drawio/src/main/webapp/js/mxgraph/Graph.js

/**
 * Copyright (c) 2006-2012, JGraph Ltd
 */
// Workaround for allowing target="_blank" in HTML sanitizer
// see https://code.google.com/p/google-caja/issues/detail?can=2&q=&colspec=ID%20Type%20Status%20Priority%20Owner%20Summary&groupby=&sort=&id=1296
if (typeof html4 !== 'undefined')
{
	html4.ATTRIBS["a::target"] = 0;
	html4.ATTRIBS["source::src"] = 0;
	html4.ATTRIBS["video::src"] = 0;
	// Would be nice for tooltips but probably a security risk...
	//html4.ATTRIBS["video::autoplay"] = 0;
	//html4.ATTRIBS["video::autobuffer"] = 0;
}

/**
 * Sets global constants.
 */
// Changes default colors
mxConstants.SHADOW_OPACITY = 0.25;
mxConstants.SHADOWCOLOR = '#000000';
mxConstants.VML_SHADOWCOLOR = '#d0d0d0';
mxGraph.prototype.pageBreakColor = '#c0c0c0';
mxGraph.prototype.pageScale = 1;

// Letter page format is default in US, Canada and Mexico
(function()
{
	try
	{
		if (navigator != null && navigator.language != null)
		{
			var lang = navigator.language.toLowerCase();
			mxGraph.prototype.pageFormat = (lang === 'en-us' || lang === 'en-ca' || lang === 'es-mx') ?
				mxConstants.PAGE_FORMAT_LETTER_PORTRAIT : mxConstants.PAGE_FORMAT_A4_PORTRAIT;
		}
	}
	catch (e)
	{
		// ignore
	}
})();

// Matches label positions of mxGraph 1.x
mxText.prototype.baseSpacingTop = 5;
mxText.prototype.baseSpacingBottom = 1;

// Keeps edges between relative child cells inside parent
mxGraphModel.prototype.ignoreRelativeEdgeParent = false;

// Defines grid properties
mxGraphView.prototype.gridImage = (mxClient.IS_SVG) ? 'data:image/gif;base64,R0lGODlhCgAKAJEAAAAAAP///8zMzP///yH5BAEAAAMALAAAAAAKAAoAAAIJ1I6py+0Po2wFADs=' :
	IMAGE_PATH + '/grid.gif';
mxGraphView.prototype.gridSteps = 4;
mxGraphView.prototype.minGridSize = 4;

// UrlParams is null in embed mode
mxGraphView.prototype.gridColor = '#e0e0e0';

// Alternative text for unsupported foreignObjects
mxSvgCanvas2D.prototype.foAltText = '[Not supported by viewer]';

/**
 * Constructs a new graph instance. Note that the constructor does not take a
 * container because the graph instance is needed for creating the UI, which
 * in turn will create the container for the graph. Hence, the container is
 * assigned later in EditorUi.
 */
/**
 * Defines graph class.
 */
Graph = function(container, model, renderHint, stylesheet, themes)
{
	mxGraph.call(this, container, model, renderHint, stylesheet);
	
	this.themes = themes || this.defaultThemes;
	this.currentEdgeStyle = mxUtils.clone(this.defaultEdgeStyle);
	this.currentVertexStyle = mxUtils.clone(this.defaultVertexStyle);

	// Sets the base domain URL and domain path URL for relative links.
	var b = this.baseUrl;
	var p = b.indexOf('//');
	this.domainUrl = '';
	this.domainPathUrl = '';
	
	if (p > 0)
	{
		var d = b.indexOf('/', p + 2);

		if (d > 0)
		{
			this.domainUrl = b.substring(0, d);
		}
		
		d = b.lastIndexOf('/');
		
		if (d > 0)
		{
			this.domainPathUrl = b.substring(0, d + 1);
		}
	}
	
    // Adds support for HTML labels via style. Note: Currently, only the Java
    // backend supports HTML labels but CSS support is limited to the following:
    // http://docs.oracle.com/javase/6/docs/api/index.html?javax/swing/text/html/CSS.html
	// TODO: Wrap should not affect isHtmlLabel output (should be handled later)
	this.isHtmlLabel = function(cell)
	{
		var state = this.view.getState(cell);
		var style = (state != null) ? state.style : this.getCellStyle(cell);
		
		return style['html'] == '1' || style[mxConstants.STYLE_WHITE_SPACE] == 'wrap';
	};
	
	// Implements a listener for hover and click handling on edges
	if (this.edgeMode)
	{
		var start = {
			point: null,
			event: null,
			state: null,
			handle: null,
			selected: false
		};
		
		// Uses this event to process mouseDown to check the selection state before it is changed
		this.addListener(mxEvent.FIRE_MOUSE_EVENT, mxUtils.bind(this, function(sender, evt)
		{
			if (evt.getProperty('eventName') == 'mouseDown' && this.isEnabled())
			{
				var me = evt.getProperty('event');
				
				if (!mxEvent.isControlDown(me.getEvent()) && !mxEvent.isShiftDown(me.getEvent()))
		    	{
			    	var state = me.getState();
		
			    	if (state != null)
			    	{
			    		// Checks if state was removed in call to stopEditing above
			    		if (this.model.isEdge(state.cell))
			    		{
			    			start.point = new mxPoint(me.getGraphX(), me.getGraphY());
			    			start.selected = this.isCellSelected(state.cell);
			    			start.state = state;
			    			start.event = me;
			    			
	    					if (state.text != null && state.text.boundingBox != null &&
	    						mxUtils.contains(state.text.boundingBox, me.getGraphX(), me.getGraphY()))
	    					{
	    						start.handle = mxEvent.LABEL_HANDLE;
	    					}
	    					else
	    					{
				    			var handler = this.selectionCellsHandler.getHandler(state.cell);
	
				    			if (handler != null && handler.bends != null && handler.bends.length > 0)
				    			{
				    				start.handle = handler.getHandleForEvent(me);
				    			}
	    					}
			    		}
			    	}
		    	}
			}
		}));
		
		var mouseDown = null;
		
		this.addMouseListener(
		{
			mouseDown: function(sender, me) {},
		    mouseMove: mxUtils.bind(this, function(sender, me)
		    {
		    	// Checks if any other handler is active
		    	var handlerMap = this.selectionCellsHandler.handlers.map;
		    	
		    	for (var key in handlerMap)
		    	{
		    		if (handlerMap[key].index != null)
		    		{
		    			return;
		    		}
		    	}
		    	
		    	if (this.isEnabled() && !this.panningHandler.isActive() && !mxEvent.isControlDown(me.getEvent()) &&
		    		!mxEvent.isShiftDown(me.getEvent()) && !mxEvent.isAltDown(me.getEvent()))
		    	{
		    		var tol = this.tolerance;
	
			    	if (start.point != null && start.state != null && start.event != null)
			    	{
			    		var state = start.state;
			    		
			    		if (Math.abs(start.point.x - me.getGraphX()) > tol ||
			    			Math.abs(start.point.y - me.getGraphY()) > tol)
			    		{
			    			// Lazy selection for edges inside groups
			    			if (!this.isCellSelected(state.cell))
			    			{
			    				this.setSelectionCell(state.cell);
			    			}
			    			
			    			var handler = this.selectionCellsHandler.getHandler(state.cell);
			    			
			    			if (handler != null && handler.bends != null && handler.bends.length > 0)
			    			{
			    				var handle = handler.getHandleForEvent(start.event);
			    				var edgeStyle = this.view.getEdgeStyle(state);
			    				var entity = edgeStyle == mxEdgeStyle.EntityRelation;
			    				
			    				// Handles special case where label was clicked on unselected edge in which
			    				// case the label will be moved regardless of the handle that is returned
			    				if (!start.selected && start.handle == mxEvent.LABEL_HANDLE)
			    				{
			    					handle = start.handle;
			    				}
			    				
	    						if (!entity || handle == 0 || handle == handler.bends.length - 1 || handle == mxEvent.LABEL_HANDLE)
	    						{
				    				// Source or target handle or connected for direct handle access or orthogonal line
				    				// with just two points where the central handle is moved regardless of mouse position
				    				if (handle == mxEvent.LABEL_HANDLE || handle == 0 || state.visibleSourceState != null ||
				    					handle == handler.bends.length - 1 || state.visibleTargetState != null)
				    				{
				    					if (!entity && handle != mxEvent.LABEL_HANDLE)
				    					{
					    					var pts = state.absolutePoints;
				    						
					    					// Default case where handles are at corner points handles
					    					// drag of corner as drag of existing point
					    					if (pts != null && ((edgeStyle == null && handle == null) ||
					    						edgeStyle == mxEdgeStyle.OrthConnector))
					    					{
					    						// Does not use handles if they were not initially visible
					    						handle = start.handle;

					    						if (handle == null)
					    						{
							    					var box = new mxRectangle(start.point.x, start.point.y);
							    					box.grow(mxEdgeHandler.prototype.handleImage.width / 2);
							    					
					    							if (mxUtils.contains(box, pts[0].x, pts[0].y))
					    							{
						    							// Moves source terminal handle
					    								handle = 0;
					    							}
					    							else if (mxUtils.contains(box, pts[pts.length - 1].x, pts[pts.length - 1].y))
					    							{
					    								// Moves target terminal handle
					    								handle = handler.bends.length - 1;
					    							}
					    							else
					    							{
							    						// Checks if edge has no bends
							    						var nobends = edgeStyle != null && (pts.length == 2 || (pts.length == 3 &&
						    								((Math.round(pts[0].x - pts[1].x) == 0 && Math.round(pts[1].x - pts[2].x) == 0) ||
						    								(Math.round(pts[0].y - pts[1].y) == 0 && Math.round(pts[1].y - pts[2].y) == 0))));
							    						
						    							if (nobends)
								    					{
									    					// Moves central handle for straight orthogonal edges
								    						handle = 2;
								    					}
								    					else
									    				{
										    				// Finds and moves vertical or horizontal segment
									    					handle = mxUtils.findNearestSegment(state, start.point.x, start.point.y);
									    					
									    					// Converts segment to virtual handle index
									    					if (edgeStyle == null)
									    					{
									    						handle = mxEvent.VIRTUAL_HANDLE - handle;
									    					}
									    					// Maps segment to handle
									    					else
									    					{
									    						handle += 1;
									    					}
									    				}
					    							}
					    						}
					    					}
							    			
						    				// Creates a new waypoint and starts moving it
						    				if (handle == null)
						    				{
						    					handle = mxEvent.VIRTUAL_HANDLE;
						    				}
				    					}
					    				
				    					handler.start(me.getGraphX(), me.getGraphX(), handle);
				    					start.state = null;
				    					start.event = null;
				    					start.point = null;
				    					start.handle = null;
				    					start.selected = false;
				    					me.consume();
	
