/*
 * jQuery.splitter.js - two-pane splitter window plugin
 *
 * version 1.6 (2010/01/03) 
 * 
 * Dual licensed under the MIT and GPL licenses: 
 *   http://www.opensource.org/licenses/mit-license.php 
 *   http://www.gnu.org/licenses/gpl.html 
 */
 
/**
 * The splitter() plugin implements a two-pane resizable splitter window.
 * The selected elements in the jQuery object are converted to a splitter;
 * each selected element should have two child elements, used for the panes
 * of the splitter. The plugin adds a third child element for the splitbar.
 * 
 * For more details see: http://methvin.com/jquery/splitter/
 *
 *
 * @example $('#MySplitter').splitter();
 * @desc Create a vertical splitter with default settings 
 *
 * @example $('#MySplitter').splitter({type: 'h', accessKey: 'M'});
 * @desc Create a horizontal splitter resizable via Alt+Shift+M
 *
 * @name splitter
 * @type jQuery
 * @param Object options Options for the splitter (not required)
 * @cat Plugins/Splitter
 * @return jQuery
 * @author Dave Methvin (dave.methvin@gmail.com)
 */
 ;(function($){

var splitterCounter = 0;

 $.fn.splitter = function(args){
	args = args || {};
	return this.each(function() {
		if ( $(this).is(".splitter") )	// already a splitter
			return;
		var zombie;		// left-behind splitbar for outline resizes
		function setBarState(state) {
			bar.removeClass(opts.barStateClasses).addClass(state);
		}
		function startSplitMouse(evt) {
			if ( evt.which != 1 )
				return;		// left button only
			bar.removeClass(opts.barHoverClass);
			if ( opts.outline ) {
				zombie = zombie || bar.clone(false).insertAfter(A);
				bar.removeClass(opts.barDockedClass);
			}
			setBarState(opts.barActiveClass)
			// Safari selects A/B text on a move; iframes capture mouse events so hide them
			panes.css("-webkit-user-select", "none").find("iframe").andSelf().filter("iframe").addClass(opts.iframeClass);
			A._posSplit = A[0][opts.pxSplit] - evt[opts.eventPos];
			$(document)
				.bind("mousemove"+opts.eventNamespace, doSplitMouse)
				.bind("mouseup"+opts.eventNamespace, endSplitMouse);
		}
		function doSplitMouse(evt) {
			var pos = A._posSplit+evt[opts.eventPos],
				range = Math.max(0, Math.min(pos, splitter._DA - bar._DA)),
				limit = Math.max(A._min, splitter._DA - B._max, 
						Math.min(pos, A._max, splitter._DA - bar._DA - B._min));
			if ( opts.outline ) {
				// Let docking splitbar be dragged to the dock position, even if min width applies
				if ( (opts.dockPane == A && pos < Math.max(A._min, bar._DA))  || 
					 (opts.dockPane == B && pos > Math.min(pos, A._max, splitter._DA - bar._DA - B._min)) ) {
					bar.addClass(opts.barDockedClass).css(opts.origin, range);
				}
				else {
					bar.removeClass(opts.barDockedClass).css(opts.origin, limit);
				}
				bar._DA = bar[0][opts.pxSplit];
			} else 
				resplit(pos);
			setBarState(pos == limit? opts.barActiveClass : opts.barLimitClass);
		}
		function endSplitMouse(evt) {
			setBarState(opts.barNormalClass);
			bar.addClass(opts.barHoverClass);
			var pos = A._posSplit+evt[opts.eventPos];
			if ( opts.outline ) {
				zombie.remove(); zombie = null;
				resplit(pos);
			}
			panes.css("-webkit-user-select", "text").find("iframe").andSelf().filter("iframe").removeClass(opts.iframeClass);
			$(document)
				.unbind("mousemove"+opts.eventNamespace+" mouseup"+opts.eventNamespace);
		}
		function resplit(pos) {
			bar._DA = bar[0][opts.pxSplit];		// bar size may change during dock
			// Constrain new splitbar position to fit pane size and docking limits
			if ( (opts.dockPane == A && pos < Math.max(A._min, bar._DA)) ||
				 (opts.dockPane == B && pos > Math.min(pos, A._max, splitter._DA - bar._DA - B._min)) ) {
				bar.addClass(opts.barDockedClass);
				bar._DA = bar[0][opts.pxSplit];
				pos = opts.dockPane == A? 0 : splitter._DA - bar._DA;
				if ( bar._pos == null )
					bar._pos = A[0][opts.pxSplit];
			}
			else {
				bar.removeClass(opts.barDockedClass);
				bar._DA = bar[0][opts.pxSplit];
				bar._pos = null;
				pos = Math.max(A._min, splitter._DA - B._max, 
						Math.min(pos, A._max, splitter._DA - bar._DA - B._min));
			}
			// Resize/position the two panes
			bar.css(opts.origin, pos).css(opts.fixed, splitter._DF);
			A.css(opts.origin, 0).css(opts.split, pos).css(opts.fixed,  splitter._DF);
			B.css(opts.origin, pos+bar._DA)
				.css(opts.split, splitter._DA-bar._DA-pos).css(opts.fixed,  splitter._DF);
			panes.trigger("resize"+opts.eventNamespace);
		}
		function dimSum(jq, dims) {
			// Opera returns -1 for missing min/max width, turn into 0
			var sum = 0;
			for ( var i=1; i < arguments.length; i++ )
				sum += Math.max(parseInt(jq.css(arguments[i]),10) || 0, 0);
			return sum;
		}
		
