/**
 * jQuery.ScrollTo
 * Copyright (c) 2007-2009 Ariel Flesler - aflesler(at)gmail(dot)com | http://flesler.blogspot.com
 * Dual licensed under MIT and GPL.
 * Date: 5/25/2009
 *
 * @projectDescription Easy element scrolling using jQuery.
 * http://flesler.blogspot.com/2007/10/jqueryscrollto.html
 * Works with jQuery +1.2.6. Tested on FF 2/3, IE 6/7/8, Opera 9.5/6, Safari 3, Chrome 1 on WinXP.
 *
 * @author Ariel Flesler
 * @version 1.4.2
 *
 * @id jQuery.scrollTo
 * @id jQuery.fn.scrollTo
 * @param {String, Number, DOMElement, jQuery, Object} target Where to scroll the matched elements.
 *	  The different options for target are:
 *		- A number position (will be applied to all axes).
 *		- A string position ('44', '100px', '+=90', etc ) will be applied to all axes
 *		- A jQuery/DOM element ( logically, child of the element to scroll )
 *		- A string selector, that will be relative to the element to scroll ( 'li:eq(2)', etc )
 *		- A hash { top:x, left:y }, x and y can be any kind of number/string like above.
*		- A percentage of the container's dimension/s, for example: 50% to go to the middle.
 *		- The string 'max' for go-to-end. 
 * @param {Number} duration The OVERALL length of the animation, this argument can be the settings object instead.
 * @param {Object,Function} settings Optional set of settings or the onAfter callback.
 *	 @option {String} axis Which axis must be scrolled, use 'x', 'y', 'xy' or 'yx'.
 *	 @option {Number} duration The OVERALL length of the animation.
 *	 @option {String} easing The easing method for the animation.
 *	 @option {Boolean} margin If true, the margin of the target element will be deducted from the final position.
 *	 @option {Object, Number} offset Add/deduct from the end position. One number for both axes or { top:x, left:y }.
 *	 @option {Object, Number} over Add/deduct the height/width multiplied by 'over', can be { top:x, left:y } when using both axes.
 *	 @option {Boolean} queue If true, and both axis are given, the 2nd axis will only be animated after the first one ends.
 *	 @option {Function} onAfter Function to be called after the scrolling ends. 
 *	 @option {Function} onAfterFirst If queuing is activated, this function will be called after the first scrolling ends.
 * @return {jQuery} Returns the same jQuery object, for chaining.
 *
 * @desc Scroll to a fixed position
 * @example $('div').scrollTo( 340 );
 *
 * @desc Scroll relatively to the actual position
 * @example $('div').scrollTo( '+=340px', { axis:'y' } );
 *
 * @dec Scroll using a selector (relative to the scrolled element)
 * @example $('div').scrollTo( 'p.paragraph:eq(2)', 500, { easing:'swing', queue:true, axis:'xy' } );
 *
 * @ Scroll to a DOM element (same for jQuery object)
 * @example var second_child = document.getElementById('container').firstChild.nextSibling;
 *			$('#container').scrollTo( second_child, { duration:500, axis:'x', onAfter:function(){
 *				alert('scrolled!!');																   
 *			}});
 *
 * @desc Scroll on both axes, to different values
 * @example $('div').scrollTo( { top: 300, left:'+=200' }, { axis:'xy', offset:-20 } );
 */
;(function( $ ){
	
	var $scrollTo = $.scrollTo = function( target, duration, settings ){
		$(window).scrollTo( target, duration, settings );
	};

	$scrollTo.defaults = {
		axis:'xy',
		duration: parseFloat($.fn.jquery) >= 1.3 ? 0 : 1
	};

	// Returns the element that needs to be animated to scroll the window.
	// Kept for backwards compatibility (specially for localScroll & serialScroll)
	$scrollTo.window = function( scope ){
		return $(window)._scrollable();
	};

	// Hack, hack, hack :)
	// Returns the real elements to scroll (supports window/iframes, documents and regular nodes)
	$.fn._scrollable = function(){
		return this.map(function(){
			var elem = this,
				isWin = !elem.nodeName || $.inArray( elem.nodeName.toLowerCase(), ['iframe','#document','html','body'] ) != -1;

				if( !isWin )
					return elem;

			var doc = (elem.contentWindow || elem).document || elem.ownerDocument || elem;
			
			return $.browser.safari || doc.compatMode == 'BackCompat' ?
				doc.body : 
				doc.documentElement;
		});
	};