				    					// Removes preview rectangle in graph handler
				    					this.graphHandler.reset();
				    				}
	    						}
	    						else if (entity && (state.visibleSourceState != null || state.visibleTargetState != null))
	    						{
	    							// Disables moves on entity to make it consistent
			    					this.graphHandler.reset();
	    							me.consume();
	    						}
			    			}
			    		}
			    	}
			    	else
			    	{
			    		// Updates cursor for unselected edges under the mouse
				    	var state = me.getState();
				    	
				    	if (state != null)
				    	{
				    		// Checks if state was removed in call to stopEditing above
				    		if (this.model.isEdge(state.cell))
				    		{
				    			var cursor = null;
			    				var pts = state.absolutePoints;
			    				
			    				if (pts != null)
			    				{
			    					var box = new mxRectangle(me.getGraphX(), me.getGraphY());
			    					box.grow(mxEdgeHandler.prototype.handleImage.width / 2);
			    					
			    					if (state.text != null && state.text.boundingBox != null &&
			    						mxUtils.contains(state.text.boundingBox, me.getGraphX(), me.getGraphY()))
			    					{
			    						cursor = 'move';
			    					}
			    					else if (mxUtils.contains(box, pts[0].x, pts[0].y) ||
			    						mxUtils.contains(box, pts[pts.length - 1].x, pts[pts.length - 1].y))
			    					{
			    						cursor = 'pointer';
			    					}
			    					else if (state.visibleSourceState != null || state.visibleTargetState != null)
			    					{
		    							// Moving is not allowed for entity relation but still indicate hover state
			    						var tmp = this.view.getEdgeStyle(state);
			    						cursor = 'crosshair';
			    						
			    						if (tmp != mxEdgeStyle.EntityRelation && this.isOrthogonal(state))
						    			{
						    				var idx = mxUtils.findNearestSegment(state, me.getGraphX(), me.getGraphY());
						    				
						    				if (idx < pts.length - 1 && idx >= 0)
						    				{
					    						cursor = (Math.round(pts[idx].x - pts[idx + 1].x) == 0) ?
					    							'col-resize' : 'row-resize';
						    				}
						    			}
			    					}
			    				}
			    				
			    				if (cursor != null)
			    				{
			    					state.setCursor(cursor);
			    				}
				    		}
				    	}
			    	}
		    	}
		    }),
		    mouseUp: mxUtils.bind(this, function(sender, me)
		    {
				start.state = null;
				start.event = null;
				start.point = null;
				start.handle = null;
		    })
		});
	}
	
	// HTML entities are displayed as plain text in wrapped plain text labels
	this.cellRenderer.getLabelValue = function(state)
	{
		var result = mxCellRenderer.prototype.getLabelValue.apply(this, arguments);
		
		if (state.view.graph.isHtmlLabel(state.cell))
		{
			if (state.style['html'] != 1)
			{
				result = mxUtils.htmlEntities(result, false);
			}
			else
			{
				result = state.view.graph.sanitizeHtml(result);
			}
		}
		
		return result;
	};

	// All code below not available and not needed in embed mode
	if (typeof mxVertexHandler !== 'undefined')
	{
		this.setConnectable(true);
		this.setDropEnabled(true);
		this.setPanning(true);
		this.setTooltips(true);
		this.setAllowLoops(true);
		this.allowAutoPanning = true;
		this.resetEdgesOnConnect = false;
		this.constrainChildren = false;
		this.constrainRelativeChildren = true;
		
		// Do not scroll after moving cells
		this.graphHandler.scrollOnMove = false;
		this.graphHandler.scaleGrid = true;

		// Disables cloning of connection sources by default
		this.connectionHandler.setCreateTarget(false);
		this.connectionHandler.insertBeforeSource = true;
		
		// Disables built-in connection starts
		this.connectionHandler.isValidSource = function(cell, me)
		{
			return false;
		};

		// Sets the style to be used when an elbow edge is double clicked
		this.alternateEdgeStyle = 'vertical';

		if (stylesheet == null)
		{
			this.loadStylesheet();
		}

		// Adds page centers to the guides for moving cells
		var graphHandlerGetGuideStates = this.graphHandler.getGuideStates;
		this.graphHandler.getGuideStates = function()
		{
			var result = graphHandlerGetGuideStates.apply(this, arguments);
			
			// Create virtual cell state for page centers
			if (this.graph.pageVisible)
			{
				var guides = [];
				
				var pf = this.graph.pageFormat;
				var ps = this.graph.pageScale;
				var pw = pf.width * ps;
				var ph = pf.height * ps;
				var t = this.graph.view.translate;
				var s = this.graph.view.scale;

				var layout = this.graph.getPageLayout();
				
				for (var i = 0; i < layout.width; i++)
				{
					guides.push(new mxRectangle(((layout.x + i) * pw + t.x) * s,
						(layout.y * ph + t.y) * s, pw * s, ph * s));
				}
				
				for (var j = 0; j < layout.height; j++)
				{
					guides.push(new mxRectangle((layout.x * pw + t.x) * s,
						((layout.y + j) * ph + t.y) * s, pw * s, ph * s));
				}
				
				// Page center guides have predence over normal guides
				result = guides.concat(result);
			}
			
			return result;
		};

		// Overrides zIndex for dragElement
		mxDragSource.prototype.dragElementZIndex = mxPopupMenu.prototype.zIndex;
		
		// Overrides color for virtual guides for page centers
		mxGuide.prototype.getGuideColor = function(state, horizontal)
		{
			return (state.cell == null) ? '#ffa500' /* orange */ : mxConstants.GUIDE_COLOR;
		};

		// Changes color of move preview for black backgrounds
		this.graphHandler.createPreviewShape = function(bounds)
		{
			this.previewColor = (this.graph.background == '#000000') ? '#ffffff' : mxGraphHandler.prototype.previewColor;
			
			return mxGraphHandler.prototype.createPreviewShape.apply(this, arguments);
		};
		
		// Handles parts of cells by checking if part=1 is in the style and returning the parent
		// if the parent is not already in the list of cells. container style is used to disable
		// step into swimlanes and dropTarget style is used to disable acting as a drop target.
		// LATER: Handle recursive parts
		this.graphHandler.getCells = function(initialCell)
		{
		    var cells = mxGraphHandler.prototype.getCells.apply(this, arguments);
		    var newCells = [];

		    for (var i = 0; i < cells.length; i++)
		    {
				var state = this.graph.view.getState(cells[i]);
				var style = (state != null) ? state.style : this.graph.getCellStyle(cells[i]);
		    	
				if (mxUtils.getValue(style, 'part', '0') == '1')
				{
			        var parent = this.graph.model.getParent(cells[i]);
		
			        if (this.graph.model.isVertex(parent) && mxUtils.indexOf(cells, parent) < 0)
			        {
			            newCells.push(parent);
			        }
				}
				else
				{
					newCells.push(cells[i]);
				}
		    }

		    return newCells;
		};

		// Handles parts of cells when cloning the source for new connections
		this.connectionHandler.createTargetVertex = function(evt, source)
		{
			var state = this.graph.view.getState(source);
			var style = (state != null) ? state.style : this.graph.getCellStyle(source);
	    	
			if (mxUtils.getValue(style, 'part', false))
			{
				var parent = this.graph.model.getParent(source);

				if (this.graph.model.isVertex(parent))
				{
					source = parent;
				}
			}
			
			return mxConnectionHandler.prototype.createTargetVertex.apply(this, arguments);
		};
		
	    var rubberband = new mxRubberband(this);
	    
	    this.getRubberband = function()
	    {
	    		return rubberband;
	    };
	    
	    // Timer-based activation of outline connect in connection handler
	    var startTime = new Date().getTime();
	    var timeOnTarget = 0;
	    
	    var connectionHandlerMouseMove = this.connectionHandler.mouseMove;
	    
	    this.connectionHandler.mouseMove = function()
	    {
		    	var prev = this.currentState;
		    	connectionHandlerMouseMove.apply(this, arguments);
		    	
		    	if (prev != this.currentState)
		    	{
		    		startTime = new Date().getTime();
		    		timeOnTarget = 0;
		    	}
		    	else
		    	{
			    	timeOnTarget = new Date().getTime() - startTime;
		    	}
	    };

	    // Activates outline connect after 1500ms with touch event or if alt is pressed inside the shape
	    var connectionHandleIsOutlineConnectEvent = this.connectionHandler.isOutlineConnectEvent;
	    
	    this.connectionHandler.isOutlineConnectEvent = function(me)
	    {
		    	return (this.currentState != null && me.getState() == this.currentState && timeOnTarget > 2000) ||
		    		((this.currentState == null || mxUtils.getValue(this.currentState.style, 'outlineConnect', '1') != '0') &&
		    		connectionHandleIsOutlineConnectEvent.apply(this, arguments));
	    };
	    
	    // Adds shift+click to toggle selection state
	    var isToggleEvent = this.isToggleEvent;
	    this.isToggleEvent = function(evt)
	    {
	    		return isToggleEvent.apply(this, arguments) || mxEvent.isShiftDown(evt);
	    };
	    
	    // Workaround for Firefox where first mouse down is received
	    // after tap and hold if scrollbars are visible, which means
	    // start rubberband immediately if no cell is under mouse.
	    var isForceRubberBandEvent = rubberband.isForceRubberbandEvent;
	    rubberband.isForceRubberbandEvent = function(me)
	    {
		    	return isForceRubberBandEvent.apply(this, arguments) ||
		    		(mxUtils.hasScrollbars(this.graph.container) && mxClient.IS_FF &&
		    		mxClient.IS_WIN && me.getState() == null && mxEvent.isTouchEvent(me.getEvent()));
	    };
	    
	    // Shows hand cursor while panning
	    var prevCursor = null;
	    
		this.panningHandler.addListener(mxEvent.PAN_START, mxUtils.bind(this, function()
		{
			if (this.isEnabled())
			{
				prevCursor = this.container.style.cursor;
				this.container.style.cursor = 'move';
			}
		}));
			
		this.panningHandler.addListener(mxEvent.PAN_END, mxUtils.bind(this, function()
		{
			if (this.isEnabled())
			{
				this.container.style.cursor = prevCursor;
			}
		}));

		this.popupMenuHandler.autoExpand = true;
		
		this.popupMenuHandler.isSelectOnPopup = function(me)
		{
			return mxEvent.isMouseEvent(me.getEvent());
		};
	
		// Enables links if graph is "disabled" (ie. read-only)
		var click = this.click;
		this.click = function(me)
		{
			if (!this.isEnabled() && !me.isConsumed())
			{
				var cell = me.getCell();
				
				if (cell != null)
				{
					var link = this.getLinkForCell(cell);
					
					if (link != null)
					{
						window.open(link);
					}
				}
			}
			else
			{
				return click.apply(this, arguments);
			}
		};
		
		// Shows pointer cursor for clickable cells with links
		// ie. if the graph is disabled and cells cannot be selected
		var getCursorForCell = this.getCursorForCell;
		this.getCursorForCell = function(cell)
		{
			if (!this.isEnabled())
			{
				var link = this.getLinkForCell(cell);
				
				if (link != null)
				{
					return 'pointer';
				}
			}
			else
			{
				return getCursorForCell.apply(this, arguments);
			}
		};
		
		// Changes rubberband selection to be recursive
		this.selectRegion = function(rect, evt)
		{
			var cells = this.getAllCells(rect.x, rect.y, rect.width, rect.height);
			this.selectCellsForEvent(cells, evt);
			
			return cells;
		};
		
		// Recursive implementation for rubberband selection
		this.getAllCells = function(x, y, width, height, parent, result)
		{
			result = (result != null) ? result : [];
			
			if (width > 0 || height > 0)
			{
				var model = this.getModel();
				var right = x + width;
				var bottom = y + height;
	
				if (parent == null)
				{
					parent = this.getCurrentRoot();
					
					if (parent == null)
					{
						parent = model.getRoot();
					}
				}
				
				if (parent != null)
				{
					var childCount = model.getChildCount(parent);
					
					for (var i = 0; i < childCount; i++)
					{
						var cell = model.getChildAt(parent, i);
						var state = this.view.getState(cell);
						
						if (state != null && this.isCellVisible(cell) && mxUtils.getValue(state.style, 'locked', '0') != '1')
						{
							var deg = mxUtils.getValue(state.style, mxConstants.STYLE_ROTATION) || 0;
							var box = state;
							
							if (deg != 0)
							{
								box = mxUtils.getBoundingBox(box, deg);
							}
							
							if ((model.isEdge(cell) || model.isVertex(cell)) &&
								box.x >= x && box.y + box.height <= bottom &&
								box.y >= y && box.x + box.width <= right)
							{
								result.push(cell);
							}
	
							this.getAllCells(x, y, width, height, cell, result);
						}
					}
				}
			}
			
			return result;
		};

