/* Copyright (c) 2006 Kelvin Luck (kelvin AT kelvinluck DOT com || http://www.kelvinluck.com)
 * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php) 
 * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
 * 
 * See http://kelvinluck.com/assets/jquery/jScrollPane/
 * $Id: jScrollPane.js 205 2009-08-19 16:20:54Z gk-google@ninebynine.org $
 */

/**
 * Replace the vertical scroll bars on any matched elements with a fancy
 * styleable (via CSS) version. With JS disabled the elements will
 * gracefully degrade to the browsers own implementation of overflow:auto.
 * If the mousewheel plugin has been included on the page then the scrollable areas will also
 * respond to the mouse wheel.
 *
 * @example jQuery(".scroll-pane").jScrollPane();
 *
 * @name jScrollPane
 * @type jQuery
 * @param Object	settings	hash with options, described below.
 *								scrollbarWidth	-	The width of the generated scrollbar in pixels
 *								scrollbarMargin	-	The amount of space to leave on the side of the scrollbar in pixels
 *								wheelSpeed		-	The speed the pane will scroll in response to the mouse wheel in pixels
 *								showArrows		-	Whether to display arrows for the user to scroll with
 *								arrowSize		-	The height of the arrow buttons if showArrows=true
 *								animateTo		-	Whether to animate when calling scrollTo and scrollBy
 *								dragMinHeight	-	The minimum height to allow the drag bar to be
 *								dragMaxHeight	-	The maximum height to allow the drag bar to be
 *								animateInterval	-	The interval in milliseconds to update an animating scrollPane (default 100)
 *								animateStep		-	The amount to divide the remaining scroll distance by when animating (default 3)
 *								maintainPosition-	Whether you want the contents of the scroll pane to maintain it's position when you re-initialise it - so it doesn't scroll as you add more content (default true)
 *								tabIndex		-	The tabindex for this jScrollPane to control when it is tabbed to when navigating via keyboard (default 0)
 *								enableKeyboardNavigation - Whether to allow keyboard scrolling of this jScrollPane when it is focused (default true)
 *								animateToInternalLinks - Whether the move to an internal link (e.g. when it's focused by tabbing or by a hash change in the URL) should be animated or instant (default false)
 *								scrollbarOnLeft	-	Display the scrollbar on the left side?  (needs stylesheet changes, see examples.html)
 *								reinitialiseOnImageLoad - Whether the jScrollPane should automatically re-initialise itself when any contained images are loaded (default false)
 * @return jQuery
 * @cat Plugins/jScrollPane
 * @author Kelvin Luck (kelvin AT kelvinluck DOT com || http://www.kelvinluck.com)
 */

(function($) {

$.jScrollPane = {
	active : []
};
$.fn.jScrollPane = function(settings)
{
	settings = $.extend({}, $.fn.jScrollPane.defaults, settings);

	var rf = function() { return false; };
	
	return this.each(
		function()
		{
			var $this = $(this);
			// Switch the element's overflow to hidden to ensure we get the size of the element without the scrollbars [http://plugins.jquery.com/node/1208]
			$this.css('overflow', 'hidden');
			var paneEle = this;
			
			if ($(this).parent().is('.jScrollPaneContainer')) {
				var currentScrollPosition = settings.maintainPosition ? $this.position().top : 0;
				var $c = $(this).parent();
				var paneWidth = $c.innerWidth();
				var paneHeight = $c.outerHeight();
				var trackHeight = paneHeight;
				$('>.jScrollPaneTrack, >.jScrollArrowUp, >.jScrollArrowDown', $c).remove();
				$this.css({'top':0});
			} else {
				var currentScrollPosition = 0;
				this.originalPadding = $this.css('paddingTop') + ' ' + $this.css('paddingRight') + ' ' + $this.css('paddingBottom') + ' ' + $this.css('paddingLeft');
				this.originalSidePaddingTotal = (parseInt($this.css('paddingLeft')) || 0) + (parseInt($this.css('paddingRight')) || 0);
				var paneWidth = $this.innerWidth();
				var paneHeight = $this.innerHeight();
				var trackHeight = paneHeight;
				var $container = $('<div></div>')
					.attr({'className':'jScrollPaneContainer'})
					.css(
						{
							'height':paneHeight+'px', 
							'width':paneWidth+'px'
						}
					);
				if (settings.enableKeyboardNavigation) {
					$container.attr(
						'tabindex', 
						settings.tabIndex
					);
				}
				$this.wrap($container);
				// deal with text size changes (if the jquery.em plugin is included)
				// and re-initialise the scrollPane so the track maintains the
				// correct size
				$(document).bind(
					'emchange', 
					function(e, cur, prev)
					{
						$this.jScrollPane(settings);
					}
				);
				
