/**
 * Copyright (c)2005-2009 Matt Kruse (javascripttoolbox.com)
 * 
 * Dual licensed under the MIT and GPL licenses. 
 * This basically means you can use this code however you want for
 * free, but don't claim to have written it yourself!
 * Donations always accepted: http://www.JavascriptToolbox.com/donate/
 * 
 * Please do not link to the .js files on javascripttoolbox.com from
 * your site. Copy the files locally to your server instead.
 * 
 */
/**
 * jquery.contextmenu.js jQuery Plugin for Context Menus http://www.JavascriptToolbox.com/lib/contextmenu/
 * 
 * Copyright (c) 2008 Matt Kruse (javascripttoolbox.com) Dual licensed under the MIT and GPL licenses.
 * 
 * @version 1.1
 * @history 1.1 2010-01-25 Fixed a problem with 1.4 which caused undesired show/hide animations
 * @history 1.0 2008-10-20 Initial Release
 * @todo slideUp doesn't work in IE - because of iframe?
 * @todo Hide all other menus when contextmenu is shown?
 * @todo More themes
 * @todo Nested context menus
 */
;
(function($) {
	$.contextMenu = {
		shadow : true,
		shadowOffset : 0,
		shadowOffsetX : 5,
		shadowOffsetY : 5,
		shadowWidthAdjust : -3,
		shadowHeightAdjust : -3,
		shadowOpacity : .2,
		shadowClass : 'context-menu-shadow',
		shadowColor : 'black',

		offsetX : 0,
		offsetY : 0,
		appendTo : 'body',
		direction : 'down',
		constrainToScreen : true,

		showTransition : 'show',
		hideTransition : 'hide',
		showSpeed : null,
		hideSpeed : null,
		showCallback : null,
		hideCallback : null,

		className : 'context-menu',
		itemClassName : 'context-menu-item',
		itemHoverClassName : 'context-menu-item-hover',
		disabledItemClassName : 'context-menu-item-disabled',
		disabledItemHoverClassName : 'context-menu-item-disabled-hover',
		separatorClassName : 'context-menu-separator',
		innerDivClassName : 'context-menu-item-inner',
		themePrefix : 'context-menu-theme-',
		theme : 'default',

		separator : 'context-menu-separator', // A specific key to identify a separator
		target : null, // The target of the context click, to be populated when triggered
		menu : null, // The jQuery object containing the HTML object that is the menu itself
		shadowObj : null, // Shadow object
		bgiframe : null, // The iframe object for IE6
		shown : false, // Currently being shown?
		useIframe : /* @cc_on @ *//* @if (@_win32) true, @else @ */false,/* @end @ */// This is a better check than
		// looking
		// at userAgent!

		// Create the menu instance
		create : function(menu, opts) {
			var cmenu = $.extend( {}, this, opts); // Clone all default
			// properties to created
			// object

			// If a selector has been passed in, then use that as the menu
			if (typeof menu == "string") {
				cmenu.menu = $(menu);
			}
			// If a function has been passed in, call it each time the menu is shown to create the menu
			else if (typeof menu == "function") {
				cmenu.menuFunction = menu;
			}
			// Otherwise parse the Array passed in
			else {
				cmenu.menu = cmenu.createMenu(menu, cmenu);
			}
			if (cmenu.menu) {
				cmenu.menu.css( {
					display : 'none'
				});
				$(cmenu.appendTo).append(cmenu.menu);
			}

			// Create the shadow object if shadow is enabled
			if (cmenu.shadow) {
				cmenu.createShadow(cmenu); // Extracted to method for
				// extensibility
				if (cmenu.shadowOffset) {
					cmenu.shadowOffsetX = cmenu.shadowOffsetY = cmenu.shadowOffset;
				}
			}
			$('body').bind('contextmenu', function() {
				cmenu.hide();
			}); // If right-clicked somewhere else in the document, hide this
			// menu
			return cmenu;
		},

		// Create an iframe object to go behind the menu
		createIframe : function() {
			return $('<iframe frameborder="0" tabindex="-1" src="javascript:false" style="display:block;position:absolute;z-index:-1;filter:Alpha(Opacity=0);"/>');
		},