		// Never removes cells from parents that are being moved
		var graphHandlerShouldRemoveCellsFromParent = this.graphHandler.shouldRemoveCellsFromParent;
		this.graphHandler.shouldRemoveCellsFromParent = function(parent, cells, evt)
		{
			if (this.graph.isCellSelected(parent))
			{
				return false;
			}
			
			return graphHandlerShouldRemoveCellsFromParent.apply(this, arguments);
		};

		// Unlocks all cells
		this.isCellLocked = function(cell)
		{
			var pState = this.view.getState(cell);
			
			while (pState != null)
			{
				if (mxUtils.getValue(pState.style, 'locked', '0') == '1')
				{
					return true;
				}
				
				pState = this.view.getState(this.model.getParent(pState.cell));
			}
			
			return false;
		};
		
		var tapAndHoldSelection = null;
		
		// Uses this event to process mouseDown to check the selection state before it is changed
		this.addListener(mxEvent.FIRE_MOUSE_EVENT, mxUtils.bind(this, function(sender, evt)
		{
			if (evt.getProperty('eventName') == 'mouseDown')
			{
				var me = evt.getProperty('event');
				var state = me.getState();
				
				if (state != null && !this.isSelectionEmpty() && !this.isCellSelected(state.cell))
				{
					tapAndHoldSelection = this.getSelectionCells();
				}
				else
				{
					tapAndHoldSelection = null;
				}
			}
		}));
		
		// Tap and hold on background starts rubberband for multiple selected
		// cells the cell associated with the event is deselected
		this.addListener(mxEvent.TAP_AND_HOLD, mxUtils.bind(this, function(sender, evt)
		{
			if (!mxEvent.isMultiTouchEvent(evt))
			{
				var me = evt.getProperty('event');
				var cell = evt.getProperty('cell');
				
				if (cell == null)
				{
					var pt = mxUtils.convertPoint(this.container,
							mxEvent.getClientX(me), mxEvent.getClientY(me));
					rubberband.start(pt.x, pt.y);
				}
				else if (tapAndHoldSelection != null)
				{
					this.addSelectionCells(tapAndHoldSelection);
				}
				else if (this.getSelectionCount() > 1 && this.isCellSelected(cell))
				{
					this.removeSelectionCell(cell);
				}
				
				// Blocks further processing of the event
				tapAndHoldSelection = null;
				evt.consume();
			}
		}));
	
		// On connect the target is selected and we clone the cell of the preview edge for insert
		this.connectionHandler.selectCells = function(edge, target)
		{
			this.graph.setSelectionCell(target || edge);
		};
		
		// Shows connection points only if cell not selected
		this.connectionHandler.constraintHandler.isStateIgnored = function(state, source)
		{
			return source && state.view.graph.isCellSelected(state.cell);
		};
		
		// Updates constraint handler if the selection changes
		this.selectionModel.addListener(mxEvent.CHANGE, mxUtils.bind(this, function()
		{
			var ch = this.connectionHandler.constraintHandler;
			
			if (ch.currentFocus != null && ch.isStateIgnored(ch.currentFocus, true))
			{
				ch.currentFocus = null;
				ch.constraints = null;
				ch.destroyIcons();
			}
			
			ch.destroyFocusHighlight();
		}));
		
		// Initializes touch interface
		if (Graph.touchStyle)
		{
			this.initTouch();
		}
		
		/**
		 * Adds locking
		 */
		var graphUpdateMouseEvent = this.updateMouseEvent;
		this.updateMouseEvent = function(me)
		{
			me = graphUpdateMouseEvent.apply(this, arguments);
			
			if (this.isCellLocked(me.getCell()))
			{
				me.state = null;
			}
			
			return me;
		};
	}
};

/**
 * Specifies if the touch UI should be used (cannot detect touch in FF so always on for Windows/Linux)
 */
Graph.touchStyle = mxClient.IS_TOUCH || (mxClient.IS_FF && mxClient.IS_WIN) || navigator.maxTouchPoints > 0 ||
	navigator.msMaxTouchPoints > 0 || window.urlParams == null || urlParams['touch'] == '1';

/**
 * Shortcut for capability check.
 */
Graph.fileSupport = window.File != null && window.FileReader != null && window.FileList != null &&
	(window.urlParams == null || urlParams['filesupport'] != '0');

/**
 * Default size for line jumps.
 */
Graph.lineJumpsEnabled = true;

/**
 * Default size for line jumps.
 */
Graph.defaultJumpSize = 6;

/**
 * Helper function (requires atob).
 */
Graph.createSvgImage = function(w, h, data)
{
	var tmp = unescape(encodeURIComponent(
        '<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">' +
        '<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="' + w + 'px" height="' + h + 'px" ' +
        'version="1.1">' + data + '</svg>'));

    return new mxImage('data:image/svg+xml;base64,' + ((window.btoa) ? btoa(tmp) : Base64.encode(tmp, true)), w, h)
};

/**
 * Graph inherits from mxGraph.
 */
mxUtils.extend(Graph, mxGraph);

/**
 * Allows all values in fit.
 */
Graph.prototype.minFitScale = null;

/**
 * Allows all values in fit.
 */
Graph.prototype.maxFitScale = null;

/**
 * Sets the policy for links. Possible values are "self" to replace any framesets,
 * "blank" to load the URL in <linkTarget> and "auto" (default).
 */
Graph.prototype.linkPolicy = (urlParams['target'] == 'frame') ? 'blank' : (urlParams['target'] || 'auto');

/**
 * Target for links that open in a new window. Default is _blank.
 */
Graph.prototype.linkTarget = (urlParams['target'] == 'frame') ? '_self' : '_blank';

/**
 * Scrollbars are enabled on non-touch devices (not including Firefox because touch events
 * cannot be detected in Firefox, see above).
 */
Graph.prototype.defaultScrollbars = !mxClient.IS_IOS;

/**
 * Specifies if the page should be visible for new files. Default is true.
 */
Graph.prototype.defaultPageVisible = true;

/**
 * Specifies if the app should run in chromeless mode. Default is false.
 * This default is only used if the contructor argument is null.
 */
Graph.prototype.lightbox = false;

/**
 * 
 */
Graph.prototype.defaultPageBackgroundColor = '#ffffff';

/**
 * 
 */
Graph.prototype.defaultPageBorderColor = '#ffffff';

/**
 * 
 */
Graph.prototype.defaultGraphBackground = '#ffffff';

/**
 * Specifies the size of the size for "tiles" to be used for a graph with
 * scrollbars but no visible background page. A good value is large
 * enough to reduce the number of repaints that is caused for auto-
 * translation, which depends on this value, and small enough to give
 * a small empty buffer around the graph. Default is 400x400.
 */
Graph.prototype.scrollTileSize = new mxRectangle(0, 0, 400, 400);

/**
 * Overrides the background color and paints a transparent background.
 */
Graph.prototype.transparentBackground = true;

/**
 * Sets the default target for all links in cells.
 */
Graph.prototype.defaultEdgeLength = 80;

/**
 * Disables move of bends/segments without selecting.
 */
Graph.prototype.edgeMode = false;

/**
 * Allows all values in fit.
 */
Graph.prototype.connectionArrowsEnabled = true;

/**
 * Specifies the regular expression for matching placeholders.
 */
Graph.prototype.placeholderPattern = new RegExp('%(date\{.*\}|[^%^\{^\}]+)%', 'g');

/**
 * Specifies the regular expression for matching placeholders.
 */
Graph.prototype.absoluteUrlPattern = new RegExp('^(?:[a-z]+:)?//', 'i');

/**
 * Specifies the default name for the theme. Default is 'default'.
 */
Graph.prototype.defaultThemeName = 'default';

/**
 * Specifies the default name for the theme. Default is 'default'.
 */
Graph.prototype.defaultThemes = {};

/**
 * Base URL for relative links.
 */
Graph.prototype.baseUrl = ((window != window.top) ? document.referrer : document.location.toString()).split('#')[0];

/**
 * Installs child layout styles.
 */
Graph.prototype.init = function(container)
{
	mxGraph.prototype.init.apply(this, arguments);

	// Intercepts links with no target attribute and opens in new window
	this.cellRenderer.initializeLabel = function(state, shape)
	{
		mxCellRenderer.prototype.initializeLabel.apply(this, arguments);
		
		// Checks tolerance for clicks on links
		var tol = state.view.graph.tolerance;
		var handleClick = true;
		var first = null;
		
		var down = mxUtils.bind(this, function(evt)
		{
			handleClick = true;
			first = new mxPoint(mxEvent.getClientX(evt), mxEvent.getClientY(evt));
		});
		
		var move = mxUtils.bind(this, function(evt)
		{
			handleClick = handleClick && first != null &&
				Math.abs(first.x - mxEvent.getClientX(evt)) < tol &&
				Math.abs(first.y - mxEvent.getClientY(evt)) < tol;
		});
		
		var up = mxUtils.bind(this, function(evt)
		{
			if (handleClick)
			{
				var elt = mxEvent.getSource(evt)
				
				while (elt != null && elt != shape.node)
				{
					if (elt.nodeName.toLowerCase() == 'a')
					{
						state.view.graph.labelLinkClicked(state, elt, evt);
						break;
					}
					
					elt = elt.parentNode;
				}
			}
		});
		
		mxEvent.addGestureListeners(shape.node, down, move, up);
		mxEvent.addListener(shape.node, 'click', function(evt)
		{
			mxEvent.consume(evt);
		});
	};
	
	this.initLayoutManager();
};

/**
 * Adds support for page links.
 */
Graph.prototype.isPageLink = function(href)
{
	return false;
};

/**
 * Installs automatic layout via styles
 */
Graph.prototype.labelLinkClicked = function(state, elt, evt)
{
	var href = elt.getAttribute('href');
	
	if (href != null && !this.isPageLink(href))
	{
		if (!this.isEnabled())
		{
			var target = state.view.graph.isBlankLink(href) ?
				state.view.graph.linkTarget : '_top';
			href = state.view.graph.getAbsoluteUrl(href);
	
			// Workaround for blocking in same iframe
			if (target == '_self' && window != window.top)
			{
				window.location.href = href;
			}
			else
			{
				// Avoids page reload for anchors (workaround for IE but used everywhere)
				if (href.substring(0, this.baseUrl.length) == this.baseUrl &&
					href.charAt(this.baseUrl.length) == '#' &&
					target == '_top' && window == window.top)
				{
					window.location.hash = href.split('#')[1];
				}
				else if ((mxEvent.isLeftMouseButton(evt) &&
					!mxEvent.isPopupTrigger(evt)) ||
			    		mxEvent.isTouchEvent(evt))
				{
					window.open(href, target);
				}
			}
		}
		
		mxEvent.consume(evt);
	}
};

/**
 * Returns true if the fiven href references an external protocol that
 * should never open in a new window. Default returns true for mailto.
 */
Graph.prototype.isExternalProtocol = function(href)
{
	return href.substring(0, 7) === 'mailto:';
};

/**
 * Hook for links to open in same window. Default returns true for anchors,
 * links to same domain or if target == 'self' in the config.
 */
Graph.prototype.isBlankLink = function(href)
{
	return !this.isExternalProtocol(href) &&
		(this.linkPolicy === 'blank' ||
		(this.linkPolicy !== 'self' &&
		!this.isRelativeUrl(href) &&
		href.substring(0, this.domainUrl.length) !== this.domainUrl));
};