	$.fn.scrollTo = function( target, duration, settings ){
		if( typeof duration == 'object' ){
			settings = duration;
			duration = 0;
		}
		if( typeof settings == 'function' )
			settings = { onAfter:settings };
			
		if( target == 'max' )
			target = 9e9;
			
		settings = $.extend( {}, $scrollTo.defaults, settings );
		// Speed is still recognized for backwards compatibility
		duration = duration || settings.speed || settings.duration;
		// Make sure the settings are given right
		settings.queue = settings.queue && settings.axis.length > 1;
		
		if( settings.queue )
			// Let's keep the overall duration
			duration /= 2;
		settings.offset = both( settings.offset );
		settings.over = both( settings.over );

		return this._scrollable().each(function(){
			var elem = this,
				$elem = $(elem),
				targ = target, toff, attr = {},
				win = $elem.is('html,body');

			switch( typeof targ ){
				// A number will pass the regex
				case 'number':
				case 'string':
					if( /^([+-]=)?\d+(\.\d+)?(px|%)?$/.test(targ) ){
						targ = both( targ );
						// We are done
						break;
					}
					// Relative selector, no break!
					targ = $(targ,this);
				case 'object':
					// DOMElement / jQuery
					if( targ.is || targ.style )
						// Get the real position of the target 
						toff = (targ = $(targ)).offset();
			}
			$.each( settings.axis.split(''), function( i, axis ){
				var Pos	= axis == 'x' ? 'Left' : 'Top',
					pos = Pos.toLowerCase(),
					key = 'scroll' + Pos,
					old = elem[key],
					max = $scrollTo.max(elem, axis);

				if( toff ){// jQuery / DOMElement
					attr[key] = toff[pos] + ( win ? 0 : old - $elem.offset()[pos] );

					// If it's a dom element, reduce the margin
					if( settings.margin ){
						attr[key] -= parseInt(targ.css('margin'+Pos)) || 0;
						attr[key] -= parseInt(targ.css('border'+Pos+'Width')) || 0;
					}
					
					attr[key] += settings.offset[pos] || 0;
					
					if( settings.over[pos] )
						// Scroll to a fraction of its width/height
						attr[key] += targ[axis=='x'?'width':'height']() * settings.over[pos];
				}else{ 
					var val = targ[pos];
					// Handle percentage values
					attr[key] = val.slice && val.slice(-1) == '%' ? 
						parseFloat(val) / 100 * max
						: val;
				}

				// Number or 'number'
				if( /^\d+$/.test(attr[key]) )
					// Check the limits
					attr[key] = attr[key] <= 0 ? 0 : Math.min( attr[key], max );

				// Queueing axes
				if( !i && settings.queue ){
					// Don't waste time animating, if there's no need.
					if( old != attr[key] )
						// Intermediate animation
						animate( settings.onAfterFirst );
					// Don't animate this axis again in the next iteration.
					delete attr[key];
				}
			});

			animate( settings.onAfter );			

			function animate( callback ){
				$elem.animate( attr, duration, settings.easing, callback && function(){
					callback.call(this, target, settings);
				});
			};

		}).end();
	};
	
	// Max scrolling position, works on quirks mode
	// It only fails (not too badly) on IE, quirks mode.
	$scrollTo.max = function( elem, axis ){
		var Dim = axis == 'x' ? 'Width' : 'Height',
			scroll = 'scroll'+Dim;
		
		if( !$(elem).is('html,body') )
			return elem[scroll] - $(elem)[Dim.toLowerCase()]();
		
		var size = 'client' + Dim,
			html = elem.ownerDocument.documentElement,
			body = elem.ownerDocument.body;

		return Math.max( html[scroll], body[scroll] ) 
			 - Math.min( html[size]  , body[size]   );
			
	};

	function both( val ){
		return typeof val == 'object' ? val : { top:val, left:val };
	};

})( jQuery );
jQuery(function( $ ){
	/**
	 * Demo binding and preparation, no need to read this part
	 */
	//borrowed from jQuery easing plugin
	//http://gsgd.co.uk/sandbox/jquery.easing.php
	$.easing.elasout = function(x, t, b, c, d) {
		var s=1.70158;var p=0;var a=c;
		if (t==0) return b;  if ((t/=d)==1) return b+c;  if (!p) p=d*.3;
		if (a < Math.abs(c)) { a=c; var s=p/4; }
		else var s = p/(2*Math.PI) * Math.asin (c/a);
		return a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b;
	};
	// back links
	$('a.back').click(function(){
		$(this).parents('div.pane').scrollTo( 0, 800, { queue:true } );
		$(this).parents('div.section').find('span.message').text( this.title );
		return false;
	});
	//just for the example, to stop the click on the links.
	$('ul.links').click(function(e){
		e.preventDefault();
		var link = e.target;
		link.blur();
		if( link.title )
			$(this).parent().find('span.message').text(link.title);
	});
	
	// This one is important, many browsers don't reset scroll on refreshes
	// Reset all scrollable panes to (0,0)
	$('div.pane').scrollTo( 0 );
	// Reset the screen to (0,0)
	$.scrollTo( 0 );
	
