mouse-wheel.js
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import { addEvent, removeEvent } from '../util/dom'
import { ease } from '../util/ease'
export function mouseWheelMixin(BScroll) {
BScroll.prototype._initMouseWheel = function () {
this._handleMouseWheelEvent(addEvent)
this.on('destroy', () => {
clearTimeout(this.mouseWheelTimer)
clearTimeout(this.mouseWheelEndTimer)
this._handleMouseWheelEvent(removeEvent)
})
this.firstWheelOpreation = true
}
BScroll.prototype._handleMouseWheelEvent = function (eventOperation) {
eventOperation(this.wrapper, 'wheel', this)
eventOperation(this.wrapper, 'mousewheel', this)
eventOperation(this.wrapper, 'DOMMouseScroll', this)
}
BScroll.prototype._onMouseWheel = function (e) {
if (!this.enabled) {
return
}
e.preventDefault()
if (this.options.stopPropagation) {
e.stopPropagation()
}
if (this.firstWheelOpreation) {
this.trigger('scrollStart')
}
this.firstWheelOpreation = false
const {speed = 20, invert = false, easeTime = 300} = this.options.mouseWheel
clearTimeout(this.mouseWheelTimer)
this.mouseWheelTimer = setTimeout(() => {
if (!this.options.snap && !easeTime) {
this.trigger('scrollEnd', {
x: this.x,
y: this.y
})
}
this.firstWheelOpreation = true
}, 400)
let wheelDeltaX
let wheelDeltaY
switch (true) {
case 'deltaX' in e:
if (e.deltaMode === 1) {
wheelDeltaX = -e.deltaX * speed
wheelDeltaY = -e.deltaY * speed
} else {
wheelDeltaX = -e.deltaX
wheelDeltaY = -e.deltaY
}
break
case 'wheelDeltaX' in e:
wheelDeltaX = e.wheelDeltaX / 120 * speed
wheelDeltaY = e.wheelDeltaY / 120 * speed
break
case 'wheelDelta' in e:
wheelDeltaX = wheelDeltaY = e.wheelDelta / 120 * speed
break
case 'detail' in e:
wheelDeltaX = wheelDeltaY = -e.detail / 3 * speed
break
default:
return
}
let direction = invert ? -1 : 1
wheelDeltaX *= direction
wheelDeltaY *= direction
if (!this.hasVerticalScroll) {
wheelDeltaX = wheelDeltaY
wheelDeltaY = 0
}
let newX
let newY
if (this.options.snap) {
newX = this.currentPage.pageX
newY = this.currentPage.pageY
if (wheelDeltaX > 0) {
newX--
} else if (wheelDeltaX < 0) {
newX++
}
if (wheelDeltaY > 0) {
newY--
} else if (wheelDeltaY < 0) {
newY++
}
this._goToPage(newX, newY)
return
}
newX = this.x + Math.round(this.hasHorizontalScroll ? wheelDeltaX : 0)
newY = this.y + Math.round(this.hasVerticalScroll ? wheelDeltaY : 0)
this.movingDirectionX = this.directionX = wheelDeltaX > 0 ? -1 : wheelDeltaX < 0 ? 1 : 0
this.movingDirectionY = this.directionY = wheelDeltaY > 0 ? -1 : wheelDeltaY < 0 ? 1 : 0
if (newX > this.minScrollX) {
newX = this.minScrollX
} else if (newX < this.maxScrollX) {
newX = this.maxScrollX
}
if (newY > this.minScrollY) {
newY = this.minScrollY
} else if (newY < this.maxScrollY) {
newY = this.maxScrollY
}
const needTriggerEnd = this.y === newY
this.scrollTo(newX, newY, easeTime, ease.swipe)
this.trigger('scroll', {
x: this.x,
y: this.y
})
clearTimeout(this.mouseWheelEndTimer)
if (needTriggerEnd) {
this.mouseWheelEndTimer = setTimeout(() => {
this.trigger('scrollEnd', {
x: this.x,
y: this.y
})
}, easeTime)
}
}
}