/**
 * 
 */
Graph.prototype.isRelativeUrl = function(url)
{
	return url != null && !this.absoluteUrlPattern.test(url) &&
		url.substring(0, 5) !== 'data:' &&
		!this.isExternalProtocol(url);
};

/**
 * Installs automatic layout via styles
 */
Graph.prototype.initLayoutManager = function()
{
	this.layoutManager = new mxLayoutManager(this);

	this.layoutManager.getLayout = function(cell)
	{
		var state = this.graph.view.getState(cell);
		var style = (state != null) ? state.style : this.graph.getCellStyle(cell);
		
		if (style['childLayout'] == 'stackLayout')
		{
			var stackLayout = new mxStackLayout(this.graph, true);
			stackLayout.resizeParentMax = mxUtils.getValue(style, 'resizeParentMax', '1') == '1';
			stackLayout.horizontal = mxUtils.getValue(style, 'horizontalStack', '1') == '1';
			stackLayout.resizeParent = mxUtils.getValue(style, 'resizeParent', '1') == '1';
			stackLayout.resizeLast = mxUtils.getValue(style, 'resizeLast', '0') == '1';
			stackLayout.spacing = style['stackSpacing'] || stackLayout.spacing;
			stackLayout.border = style['stackBorder'] || stackLayout.border;
			stackLayout.marginLeft = style['marginLeft'] || 0;
			stackLayout.marginRight = style['marginRight'] || 0;
			stackLayout.marginTop = style['marginTop'] || 0;
			stackLayout.marginBottom = style['marginBottom'] || 0;
			stackLayout.fill = true;
			
			return stackLayout;
		}
		else if (style['childLayout'] == 'treeLayout')
		{
			var treeLayout = new mxCompactTreeLayout(this.graph);
			treeLayout.horizontal = mxUtils.getValue(style, 'horizontalTree', '1') == '1';
			treeLayout.resizeParent = mxUtils.getValue(style, 'resizeParent', '1') == '1';
			treeLayout.groupPadding = mxUtils.getValue(style, 'parentPadding', 20);
			treeLayout.levelDistance = mxUtils.getValue(style, 'treeLevelDistance', 30);
			treeLayout.maintainParentLocation = true;
			treeLayout.edgeRouting = false;
			treeLayout.resetEdges = false;
			
			return treeLayout;
		}
		else if (style['childLayout'] == 'flowLayout')
		{
			var flowLayout = new mxHierarchicalLayout(this.graph, mxUtils.getValue(style,
					'flowOrientation', mxConstants.DIRECTION_EAST));
			flowLayout.resizeParent = mxUtils.getValue(style, 'resizeParent', '1') == '1';
			flowLayout.parentBorder = mxUtils.getValue(style, 'parentPadding', 20);
			flowLayout.maintainParentLocation = true;
			
			// Special undocumented styles for changing the hierarchical
			flowLayout.intraCellSpacing = mxUtils.getValue(style, 'intraCellSpacing', mxHierarchicalLayout.prototype.intraCellSpacing);
			flowLayout.interRankCellSpacing = mxUtils.getValue(style, 'interRankCellSpacing', mxHierarchicalLayout.prototype.interRankCellSpacing);
			flowLayout.interHierarchySpacing = mxUtils.getValue(style, 'interHierarchySpacing', mxHierarchicalLayout.prototype.interHierarchySpacing);
			flowLayout.parallelEdgeSpacing = mxUtils.getValue(style, 'parallelEdgeSpacing', mxHierarchicalLayout.prototype.parallelEdgeSpacing);
			
			return flowLayout;
		}
		
		return null;
	};
};
	
	/**
	 * Returns the size of the page format scaled with the page size.
	 */
Graph.prototype.getPageSize = function()
{
	return (this.pageVisible) ? new mxRectangle(0, 0, this.pageFormat.width * this.pageScale,
			this.pageFormat.height * this.pageScale) : this.scrollTileSize;
};

/**
 * Returns a rectangle describing the position and count of the
 * background pages, where x and y are the position of the top,
 * left page and width and height are the vertical and horizontal
 * page count.
 */
Graph.prototype.getPageLayout = function()
{
	var size = this.getPageSize();
	var bounds = this.getGraphBounds();

	if (bounds.width == 0 || bounds.height == 0)
	{
		return new mxRectangle(0, 0, 1, 1);
	}
	else
	{
		// Computes untransformed graph bounds
		var x = Math.ceil(bounds.x / this.view.scale - this.view.translate.x);
		var y = Math.ceil(bounds.y / this.view.scale - this.view.translate.y);
		var w = Math.floor(bounds.width / this.view.scale);
		var h = Math.floor(bounds.height / this.view.scale);
		
		var x0 = Math.floor(x / size.width);
		var y0 = Math.floor(y / size.height);
		var w0 = Math.ceil((x + w) / size.width) - x0;
		var h0 = Math.ceil((y + h) / size.height) - y0;
		
		return new mxRectangle(x0, y0, w0, h0);
	}
};

/**
 * Sanitizes the given HTML markup.
 */
Graph.prototype.sanitizeHtml = function(value, editing)
{
	// Uses https://code.google.com/p/google-caja/wiki/JsHtmlSanitizer
	// NOTE: Original minimized sanitizer was modified to support
	// data URIs for images, mailto and special data:-links.
	// LATER: Add MathML to whitelisted tags
	function urlX(link)
	{
		if (link != null && link.toString().toLowerCase().substring(0, 11) !== 'javascript:')
		{
			return link;
		}
		
		return null;
	};
    function idX(id) { return id };
	
	return html_sanitize(value, urlX, idX);
};

/**
 * Revalidates all cells with placeholders in the current graph model.
 */
Graph.prototype.updatePlaceholders = function()
{
	var model = this.model;
	var validate = false;
	
	for (var key in this.model.cells)
	{
		var cell = this.model.cells[key];
		
		if (this.isReplacePlaceholders(cell))
		{
			this.view.invalidate(cell, false, false);
			validate = true;
		}
	}
	
	if (validate)
	{
		this.view.validate();
	}
};

/**
 * Adds support for placeholders in labels.
 */
Graph.prototype.isReplacePlaceholders = function(cell)
{
	return cell.value != null && typeof(cell.value) == 'object' &&
		cell.value.getAttribute('placeholders') == '1';
};

/**
 * Adds Alt+click to select cells behind cells.
 */
Graph.prototype.isTransparentClickEvent = function(evt)
{
	return mxEvent.isAltDown(evt);
};

/**
 * Adds ctrl+shift+connect to disable connections.
 */
Graph.prototype.isIgnoreTerminalEvent = function(evt)
{
	return mxEvent.isShiftDown(evt) && mxEvent.isControlDown(evt);
};

/**
 * Adds support for placeholders in labels.
 */
Graph.prototype.isSplitTarget = function(target, cells, evt)
{
	return !this.model.isEdge(cells[0]) &&
		!mxEvent.isAltDown(evt) && !mxEvent.isShiftDown(evt) &&
		mxGraph.prototype.isSplitTarget.apply(this, arguments);
};

/**
 * Adds support for placeholders in labels.
 */
Graph.prototype.getLabel = function(cell)
{
	var result = mxGraph.prototype.getLabel.apply(this, arguments);
	
	if (result != null && this.isReplacePlaceholders(cell) && cell.getAttribute('placeholder') == null)
	{
		result = this.replacePlaceholders(cell, result);
	}
	
	return result;
};

/**
 * Adds labelMovable style.
 */
Graph.prototype.isLabelMovable = function(cell)
{
	var state = this.view.getState(cell);
	var style = (state != null) ? state.style : this.getCellStyle(cell);
	
	return !this.isCellLocked(cell) &&
		((this.model.isEdge(cell) && this.edgeLabelsMovable) ||
		(this.model.isVertex(cell) && (this.vertexLabelsMovable ||
		mxUtils.getValue(style, 'labelMovable', '0') == '1')));
};

/**
 * Adds event if grid size is changed.
 */
Graph.prototype.setGridSize = function(value)
{
	this.gridSize = value;
	this.fireEvent(new mxEventObject('gridSizeChanged'));
};

/**
 * Private helper method.
 */
Graph.prototype.getGlobalVariable = function(name)
{
	var val = null;
	
	if (name == 'date')
	{
		val = new Date().toLocaleDateString();
	}
	else if (name == 'time')
	{
		val = new Date().toLocaleTimeString();
	}
	else if (name == 'timestamp')
	{
		val = new Date().toLocaleString();
	}
	else if (name.substring(0, 5) == 'date{')
	{
		var fmt = name.substring(5, name.length - 1);
		val = this.formatDate(new Date(), fmt);
	}

	return val;
};

/**
 * Formats a date, see http://blog.stevenlevithan.com/archives/date-time-format
 */
Graph.prototype.formatDate = function(date, mask, utc)
{
	// LATER: Cache regexs
	if (this.dateFormatCache == null)
	{
		this.dateFormatCache = {
			i18n: {
			    dayNames: [
			        "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat",
			        "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
			    ],
			    monthNames: [
			        "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
			        "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"
			    ]
			},
			
			masks: {
			    "default":      "ddd mmm dd yyyy HH:MM:ss",
			    shortDate:      "m/d/yy",
			    mediumDate:     "mmm d, yyyy",
			    longDate:       "mmmm d, yyyy",
			    fullDate:       "dddd, mmmm d, yyyy",
			    shortTime:      "h:MM TT",
			    mediumTime:     "h:MM:ss TT",
			    longTime:       "h:MM:ss TT Z",
			    isoDate:        "yyyy-mm-dd",
			    isoTime:        "HH:MM:ss",
			    isoDateTime:    "yyyy-mm-dd'T'HH:MM:ss",
			    isoUtcDateTime: "UTC:yyyy-mm-dd'T'HH:MM:ss'Z'"
			}
		};
	}
    
    var dF = this.dateFormatCache;
	var token = /d{1,4}|m{1,4}|yy(?:yy)?|([HhMsTt])\1?|[LloSZ]|"[^"]*"|'[^']*'/g,
    	timezone = /\b(?:[PMCEA][SDP]T|(?:Pacific|Mountain|Central|Eastern|Atlantic) (?:Standard|Daylight|Prevailing) Time|(?:GMT|UTC)(?:[-+]\d{4})?)\b/g,
    	timezoneClip = /[^-+\dA-Z]/g,
    	pad = function (val, len) {
			val = String(val);
			len = len || 2;
			while (val.length < len) val = "0" + val;
			return val;
		};

    // You can't provide utc if you skip other args (use the "UTC:" mask prefix)
    if (arguments.length == 1 && Object.prototype.toString.call(date) == "[object String]" && !/\d/.test(date)) {
        mask = date;
        date = undefined;
    }

    // Passing date through Date applies Date.parse, if necessary
    date = date ? new Date(date) : new Date;
    if (isNaN(date)) throw SyntaxError("invalid date");

    mask = String(dF.masks[mask] || mask || dF.masks["default"]);

