/**
*
*  Simple Context Menu
*  http://www.webtoolkit.info/
*
**/

var SimpleContextMenu = {

	// private attributes
	_menus : new Array,
	_attachedElement : null,
	_menuElement : null,
	_preventDefault : true,
	_preventForms : true,


	// public method. Sets up whole context menu stuff..
	setup : function (conf) {

		if ( document.all && document.getElementById && !window.opera ) {
			SimpleContextMenu.IE = true;
		}

		if ( !document.all && document.getElementById && !window.opera ) {
			SimpleContextMenu.FF = true;
		}

		if ( document.all && document.getElementById && window.opera ) {
			SimpleContextMenu.OP = true;
		}

		if ( SimpleContextMenu.IE || SimpleContextMenu.FF ) {

			document.oncontextmenu = SimpleContextMenu._show;
			document.onclick = SimpleContextMenu._hide;

			if (conf && typeof(conf.preventDefault) != "undefined") {
				SimpleContextMenu._preventDefault = conf.preventDefault;
			}

			if (conf && typeof(conf.preventForms) != "undefined") {
				SimpleContextMenu._preventForms = conf.preventForms;
			}

		}

	},


	// public method. Attaches context menus to specific class names
	attach : function (classNames, menuId) {

		if (typeof(classNames) == "string") {
			SimpleContextMenu._menus[classNames] = menuId;
		}

		if (typeof(classNames) == "object") {
			for (x = 0; x < classNames.length; x++) {
				SimpleContextMenu._menus[classNames[x]] = menuId;
			}
		}

	},


	// private method. Get which context menu to show
	_getMenuElementId : function (e) {

		if (SimpleContextMenu.IE) {
			SimpleContextMenu._attachedElement = event.srcElement;
		} else {
			SimpleContextMenu._attachedElement = e.target;
		}

		while(SimpleContextMenu._attachedElement != null) {
			var className = SimpleContextMenu._attachedElement.className;

			if (typeof(className) != "undefined") {
				className = className.replace(/^\s+/g, "").replace(/\s+$/g, "")
				var classArray = className.split(/[ ]+/g);

				for (i = 0; i < classArray.length; i++) {
					if (SimpleContextMenu._menus[classArray[i]]) {
						return SimpleContextMenu._menus[classArray[i]];
					}
				}
			}

			if (SimpleContextMenu.IE) {
				SimpleContextMenu._attachedElement = SimpleContextMenu._attachedElement.parentElement;
			} else {
				SimpleContextMenu._attachedElement = SimpleContextMenu._attachedElement.parentNode;
			}
		}

		return null;

	},


	// private method. Shows context menu
	_getReturnValue : function (e) {

		var returnValue = true;
		var evt = SimpleContextMenu.IE ? window.event : e;

		if (evt.button != 1) {
			if (evt.target) {
				var el = evt.target;
			} else if (evt.srcElement) {
				var el = evt.srcElement;
			}

			var tname = el.tagName.toLowerCase();

			if ((tname == "input" || tname == "textarea")) {
				if (!SimpleContextMenu._preventForms) {
					returnValue = true;
				} else {
					returnValue = false;
				}
			} else {
				if (!SimpleContextMenu._preventDefault) {
					returnValue = true;
				} else {
					returnValue = false;
				}
			}
		}

		return returnValue;

	},


	// private method. Shows context menu
	_show : function (e) {

		SimpleContextMenu._hide();
		var menuElementId = SimpleContextMenu._getMenuElementId(e);

		if (menuElementId) {
			var position = SimpleContextMenu._getMousePosition(e);
			SimpleContextMenu._menuElement = document.getElementById(menuElementId);
			SimpleContextMenu._menuElement.style.left = position.x + 'px';
			SimpleContextMenu._menuElement.style.top = position.y + 'px';
			SimpleContextMenu._menuElement.style.display = 'block';
			return false;
		}

		return SimpleContextMenu._getReturnValue(e);

	},


	// private method. Hides context menu
	_hide : function () {

		if (SimpleContextMenu._menuElement) {
			SimpleContextMenu._menuElement.style.display = 'none';
		}

	},


	// private method. Returns mouse position
	_getMousePosition : function (e) {

		if (SimpleContextMenu.IE) {
			if (document.documentElement.scrollTop) {
				var scrollTop = document.documentElement.scrollTop;
				var scrollLeft = document.documentElement.scrollLeft;
			} else {
				var scrollTop = document.body.scrollTop;
				var scrollLeft = document.body.scrollLeft;
			}
		}

		if (SimpleContextMenu.FF) {
			var scrollTop = window.pageYOffset;
			var scrollLeft = window.pageXOffset;
		}

		var evt = SimpleContextMenu.IE ? window.event : e;
		var mX = scrollTop + evt.clientX;
		var mY = scrollLeft + evt.clientY;

		return { 'x' : mX, 'y' : mY };

	}

}