/*
 * treeview 1.4 - jquery plugin to hide and show branches of a tree
 *
 * http://bassistance.de/jquery-plugins/jquery-plugin-treeview/
 * http://docs.jquery.com/plugins/treeview
 *
 * copyright (c) 2007 jörn zaefferer
 *
 * dual licensed under the mit and gpl licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
 * revision: $id: jquery.treeview.js 4684 2008-02-07 19:08:06z joern.zaefferer $
 *
 */

;(function($) {

	$.extend($.fn, {
		swapclass: function(c1, c2) {
			var c1elements = this.filter('.' + c1);
			this.filter('.' + c2).removeclass(c2).addclass(c1);
			c1elements.removeclass(c1).addclass(c2);
			return this;
		},
		replaceclass: function(c1, c2) {
			return this.filter('.' + c1).removeclass(c1).addclass(c2).end();
		},
		hoverclass: function(classname) {
			classname = classname || "hover";
			return this.hover(function() {
				$(this).addclass(classname);
			}, function() {
				$(this).removeclass(classname);
			});
		},
		heighttoggle: function(animated, callback) {
			animated ?
				this.animate({ height: "toggle" }, animated, callback) :
				this.each(function(){
					jquery(this)[ jquery(this).is(":hidden") ? "show" : "hide" ]();
					if(callback)
						callback.apply(this, arguments);
				});
		},
		heighthide: function(animated, callback) {
			if (animated) {
				this.animate({ height: "hide" }, animated, callback);
			} else {
				this.hide();
				if (callback)
					this.each(callback);				
			}
		},
		preparebranches: function(settings) {
			if (!settings.prerendered) {
				// mark last tree items
				this.filter(":last-child:not(ul)").addclass(classes.last);
				// collapse whole tree, or only those marked as closed, anyway except those marked as open
				this.filter((settings.collapsed ? "" : "." + classes.closed) + ":not(." + classes.open + ")").find(">ul").hide();
			}
			// return all items with sublists
			return this.filter(":has(>ul)");
		},
		applyclasses: function(settings, toggler) {
			this.filter(":has(>ul):not(:has(>a))").find(">span").click(function(event) {
				toggler.apply($(this).next());
			}).add( $("a", this) ).hoverclass();
			
			if (!settings.prerendered) {
				// handle closed ones first
				this.filter(":has(>ul:hidden)")
						.addclass(classes.expandable)
						.replaceclass(classes.last, classes.lastexpandable);
						
				// handle open ones
				this.not(":has(>ul:hidden)")
						.addclass(classes.collapsable)
						.replaceclass(classes.last, classes.lastcollapsable);
						
				/*	插入隐藏	
	            // create hitarea
				this.prepend("<div class=\"" + classes.hitarea + "\"/>").find("div." + classes.hitarea).each(function() {
					var classes = "";
					$.each($(this).parent().attr("class").split(" "), function() {
						classes += this + "-hitarea ";
					});
					$(this).addclass( classes );
				});  结束*/
			}
			
			// apply event to hitarea
			this.find("div." + classes.hitarea).click( toggler );
		},
		treeview: function(settings) {
			
			settings = $.extend({
				cookieid: "treeview"
			}, settings);
			
			if (settings.add) {
				return this.trigger("add", [settings.add]);
			}
			
			if ( settings.toggle ) {
				var callback = settings.toggle;
				settings.toggle = function() {
					return callback.apply($(this).parent()[0], arguments);
				};
			}
		
			// factory for treecontroller
			function treecontroller(tree, control) {
				// factory for click handlers
				function handler(filter) {
					return function() {
						// reuse toggle event handler, applying the elements to toggle
						// start searching for all hitareas
						toggler.apply( $("div." + classes.hitarea, tree).filter(function() {
							// for plain toggle, no filter is provided, otherwise we need to check the parent element
							return filter ? $(this).parent("." + filter).length : true;
						}) );
						return false;
					};
				}
				// click on first element to collapse tree
				$("a:eq(0)", control).click( handler(classes.collapsable) );
				// click on second to expand tree
				$("a:eq(1)", control).click( handler(classes.expandable) );
				// click on third to toggle tree
				$("a:eq(2)", control).click( handler() ); 
			}
		
