/*
 * jQuery UI Menu @VERSION
 * 
 * Copyright 2010, AUTHORS.txt
 * Dual licensed under the MIT or GPL Version 2 licenses.
 * http://jquery.org/license
 *
 * http://docs.jquery.com/UI/Menu
 *
 * Depends:
 *	jquery.ui.core.js
 *	jquery.ui.widget.js
 */
(function($) {

$.widget("ui.menu", {
	_create: function() {
		var self = this;
		this.element
			.addClass( "ui-menu ui-widget ui-widget-content ui-corner-all" )
			.attr({
				role: "listbox",
				"aria-activedescendant": "ui-active-menuitem"
			})
			.bind( "click.menu", function( event ) {
				if ( self.options.disabled ) {
					return false;
				}
				if ( !$( event.target ).closest( ".ui-menu-item a" ).length ) {
					return;
				}
				// temporary
				event.preventDefault();
				self.select( event );
			})
			.bind( "mouseover.menu", function( event ) {
				if ( self.options.disabled ) {
					return;
				}
				var target = $( event.target ).closest( ".ui-menu-item" );
				if ( target.length && target.parent()[0] === self.element[0] ) {
					self.activate( event, target );
				}
			})
			.bind("mouseout.menu", function( event ) {
				if ( self.options.disabled ) {
					return;
				}
				var target = $( event.target ).closest( ".ui-menu-item" );
				if ( target.length && target.parent()[0] === self.element[0] ) {
					self.deactivate( event );
				}
			});
		this.refresh();
		
		if ( !this.options.input ) {
			this.options.input = this.element.attr( "tabIndex", 0 );
		}
		this.options.input.bind( "keydown.menu", function( event ) {
			if ( self.options.disabled ) {
				return;
			}
			switch ( event.keyCode ) {
			case $.ui.keyCode.PAGE_UP:
				self.previousPage();
				event.preventDefault();
				event.stopImmediatePropagation();
				break;
			case $.ui.keyCode.PAGE_DOWN:
				self.nextPage();
				event.preventDefault();
				event.stopImmediatePropagation();
				break;
			case $.ui.keyCode.UP:
				self.previous();
				event.preventDefault();
				event.stopImmediatePropagation();
				break;
			case $.ui.keyCode.DOWN:
				self.next();
				event.preventDefault();
				event.stopImmediatePropagation();
				break;
			case $.ui.keyCode.ENTER:
				self.select();
				event.preventDefault();
				event.stopImmediatePropagation();
				break;
			}
		});
	},
	
	destroy: function() {
		$.Widget.prototype.destroy.apply( this, arguments );
		
		this.element
			.removeClass( "ui-menu ui-widget ui-widget-content ui-corner-all" )
			.removeAttr( "tabIndex" )
			.removeAttr( "role" )
			.removeAttr( "aria-activedescendant" );
		
		this.element.children( ".ui-menu-item" )
			.removeClass( "ui-menu-item" )
			.removeAttr( "role" )
			.children( "a" )
			.removeClass( "ui-corner-all" )
			.removeAttr( "tabIndex" )
			.unbind( ".menu" );
	},
	
	refresh: function() {
		// don't refresh list items that are already adapted
		var items = this.element.children( "li:not(.ui-menu-item):has(a)" )
			.addClass( "ui-menu-item" )
			.attr( "role", "menuitem" );
		
		items.children( "a" )
			.addClass( "ui-corner-all" )
			.attr( "tabIndex", -1 );
	},

	activate: function( event, item ) {
		this.deactivate();
		if ( this._hasScroll() ) {
			var borderTop = parseFloat( $.curCSS( this.element[0], "borderTopWidth", true) ) || 0,
				paddingtop = parseFloat( $.curCSS( this.element[0], "paddingTop", true) ) || 0,
				offset = item.offset().top - this.element.offset().top - borderTop - paddingtop,
				scroll = this.element.attr( "scrollTop" ),
				elementHeight = this.element.height(),
				itemHeight = item.height();
			if ( offset < 0 ) {
				this.element.attr( "scrollTop", scroll + offset );
			} else if ( offset + itemHeight > elementHeight ) {
				this.element.attr( "scrollTop", scroll + offset - elementHeight + itemHeight );
			}
		}
		this.active = item.first()
			.children( "a" )
				.addClass( "ui-state-hover" )
				.attr( "id", "ui-active-menuitem" )
			.end();
		this._trigger( "focus", event, { item: item } );
	},

