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diff --git a/src/js/util/mxMouseEvent.js b/src/js/util/mxMouseEvent.js
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+/**
+ * $Id: mxMouseEvent.js,v 1.20 2011-03-02 17:24:39 gaudenz Exp $
+ * Copyright (c) 2006-2010, JGraph Ltd
+ */
+/**
+ * Class: mxMouseEvent
+ * 
+ * Base class for all mouse events in mxGraph. A listener for this event should
+ * implement the following methods:
+ * 
+ * (code)
+ * graph.addMouseListener(
+ * {
+ *   mouseDown: function(sender, evt)
+ *   {
+ *     mxLog.debug('mouseDown');
+ *   },
+ *   mouseMove: function(sender, evt)
+ *   {
+ *     mxLog.debug('mouseMove');
+ *   },
+ *   mouseUp: function(sender, evt)
+ *   {
+ *     mxLog.debug('mouseUp');
+ *   }
+ * });
+ * (end)
+ * 
+ * Constructor: mxMouseEvent
+ *
+ * Constructs a new event object for the given arguments.
+ * 
+ * Parameters:
+ * 
+ * evt - Native mouse event.
+ * state - Optional <mxCellState> under the mouse.
+ * 
+ */
+function mxMouseEvent(evt, state)
+{
+	this.evt = evt;
+	this.state = state;
+};
+
+/**
+ * Variable: consumed
+ *
+ * Holds the consumed state of this event.
+ */
+mxMouseEvent.prototype.consumed = false;
+
+/**
+ * Variable: evt
+ *
+ * Holds the inner event object.
+ */
+mxMouseEvent.prototype.evt = null;
+
+/**
+ * Variable: graphX
+ *
+ * Holds the x-coordinate of the event in the graph. This value is set in
+ * <mxGraph.fireMouseEvent>.
+ */
+mxMouseEvent.prototype.graphX = null;
+
+/**
+ * Variable: graphY
+ *
+ * Holds the y-coordinate of the event in the graph. This value is set in
+ * <mxGraph.fireMouseEvent>.
+ */
+mxMouseEvent.prototype.graphY = null;
+
+/**
+ * Variable: state
+ *
+ * Holds the optional <mxCellState> associated with this event.
+ */
+mxMouseEvent.prototype.state = null;
+
+/**
+ * Function: getEvent
+ * 
+ * Returns <evt>.
+ */
+mxMouseEvent.prototype.getEvent = function()
+{
+	return this.evt;
+};
+
+/**
+ * Function: getSource
+ * 
+ * Returns the target DOM element using <mxEvent.getSource> for <evt>.
+ */
+mxMouseEvent.prototype.getSource = function()
+{
+	return mxEvent.getSource(this.evt);
+};
+
+/**
+ * Function: isSource
+ * 
+ * Returns true if the given <mxShape> is the source of <evt>.
+ */
+mxMouseEvent.prototype.isSource = function(shape)
+{
+	if (shape != null)
+	{
+		var source = this.getSource();
+		
+		while (source != null)
+		{
+			if (source == shape.node)
+			{
+				return true;
+			}
+	
+			source = source.parentNode;
+		}
+	}
+	
+	return false;
+};
+
+/**
+ * Function: getX
+ * 
+ * Returns <evt.clientX>.
+ */
+mxMouseEvent.prototype.getX = function()
+{
+	return mxEvent.getClientX(this.getEvent());
+};
+
+/**
+ * Function: getY
+ * 
+ * Returns <evt.clientY>.
+ */
+mxMouseEvent.prototype.getY = function()
+{
+	return mxEvent.getClientY(this.getEvent());
+};
+
+/**
+ * Function: getGraphX
+ * 
+ * Returns <graphX>.
+ */
+mxMouseEvent.prototype.getGraphX = function()
+{
+	return this.graphX;
+};
+
+/**
+ * Function: getGraphY
+ * 
+ * Returns <graphY>.
+ */
+mxMouseEvent.prototype.getGraphY = function()
+{
+	return this.graphY;
+};
+
+/**
+ * Function: getState
+ * 
+ * Returns <state>.
+ */
+mxMouseEvent.prototype.getState = function()
+{
+	return this.state;
+};
+
+/**
+ * Function: getCell
+ * 
+ * Returns the <mxCell> in <state> is not null.
+ */
+mxMouseEvent.prototype.getCell = function()
+{
+	var state = this.getState();
+	
+	if (state != null)
+	{
+		return state.cell;
+	}
+	
+	return null;
+};
+
+/**
+ * Function: isPopupTrigger
+ *
+ * Returns true if the event is a popup trigger.
+ */
+mxMouseEvent.prototype.isPopupTrigger = function()
+{
+	return mxEvent.isPopupTrigger(this.getEvent());
+};
+
+/**
+ * Function: isConsumed
+ *
+ * Returns <consumed>.
+ */
+mxMouseEvent.prototype.isConsumed = function()
+{
+	return this.consumed;
+};
+
+/**
+ * Function: consume
+ *
+ * Sets <consumed> to true and invokes preventDefault on the native event
+ * if such a method is defined. This is used mainly to avoid the cursor from
+ * being changed to a text cursor in Webkit. You can use the preventDefault
+ * flag to disable this functionality.
+ * 
+ * Parameters:
+ * 
+ * preventDefault - Specifies if the native event should be canceled. Default
+ * is true.
+ */
+mxMouseEvent.prototype.consume = function(preventDefault)
+{
+	preventDefault = (preventDefault != null) ? preventDefault : true;
+	
+	if (preventDefault && this.evt.preventDefault)
+	{
+		this.evt.preventDefault();
+	}
+
+	// Workaround for images being dragged in IE
+	this.evt.returnValue = false;
+	
+	// Sets local consumed state
+	this.consumed = true;
+};