		// Determine settings based on incoming opts, element classes, and defaults
		var vh = (args.splitHorizontal? 'h' : args.splitVertical? 'v' : args.type) || 'v';
		var opts = $.extend({
			// Defaults here allow easy use with ThemeRoller
			splitterClass:	"splitter ui-widget ui-widget-content",
			paneClass:		"splitter-pane",
			barClass:		"splitter-bar",
			barNormalClass: "ui-state-default",			// splitbar normal
			barHoverClass:  "ui-state-hover",			// splitbar mouse hover
			barActiveClass: "ui-state-highlight",		// splitbar being moved
			barLimitClass:  "ui-state-error",			// splitbar at limit
			iframeClass:	"splitter-iframe-hide",		// hide iframes during split
			eventNamespace:	".splitter"+(++splitterCounter),
			pxPerKey: 8,			// splitter px moved per keypress
			tabIndex: 0,			// tab order indicator
			accessKey: ''			// accessKey for splitbar
		},{
			// user can override
			v: {					// Vertical splitters:
				keyLeft: 39, keyRight: 37, cursor: "e-resize",
				barStateClass: "splitter-bar-vertical", 
				barDockedClass: "splitter-bar-vertical-docked"
			},
			h: {					// Horizontal splitters:
				keyTop: 40, keyBottom: 38,  cursor: "n-resize",
				barStateClass: "splitter-bar-horizontal",
				barDockedClass: "splitter-bar-horizontal-docked"
			}
		}[vh], args, {
			// user cannot override
			v: {					// Vertical splitters:
				type: 'v', eventPos: "pageX", origin: "left",
				split: "width",  pxSplit: "offsetWidth",  side1: "Left", side2: "Right",
				fixed: "height", pxFixed: "offsetHeight", side3: "Top",  side4: "Bottom"
			},
			h: {					// Horizontal splitters:
				type: 'h', eventPos: "pageY", origin: "top",
				split: "height", pxSplit: "offsetHeight", side1: "Top",  side2: "Bottom",
				fixed: "width",  pxFixed: "offsetWidth",  side3: "Left", side4: "Right"
			}
		}[vh]);
		opts.barStateClasses = [opts.barNormalClass, opts.barHoverClass, opts.barActiveClass, opts.barLimitClass].join(' ');

		// Create jQuery object closures for splitter and both panes
		var splitter = $(this).css({position: "relative"}).addClass(opts.splitterClass);
		var panes = $(">*", splitter[0]).addClass(opts.paneClass).css({
			position: "absolute", 			// positioned inside splitter container
			"z-index": "1",					// splitbar is positioned above
			"-moz-outline-style": "none"	// don't show dotted outline
		});
		var A = $(panes[0]), B = $(panes[1]);	// A = left/top, B = right/bottom
		opts.dockPane = opts.dock && (/right|bottom/.test(opts.dock)? B:A);