    // Allow setting the utc argument via the mask
    if (mask.slice(0, 4) == "UTC:") {
        mask = mask.slice(4);
        utc = true;
    }

    var _ = utc ? "getUTC" : "get",
        d = date[_ + "Date"](),
        D = date[_ + "Day"](),
        m = date[_ + "Month"](),
        y = date[_ + "FullYear"](),
        H = date[_ + "Hours"](),
        M = date[_ + "Minutes"](),
        s = date[_ + "Seconds"](),
        L = date[_ + "Milliseconds"](),
        o = utc ? 0 : date.getTimezoneOffset(),
        flags = {
            d:    d,
            dd:   pad(d),
            ddd:  dF.i18n.dayNames[D],
            dddd: dF.i18n.dayNames[D + 7],
            m:    m + 1,
            mm:   pad(m + 1),
            mmm:  dF.i18n.monthNames[m],
            mmmm: dF.i18n.monthNames[m + 12],
            yy:   String(y).slice(2),
            yyyy: y,
            h:    H % 12 || 12,
            hh:   pad(H % 12 || 12),
            H:    H,
            HH:   pad(H),
            M:    M,
            MM:   pad(M),
            s:    s,
            ss:   pad(s),
            l:    pad(L, 3),
            L:    pad(L > 99 ? Math.round(L / 10) : L),
            t:    H < 12 ? "a"  : "p",
            tt:   H < 12 ? "am" : "pm",
            T:    H < 12 ? "A"  : "P",
            TT:   H < 12 ? "AM" : "PM",
            Z:    utc ? "UTC" : (String(date).match(timezone) || [""]).pop().replace(timezoneClip, ""),
            o:    (o > 0 ? "-" : "+") + pad(Math.floor(Math.abs(o) / 60) * 100 + Math.abs(o) % 60, 4),
            S:    ["th", "st", "nd", "rd"][d % 10 > 3 ? 0 : (d % 100 - d % 10 != 10) * d % 10]
        };

    return mask.replace(token, function ($0)
    {
        return $0 in flags ? flags[$0] : $0.slice(1, $0.length - 1);
    });
};

/**
 * 
 */
Graph.prototype.createLayersDialog = function()
{
	var div = document.createElement('div');
	div.style.position = 'absolute';
	
	var model = this.getModel();
	var childCount = model.getChildCount(model.root);
	
	for (var i = 0; i < childCount; i++)
	{
		(function(layer)
		{
			var span = document.createElement('div');
			span.style.overflow = 'hidden';
			span.style.textOverflow = 'ellipsis';
			span.style.padding = '2px';
			span.style.whiteSpace = 'nowrap';

			var cb = document.createElement('input');
			cb.style.display = 'inline-block';
			cb.setAttribute('type', 'checkbox');
			
			if (model.isVisible(layer))
			{
				cb.setAttribute('checked', 'checked');
				cb.defaultChecked = true;
			}
			
			span.appendChild(cb);
			var title = layer.value || (mxResources.get('background') || 'Background');
			span.setAttribute('title', title);
			mxUtils.write(span, title);
			div.appendChild(span);
			
			mxEvent.addListener(cb, 'click', function()
			{
				if (cb.getAttribute('checked') != null)
				{
					cb.removeAttribute('checked');
				}
				else
				{
					cb.setAttribute('checked', 'checked');
				}
				
				model.setVisible(layer, cb.checked);
			});
		}(model.getChildAt(model.root, i)));
	}
	
	return div;
};

/**
 * Private helper method.
 */
Graph.prototype.replacePlaceholders = function(cell, str)
{
	var result = [];
	var last = 0;
	var math = [];
	
	while (match = this.placeholderPattern.exec(str))
	{
		var val = match[0];
		
		if (val.length > 2 && val != '%label%' && val != '%tooltip%')
		{
			var tmp = null;

			if (match.index > last && str.charAt(match.index - 1) == '%')
			{
				tmp = val.substring(1);
			}
			else
			{
				var name = val.substring(1, val.length - 1);
				
				// Workaround for invalid char for getting attribute in older versions of IE
				if (name.indexOf('{') < 0)
				{
					var current = cell;
					
					while (tmp == null && current != null)
					{
						if (current.value != null && typeof(current.value) == 'object')
						{
							tmp = (current.hasAttribute(name)) ? ((current.getAttribute(name) != null) ?
									current.getAttribute(name) : '') : null;
						}
						
						current = this.model.getParent(current);
					}
				}
				
				if (tmp == null)
				{
					tmp = this.getGlobalVariable(name);
				}
			}

			result.push(str.substring(last, match.index) + ((tmp != null) ? tmp : val));
			last = match.index + val.length;
		}
	}
	
	result.push(str.substring(last));

	return result.join('');
};

/**
 * Selects cells for connect vertex return value.
 */
Graph.prototype.selectCellsForConnectVertex = function(cells, evt, hoverIcons)
{
	// Selects only target vertex if one exists
	if (cells.length == 2 && this.model.isVertex(cells[1]))
	{
		this.setSelectionCell(cells[1]);
		
		if (hoverIcons != null)
		{
			// Adds hover icons to new target vertex for touch devices
			if (mxEvent.isTouchEvent(evt))
			{
				hoverIcons.update(hoverIcons.getState(this.view.getState(cells[1])));
			}
			else
			{
				// Hides hover icons after click with mouse
				hoverIcons.reset();
			}
		}
		
		this.scrollCellToVisible(cells[1]);
	}
	else
	{
		this.setSelectionCells(cells);
	}
};

/**
 * Adds a connection to the given vertex.
 */
Graph.prototype.connectVertex = function(source, direction, length, evt, forceClone, ignoreCellAt)
{
	ignoreCellAt = (ignoreCellAt) ? ignoreCellAt : false;
	
	var pt = (source.geometry.relative && source.parent.geometry != null) ?
			new mxPoint(source.parent.geometry.width * source.geometry.x, source.parent.geometry.height * source.geometry.y) :
			new mxPoint(source.geometry.x, source.geometry.y);
		
	if (direction == mxConstants.DIRECTION_NORTH)
	{
		pt.x += source.geometry.width / 2;
		pt.y -= length ;
	}
	else if (direction == mxConstants.DIRECTION_SOUTH)
	{
		pt.x += source.geometry.width / 2;
		pt.y += source.geometry.height + length;
	}
	else if (direction == mxConstants.DIRECTION_WEST)
	{
		pt.x -= length;
		pt.y += source.geometry.height / 2;
	}
	else
	{
		pt.x += source.geometry.width + length;
		pt.y += source.geometry.height / 2;
	}

	var parentState = this.view.getState(this.model.getParent(source));
	var s = this.view.scale;
	var t = this.view.translate;
	var dx = t.x * s;
	var dy = t.y * s;
	
	if (this.model.isVertex(parentState.cell))
	{
		dx = parentState.x;
		dy = parentState.y;
	}

	// Workaround for relative child cells
	if (this.model.isVertex(source.parent) && source.geometry.relative)
	{
		pt.x += source.parent.geometry.x;
		pt.y += source.parent.geometry.y;
	}
	
	// Checks actual end point of edge for target cell
	var target = (ignoreCellAt || (mxEvent.isControlDown(evt) && !forceClone)) ?
		null : this.getCellAt(dx + pt.x * s, dy + pt.y * s);
	
	if (this.model.isAncestor(target, source))
	{
		target = null;
	}
	
	// Checks if target or ancestor is locked
	var temp = target;
	
	while (temp != null)
	{
		if (this.isCellLocked(temp))
		{
			target = null;
			break;
		}
		
		temp = this.model.getParent(temp);
	}
	
	// Checks if source and target intersect
	if (target != null)
	{
		var sourceState = this.view.getState(source);
		var targetState = this.view.getState(target);
		
		if (sourceState != null && targetState != null && mxUtils.intersects(sourceState, targetState))
		{
			target = null;
		}
	}
	
	var duplicate = !mxEvent.isShiftDown(evt) || forceClone;
	
	if (duplicate)
	{
		if (direction == mxConstants.DIRECTION_NORTH)
		{
			pt.y -= source.geometry.height / 2;
		}
		else if (direction == mxConstants.DIRECTION_SOUTH)
		{
			pt.y += source.geometry.height / 2;
		}
		else if (direction == mxConstants.DIRECTION_WEST)
		{
			pt.x -= source.geometry.width / 2;
		}
		else
		{
			pt.x += source.geometry.width / 2;
		}
	}

	// Uses connectable parent vertex if one exists
	if (target != null && !this.isCellConnectable(target))
	{
		var parent = this.getModel().getParent(target);
		
		if (this.getModel().isVertex(parent) && this.isCellConnectable(parent))
		{
			target = parent;
		}
	}
	
	if (target == source || this.model.isEdge(target) || !this.isCellConnectable(target))
	{
		target = null;
	}
	
	var result = [];
	
	this.model.beginUpdate();
	try
	{
		var realTarget = target;
		
		if (realTarget == null && duplicate)
		{
			// Handles relative children
			var cellToClone = source;
			var geo = this.getCellGeometry(source);
			
			while (geo != null && geo.relative)
			{
				cellToClone = this.getModel().getParent(cellToClone);
				geo = this.getCellGeometry(cellToClone);
			}
			
			// Handle consistuents for cloning
			var state = this.view.getState(cellToClone);
			var style = (state != null) ? state.style : this.getCellStyle(cellToClone);
	    	
			if (mxUtils.getValue(style, 'part', false))
			{
		        var tmpParent = this.model.getParent(cellToClone);

		        if (this.model.isVertex(tmpParent))
		        {
		        	cellToClone = tmpParent;
		        }
			}
			
			realTarget = this.duplicateCells([cellToClone], false)[0];
			
			var geo = this.getCellGeometry(realTarget);
			
			if (geo != null)
			{
				geo.x = pt.x - geo.width / 2;
				geo.y = pt.y - geo.height / 2;
			}
		}
		
		// Never connects children in stack layouts
		var layout = null;

		if (this.layoutManager != null)
		{
			layout = this.layoutManager.getLayout(this.model.getParent(source));
		}
		
		var edge = ((mxEvent.isControlDown(evt) && duplicate) || (target == null && layout != null && layout.constructor == mxStackLayout)) ? null :
			this.insertEdge(this.model.getParent(source), null, '', source, realTarget, this.createCurrentEdgeStyle());

		// Inserts edge before source
		if (edge != null && this.connectionHandler.insertBeforeSource)
		{
			var index = null;
			var tmp = source;
			
			while (tmp.parent != null && tmp.geometry != null &&
				tmp.geometry.relative && tmp.parent != edge.parent)
			{
				tmp = this.model.getParent(tmp);
			}
		
			if (tmp != null && tmp.parent != null && tmp.parent == edge.parent)
			{
				var index = tmp.parent.getIndex(tmp);
				this.model.add(tmp.parent, edge, index);
			}
		}
		
		// Special case: Click on west icon puts clone before cell
		if (target == null && realTarget != null && layout != null && source.parent != null &&
			layout.constructor == mxStackLayout && direction == mxConstants.DIRECTION_WEST)
		{
			var index = source.parent.getIndex(source);
			this.model.add(source.parent, realTarget, index);
		}
		
		if (edge != null)
		{
			// Uses elbow edges with vertical or horizontal direction
//			var elbowValue = (direction == mxConstants.DIRECTION_NORTH || direction == mxConstants.DIRECTION_SOUTH) ? 'vertical' : 'horizontal';
//			edge.style = mxUtils.setStyle(edge.style, 'edgeStyle', 'elbowEdgeStyle');
//			edge.style = mxUtils.setStyle(edge.style, 'elbow', elbowValue);
			result.push(edge);
		}
		
		if (target == null && realTarget != null)
		{
			result.push(realTarget);
		}
		
		if (realTarget == null && edge != null)
		{
			edge.geometry.setTerminalPoint(pt, false);
		}
		
		if (edge != null)
		{
			this.fireEvent(new mxEventObject('cellsInserted', 'cells', [edge]));
		}
	}
	finally
	{
		this.model.endUpdate();
	}
	
	return result;
};