			}
			
			if (settings.reinitialiseOnImageLoad) {
				// code inspired by jquery.onImagesLoad: http://plugins.jquery.com/project/onImagesLoad
				// except we re-initialise the scroll pane when each image loads so that the scroll pane is always up to size...
				// TODO: Do I even need to store it in $.data? Is a local variable here the same since I don't pass the reinitialiseOnImageLoad when I re-initialise?
				var $imagesToLoad = $.data(paneEle, 'jScrollPaneImagesToLoad') || $('img', $this);
				var loadedImages = [];
				
				if ($imagesToLoad.length) {
					$imagesToLoad.each(function(i, val)	{
						$(this).bind('load readystatechange', function() {
							if($.inArray(i, loadedImages) == -1){ //don't double count images
								loadedImages.push(val); //keep a record of images we've seen
								$imagesToLoad = $.grep($imagesToLoad, function(n, i) {
									return n != val;
								});
								$.data(paneEle, 'jScrollPaneImagesToLoad', $imagesToLoad);
								var s2 = $.extend(settings, {reinitialiseOnImageLoad:false});
								$this.jScrollPane(s2); // re-initialise
							}
						}).each(function(i, val) {
							if(this.complete || this.complete===undefined) { 
								//needed for potential cached images
								this.src = this.src; 
							} 
						});
					});
				};
			}

			var p = this.originalSidePaddingTotal;
			var realPaneWidth = paneWidth - settings.scrollbarWidth - settings.scrollbarMargin - p;

			var cssToApply = {
				'height':'auto',
				'width': realPaneWidth + 'px'
			}

			if(settings.scrollbarOnLeft) {
				cssToApply.paddingLeft = settings.scrollbarMargin + settings.scrollbarWidth + 'px';
			} else {
				cssToApply.paddingRight = settings.scrollbarMargin + 'px';
			}

			$this.css(cssToApply);

			var contentHeight = $this.outerHeight();
			var percentInView = paneHeight / contentHeight;

			if (percentInView < .99) {
				var $container = $this.parent();
				$container.append(
					$('<div></div>').attr({'className':'jScrollPaneTrack'}).css({'width':settings.scrollbarWidth+'px'}).append(
						$('<div></div>').attr({'className':'jScrollPaneDrag'}).css({'width':settings.scrollbarWidth+'px'}).append(
							$('<div></div>').attr({'className':'jScrollPaneDragTop'}).css({'width':settings.scrollbarWidth+'px'}),
							$('<div></div>').attr({'className':'jScrollPaneDragBottom'}).css({'width':settings.scrollbarWidth+'px'})
						)
					)
				);
				
				var $track = $('>.jScrollPaneTrack', $container);
				var $drag = $('>.jScrollPaneTrack .jScrollPaneDrag', $container);
				
				
				var currentArrowDirection;
				var currentArrowTimerArr = [];// Array is used to store timers since they can stack up when dealing with keyboard events. This ensures all timers are cleaned up in the end, preventing an acceleration bug.
				var currentArrowInc;
				var whileArrowButtonDown = function() 
				{
					if (currentArrowInc > 4 || currentArrowInc % 4 == 0) {
						positionDrag(dragPosition + currentArrowDirection * mouseWheelMultiplier);
					}
					currentArrowInc++;
				};

				if (settings.enableKeyboardNavigation) {
					$container.bind(
						'keydown.jscrollpane',
						function(e) 
						{
							switch (e.keyCode) {
								case 38: //up
									currentArrowDirection = -1;
									currentArrowInc = 0;
									whileArrowButtonDown();
									currentArrowTimerArr[currentArrowTimerArr.length] = setInterval(whileArrowButtonDown, 100);
									return false;
								case 40: //down
									currentArrowDirection = 1;
									currentArrowInc = 0;
									whileArrowButtonDown();
									currentArrowTimerArr[currentArrowTimerArr.length] = setInterval(whileArrowButtonDown, 100);
									return false;
								case 33: // page up
								case 34: // page down
									// TODO
									return false;
								default:
							}
						}
					).bind(
						'keyup.jscrollpane',
						function(e) 
						{
							if (e.keyCode == 38 || e.keyCode == 40) {
								for (var i = 0; i < currentArrowTimerArr.length; i++) {
									clearInterval(currentArrowTimerArr[i]);
								}
								return false;
							}
						}
					);
				}