		// Focuser element, provides keyboard support; title is shown by Opera accessKeys
		var focuser = $('<a href="javascript:void(0)"></a>')
			.attr({accessKey: opts.accessKey, tabIndex: opts.tabIndex, title: opts.splitbarClass})
			.bind(("focus")+opts.eventNamespace, 
				function(){ this.focus(); bar.addClass(opts.barActiveClass) })
			.bind("keydown"+opts.eventNamespace, function(e){
				var key = e.which || e.keyCode;
				var dir = key==opts["key"+opts.side1]? 1 : key==opts["key"+opts.side2]? -1 : 0;
				if ( dir )
					resplit(A[0][opts.pxSplit]+dir*opts.pxPerKey, false);
			})
			.bind("blur"+opts.eventNamespace, 
				function(){ bar.removeClass(opts.barActiveClass) });
			
		// Splitbar element
		var bar = $('<div></div>')
			.insertAfter(A).addClass(opts.barClass).addClass(opts.barStateClass)
			.append(focuser).attr({unselectable: "on"})
			.css({position: "absolute",	"user-select": "none", "-webkit-user-select": "none",
				"-khtml-user-select": "none", "-moz-user-select": "none", "z-index": "100"})
			.bind("mousedown"+opts.eventNamespace, startSplitMouse)
			.bind("mouseover"+opts.eventNamespace, function(){
				$(this).addClass(opts.barHoverClass);
			})
			.bind("mouseout"+opts.eventNamespace, function(){
				$(this).removeClass(opts.barHoverClass);
			});
		// Use our cursor unless the style specifies a non-default cursor
		if ( /^(auto|default|)$/.test(bar.css("cursor")) )
			bar.css("cursor", opts.cursor);

		// Cache several dimensions for speed, rather than re-querying constantly
		// These are saved on the A/B/bar/splitter jQuery vars, which are themselves cached
		// DA=dimension adjustable direction, PBF=padding/border fixed, PBA=padding/border adjustable
		bar._DA = bar[0][opts.pxSplit];
		splitter._PBF = dimSum(splitter, "border"+opts.side3+"Width", "border"+opts.side4+"Width");
		splitter._PBA = dimSum(splitter, "border"+opts.side1+"Width", "border"+opts.side2+"Width");
		A._pane = opts.side1;
		B._pane = opts.side2;
		$.each([A,B], function(){
			this._splitter_style = this.style;
			this._min = opts["min"+this._pane] || dimSum(this, "min-"+opts.split);
			this._max = opts["max"+this._pane] || dimSum(this, "max-"+opts.split) || 9999;
			this._init = opts["size"+this._pane]===true ?
				parseInt($.curCSS(this[0],opts.split),10) : opts["size"+this._pane];
		});
		
		// Determine initial position, get from cookie if specified
		var initPos = A._init;
		if ( !isNaN(B._init) )	// recalc initial B size as an offset from the top or left side
			initPos = splitter[0][opts.pxSplit] - splitter._PBA - B._init - bar._DA;
		if ( opts.cookie ) {
			if ( !$.cookie )
				alert('jQuery.splitter(): jQuery cookie plugin required');
			initPos = parseInt($.cookie(opts.cookie),10);
			$(window).bind("unload"+opts.eventNamespace, function(){
				var state = String(bar.css(opts.origin));	// current location of splitbar
				$.cookie(opts.cookie, state, {expires: opts.cookieExpires || 365, 
					path: opts.cookiePath || document.location.pathname});
			});
		}
		if ( isNaN(initPos) )	// King Solomon's algorithm
			initPos = Math.round((splitter[0][opts.pxSplit] - splitter._PBA - bar._DA)/2);

