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150 | 1×
| const IS_TOUCH = window !== undefined && (('ontouchstart' in window) || window.DocumentTouch && document instanceof window.DocumentTouch)
export default class Drag {
constructor (element) {
this.el = element
this.startPos = {}
this.endPos = {}
this.starts = []
this.drags = []
this.ends = []
if (IS_TOUCH) {
this.el.addEventListener('touchstart', this, false)
} else {
this.el.addEventListener('mousedown', this, false)
}
}
handleEvent (event) {
switch (event.type) {
case 'touchstart':
this.touchStart(event)
break
case 'touchmove':
this.touchMove(event)
break
case 'touchcancel':
case 'touchend':
this.touchEnd(event)
break
case 'mousedown':
this.mouseStart(event)
break
case 'mousemove':
this.mouseMove(event)
break
case 'mouseleave':
case 'mouseup':
this.mouseEnd(event)
break
}
}
touchStart (event) {
let touch = event.touches[0]
this.startPos = { // 取第一个touch的坐标值
x: touch.pageX,
y: touch.pageY,
time: new Date().getTime()
}
this.endPos = {}
this.el.addEventListener('touchmove', this, false)
this.el.addEventListener('touchend', this, false)
this.starts.map((func) => {
func.call(this, this.startPos, event)
})
}
touchMove (event) {
if (event.touches.length > 1 || event.scale && event.scale !== 1) return
let touch = event.touches[0]
this.endPos = {
x: touch.pageX - this.startPos.x,
y: touch.pageY - this.startPos.y,
time: new Date().getTime() - this.startPos.time
}
this.drags.map((func) => {
func.call(this, this.endPos, event)
})
}
touchEnd (event) {
this.endPos.time = new Date().getTime() - this.startPos.time
this.el.removeEventListener('touchmove', this, false)
this.el.removeEventListener('touchend', this, false)
this.ends.map((func) => {
func.call(this, this.endPos, event)
})
}
mouseStart (event) {
this.startPos = {
x: event.clientX,
y: event.clientY,
time: new Date().getTime()
}
this.endPos = {}
this.el.addEventListener('mousemove', this, false)
this.el.addEventListener('mouseup', this, false)
this.starts.map((func) => {
func.call(this, this.startPos, event)
})
}
mouseMove (event) {
this.endPos = {
x: event.clientX - this.startPos.x,
y: event.clientY - this.startPos.y
}
this.drags.map((func) => {
func.call(this, this.endPos, event)
})
}
mouseEnd (event) {
this.el.removeEventListener('mousemove', this, false)
this.el.removeEventListener('mouseup', this, false)
this.endPos.time = new Date().getTime() - this.startPos.time
this.ends.map((func) => {
func.call(this, this.endPos, event)
})
}
start (fun) {
this.starts.push(fun)
return this
}
end (fun) {
this.ends.push(fun)
return this
}
drag (fun) {
this.drags.push(fun)
return this
}
reset (event) {
let touch = event.touches ? event.touches[0] : {}
this.startPos = { // 取第一个touch的坐标值
x: touch.pageX || event.clientX,
y: touch.pageY || event.clientY,
time: new Date().getTime()
}
this.endPos = {
x: 0,
y: 0
}
}
destory () {
if (IS_TOUCH) {
this.el.removeEventListener('touchstart', this, false)
} else {
this.el.removeEventListener('mousedown', this, false)
}
}
}
|