/* Horizontal Tiny Scrolling - a smooth scrolling script for horizontal websites

(the brother of the vertical "Tiny Scrolling")

by Marco Rosella - http://lab.centralscrutinizer.it/the-tiny-scrollings



v0.8 - July 7, 2009



Follow "The Horizontal Way"!: http://www.thehorizontalway.com			

also on Facebook: http://www.facebook.com/pages/The-Horizontal-Way/91646807676?ref=share			

			

DONATE!!!!!!!!: http://www.thehorizontalway.com/donate

Thanks! :-D



This program is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2 of the License, or

(at your option) any later version.



This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.



You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA				

*/



window.onload = function() {

	HtinyScrolling.init(); scrollTips.init();

}



function gotoit(target){

	HtinyScrolling.scrollToIt(target);

}



var HtinyScrolling = {

	speed : 50,      //set here the scroll speed: when this value increase, the speed decrease. 

	maxStep: 150,	 //set here the "uniform motion" step for long distances

	brakeK: 3,		 //set here the coefficient of slowing down

	hash:null,		

	currentBlock:null,

	requestedX:0,

	init: function() {

		var lnks = document.getElementsByTagName('a');   

		for(var i = 0, lnk; lnk = lnks[i]; i++) {   

			if ((lnk.href && lnk.href.indexOf('#') != -1) &&  ( (lnk.pathname == location.pathname) ||

			('/'+lnk.pathname == location.pathname) ) && (lnk.search == location.search)) {  

			addEvent(lnk,'click',HtinyScrolling.initScroll,false);

			lnk.onclick=function(){return false;} // Safari

			}   

		}    

	},

	getTarget: function(target) {

		while(target.tagName.toLowerCase() != 'a')

			target = target.parentNode;

		return target;

	},

	getElementXpos: function(el){

		var x = 0;

		while(el.offsetParent){  

			x += el.offsetLeft;    

			el = el.offsetParent;

		}	return x;

	},		

	getScrollLeft: function(){

		if(document.all) return (document.documentElement.scrollLeft) ? document.documentElement.scrollLeft : document.body.scrollLeft;

		else return window.pageXOffset;   

	},	

	getWindowWidth: function(){

		if (window.innerWidth)	return window.innerWidth; 

		if(document.documentElement && document.documentElement.clientWidth) return document.documentElement.clientWidth;

	},

	getDocumentWidth: function(){

		if (document.width) return document.width;

		if(document.body.offsetWidth) return document.body.offsetWidth;

	},

	initScroll: function(e){

		var targ;  

		if (!e) var e = window.event;

		if (e.target) targ = e.target;

		else if (e.srcElement) targ = e.srcElement;  

		targ = HtinyScrolling.getTarget(targ);  //a fix by Skid X

		HtinyScrolling.hash = targ.href.substr(targ.href.indexOf('#')+1,targ.href.length); 

		HtinyScrolling.currentBlock = document.getElementById(HtinyScrolling.hash);   

		if(!HtinyScrolling.currentBlock) return;

		HtinyScrolling.requestedX = HtinyScrolling.getElementXpos(HtinyScrolling.currentBlock); 

		HtinyScrolling.scroll(targ); 

		return false;

	},

	scrollToIt: function(targ){ //thanks to Michael Ionita-Ganea

		target = document.getElementById(targ);

		HtinyScrolling.currentBlock = document.getElementById(targ);

		if(!HtinyScrolling.currentBlock) return;

		HtinyScrolling.requestedX = HtinyScrolling.getElementXpos(HtinyScrolling.currentBlock);

		HtinyScrolling.scroll(target);

		return false;

		

	}, 

	scroll: function(targ) {

		var left  = HtinyScrolling.getScrollLeft();

		if(HtinyScrolling.requestedX > left) { //a fix by Michael Ionita-Ganea

			var endDistance = Math.round((HtinyScrolling.getDocumentWidth() - (left + HtinyScrolling.getWindowWidth())) / HtinyScrolling.brakeK);

			endDistance = Math.min(Math.round((HtinyScrolling.requestedX-left)/ HtinyScrolling.brakeK), endDistance);

			var offset = Math.min(Math.abs(Math.round((HtinyScrolling.requestedX-left)/ HtinyScrolling.brakeK)), HtinyScrolling.maxStep);

		}else {

				var offset = - Math.min(Math.abs(Math.round((HtinyScrolling.requestedX-left)/ HtinyScrolling.brakeK)), HtinyScrolling.maxStep);

		} 

		window.scrollTo(left + offset, 0);

		if(Math.abs(left-HtinyScrolling.requestedX) <= 1 || HtinyScrolling.getScrollLeft() == left) {

			HtinyScrolling.hash = null;

		} else 	setTimeout(HtinyScrolling.scroll,HtinyScrolling.speed);

	}

}



 

var scrollTips = {

	dx : null,

	init : function() {	

		if (window.addEventListener) {

		window.addEventListener("DOMMouseScroll", this.mouseScroll, false);

		} else document.attachEvent("onmousewheel", this.mouseScroll); 

		var left = document.getElementById('left');

		addEvent(left,'mouseover', function() {this.dx=setInterval('scrollTips.arrowScroll(0)',100);return false;});

		addEvent(left,'mouseout', function() { clearInterval(this.dx); return false;});

		var right = document.getElementById('right');

		addEvent(right,'mouseover', function() {this.dx=setInterval('scrollTips.arrowScroll(1)',100);return false;});

		addEvent(right,'mouseout', function() { clearInterval(this.dx); return false;});

	},

	mouseScroll : function(e) {

		if (!e) var e = window.event;

		  var scroll = e.detail ? e.detail * 20 : e.wheelDelta / -20;

		if (scroll>=0 ){  

		window.scrollBy(80,0);

		} else  window.scrollBy(-80,0) ; 

	},	

	arrowScroll: function(val) {

		if(val==1) {

			window.scrollBy(70,0);

		} else {

			window.scrollBy(-70,0)

		}

	}

}





function addEvent( obj, type, fn ) {

	if (obj.addEventListener)

		obj.addEventListener( type, fn, false );

	else if (obj.attachEvent) {

		obj["e"+type+fn] = fn;

		obj[type+fn] = function() { obj["e"+type+fn]( window.event ); }

		obj.attachEvent( "on"+type, obj[type+fn] );

	}

}



function removeEvent( obj, type, fn ) {

	if (obj.removeEventListener)

		obj.removeEventListener( type, fn, false );

	else if (obj.detachEvent) {

		obj.detachEvent( "on"+type, obj[type+fn] );

		obj[type+fn] = null;

		obj["e"+type+fn] = null;

	}

}