding.value, g.currentTarget)
g.longTouched = true
}
}.bind(g),
700
)
}
end(e) {
let g = this
let { x, y } = g.getMultiCenter(e.changedTouches)
let _disX = x - g.firstTouchPosition.x
let _disY = y - g.firstTouchPosition.y
let _dis = Math.sqrt(_disX * _disX + _disY * _disY)
let _timeDis = e.timeStamp - g.firstTouchTime
clearTimeout(g.time)
let _angle = this.getAngle(_disX, _disY)
if (_dis > 18 && _timeDis < 300) {
g.touchType === "swipe" && g.callBack(e, g.binding.value)
if (_angle >= 60 && _angle <= 120) g.touchType === "swipedown" && g.callBack(e, g.binding.value)
if (_angle <= -60 && _angle >= -120) g.touchType === "swipeup" && g.callBack(e, g.binding.value)
if (_angle <= 20 && _angle >= -20) g.touchType === "swipeleft" && g.callBack(e, g.binding.value)
if ((_angle <= -160 && _angle > -180) || (_angle >= 160 && _angle <= 180)) g.touchType === "swiperight" && g.callBack(e, g.binding.value)
} else {
if (!g.longTouched && !g.moved) {
g.touchType === "tap" && g.callBack(e, g.binding.value)
g.leaved = true
}
}
}
move(e) {
this.moved = true
let { x, y } = this.getMultiCenter(e.changedTouches)
let _disX = x - this.firstTouchPosition.x
let _disY = y - this.firstTouchPosition.y
let _dis = Math.sqrt(_disX * _disX + _disY * _disY)
if (_dis <= 2) {
this.moved = false
}
}
/**
* 获取点击集合的中心坐标
* @param touches touch对象集合
* @return {{x: number, y: number}}
*/
getMultiCenter(touches) {
let g = this,
x = 0,
y = 0
const _length = touches.length
for (let i = 0; i < _length; i++) {
x += touches[i].pageX
y += touches[i].pageY
}
return {
x: Math.round(x / _length),
y: Math.round(y / _length)
}
}
getAngle(disX, disY) {
let g = this
if (typeof disX !== "number" || typeof disY !== "number") return 45
return (Math.atan2(disY, disX) * 180) / Math.PI
}
}
Vue.directive("tap", {
bind: function(el, binding) {
new VueTouch(el, binding, "tap")
}
})
Vue.directive("swipe", {
bind: function(el, binding) {
new VueTouch(el, binding, "swipe")
}
})
Vue.directive("swipeleft", {
bind: function(el, binding) {
new VueTouch(el, binding, "swipeleft")
}
})
Vue.directive("swiperight", {
bind: function(el, binding) {
new VueTouch(el, binding, "swiperight")
}
})
Vue.directive("swipedown", {
bind: function(el, binding) {
new VueTouch(el, binding, "swipedown")
}
})
Vue.directive("swipeup", {
bind: function(el, binding) {
new VueTouch(el, binding, "swipeup")
}
})
Vue.directive("longtap", {
bind: function(el, binding) {
new VueTouch(el, binding, "longtap")
}
})
