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uturn-public.js
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uturn-public.js
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(function(TNY, document, undefined){
function uturn () {
var _scrollY,
_countingUp = 0,
_countingDown = 0,
_onionSkin = [],
_lastScrollY = 0,
_container = document.querySelector('#articleBody'), // Change this to the element you want to watch
_ticking = false,
scrollChangeToUp = new CustomEvent("scrollChangeToUp", {}),
scrollChangeToDown = new CustomEvent("scrollChangeToDown", {});
insideContent = new CustomEvent("scrollInsideContent", {});
outsideContent = new CustomEvent("scrollOutsideContent", {});
events();
/**
* Callback for our scroll event - just
* keeps a track on the last scroll value
*/
function onScroll() {
_lastScrollY = window.scrollY;
requestTick();
}
/**
* Calls rAF if it's not already
* been done already
*/
function requestTick() {
if(!_ticking) {
requestAnimFrame(update);
_ticking = true;
}
}
/**
* Our animation callback
*/
function update() {
updateLocation();
// allow further rAFs to be called
_ticking = false;
}
/**
* Scroll related event setup
*/
function events(remove){
var op = remove ? 'remove' : 'add';
// only listen for scroll events
window.addEventListener('scroll', onScroll, false);
// shim layer with setTimeout fallback
window.requestAnimFrame = (function(){
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function( callback ){
window.setTimeout(callback, 1000 / 60);
};
})();
}
/**
* Do a check if scrolling up
* Expand check by confirmed the scrolling up is actually happening
*/
function checkIsScrollingUp(y){
var bounds = _container.getBoundingClientRect(),
isGoingUp;
if(bounds.top < 0 && (bounds.top+bounds.height-window.innerHeight) > 0){
if(_scrollY > y){
document.dispatchEvent(scrollChangeToUp);
} else {
document.dispatchEvent(scrollChangeToDown);
}
if(document.querySelector('#articleBody').offsetHeight > window.scrollY + window.innerHeight){
document.dispatchEvent(insideContent);
}
} else {
document.dispatchEvent(outsideContent);
document.dispatchEvent(scrollChangeToDown);
}
}
/**
* This is the "controller" for this entire process
*/
var updateLocation = function(){
// console.log('fn running');
var y = window.scrollY;
checkIsScrollingUp(y);
_scrollY = y;
};
}
TNY.uturn = uturn;
})(TNY, document);
jQuery(document).ready(function(){
if(jQuery('#main').hasClass('single-article') || jQuery('#main').hasClass('single-post')){
if(jQuery('#articleBody').height() > 1000 && jQuery(window).width() > 650){
TNY.uturn();
}
}
});