https://www.metzger-maurer.de/scripts/animation/scrolling.js

1"use strict"; var $ = jQuery;
2module.exports = function(script){
3	var me = this;
4	var tools = require('../tools/tools.js');
5	var ScrollAnimation = require('../app/scroll-animation.js');
6	var $window = $(window);
7	var isPoorBrowser = $('html').hasClass('poor-browser');
8	var scrollAnimation = new ScrollAnimation(me, script);
9	this.windowTopPos = undefined;
10	this.windowBottomPos = undefined;
11	this.windowH = undefined;
12	this.scroll = function(windowTopP){
13		me.windowH = $window.height();
14		me.windowTopPos = windowTopP
15		me.windowBottomPos = windowTopP+me.windowH;
16		if(me.windowTopPos < script.topNav.state1Top()){
17			script.topNav.state1();
18		}else{
19			script.topNav.state2();
20		}
21		scrollAnimation.scroll()
22		for(var i=0; i<script.players.length; i++){
23			var viewPos = me.calcPosition(script.players[i].$view);
24			if(viewPos.visible){
25				script.players[i].play();
26			}else{
27				script.players[i].pause();
28			}
29		}
30	}
31	this.calcPosition = function ($block){
32		var blockH = $block.height();
33		var blockTopPos = $block.data('position');
34		var blockBottomPos = blockTopPos + blockH;
35		return {
36			top: blockTopPos,
37			bottom: blockBottomPos,
38			height: blockH,
39			visible: blockTopPos<me.windowBottomPos && blockBottomPos>me.windowTopPos
40		};
41	}
42};