		// Accept an Array representing a menu structure and turn it into HTML
		createMenu : function(menu, cmenu) {
			var className = cmenu.className;
			$.each(cmenu.theme.split(","), function(i, n) {
				className += ' ' + cmenu.themePrefix + n
			});
			var $t = $('<table cellspacing=0 cellpadding=0></table>')
				.click(function() {
					cmenu.hide();
					return false;
				}); // We wrap a table around it so width can be flexible
			var $tr = $('<tr></tr>');
			var $td = $('<td></td>');
			var $div = $('<div class="' + className + '"></div>');

			// Each menu item is specified as either:
			// title:function
			// or title: { property:value ... }
			for ( var i = 0; i < menu.length; i++) {
				var m = menu[i];
				if (m == $.contextMenu.separator) {
					$div.append(cmenu.createSeparator());
				} else {
					for ( var opt in menu[i]) {
						$div.append(cmenu.createMenuItem(opt, menu[i][opt])); // Extracted
						// to
						// method
						// for
						// extensibility
					}
				}
			}
			if (cmenu.useIframe) {
				$td.append(cmenu.createIframe());
			}
			$t.append($tr.append($td.append($div)))
			return $t;
		},

		// Create an individual menu item
		createMenuItem : function(label, obj) {
			var cmenu = this;
			if (typeof obj == "function") {
				obj = {
					onclick : obj
				};
			} // If passed a simple function, turn it into a property of an object
			// Default properties, extended in case properties are passed
			var o = $.extend( {
				onclick : function() {
				},
				className : '',
				hoverClassName : cmenu.itemHoverClassName,
				icon : '',
				disabled : false,
				title : '',
				hoverItem : cmenu.hoverItem,
				hoverItemOut : cmenu.hoverItemOut
			}, obj);
			// If an icon is specified, hard-code the background-image style.
			// Themes that don't show images should take this into account in
			// their CSS
			var iconStyle = (o.icon) ? 'background-image:url(' + o.icon + ');' : '';
			var $div = $('<div class="' + cmenu.itemClassName + ' ' +
				o.className +
				((o.disabled) ? ' ' + cmenu.disabledItemClassName : '') +
				'" title="' + o.title + '"></div>')
				// If the item is disabled, don't do anything when it is clicked
				.click(function(e) {
					if (cmenu.isItemDisabled(this)) {
						return false;
					} else {
						return o.onclick.call(cmenu.target, this, cmenu, e)
					}
				})
				// Change the class of the item when hovered over
				.hover(function() {
					o.hoverItem
						.call(this, (cmenu.isItemDisabled(this)) ? cmenu.disabledItemHoverClassName : o.hoverClassName);
				}, function() {
					o.hoverItemOut
						.call(this, (cmenu.isItemDisabled(this)) ? cmenu.disabledItemHoverClassName : o.hoverClassName);
				});
			var $idiv = $('<div class="' + cmenu.innerDivClassName +
				'" style="' + iconStyle + '">' + label + '</div>');
			$div.append($idiv);
			return $div;
		},

		// Create a separator row
		createSeparator : function() {
			return $('<div class="' + this.separatorClassName + '"></div>');
		},

		// Determine if an individual item is currently disabled. This is called each time the item is hovered or
		// clicked because the disabled status may change at any time
		isItemDisabled : function(item) {
			return $(item).is('.' + this.disabledItemClassName);
		},

		// Functions to fire on hover. Extracted to methods for extensibility
		hoverItem : function(c) {
			$(this).addClass(c);
		},
		hoverItemOut : function(c) {
			$(this).removeClass(c);
		},

		// Create the shadow object
		createShadow : function(cmenu) {
			cmenu.shadowObj = $('<div class="' + cmenu.shadowClass + '"></div>')
				.css( {
					display : 'none',
					position : "absolute",
					zIndex : 9998,
					opacity : cmenu.shadowOpacity,
					backgroundColor : cmenu.shadowColor
				});
			$(cmenu.appendTo).append(cmenu.shadowObj);
		},