	deactivate: function(event) {
		if (!this.active) { return; }

		this.active.children( "a" )
			.removeClass( "ui-state-hover" )
			.removeAttr( "id" );
		this._trigger( "blur", event );
		this.active = null;
	},

	next: function(event) {
		this._move( "next", ".ui-menu-item", "first", event );
	},

	previous: function(event) {
		this._move( "prev", ".ui-menu-item", "last", event );
	},

	first: function() {
		return this.active && !this.active.prevAll( ".ui-menu-item" ).length;
	},

	last: function() {
		return this.active && !this.active.nextAll( ".ui-menu-item" ).length;
	},

	_move: function(direction, edge, filter, event) {
		if ( !this.active ) {
			this.activate( event, this.element.children(edge)[filter]() );
			return;
		}
		var next = this.active[ direction + "All" ]( ".ui-menu-item" ).eq( 0 );
		if ( next.length ) {
			this.activate( event, next );
		} else {
			this.activate( event, this.element.children(edge)[filter]() );
		}
	},
	
	nextPage: function( event ) {
		if ( this._hasScroll() ) {
			if ( !this.active || this.last() ) {
				this.activate( event, this.element.children( ".ui-menu-item" ).first() );
				return;
			}
			var base = this.active.offset().top,
				height = this.element.height(),
				result;
			this.active.nextAll( ".ui-menu-item" ).each( function() {
				result = $( this );
				return $( this ).offset().top - base - height < 0;
			});

			this.activate( event, result );
		} else {
			this.activate( event, this.element.children( ".ui-menu-item" )
				[ !this.active || this.last() ? "first" : "last" ]() );
		}
	},

	previousPage: function( event ) {
		if ( this._hasScroll() ) {
			if ( !this.active || this.first() ) {
				this.activate( event, this.element.children( ".ui-menu-item" ).last() );
				return;
			}

			var base = this.active.offset().top,
				height = this.element.height(),
				result;
			this.active.prevAll( ".ui-menu-item" ).each( function() {
				result = $( this );
				return $(this).offset().top - base + height > 0;
			});

			this.activate( event, result );
		} else {
			this.activate( event, this.element.children( ".ui-menu-item" )
				[ !this.active || this.first() ? ":last" : ":first" ]() );
		}
	},

	_hasScroll: function() {
		return this.element.height() < this.element.attr( "scrollHeight" );
	},

	select: function( event ) {
		this._trigger( "select", event, { item: this.active } );
	}
});

$.widget("ui.nestedmenu", {
	_init: function() {
		var self = this;
		this.active = this.element;
		
		// hide submenus and create indicator icons
		this.element.find("ul").hide().prev("a").prepend('<span class="ui-icon ui-icon-carat-1-e"></span>');	
		
		this.element.find("ul").andSelf().menu({
			// disable built-in key handling
			input: $(),
			select: this.options.select,
			focus: function(event, ui) {
				self.active = ui.item.parent();
				self.activeItem = ui.item;
				ui.item.parent().find("ul").hide();
				var nested = $(">ul", ui.item);
				if (nested.length && /^mouse/.test(event.originalEvent.type)) {
					self._open(nested);
				}
			}
		})
	},
	
	_open: function(submenu) {
		submenu.show().css({
			top: 0,
			left: 0
		}).position({
			my: "left top",
			at: "right top",
			of: this.activeItem
		});
	},
	
	up: function(event) {
		this.active = this.active.menu("deactivate").hide().parent().parent();
		this.activeItem = this.active.data("menu").active;
	},
	
	down: function(event) {
		var submenu = $(">ul", this.activeItem);
		this._open(submenu, this.activeItem);
		submenu.menu("activate", event, submenu.children(":first"));
	},
	
	show: function() {
		this.active = this.element;
		this.element.show();
	},
	
	hide: function() {
		this.element.find("ul").andSelf().menu("deactivate").hide();
	}
	
});




}( jQuery ));