/**
 * Returns all labels in the diagram as a string.
 */
Graph.prototype.getIndexableText = function()
{
	var tmp = document.createElement('div');
	var labels = [];
	var label = '';
	
	for (var key in this.model.cells)
	{
		var cell = this.model.cells[key];
		
		if (this.model.isVertex(cell) || this.model.isEdge(cell))
		{
			if (this.isHtmlLabel(cell))
			{
				tmp.innerHTML = this.getLabel(cell);
				label = mxUtils.extractTextWithWhitespace([tmp]);
			}
			else
			{					
				label = this.getLabel(cell);
			}

			label = mxUtils.trim(label.replace(/[\x00-\x1F\x7F-\x9F]|\s+/g, ' '));
			
			if (label.length > 0)
			{
				labels.push(label);
			}
		}
	}
	
	return labels.join(' ');
};

/**
 * Returns the label for the given cell.
 */
Graph.prototype.convertValueToString = function(cell)
{
	if (cell.value != null && typeof(cell.value) == 'object')
	{
		if (this.isReplacePlaceholders(cell) && cell.getAttribute('placeholder') != null)
		{
			var name = cell.getAttribute('placeholder');
			var current = cell;
			var result = null;
					
			while (result == null && current != null)
			{
				if (current.value != null && typeof(current.value) == 'object')
				{
					result = (current.hasAttribute(name)) ? ((current.getAttribute(name) != null) ?
							current.getAttribute(name) : '') : null;
				}
				
				current = this.model.getParent(current);
			}
			
			return result || '';
		}
		else
		{	
			return cell.value.getAttribute('label');
		}
	}
	
	return mxGraph.prototype.convertValueToString.apply(this, arguments);
};

/**
 * Returns the link for the given cell.
 */
Graph.prototype.getLinksForState = function(state)
{
	if (state != null && state.text != null && state.text.node != null)
	{
		return state.text.node.getElementsByTagName('a');
	}
	
	return null;
};

/**
 * Returns the link for the given cell.
 */
Graph.prototype.getLinkForCell = function(cell)
{
	if (cell.value != null && typeof(cell.value) == 'object')
	{
		var link = cell.value.getAttribute('link');
		
		// Removes links with leading javascript: protocol
		// TODO: Check more possible attack vectors
		if (link != null && link.toLowerCase().substring(0, 11) === 'javascript:')
		{
			link = link.substring(11);
		}
		
		return link;
	}
	
	return null;
};

/**
 * Overrides label orientation for collapsed swimlanes inside stack.
 */
Graph.prototype.getCellStyle = function(cell)
{
	var style = mxGraph.prototype.getCellStyle.apply(this, arguments);
	
	if (cell != null && this.layoutManager != null)
	{
		var parent = this.model.getParent(cell);
		
		if (this.model.isVertex(parent) && this.isCellCollapsed(cell))
		{
			var layout = this.layoutManager.getLayout(parent);
			
			if (layout != null && layout.constructor == mxStackLayout)
			{
				style[mxConstants.STYLE_HORIZONTAL] = !layout.horizontal;
			}
		}
	}
	
	return style;
};

/**
 * Disables alternate width persistence for stack layout parents
 */
Graph.prototype.updateAlternateBounds = function(cell, geo, willCollapse)
{
	if (cell != null && geo != null && this.layoutManager != null && geo.alternateBounds != null)
	{
		var layout = this.layoutManager.getLayout(this.model.getParent(cell));
		
		if (layout != null && layout.constructor == mxStackLayout)
		{
			if (layout.horizontal)
			{
				geo.alternateBounds.height = 0;
			}
			else
			{
				geo.alternateBounds.width = 0;
			}
		}
	}
	
	mxGraph.prototype.updateAlternateBounds.apply(this, arguments);
};

/**
 * Adds Shift+collapse/expand and size management for folding inside stack
 */
Graph.prototype.isMoveCellsEvent = function(evt)
{
	return mxEvent.isShiftDown(evt);
};

/**
 * Adds Shift+collapse/expand and size management for folding inside stack
 */
Graph.prototype.foldCells = function(collapse, recurse, cells, checkFoldable, evt)
{
	recurse = (recurse != null) ? recurse : false;
	
	if (cells == null)
	{
		cells = this.getFoldableCells(this.getSelectionCells(), collapse);
	}
	
	if (cells != null)
	{
		this.model.beginUpdate();
		
		try
		{
			mxGraph.prototype.foldCells.apply(this, arguments);
			
			// Resizes all parent stacks if alt is not pressed
			if (this.layoutManager != null)
			{
				for (var i = 0; i < cells.length; i++)
				{
					var state = this.view.getState(cells[i]);
					var geo = this.getCellGeometry(cells[i]);
					
					if (state != null && geo != null)
					{
						var dx = Math.round(geo.width - state.width / this.view.scale);
						var dy = Math.round(geo.height - state.height / this.view.scale);
						
						if (dy != 0 || dx != 0)
						{
							var parent = this.model.getParent(cells[i]);
							var layout = this.layoutManager.getLayout(parent);
							
							if (layout == null)
							{
								// Moves cells to the right and down after collapse/expand
								if (evt != null && this.isMoveCellsEvent(evt))
								{
									this.moveSiblings(state, parent, dx, dy);
								} 
							}
							else if ((evt == null || !mxEvent.isAltDown(evt)) && layout.constructor == mxStackLayout && !layout.resizeLast)
							{
								this.resizeParentStacks(parent, layout, dx, dy);
							}
						}
					}
				}
			}
		}
		finally
		{
			this.model.endUpdate();
		}
		
		// Selects cells after folding
		if (this.isEnabled())
		{
			this.setSelectionCells(cells);
		}
	}
};

/**
 * Overrides label orientation for collapsed swimlanes inside stack.
 */
Graph.prototype.moveSiblings = function(state, parent, dx, dy)
{
	this.model.beginUpdate();
	try
	{
		var cells = this.getCellsBeyond(state.x, state.y, parent, true, true);
		
		for (var i = 0; i < cells.length; i++)
		{
			if (cells[i] != state.cell)
			{
				var tmp = this.view.getState(cells[i]);
				var geo = this.getCellGeometry(cells[i]);
				
				if (tmp != null && geo != null)
				{
					geo = geo.clone();
					geo.translate(Math.round(dx * Math.max(0, Math.min(1, (tmp.x - state.x) / state.width))),
						Math.round(dy * Math.max(0, Math.min(1, (tmp.y - state.y) / state.height))));
					this.model.setGeometry(cells[i], geo);
				}
			}
		}
	}
	finally
	{
		this.model.endUpdate();
	}
};

/**
 * Overrides label orientation for collapsed swimlanes inside stack.
 */
Graph.prototype.resizeParentStacks = function(parent, layout, dx, dy)
{
	if (this.layoutManager != null && layout != null && layout.constructor == mxStackLayout && !layout.resizeLast)
	{
		this.model.beginUpdate();
		try
		{
			var dir = layout.horizontal;
			
			// Bubble resize up for all parent stack layouts with same orientation
			while (parent != null && layout != null && layout.constructor == mxStackLayout &&
				layout.horizontal == dir && !layout.resizeLast)
			{
				var pgeo = this.getCellGeometry(parent);
				var pstate = this.view.getState(parent);
				
				if (pstate != null && pgeo != null)
				{
					pgeo = pgeo.clone();
					
					if (layout.horizontal)
					{
						pgeo.width += dx + Math.min(0, pstate.width / this.view.scale - pgeo.width);									
					}
					else
					{
						pgeo.height += dy + Math.min(0, pstate.height / this.view.scale - pgeo.height);
					}
		
					this.model.setGeometry(parent, pgeo);
				}
				
				parent = this.model.getParent(parent);
				layout = this.layoutManager.getLayout(parent);
			}
		}
		finally
		{
			this.model.endUpdate();
		}
	}
};

/**
 * Disables drill-down for non-swimlanes.
 */
Graph.prototype.isContainer = function(cell)
{
	var state = this.view.getState(cell);
	var style = (state != null) ? state.style : this.getCellStyle(cell);
	
	if (this.isSwimlane(cell))
	{
		return style['container'] != '0';
	}
	else
	{
		return style['container'] == '1';
	}
};

/**
 * Adds a connectable style.
 */
Graph.prototype.isCellConnectable = function(cell)
{
	var state = this.view.getState(cell);
	var style = (state != null) ? state.style : this.getCellStyle(cell);
	
	return (style['connectable'] != null) ? style['connectable']  != '0' :
		mxGraph.prototype.isCellConnectable.apply(this, arguments);
};

/**
 * Function: selectAll
 * 
 * Selects all children of the given parent cell or the children of the
 * default parent if no parent is specified. To select leaf vertices and/or
 * edges use <selectCells>.
 * 
 * Parameters:
 * 
 * parent - Optional <mxCell> whose children should be selected.
 * Default is <defaultParent>.
 */
Graph.prototype.selectAll = function(parent)
{
	parent = parent || this.getDefaultParent();

	if (!this.isCellLocked(parent))
	{
		mxGraph.prototype.selectAll.apply(this, arguments);
	}
};

/**
 * Function: selectCells
 * 
 * Selects all vertices and/or edges depending on the given boolean
 * arguments recursively, starting at the given parent or the default
 * parent if no parent is specified. Use <selectAll> to select all cells.
 * For vertices, only cells with no children are selected.
 * 
 * Parameters:
 * 
 * vertices - Boolean indicating if vertices should be selected.
 * edges - Boolean indicating if edges should be selected.
 * parent - Optional <mxCell> that acts as the root of the recursion.
 * Default is <defaultParent>.
 */
Graph.prototype.selectCells = function(vertices, edges, parent)
{
	parent = parent || this.getDefaultParent();

	if (!this.isCellLocked(parent))
	{
		mxGraph.prototype.selectCells.apply(this, arguments);
	}
};

/**
 * Function: getSwimlaneAt
 * 
 * Returns the bottom-most swimlane that intersects the given point (x, y)
 * in the cell hierarchy that starts at the given parent.
 * 
 * Parameters:
 * 
 * x - X-coordinate of the location to be checked.
 * y - Y-coordinate of the location to be checked.
 * parent - <mxCell> that should be used as the root of the recursion.
 * Default is <defaultParent>.
 */
Graph.prototype.getSwimlaneAt = function (x, y, parent)
{
	parent = parent || this.getDefaultParent();

	if (!this.isCellLocked(parent))
	{
		return mxGraph.prototype.getSwimlaneAt.apply(this, arguments);
	}
	
	return null;
};

/**
 * Disables folding for non-swimlanes.
 */
Graph.prototype.isCellFoldable = function(cell)
{
	var state = this.view.getState(cell);
	var style = (state != null) ? state.style : this.getCellStyle(cell);
	
	return this.foldingEnabled && !this.isCellLocked(cell) &&
		((this.isContainer(cell) && style['collapsible'] != '0') ||
		(!this.isContainer(cell) && style['collapsible'] == '1'));
};

/**
 * Stops all interactions and clears the selection.
 */
Graph.prototype.reset = function()
{
	if (this.isEditing())
	{
		this.stopEditing(true);
	}
	
	this.escape();
					
	if (!this.isSelectionEmpty())
	{
		this.clearSelection();
	}
};

/**
 * Overridden to limit zoom to 1% - 16.000%.
 */
Graph.prototype.zoom = function(factor, center)
{
	factor = Math.max(0.01, Math.min(this.view.scale * factor, 160)) / this.view.scale;
	
	mxGraph.prototype.zoom.apply(this, arguments);
};

/**
 * Function: zoomIn
 * 
 * Zooms into the graph by <zoomFactor>.
 */
Graph.prototype.zoomIn = function()
{
	// Switches to 1% zoom steps below 15%
	if (this.view.scale < 0.15)
	{
		this.zoom((this.view.scale + 0.01) / this.view.scale);
	}
	else
	{
		// Uses to 5% zoom steps for better grid rendering in webkit
		// and to avoid rounding errors for zoom steps
		this.zoom((Math.round(this.view.scale * this.zoomFactor * 20) / 20) / this.view.scale);
	}
};