				if (settings.showArrows) {
					
					var currentArrowButton;
					var currentArrowInterval;

					var onArrowMouseUp = function(event)
					{
						$('html').unbind('mouseup', onArrowMouseUp);
						currentArrowButton.removeClass('jScrollActiveArrowButton');
						clearInterval(currentArrowInterval);
					};
					var onArrowMouseDown = function() {
						$('html').bind('mouseup', onArrowMouseUp);
						currentArrowButton.addClass('jScrollActiveArrowButton');
						currentArrowInc = 0;
						whileArrowButtonDown();
						currentArrowInterval = setInterval(whileArrowButtonDown, 100);
					};
					$container
						.append(
							$('<a></a>')
								.attr({'href':'javascript:;', 'className':'jScrollArrowUp', 'tabindex':-1})
								.css({'width':settings.scrollbarWidth+'px'})
								.html('Scroll up')
								.bind('mousedown', function()
								{
									currentArrowButton = $(this);
									currentArrowDirection = -1;
									onArrowMouseDown();
									this.blur();
									return false;
								})
								.bind('click', rf),
							$('<a></a>')
								.attr({'href':'javascript:;', 'className':'jScrollArrowDown', 'tabindex':-1})
								.css({'width':settings.scrollbarWidth+'px'})
								.html('Scroll down')
								.bind('mousedown', function()
								{
									currentArrowButton = $(this);
									currentArrowDirection = 1;
									onArrowMouseDown();
									this.blur();
									return false;
								})
								.bind('click', rf)
						);
					var $upArrow = $('>.jScrollArrowUp', $container);
					var $downArrow = $('>.jScrollArrowDown', $container);
					if (settings.arrowSize) {
						trackHeight = paneHeight - settings.arrowSize - settings.arrowSize;
						$track
							.css({'height': trackHeight+'px', top:settings.arrowSize+'px'})
					} else {
						var topArrowHeight = $upArrow.height();
						settings.arrowSize = topArrowHeight;
						trackHeight = paneHeight - topArrowHeight - $downArrow.height();
						$track
							.css({'height': trackHeight+'px', top:topArrowHeight+'px'})
					}
				}
				
				var $pane = $(this).css({'position':'absolute', 'overflow':'visible'});
				
				var currentOffset;
				var maxY;
				var mouseWheelMultiplier;
				// store this in a seperate variable so we can keep track more accurately than just updating the css property..
				var dragPosition = 0;
				var dragMiddle = percentInView*paneHeight/2;
				
				// pos function borrowed from tooltip plugin and adapted...
				var getPos = function (event, c) {
					var p = c == 'X' ? 'Left' : 'Top';
					return event['page' + c] || (event['client' + c] + (document.documentElement['scroll' + p] || document.body['scroll' + p])) || 0;
				};
				
				var ignoreNativeDrag = function() {	return false; };
				
				var initDrag = function()
				{
					ceaseAnimation();
					currentOffset = $drag.offset(false);
					currentOffset.top -= dragPosition;
					maxY = trackHeight - $drag[0].offsetHeight;
					mouseWheelMultiplier = 2 * settings.wheelSpeed * maxY / contentHeight;
				};
				
				var onStartDrag = function(event)
				{
					initDrag();
					dragMiddle = getPos(event, 'Y') - dragPosition - currentOffset.top;
					$('html').bind('mouseup', onStopDrag).bind('mousemove', updateScroll);
					if ($.browser.msie) {
						$('html').bind('dragstart', ignoreNativeDrag).bind('selectstart', ignoreNativeDrag);
					}
					return false;
				};
				var onStopDrag = function()
				{
					$('html').unbind('mouseup', onStopDrag).unbind('mousemove', updateScroll);
					dragMiddle = percentInView*paneHeight/2;
					if ($.browser.msie) {
						$('html').unbind('dragstart', ignoreNativeDrag).unbind('selectstart', ignoreNativeDrag);
					}
				};
				var positionDrag = function(destY)
				{
					destY = destY < 0 ? 0 : (destY > maxY ? maxY : destY);
					dragPosition = destY;
					$drag.css({'top':destY+'px'});
					var p = destY / maxY;
					$this.data('jScrollPanePosition', (paneHeight-contentHeight)*-p);
					$pane.css({'top':((paneHeight-contentHeight)*p) + 'px'});
					$this.trigger('scroll');
					if (settings.showArrows) {
						$upArrow[destY == 0 ? 'addClass' : 'removeClass']('disabled');
						$downArrow[destY == maxY ? 'addClass' : 'removeClass']('disabled');
					}
				};
				var updateScroll = function(e)
				{
					positionDrag(getPos(e, 'Y') - currentOffset.top - dragMiddle);
				};
				
				var dragH = Math.max(Math.min(percentInView*(paneHeight-settings.arrowSize*2), settings.dragMaxHeight), settings.dragMinHeight);
				
