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var Scroller = (function(){
var Scroller = {}
var prev, next, left, right, burger
var webkitRatio = 1
Scroller.init = function(opt){
previous = opt.previous
next = opt.next
burger = opt.burger
left = opt.left
right = opt.right
if (is_mobile) {
document.body.addEventListener("touchstart", touchstart)
document.body.addEventListener("touchmove", touchmove)
document.body.addEventListener("touchend", touchend)
}
else {
document.body.addEventListener("wheel", wheelDelta)
document.body.addEventListener("keydown", keydown)
}
}
var touching = false, touchStartTime
var touchStartY, touchEndY, touchDistY, touchAbsY
var touchStartX, touchEndX, touchDistX, touchAbsX
var touchAdvanceDistance = 60
var touchFadeDistance = 60
var touchGalleryScrubDistance = 100
var $items = $("#items")[0]
function touchstart (e) {
// console.log(e.target, e.currentTarget)
if (document.body.classList.contains("navopen")) return
if (e.target.className == "index" || e.target.id == "burger") return
if (e.target.nodeName == "rect" || e.target.nodeName == "g") return
touching = true
touchStartTime = +(new Date)
touchStartY = touchEndY = e.touches ? e.touches[0].pageY : e.pageY
touchStartX = touchEndX = e.touches ? e.touches[0].pageX : e.pageX
touchDistY = touchDistX = 0
}
function touchmove (e) {
if (! touching) return
e.preventDefault()
var timestamp = +(new Date)
var duration = timestamp - touchStartTime
touchEndY = e.touches ? e.touches[0].pageY : e.pageY
touchEndX = e.touches ? e.touches[0].pageX : e.pageX
touchDistY = touchStartY - touchEndY
touchDistX = touchStartX - touchEndX
touchAbsY = Math.abs(touchDistY)
touchAbsX = Math.abs(touchDistX)
if (touchAbsY > touchAdvanceDistance && touchAbsX < touchGalleryScrubDistance) {
touchend(e)
}
}
function touchend (e) {
if (! touching) return
e.preventDefault()
touching = false
var timestamp = +(new Date)
var duration = timestamp - touchStartTime
// console.log("DURATION >>", duration, touchDistY, touchDistX)
if (touchAbsX > touchGalleryScrubDistance) {
return
}
if ( (duration < 120 && touchAbsY < 10) || touchAbsY >= touchAdvanceDistance) {
touchDistY > 0 ? step(1) : step(-1)
}
// $items.className = ""
// setTimeout(function(){
// $items.style[transformProp] = "translateZ(0) translateY(0)"
// if (Math.abs(touchDist) >= touchAdvanceDistance) {
// $items.style.opacity = 0
// setTimeout(function(){
// $items.style.opacity = 1
// }, 200)
// }
// else {
// $items.style.opacity = 1
// }
// }, 0)
}
function wheelDelta (e){
e.preventDefault()
var deltaY = 0
// WebKit
if ( e.deltaY ) {
deltaY += e.deltaY * webkitRatio
}
else if ( e.wheelDeltaY ) {
deltaY += e.wheelDeltaY * webkitRatio
}
// Opera / Explorer 9
else if ( e.wheelDelta ) {
deltaY += e.wheelDelta * webkitRatio
}
// Firefox
else if ( e.detail ) {
deltaY -= e.detail * 2
}
wheel(deltaY)
}
var lastScrollEvent = +new Date(), lastDY = 0, lastSign = 0
function wheel (dy) {
if (isNaN(dy)) return
var now = +new Date(), newSign = sign(dy)
if ((now > lastScrollEvent + 300) ||
(lastSign !== newSign && Math.abs(dy) > Math.abs(lastDY*2)) ||
(lastSign === newSign && Math.log(Math.abs(dy)) > 1+Math.log(Math.abs(lastDY)))) {
step(sign(dy))
}
lastDY = dy
lastSign = newSign
lastScrollEvent = now
}
function step (n) {
var now = +new Date()
if (now < lastScrollEvent + 300) {
return
}
lastScrollEvent = now
if (n < 0) {
previous()
}
else {
next()
}
}
function keydown (e) {
// console.log(e.keyCode)
switch (e.keyCode) {
case 37: // left
e.preventDefault()
left()
break
case 39: // right
e.preventDefault()
right()
break
case 27: // esc
e.preventDefault()
burger()
break
case 32: // space
e.preventDefault()
step(1)
break
case 36: // home
e.preventDefault()
break
case 35: // end
e.preventDefault()
break
case 33: // page up
case 38: // up
e.preventDefault()
step(-1)
break
case 34: // page down
case 40: // down
e.preventDefault()
step(1)
break
}
}
return Scroller
})()
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