	// TOC, shows how to scroll the whole window
	$('#toc a').click(function(){//$.scrollTo works EXACTLY the same way, but scrolls the whole screen
		$.scrollTo( this.hash, 1500, { easing:'elasout' });
		$(this.hash).find('span.message').text( this.title );
		return false;
	});
	
	// Target examples bindings
	// THIS DEMO IS NOT INTENDED TO SHOW HOW TO CODE IT
	// JUST THE MULTIPLE OPTIONS. THIS CODE IS UGLY.
	var $paneTarget = $('#pane-target');
	
	$('#relative-selector').click(function(){
		$paneTarget.stop().scrollTo( 'li:eq(14)', 800 );
	});
	$('#jquery-object').click(function(){
		var $target = $paneTarget.find('li:eq(14)');
		$paneTarget.stop().scrollTo( $target , 800 );
	});
	$('#dom-element').click(function(){
		var target = $paneTarget.find('ul').get(0).childNodes[20];
		$paneTarget.stop().scrollTo( target, 800 );
	});
	$('#absolute-number').click(function(){
		$paneTarget.stop().scrollTo( 150, 800 );
	});
	$('#absolute-number-hash').click(function(){
		$paneTarget.stop().scrollTo( { top:800,left:700} , 800 );
	});
	$('#absolute-position').click(function(){
		$paneTarget.stop().scrollTo( '520px', 800 );
	});
	$('#absolute-position-hash').click(function(){
		$paneTarget.stop().scrollTo( {top:'110px',left:'290px'}, 800 );
	});
	$('#relative-position').click(function(){
		$paneTarget.stop().scrollTo( '+=100', 500 );
	});
	$('#relative-position-hash').click(function(){				
		$paneTarget.stop().scrollTo( {top:'-=100px',left:'+=100'}, 500 );
	});
	
	$('#percentage-position').click(function(){				
		$paneTarget.stop().scrollTo( '50%', 800 );
	});
	
	// Options examples bindings, they will all scroll to the same place, with different options
	function reset_o(){//before each animation, reset to (0,0), skip this.
		$paneOptions.stop(true).attr({scrollLeft:0, scrollTop:0});
	};
	var $paneOptions = $('#pane-options');
	
	$('#options-no').click(function(){
		reset_o(); $paneOptions.scrollTo( 'li:eq(15)', 1000 );
	});
	$('#options-axis').click(function(){// only scroll horizontally
		reset_o(); $paneOptions.scrollTo( 'li:eq(15)', 1000, { axis:'x' } );
	});
	$('#options-duration').click(function(){// it's the same as specifying it in the 2nd argument
		reset_o(); $paneOptions.scrollTo( 'li:eq(15)', { duration: 3000 } );
	});
	$('#options-easing').click(function(){
		reset_o(); $paneOptions.scrollTo( 'li:eq(15)', 2500, { easing:'elasout' } );
	});
	$('#options-margin').click(function(){//scroll to the "outer" position of the element
		reset_o(); $paneOptions.scrollTo( 'li:eq(15)', 1000, { margin:true } );
	});
	$('#options-offset').click(function(){//same as { top:-50, left:-50 }
		reset_o(); $paneOptions.scrollTo( 'li:eq(15)', 1000, { offset:-50 } );
	});
	$('#options-offset-hash').click(function(){
		reset_o(); $paneOptions.scrollTo( 'li:eq(15)', 1000, { offset:{ top:-5,left:-30 } });
	});
	$('#options-over').click(function(){//same as { top:-50, left:-50 }
		reset_o(); $paneOptions.scrollTo( 'li:eq(15)', 1000, { over:0.5 });
	});
	$('#options-over-hash').click(function(){
		reset_o(); $paneOptions.scrollTo( 'li:eq(15)', 1000, { over:{ top:0.2, left:-0.5 } });
	});
	$('#options-queue').click(function(){//in this case, having 'axis' as 'xy' or 'yx' matters.
		reset_o(); $paneOptions.scrollTo( 'li:eq(15)', 2000, { queue:true });
	});
	$('#options-onAfter').click(function(){
		reset_o(); $paneOptions.scrollTo( 'li:eq(15)', 2000, { 
			onAfter:function(){
				$('#options-message').text('Got there!');
			}
		});
	});
	// onAfterFirst exists only when queuing
	$('#options-onAfterFirst').click(function(){
		reset_o(); $paneOptions.scrollTo( 'li:eq(15)', 1600, { 
			queue:true,
			onAfterFirst:function(){
				$('#options-message').text('Got there horizontally!');
			},
			onAfter:function(){
				$('#options-message').text('Got there vertically!');
			}
		});
	});
});