		// Display the shadow object, given the position of the menu itself
		showShadow : function(x, y, e) {
			var cmenu = this;
			if (cmenu.shadow) {
				cmenu.shadowObj.css( {
					width : (cmenu.menu.width() + cmenu.shadowWidthAdjust) +
						"px",
					height : (cmenu.menu.height() + cmenu.shadowHeightAdjust) +
						"px",
					top : (y + cmenu.shadowOffsetY) + "px",
					left : (x + cmenu.shadowOffsetX) + "px"
				}).addClass(cmenu.shadowClass)[cmenu.showTransition]
					(cmenu.showSpeed);
			}
		},

		// A hook to call before the menu is shown, in case special processing needs to be done.
		// Return false to cancel the default show operation
		beforeShow : function() {
			return true;
		},

		// Show the context menu
		show : function(t, e) {
			var cmenu = this, x = e.pageX, y = e.pageY;
			cmenu.target = t; // Preserve the object that triggered this
			// context menu so menu item click methods can
			// see it
			if (cmenu.beforeShow() !== false) {
				// If the menu content is a function, call it to populate the menu each time it is displayed
				if (cmenu.menuFunction) {
					if (cmenu.menu) {
						$(cmenu.menu).remove();
					}
					cmenu.menu = cmenu
						.createMenu(cmenu.menuFunction(cmenu, t), cmenu);
					cmenu.menu.css( {
						display : 'none'
					});
					$(cmenu.appendTo).append(cmenu.menu);
				}
				var $c = cmenu.menu;
				x += cmenu.offsetX;
				y += cmenu.offsetY;
				var pos = cmenu.getPosition(x, y, cmenu, e); // Extracted to
				// method for
				// extensibility
				cmenu.showShadow(pos.x, pos.y, e);
				// Resize the iframe if needed
				if (cmenu.useIframe) {
					$c.find('iframe').css( {
						width : $c.width() + cmenu.shadowOffsetX +
							cmenu.shadowWidthAdjust,
						height : $c.height() + cmenu.shadowOffsetY +
							cmenu.shadowHeightAdjust
					});
				}
				$c.css( {
					top : pos.y + "px",
					left : pos.x + "px",
					position : "absolute",
					zIndex : 9999
				})[cmenu.showTransition]
					(cmenu.showSpeed, ((cmenu.showCallback) ? function() {
						cmenu.showCallback.call(cmenu);
					} : null));
				cmenu.shown = true;
				$(document).one('click', null, function() {
					cmenu.hide()
				}); // Handle a single click to the document to hide the menu
			}
		},

		// Find the position where the menu should appear, given an x,y of the click event
		getPosition : function(clickX, clickY, cmenu, e) {
			var x = clickX + cmenu.offsetX;
			var y = clickY + cmenu.offsetY
			var h = $(cmenu.menu).height();
			var w = $(cmenu.menu).width();
			var dir = cmenu.direction;
			if (cmenu.constrainToScreen) {
				var $w = $(window);
				var wh = $w.height();
				var ww = $w.width();
				if (dir == "down" && (y + h - $w.scrollTop() > wh)) {
					dir = "up";
				}
				var maxRight = x + w - $w.scrollLeft();
				if (maxRight > ww) {
					x -= (maxRight - ww);
				}
			}
			if (dir == "up") {
				y -= h;
			}
			return {
				'x' : x, 'y' : y
			};
		},

		// Hide the menu, of course
		hide : function() {
			var cmenu = this;
			if (cmenu.shown) {
				if (cmenu.iframe) {
					$(cmenu.iframe).hide();
				}
				if (cmenu.menu) {
					cmenu.menu[cmenu.hideTransition]
						(cmenu.hideSpeed, ((cmenu.hideCallback) ? function() {
							cmenu.hideCallback.call(cmenu);
						} : null));
				}
				if (cmenu.shadow) {
					cmenu.shadowObj[cmenu.hideTransition](cmenu.hideSpeed);
				}
			}
			cmenu.shown = false;
		}
	};

	// This actually adds the .contextMenu() function to the jQuery namespace
	$.fn.contextMenu = function(menu, options) {
		var cmenu = $.contextMenu.create(menu, options);
		return this.each(function() {
			// Show menu on left click
			$(this).bind('click', function(e) {
				cmenu.show(this, e);
				return false;
			});
		});
	};
})(jQuery);