		// Resize event propagation and splitter sizing
		if ( opts.anchorToWindow )
			opts.resizeTo = window;
		if ( opts.resizeTo ) {
			splitter._hadjust = dimSum(splitter, "borderTopWidth", "borderBottomWidth", "marginBottom");
			splitter._hmin = Math.max(dimSum(splitter, "minHeight"), 20);
			$(window).bind("resize"+opts.eventNamespace, function(){
				var top = splitter.offset().top;
				var eh = $(opts.resizeTo).height();
				splitter.css("height", Math.max(eh-top-splitter._hadjust, splitter._hmin)+"px");
				splitter.trigger("resize");
			}).trigger("resize"+opts.eventNamespace);
		}
		else if ( opts.resizeToWidth ) {
			$(window).bind("resize"+opts.eventNamespace, function(){
				splitter.trigger("resize");
			});
		}

		// Docking support
		if ( opts.dock ) {
			splitter
				.bind("toggleDock"+opts.eventNamespace, function() {
					var pw = opts.dockPane[0][opts.pxSplit];
					splitter.trigger(pw?"dock":"undock");
				})
				.bind("dock"+opts.eventNamespace, function(){
					var pw = A[0][opts.pxSplit]; 
					if ( !pw ) return;
					// Don't try to dock twice
					if (bar.hasClass("splitter-bar-horizontal-docked") || bar.hasClass("splitter-bar-vertical-docked"))
						return;
					bar._pos = pw;
					var x={}; 
					x[opts.origin] = opts.dockPane==A? 0 :
						splitter[0][opts.pxSplit] - splitter._PBA - bar[0][opts.pxSplit];
					bar.animate(x, opts.dockSpeed||1, opts.dockEasing, function(){
						bar.addClass(opts.barDockedClass);
						resplit(x[opts.origin]+1);
					});
				})
				.bind("undock"+opts.eventNamespace, function(){
					var pw = opts.dockPane[0][opts.pxSplit];
					if ( pw ) return;
					// 20px away is too close, reset to 50%
					if(Math.abs(bar._pos - splitter._DA - bar._DA) < 20) bar._pos =  splitter._DA / 2;
					var x={}; x[opts.origin]=bar._pos+"px";
					bar.removeClass(opts.barDockedClass)
						.animate(x, opts.undockSpeed||opts.dockSpeed||1, opts.undockEasing||opts.dockEasing, function(){
							resplit(bar._pos);
							bar._pos = null;
						});
				});
			if ( opts.dockKey )
				$('<a title="'+opts.splitbarClass+' toggle dock" href="javascript:void(0)"></a>')
					.attr({accessKey: opts.dockKey, tabIndex: -1}).appendTo(bar)
					.bind("focus", function(){ 
						splitter.trigger("toggleDock"); this.blur();
					});
			bar.bind("dblclick", function(){ splitter.trigger("toggleDock"); })
		}

		
		// Resize event handler; triggered immediately to set initial position
		splitter
			.bind("destroy"+opts.eventNamespace, function(){
				$([window, document]).unbind(opts.eventNamespace);
				bar.unbind().remove();
				panes.removeClass(opts.paneClass);
				splitter
					.removeClass(opts.splitterClass)
					.add(panes)
						.unbind(opts.eventNamespace)
						.attr("style", function(el){
							return this._splitter_style||"";	//TODO: save style
						});
				splitter = bar = focuser = panes = A = B = opts = args = null;
			})
			.bind("resize"+opts.eventNamespace, function(e, size){
				// Custom events bubble in jQuery 1.3; avoid recursion
				if ( e.target != this ) return;
				// Determine new width/height of splitter container
				splitter._DF = splitter[0][opts.pxFixed] - splitter._PBF;
				splitter._DA = splitter[0][opts.pxSplit] - splitter._PBA;
				// Bail if splitter isn't visible or content isn't there yet
				if ( splitter._DF <= 0 || splitter._DA <= 0 ) return;
				// Re-divvy the adjustable dimension; maintain size of the preferred pane
				resplit(!isNaN(size)? size : (!(opts.sizeRight||opts.sizeBottom)? A[0][opts.pxSplit] :
					splitter._DA-B[0][opts.pxSplit]-bar._DA));
				setBarState(opts.barNormalClass);
			})
			.trigger("resize" , [initPos]);
	});
};

})(jQuery);