			// handle toggle event
			function toggler() {
				$(this)
					.parent()
					// swap classes for hitarea
					.find(">.hitarea")
						.swapclass( classes.collapsablehitarea, classes.expandablehitarea )
						.swapclass( classes.lastcollapsablehitarea, classes.lastexpandablehitarea )
					.end()
					// swap classes for parent li
					.swapclass( classes.collapsable, classes.expandable )
					.swapclass( classes.lastcollapsable, classes.lastexpandable )
					// find child lists
					.find( ">ul" )
					// toggle them
					.heighttoggle( settings.animated, settings.toggle );
				if ( settings.unique ) {
					$(this).parent()
						.siblings()
						// swap classes for hitarea
						.find(">.hitarea")
							.replaceclass( classes.collapsablehitarea, classes.expandablehitarea )
							.replaceclass( classes.lastcollapsablehitarea, classes.lastexpandablehitarea )
						.end()
						.replaceclass( classes.collapsable, classes.expandable )
						.replaceclass( classes.lastcollapsable, classes.lastexpandable )
						.find( ">ul" )
						.heighthide( settings.animated, settings.toggle );
				}
			}
			
			function serialize() {
				function binary(arg) {
					return arg ? 1 : 0;
				}
				var data = [];
				branches.each(function(i, e) {
					data[i] = $(e).is(":has(>ul:visible)") ? 1 : 0;
				});
				$.cookie(settings.cookieid, data.join("") );
			}
			
			function deserialize() {
				var stored = $.cookie(settings.cookieid);
				if ( stored ) {
					var data = stored.split("");
					branches.each(function(i, e) {
						$(e).find(">ul")[ parseint(data[i]) ? "show" : "hide" ]();
					});
				}
			}
			
			// add treeview class to activate styles
			this.addclass("treeview");
			
			// prepare branches and find all tree items with child lists
			var branches = this.find("li").preparebranches(settings);
			
			switch(settings.persist) {
			case "cookie":
				var togglecallback = settings.toggle;
				settings.toggle = function() {
					serialize();
					if (togglecallback) {
						togglecallback.apply(this, arguments);
					}
				};
				deserialize();
				break;
			case "location":
				var current = this.find("a").filter(function() { return this.href.tolowercase() == location.href.tolowercase(); });
				if ( current.length ) {
					current.addclass("selected").parents("ul, li").add( current.next() ).show();
				}
				break;
			}
			
			branches.applyclasses(settings, toggler);
				
			// if control option is set, create the treecontroller and show it
			if ( settings.control ) {
				treecontroller(this, settings.control);
				$(settings.control).show();
			}
			
			return this.bind("add", function(event, branches) {
				$(branches).prev()
					.removeclass(classes.last)
					.removeclass(classes.lastcollapsable)
					.removeclass(classes.lastexpandable)
				.find(">.hitarea")
					.removeclass(classes.lastcollapsablehitarea)
					.removeclass(classes.lastexpandablehitarea);
				$(branches).find("li").andself().preparebranches(settings).applyclasses(settings, toggler);
			});
		}
	});
	
	// classes used by the plugin
	// need to be styled via external stylesheet, see first example
	var classes = $.fn.treeview.classes = {
		open: "open",
		closed: "closed",
		expandable: "expandable",
		expandablehitarea: "expandable-hitarea",
		lastexpandablehitarea: "lastexpandable-hitarea",
		collapsable: "collapsable",
		collapsablehitarea: "collapsable-hitarea",
		lastcollapsablehitarea: "lastcollapsable-hitarea",
		lastcollapsable: "lastcollapsable",
		lastexpandable: "lastexpandable",
		last: "last",
		hitarea: "hitarea"
	};
	
	// provide backwards compability
	$.fn.treeview = $.fn.treeview;
	
})(jquery);