				$drag.css(
					{'height':dragH+'px'}
				).bind('mousedown', onStartDrag);
				
				var trackScrollInterval;
				var trackScrollInc;
				var trackScrollMousePos;
				var doTrackScroll = function()
				{
					if (trackScrollInc > 8 || trackScrollInc%4==0) {
						positionDrag((dragPosition - ((dragPosition - trackScrollMousePos) / 2)));
					}
					trackScrollInc ++;
				};
				var onStopTrackClick = function()
				{
					clearInterval(trackScrollInterval);
					$('html').unbind('mouseup', onStopTrackClick).unbind('mousemove', onTrackMouseMove);
				};
				var onTrackMouseMove = function(event)
				{
					trackScrollMousePos = getPos(event, 'Y') - currentOffset.top - dragMiddle;
				};
				var onTrackClick = function(event)
				{
					initDrag();
					onTrackMouseMove(event);
					trackScrollInc = 0;
					$('html').bind('mouseup', onStopTrackClick).bind('mousemove', onTrackMouseMove);
					trackScrollInterval = setInterval(doTrackScroll, 100);
					doTrackScroll();
					return false;
				};
				
				$track.bind('mousedown', onTrackClick);
				
				$container.bind(
					'mousewheel',
					function (event, delta) {
						delta = delta || (event.wheelDelta ? event.wheelDelta / 120 : (event.detail) ?
-event.detail/3 : 0);
						initDrag();
						ceaseAnimation();
						var d = dragPosition;
						positionDrag(dragPosition - delta * mouseWheelMultiplier);
						var dragOccured = d != dragPosition;
						return !dragOccured;
					}
				);

				var _animateToPosition;
				var _animateToInterval;
				function animateToPosition()
				{
					var diff = (_animateToPosition - dragPosition) / settings.animateStep;
					if (diff > 1 || diff < -1) {
						positionDrag(dragPosition + diff);
					} else {
						positionDrag(_animateToPosition);
						ceaseAnimation();
					}
				}
				var ceaseAnimation = function()
				{
					if (_animateToInterval) {
						clearInterval(_animateToInterval);
						delete _animateToPosition;
					}
				};
				var scrollTo = function(pos, preventAni)
				{
					if (typeof pos == "string") {
						$e = $(pos, $this);
						if (!$e.length) return;
						pos = $e.offset().top - $this.offset().top;
					}
					$container.scrollTop(0);
					ceaseAnimation();
					var maxScroll = contentHeight - paneHeight;
					pos = pos > maxScroll ? maxScroll : pos;
					$this.data('jScrollPaneMaxScroll', maxScroll);
					var destDragPosition = pos/maxScroll * maxY;
					if (preventAni || !settings.animateTo) {
						positionDrag(destDragPosition);
					} else {
						_animateToPosition = destDragPosition;
						_animateToInterval = setInterval(animateToPosition, settings.animateInterval);
					}
				};
				$this[0].scrollTo = scrollTo;
				
				$this[0].scrollBy = function(delta)
				{
					var currentPos = -parseInt($pane.css('top')) || 0;
					scrollTo(currentPos + delta);
				};
				
				initDrag();
				
				scrollTo(-currentScrollPosition, true);
			
				// Deal with it when the user tabs to a link or form element within this scrollpane
				$('*', this).bind(
					'focus',
					function(event)
					{
						var $e = $(this);
						
						// loop through parents adding the offset top of any elements that are relatively positioned between
						// the focused element and the jScrollPaneContainer so we can get the true distance from the top
						// of the focused element to the top of the scrollpane...
						var eleTop = 0;
						
						while ($e[0] != $this[0]) {
							eleTop += $e.position().top;
							$e = $e.offsetParent();
						}
						
						var viewportTop = -parseInt($pane.css('top')) || 0;
						var maxVisibleEleTop = viewportTop + paneHeight;
						var eleInView = eleTop > viewportTop && eleTop < maxVisibleEleTop;
						if (!eleInView) {
							var destPos = eleTop - settings.scrollbarMargin;
							if (eleTop > viewportTop) { // element is below viewport - scroll so it is at bottom.
								destPos += $(this).height() + 15 + settings.scrollbarMargin - paneHeight;
							}
							scrollTo(destPos);
						}
					}
				)
				
				
				if (location.hash) {
					setTimeout(function() {scrollTo(location.hash);}, $.browser.safari ? 100 : 0);
				}
				