/**
 * Function: zoomOut
 * 
 * Zooms out of the graph by <zoomFactor>.
 */
Graph.prototype.zoomOut = function()
{
	// Switches to 1% zoom steps below 15%
	if (this.view.scale <= 0.15)
	{
		this.zoom((this.view.scale - 0.01) / this.view.scale);
	}
	else
	{
		// Uses to 5% zoom steps for better grid rendering in webkit
		// and to avoid rounding errors for zoom steps
		this.zoom((Math.round(this.view.scale * (1 / this.zoomFactor) * 20) / 20) / this.view.scale);
	}
};

/**
 * Overrides tooltips to show custom tooltip or metadata.
 */
Graph.prototype.getTooltipForCell = function(cell)
{
	var tip = '';
	
	if (mxUtils.isNode(cell.value))
	{
		var tmp = cell.value.getAttribute('tooltip');
		
		if (tmp != null)
		{
			if (tmp != null && this.isReplacePlaceholders(cell))
			{
				tmp = this.replacePlaceholders(cell, tmp);
			}
			
			tip = this.sanitizeHtml(tmp);
		}
		else
		{
			var ignored = ['label', 'tooltip', 'placeholders', 'placeholder'];
			var attrs = cell.value.attributes;
			var temp = [];

			// Hides links in edit mode
			if (this.isEnabled())
			{
				ignored.push('link');
			}
			
			for (var i = 0; i < attrs.length; i++)
			{
				if (mxUtils.indexOf(ignored, attrs[i].nodeName) < 0 && attrs[i].nodeValue.length > 0)
				{
					temp.push({name: attrs[i].nodeName, value: attrs[i].nodeValue});
				}
			}
			
			// Sorts by name
			temp.sort(function(a, b)
			{
				if (a.name < b.name)
				{
					return -1;
				}
				else if (a.name > b.name)
				{
					return 1;
				}
				else
				{
					return 0;
				}
			});

			for (var i = 0; i < temp.length; i++)
			{
				if (temp[i].name != 'link' || !this.isPageLink(temp[i].value))
				{
					tip += ((temp[i].name != 'link') ? temp[i].name + ':' : '') +
						mxUtils.htmlEntities(temp[i].value) + '\n';
				}
			}
			
			if (tip.length > 0)
			{
				tip = tip.substring(0, tip.length - 1);
			}
		}
	}
	
	return tip;
};

/**
 * Turns the given string into an array.
 */
Graph.prototype.stringToBytes = function(str)
{
	var arr = new Array(str.length);

    for (var i = 0; i < str.length; i++)
    {
        arr[i] = str.charCodeAt(i);
    }
    
    return arr;
};

/**
 * Turns the given array into a string.
 */
Graph.prototype.bytesToString = function(arr)
{
	var result = new Array(arr.length);

    for (var i = 0; i < arr.length; i++)
    {
    	result[i] = String.fromCharCode(arr[i]);
    }
    
    return result.join('');
};

/**
 * Returns a base64 encoded version of the compressed string.
 */
Graph.prototype.compress = function(data)
{
	if (data == null || data.length == 0 || typeof(pako) === 'undefined')
	{
		return data;
	}
	else
	{
   		var tmp = this.bytesToString(pako.deflateRaw(encodeURIComponent(data)));
   		
   		return (window.btoa) ? btoa(tmp) : Base64.encode(tmp, true);
	}
};

/**
 * Returns a decompressed version of the base64 encoded string.
 */
Graph.prototype.decompress = function(data)
{
   	if (data == null || data.length == 0 || typeof(pako) === 'undefined')
	{
		return data;
	}
	else
	{
		var tmp = (window.atob) ? atob(data) : Base64.decode(data, true);
		
		return this.zapGremlins(decodeURIComponent(
			this.bytesToString(pako.inflateRaw(tmp))));
	}
};

/**
 * Removes all illegal control characters with ASCII code <32 except TAB, LF
 * and CR.
 */
Graph.prototype.zapGremlins = function(text)
{
	var checked = [];
	
	for (var i = 0; i < text.length; i++)
	{
		var code = text.charCodeAt(i);
		
		// Removes all control chars except TAB, LF and CR
		if (code >= 32 || code == 9 || code == 10 || code == 13)
		{
			checked.push(text.charAt(i));
		}
	}
	
	return checked.join('');
};

/**
 * Hover icons are used for hover, vertex handler and drag from sidebar.
 */
HoverIcons = function(graph)
{
	this.graph = graph;
	this.init();
};

/**
 * Up arrow.
 */
HoverIcons.prototype.arrowSpacing = 6;

/**
 * Delay to switch to another state for overlapping bbox. Default is 500ms.
 */
HoverIcons.prototype.updateDelay = 500;

/**
 * Delay to switch between states. Default is 140ms.
 */
HoverIcons.prototype.activationDelay = 140;

/**
 * Up arrow.
 */
HoverIcons.prototype.currentState = null;

/**
 * Up arrow.
 */
HoverIcons.prototype.activeArrow = null;

/**
 * Up arrow.
 */
HoverIcons.prototype.inactiveOpacity = 15;

/**
 * Up arrow.
 */
HoverIcons.prototype.cssCursor = 'copy';

/**
 * Whether to hide arrows that collide with vertices.
 * LATER: Add keyboard override, touch support.
 */
HoverIcons.prototype.checkCollisions = true;

/**
 * Up arrow.
 */
HoverIcons.prototype.triangleUp = (!mxClient.IS_SVG) ? new mxImage(IMAGE_PATH + '/triangle-up.png', 26, 14) :
	Graph.createSvgImage(26, 14, '<path d="m 1 14 L 13 1 L 26 14 z" stroke="#fff" fill="#007dfc"/>');

/**
 * Right arrow.
 */
HoverIcons.prototype.triangleRight = (!mxClient.IS_SVG) ? new mxImage(IMAGE_PATH + '/triangle-right.png', 14, 26) :
	Graph.createSvgImage(14, 26, '<path d="m 1 1 L 14 13 L 1 26 z" stroke="#fff" fill="#007dfc"/>');

/**
 * Down arrow.
 */
HoverIcons.prototype.triangleDown = (!mxClient.IS_SVG) ? new mxImage(IMAGE_PATH + '/triangle-down.png', 26, 14) :
	Graph.createSvgImage(26, 14, '<path d="m 1 1 L 13 14 L 26 1 z" stroke="#fff" fill="#007dfc"/>');

/**
 * Left arrow.
 */
HoverIcons.prototype.triangleLeft = (!mxClient.IS_SVG) ? new mxImage(IMAGE_PATH + '/triangle-left.png', 14, 26) :
	Graph.createSvgImage(14, 26, '<path d="m 14 1 L 1 13 L 14 26 z" stroke="#fff" fill="#007dfc"/>');

/**
 * Round target.
 */
HoverIcons.prototype.roundDrop = (!mxClient.IS_SVG) ? new mxImage(IMAGE_PATH + '/round-drop.png', 26, 26) :
	Graph.createSvgImage(26, 26, '<circle cx="13" cy="13" r="12" stroke="#fff" fill="#007dfc"/>');

/**
 * Refresh target.
 */
HoverIcons.prototype.refreshTarget = new mxImage((mxClient.IS_SVG) ? 'data:image/png;base64,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' :
	IMAGE_PATH + '/refresh.png', 38, 38);

/**
 * Tolerance for hover icon clicks.
 */
HoverIcons.prototype.tolerance = (mxClient.IS_TOUCH) ? 6 : 0;

/**
 * 
 */
HoverIcons.prototype.init = function()
{
	this.arrowUp = this.createArrow(this.triangleUp, mxResources.get('plusTooltip'));
	this.arrowRight = this.createArrow(this.triangleRight, mxResources.get('plusTooltip'));
	this.arrowDown = this.createArrow(this.triangleDown, mxResources.get('plusTooltip'));
	this.arrowLeft = this.createArrow(this.triangleLeft, mxResources.get('plusTooltip'));

	this.elts = [this.arrowUp, this.arrowRight, this.arrowDown, this.arrowLeft];

	this.repaintHandler = mxUtils.bind(this, function()
	{
		this.repaint();
	});

	this.graph.selectionModel.addListener(mxEvent.CHANGE, this.repaintHandler);
	this.graph.model.addListener(mxEvent.CHANGE, this.repaintHandler);
	this.graph.view.addListener(mxEvent.SCALE_AND_TRANSLATE, this.repaintHandler);
	this.graph.view.addListener(mxEvent.TRANSLATE, this.repaintHandler);
	this.graph.view.addListener(mxEvent.SCALE, this.repaintHandler);
	this.graph.view.addListener(mxEvent.DOWN, this.repaintHandler);
	this.graph.view.addListener(mxEvent.UP, this.repaintHandler);
	this.graph.addListener(mxEvent.ROOT, this.repaintHandler);
	
	// Resets the mouse point on escape
	this.graph.addListener(mxEvent.ESCAPE, mxUtils.bind(this, function()
	{
		this.mouseDownPoint = null;
	}));

	// Removes hover icons if mouse leaves the container
	mxEvent.addListener(this.graph.container, 'mouseleave',  mxUtils.bind(this, function(evt)
	{
		// Workaround for IE11 firing mouseleave for touch in diagram
		if (evt.relatedTarget != null && mxEvent.getSource(evt) == this.graph.container)
		{
			this.setDisplay('none');
		}
	}));
	
	// Resets current state when in-place editor starts
	this.graph.addListener(mxEvent.START_EDITING, mxUtils.bind(this, function(evt)
	{
		this.reset();
	}));
	
	// Resets current state after update of selection state for touch events
	var graphClick = this.graph.click;
	this.graph.click = mxUtils.bind(this, function(me)
	{
		graphClick.apply(this.graph, arguments);
		
		if (this.currentState != null && !this.graph.isCellSelected(this.currentState.cell) &&
			mxEvent.isTouchEvent(me.getEvent()) && !this.graph.model.isVertex(me.getCell()))
		{
			this.reset();
		}
	});
	
	// Checks if connection handler was active in mouse move
	// as workaround for possible double connection inserted
	var connectionHandlerActive = false;
	
