+/*
+ * A number of helper functions used for managing events.
+ * Many of the ideas behind this code orignated from
+ * Dean Edwards' addEvent library.
+ */
+jQuery.event = {
+
+ // Bind an event to an element
+ // Original by Dean Edwards
+ add: function(element, type, handler, data) {
+ // For whatever reason, IE has trouble passing the window object
+ // around, causing it to be cloned in the process
+ if ( jQuery.browser.msie && element.setInterval != undefined )
+ element = window;
+
+ // if data is passed, bind to handler
+ if( data )
+ handler.data = data;
+
+ // Make sure that the function being executed has a unique ID
+ if ( !handler.guid )
+ handler.guid = this.guid++;
+
+ // Init the element's event structure
+ if (!element.events)
+ element.events = {};
+
+ // Get the current list of functions bound to this event
+ var handlers = element.events[type];
+
+ // If it hasn't been initialized yet
+ if (!handlers) {
+ // Init the event handler queue
+ handlers = element.events[type] = {};
+
+ // Remember an existing handler, if it's already there
+ if (element["on" + type])
+ handlers[0] = element["on" + type];
+ }
+
+ // Add the function to the element's handler list
+ handlers[handler.guid] = handler;
+
+ // And bind the global event handler to the element
+ element["on" + type] = this.handle;
+
+ // Remember the function in a global list (for triggering)
+ if (!this.global[type])
+ this.global[type] = [];
+ this.global[type].push( element );
+ },
+
+ guid: 1,
+ global: {},
+
+ // Detach an event or set of events from an element
+ remove: function(element, type, handler) {
+ if (element.events)
+ if ( type && type.type )
+ delete element.events[ type.type ][ type.handler.guid ];
+ else if (type && element.events[type])
+ if ( handler )
+ delete element.events[type][handler.guid];
+ else
+ for ( var i in element.events[type] )
+ delete element.events[type][i];
+ else
+ for ( var j in element.events )
+ this.remove( element, j );
+ },
+
+ trigger: function(type,data,element) {
+ // Clone the incoming data, if any
+ data = jQuery.makeArray(data || []);
+
+ // Handle a global trigger
+ if ( !element ) {
+ var g = this.global[type];
+ if ( g )
+ for ( var i = 0, gl = g.length; i < gl; i++ )
+ this.trigger( type, data, g[i] );
+
+ // Handle triggering a single element
+ } else if ( element["on" + type] ) {
+ // Pass along a fake event
+ data.unshift( this.fix({ type: type, target: element }) );
+
+ // Trigger the event
+ element["on" + type].apply( element, data );
+ }
+ },
+
+ handle: function(event) {
+ if ( typeof jQuery == "undefined" ) return false;
+
+ event = jQuery.event.fix( event || window.event || {} ); // Empty object is for triggered events with no data
+
+ // returned undefined or false
+ var returnValue;
+
+ var c = this.events[event.type];
+
+ var args = [].slice.call( arguments, 1 );
+ args.unshift( event );
+
+ for ( var j in c ) {
+ // Pass in a reference to the handler function itself
+ // So that we can later remove it
+ args[0].handler = c[j];
+ args[0].data = c[j].data;
+
+ if ( c[j].apply( this, args ) === false ) {
+ event.preventDefault();
+ event.stopPropagation();
+ returnValue = false;
+ }
+ }
+
+ // Clean up added properties in IE to prevent memory leak
+ if (jQuery.browser.msie) event.target = event.preventDefault = event.stopPropagation = event.handler = event.data = null;
+
+ return returnValue;
+ },
+
+ fix: function(event) {
+ // Fix target property, if necessary
+ if ( !event.target && event.srcElement )
+ event.target = event.srcElement;
+
+ // Calculate pageX/Y if missing and clientX/Y available
+ if ( typeof event.pageX == "undefined" && typeof event.clientX != "undefined" ) {
+ var e = document.documentElement, b = document.body;
+ event.pageX = event.clientX + (e.scrollLeft || b.scrollLeft);
+ event.pageY = event.clientY + (e.scrollTop || b.scrollTop);
+ }
+
+ // Check safari and if target is a textnode
+ if ( jQuery.browser.safari && event.target.nodeType == 3 ) {
+ // target is readonly, clone the event object
+ event = jQuery.extend({}, event);
+ // get parentnode from textnode
+ event.target = event.target.parentNode;
+ }
+
+ // fix preventDefault and stopPropagation
+ if (!event.preventDefault) {
+ event.preventDefault = function() {
+ this.returnValue = false;
+ };
+ }
+
+ if (!event.stopPropagation) {
+ event.stopPropagation = function() {
+ this.cancelBubble = true;
+ };
+ }
+
+ return event;
+ }
+};
+