				// use event delegation to listen for all clicks on links and hijack them if they are links to
				// anchors within our content...
				$(document).bind(
					'click',
					function(e)
					{
						$target = $(e.target);
						if ($target.is('a')) {
							var h = $target.attr('href');
							if (h && h.substr(0, 1) == '#' && h.length > 1) {
								setTimeout(function() {scrollTo(h, !settings.animateToInternalLinks);}, $.browser.safari ? 100 : 0);
							}
						}
					}
				); 
				
				// Deal with dragging and selecting text to make the scrollpane scroll...
				function onSelectScrollMouseDown(e)
				{
				   $(document).bind('mousemove.jScrollPaneDragging', onTextSelectionScrollMouseMove);
				   $(document).bind('mouseup.jScrollPaneDragging',   onSelectScrollMouseUp);
				  
				}
				
				var textDragDistanceAway;
				var textSelectionInterval;
				
				function onTextSelectionInterval()
				{
					direction = textDragDistanceAway < 0 ? -1 : 1;
					$this[0].scrollBy(textDragDistanceAway / 2);
				}

				function clearTextSelectionInterval()
				{
					if (textSelectionInterval) {
						clearInterval(textSelectionInterval);
						textSelectionInterval = undefined;
					}
				}
				
				function onTextSelectionScrollMouseMove(e)
				{
					var offset = $this.parent().offset().top;
					var maxOffset = offset + paneHeight;
					var mouseOffset = getPos(e, 'Y');
					textDragDistanceAway = mouseOffset < offset ? mouseOffset - offset : (mouseOffset > maxOffset ? mouseOffset - maxOffset : 0);
					if (textDragDistanceAway == 0) {
						clearTextSelectionInterval();
					} else {
						if (!textSelectionInterval) {
							textSelectionInterval  = setInterval(onTextSelectionInterval, 100);
						}
					}
				}

				function onSelectScrollMouseUp(e)
				{
				   $(document)
					  .unbind('mousemove.jScrollPaneDragging')
					  .unbind('mouseup.jScrollPaneDragging');
				   clearTextSelectionInterval();
				}

				$container.bind('mousedown.jScrollPane', onSelectScrollMouseDown);

				
				$.jScrollPane.active.push($this[0]);
				
			} else {
				$this.css(
					{
						'height':paneHeight+'px',
						'width':paneWidth-this.originalSidePaddingTotal+'px',
						'padding':this.originalPadding
					}
				);
				$this[0].scrollTo = $this[0].scrollBy = function() {};
				// clean up listeners
				$this.parent().unbind('mousewheel').unbind('mousedown.jScrollPane').unbind('keydown.jscrollpane').unbind('keyup.jscrollpane');
			}
			
		}
	)
};

$.fn.jScrollPaneRemove = function()
{
	$(this).each(function()
	{
		$this = $(this);
		var $c = $this.parent();
		if ($c.is('.jScrollPaneContainer')) {
			$this.css(
				{
					'top':'',
					'height':'',
					'width':'',
					'padding':'',
					'overflow':'',
					'position':''
				}
			);
			$c.after($this).remove();
		}
	});
}

$.fn.jScrollPane.defaults = {
	scrollbarWidth : 10,
	scrollbarMargin : 5,
	wheelSpeed : 18,
	showArrows : false,
	arrowSize : 0,
	animateTo : false,
	dragMinHeight : 1,
	dragMaxHeight : 99999,
	animateInterval : 100,
	animateStep: 3,
	maintainPosition: true,
	scrollbarOnLeft: false,
	reinitialiseOnImageLoad: false,
	tabIndex : 0,
	enableKeyboardNavigation: true,
	animateToInternalLinks: false
};

// clean up the scrollTo expandos
$(window)
	.bind('unload', function() {
		var els = $.jScrollPane.active; 
		for (var i=0; i<els.length; i++) {
			els[i].scrollTo = els[i].scrollBy = null;
		}
	}
);

})(jQuery);