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/**
* Often used vanilla js functions, so that we don't need
* to use all of underscore/jQuery
*/
(function( undefined ) {
"use strict";
var v = ( window.VAMTAM = window.VAMTAM || {} ); // Namespace
// Returns a function, that, as long as it continues to be invoked, will not
// be triggered. The function will be called after it stops being called for
// N milliseconds. If `immediate` is passed, trigger the function on the
// leading edge, instead of the trailing.
v.debounce = function( func, wait, immediate ) {
var timeout;
return function() {
var context = this, args = arguments;
var later = function() {
timeout = null;
if ( ! immediate ) func.apply( context, args );
};
var callNow = immediate && ! timeout;
clearTimeout( timeout );
timeout = setTimeout( later, wait );
if ( callNow ) func.apply( context, args );
};
};
if ( 'jQuery' in window && ! ( 'debounce' in window.jQuery ) ) {
window.jQuery.debounce = function( delay, at_begin, callback ) {
return callback === undefined ?
v.debounce( at_begin, delay, false )
: v.debounce( callback, delay, at_begin !== false );
};
}
// vanilla jQuery.fn.offset() replacement
// @see https://plainjs.com/javascript/styles/get-the-position-of-an-element-relative-to-the-document-24/
v.offset = function( el ) {
var rect = el.getBoundingClientRect(),
scrollLeft = window.pageXOffset || document.documentElement.scrollLeft,
scrollTop = window.pageYOffset || document.documentElement.scrollTop;
return { top: rect.top + scrollTop, left: rect.left + scrollLeft };
};
// Faster scroll-based animations
v.scroll_handlers = [];
v.latestKnownScrollY = 0;
var ticking = false;
v.addScrollHandler = function( handler ) {
requestAnimationFrame( function() {
handler.init();
v.scroll_handlers.push( handler );
handler.measure( v.latestKnownScrollY );
handler.mutate( v.latestKnownScrollY );
} );
};
v.onScroll = function() {
v.latestKnownScrollY = window.pageYOffset;
if ( ! ticking ) {
ticking = true;
requestAnimationFrame( function() {
var i;
for ( i = 0; i < v.scroll_handlers.length; i++ ) {
v.scroll_handlers[i].measure( v.latestKnownScrollY );
}
for ( i = 0; i < v.scroll_handlers.length; i++ ) {
v.scroll_handlers[i].mutate( v.latestKnownScrollY );
}
ticking = false;
} );
}
};
window.addEventListener( 'scroll', v.onScroll, { passive: true } );
// Load an async script
v.load_script = function( src, callback ) {
var s = document.createElement('script');
s.type = 'text/javascript';
s.async = true;
s.src = src;
if ( callback ) {
s.onload = callback;
}
document.getElementsByTagName('script')[0].before( s );
};
v.load_style = function( href, media, callback, after ) {
var l = document.createElement('link');
l.rel = 'stylesheet';
l.type = 'text/css';
l.media = media;
l.href = href;
if ( callback ) {
l.onload = callback;
}
if ( after ) {
after.after( l );
} else {
document.getElementsByTagName('link')[0].before( l );
}
};
})();