	// Implements a listener for hover and click handling
	this.graph.addMouseListener(
	{
	    mouseDown: mxUtils.bind(this, function(sender, me)
	    {
	    	connectionHandlerActive = false;
	    	var evt = me.getEvent();
	    	
	    	if (this.isResetEvent(evt))
	    	{
	    		this.reset();
	    	}
	    	else if (!this.isActive())
	    	{
	    		var state = this.getState(me.getState());
	    		
	    		if (state != null || !mxEvent.isTouchEvent(evt))
	    		{
	    			this.update(state);
	    		}
	    	}
	    	
	    	this.setDisplay('none');
	    }),
	    mouseMove: mxUtils.bind(this, function(sender, me)
	    {
	    	var evt = me.getEvent();
	    	
	    	if (this.isResetEvent(evt))
	    	{
	    		this.reset();
	    	}
	    	else if (!this.graph.isMouseDown && !mxEvent.isTouchEvent(evt))
	    	{
	    		this.update(this.getState(me.getState()), me.getGraphX(), me.getGraphY());
	    	}
	    	
	    	if (this.graph.connectionHandler != null && this.graph.connectionHandler.shape != null)
	    	{
	    		connectionHandlerActive = true;
	    	}
	    }),
	    mouseUp: mxUtils.bind(this, function(sender, me)
	    {
	    	var evt = me.getEvent();
	    	
	    	if (this.isResetEvent(evt))
	    	{
	    		this.reset();
	    	}
	    	else if (this.isActive() && this.mouseDownPoint != null &&
	    		Math.abs(me.getGraphX() - this.mouseDownPoint.x) < this.graph.tolerance &&
		    	Math.abs(me.getGraphY() - this.mouseDownPoint.y) < this.graph.tolerance)
	    	{
	    		// Executes click event on highlighted arrow
	    		if (!connectionHandlerActive)
	    		{
	    			this.click(this.currentState, this.getDirection(), me);
	    		}
	    	}
	    	else if (this.isActive())
	    	{
	    		// Selects target vertex after drag and clone if not only new edge was inserted
	    		if (this.graph.getSelectionCount() != 1 || !this.graph.model.isEdge(this.graph.getSelectionCell()))
	    		{
	    			this.update(this.getState(this.graph.view.getState(this.graph.getCellAt(me.getGraphX(), me.getGraphY()))));
	    		}
	    		else
	    		{
	    			this.reset();
	    		}
	    	}
	    	else if (mxEvent.isTouchEvent(evt) || (this.bbox != null && mxUtils.contains(this.bbox, me.getGraphX(), me.getGraphY())))
	    	{
	    		// Shows existing hover icons if inside bounding box
	    		this.setDisplay('');
	    		this.repaint();
	    	}
	    	else if (!mxEvent.isTouchEvent(evt))
	    	{
	    		this.reset();
	    	}
	    	
	    	connectionHandlerActive = false;
	    	this.resetActiveArrow();
	    })
	});
};

/**
 * 
 */
HoverIcons.prototype.isResetEvent = function(evt, allowShift)
{
	return mxEvent.isAltDown(evt) || (this.activeArrow == null && mxEvent.isShiftDown(evt)) ||
		mxEvent.isMetaDown(evt) || (mxEvent.isPopupTrigger(evt) && !mxEvent.isControlDown(evt));
};

/**
 * 
 */
HoverIcons.prototype.createArrow = function(img, tooltip)
{
	var arrow = null;
	
	if (mxClient.IS_IE && !mxClient.IS_SVG)
	{
		// Workaround for PNG images in IE6
		if (mxClient.IS_IE6 && document.compatMode != 'CSS1Compat')
		{
			arrow = document.createElement(mxClient.VML_PREFIX + ':image');
			arrow.setAttribute('src', img.src);
			arrow.style.borderStyle = 'none';
		}
		else
		{
			arrow = document.createElement('div');
			arrow.style.backgroundImage = 'url(' + img.src + ')';
			arrow.style.backgroundPosition = 'center';
			arrow.style.backgroundRepeat = 'no-repeat';
		}
		
		arrow.style.width = (img.width + 4) + 'px';
		arrow.style.height = (img.height + 4) + 'px';
		arrow.style.display = (mxClient.IS_QUIRKS) ? 'inline' : 'inline-block';
	}
	else
	{
		arrow = mxUtils.createImage(img.src);
		arrow.style.width = img.width + 'px';
		arrow.style.height = img.height + 'px';
		arrow.style.padding = this.tolerance + 'px';
	}
	
	if (tooltip != null)
	{
		arrow.setAttribute('title', tooltip);
	}
	
	arrow.style.position = 'absolute';
	arrow.style.cursor = this.cssCursor;

	mxEvent.addGestureListeners(arrow, mxUtils.bind(this, function(evt)
	{
		if (this.currentState != null && !this.isResetEvent(evt))
		{
			this.mouseDownPoint = mxUtils.convertPoint(this.graph.container,
					mxEvent.getClientX(evt), mxEvent.getClientY(evt));
			this.drag(evt, this.mouseDownPoint.x, this.mouseDownPoint.y);
			this.activeArrow = arrow;
			this.setDisplay('none');
			mxEvent.consume(evt);
		}
	}));
	
	// Captures mouse events as events on graph
	mxEvent.redirectMouseEvents(arrow, this.graph, this.currentState);
	
	mxEvent.addListener(arrow, 'mouseenter', mxUtils.bind(this, function(evt)
	{
		// Workaround for Firefox firing mouseenter on touchend
		if (mxEvent.isMouseEvent(evt))
		{
	    	if (this.activeArrow != null && this.activeArrow != arrow)
	    	{
	    		mxUtils.setOpacity(this.activeArrow, this.inactiveOpacity);
	    	}

			this.graph.connectionHandler.constraintHandler.reset();
			mxUtils.setOpacity(arrow, 100);
			this.activeArrow = arrow;
		}
	}));
	
	mxEvent.addListener(arrow, 'mouseleave', mxUtils.bind(this, function(evt)
	{
		// Workaround for IE11 firing this event on touch
		if (!this.graph.isMouseDown)
		{
			this.resetActiveArrow();
		}
	}));
	
	return arrow;
};

/**
 * 
 */
HoverIcons.prototype.resetActiveArrow = function()
{
	if (this.activeArrow != null)
	{
		mxUtils.setOpacity(this.activeArrow, this.inactiveOpacity);
		this.activeArrow = null;
	}
};

/**
 * 
 */
HoverIcons.prototype.getDirection = function()
{
	var dir = mxConstants.DIRECTION_EAST;

	if (this.activeArrow == this.arrowUp)
	{
		dir = mxConstants.DIRECTION_NORTH;
	}
	else if (this.activeArrow == this.arrowDown)
	{
		dir = mxConstants.DIRECTION_SOUTH;
	}
	else if (this.activeArrow == this.arrowLeft)
	{
		dir = mxConstants.DIRECTION_WEST;
	}
		
	return dir;
};

/**
 * 
 */
HoverIcons.prototype.visitNodes = function(visitor)
{
	for (var i = 0; i < this.elts.length; i++)
	{
		if (this.elts[i] != null)
		{
			visitor(this.elts[i]);
		}
	}
};

/**
 * 
 */
HoverIcons.prototype.removeNodes = function()
{
	this.visitNodes(function(elt)
	{
		if (elt.parentNode != null)
		{
			elt.parentNode.removeChild(elt);
		}
	});
};

/**
 *
 */
HoverIcons.prototype.setDisplay = function(display)
{
	this.visitNodes(function(elt)
	{
		elt.style.display = display;
	});
};

/**
 *
 */
HoverIcons.prototype.isActive = function()
{
	return this.activeArrow != null && this.currentState != null;
};

/**
 *
 */
HoverIcons.prototype.drag = function(evt, x, y)
{
	this.graph.popupMenuHandler.hideMenu();
	this.graph.stopEditing(false);

	// Checks if state was removed in call to stopEditing above
	if (this.currentState != null)
	{
		this.graph.connectionHandler.start(this.currentState, x, y);
		this.graph.isMouseTrigger = mxEvent.isMouseEvent(evt);
		this.graph.isMouseDown = true;
		
		// Hides handles for selection cell
		var handler = this.graph.selectionCellsHandler.getHandler(this.currentState.cell);
		
		if (handler != null)
		{
			handler.setHandlesVisible(false);
		}
		
		// Uses elbow edges with vertical or horizontal direction
//		var direction = this.getDirection();
//		var elbowValue = (direction == mxConstants.DIRECTION_NORTH || direction == mxConstants.DIRECTION_SOUTH) ? 'vertical' : 'horizontal';
//		
//		var es = this.graph.connectionHandler.edgeState;
//		es.style['edgeStyle'] = 'elbowEdgeStyle';
//		es.style['elbow'] = elbowValue;
//		es.cell.style = mxUtils.setStyle(es.cell.style, 'edgeStyle', es.style['edgeStyle']);
//		es.cell.style = mxUtils.setStyle(es.cell.style, 'elbow', es.style['elbow']);
	}
};

/**
 *
 */
HoverIcons.prototype.getStateAt = function(state, x, y)
{
	return this.graph.view.getState(this.graph.getCellAt(x, y));
};

/**
 *
 */
HoverIcons.prototype.click = function(state, dir, me)
{
	var evt = me.getEvent();
	var x = me.getGraphX();
	var y = me.getGraphY();
	
	var tmp = this.getStateAt(state, x, y);
	
	if (tmp != null && this.graph.model.isEdge(tmp.cell) && !mxEvent.isControlDown(evt) &&
		(tmp.getVisibleTerminalState(true) == state || tmp.getVisibleTerminalState(false) == state))
	{
		this.graph.setSelectionCell(tmp.cell);
		this.reset();
	}
	else if (state != null)
	{
		var cells = this.graph.connectVertex(state.cell, dir, this.graph.defaultEdgeLength, evt);
		this.graph.selectCellsForConnectVertex(cells, evt, this);
		
		// Selects only target vertex if one exists
		if (cells.length == 2 && this.graph.model.isVertex(cells[1]))
		{
			this.graph.setSelectionCell(cells[1]);
			
			// Adds hover icons to new target vertex for touch devices
			if (mxEvent.isTouchEvent(evt))
			{
				this.update(this.getState(this.graph.view.getState(cells[1])));
			}
			else
			{
				// Hides hover icons after click with mouse
				this.reset();
			}
			
			this.graph.scrollCellToVisible(cells[1]);
		}
		else
		{
			this.graph.setSelectionCells(cells);
		}
	}
	
	me.consume();
};

/**
 * 
 */
HoverIcons.prototype.reset = function(clearTimeout)
{
	clearTimeout = (clearTimeout == null) ? true : clearTimeout;
	
	if (clearTimeout && this.updateThread != null)
	{
		window.clearTimeout(this.updateThread);
	}

	this.mouseDownPoint = null;
	this.currentState = null;
	this.activeArrow = null;
	this.removeNodes();
	this.bbox = null;
};

/**
 * 
 */
HoverIcons.prototype.repaint = function()
{
	this.bbox = null;
	
	if (this.currentState != null)
	{
		// Checks if cell was deleted
		this.currentState = this.getState(this.currentState);
		
		// Cell was deleted	
		if (this.currentState != null &&
			this.graph.model.isVertex(this.currentState.cell) &&
			this.graph.isCellConnectable(this.currentState.cell))
		{
			var bds = mxRectangle.fromRectangle(this.currentState);
			
			// Uses outer bounding box to take rotation into account
			if (this.currentState.shape != null && this.currentState.shape.boundingBox != null)
			{
				bds = mxRectangle.fromRectangle(this.currentState.shape.boundingBox);
			}

			bds.grow(this.graph.tolerance);
			bds.grow(this.arrowSpacing);
			
			var handler = this.graph.selectionCellsHandler.getHandler(this.currentState.cell);
			
			if (handler != null)
			{
				bds.x -= handler.horizontalOffset / 2;
				bds.y -= handler.verticalOffset / 2;
				bds.width += handler.horizontalOffset;
				bds.height += handler.verticalOffset;
				
				// Adds bounding box of rotation handle to avoid overlap
				if (handler.rotationShape != null && handler.rotationShape.node != null &&
					handler.rotationShape.node.style.visibility != 'hidden' &&
					handler.rotationShape.node.style.display != 'none' &&
					handler.rotationShape.boundingBox != null)
				{
					bds.add(handler.rotationShape.boundingBox);
				}
			}
			
			this.arrowUp.style.left = Math.round(this.currentState.getCenterX() - this.triangleUp.width / 2 - this.tolerance) + 'px';
			this.arrowUp.style.top = Math.round(bds.y - this.triangleUp.height - this.tolerance) + 'px';
			mxUtils.setOpacity(this.arrowUp, this.inactiveOpacity);
			
			this.arrowRight.style.left = Math.round(bds.x + bds.width - this.tolerance) + 'px';
			this.arrowRight.style.top = Math.round(this.currentState.getCenterY() - this.triangleRight.height / 2 - this.tolerance) + 'px';
			mxUtils.setOpacity(this.arrowRight, this.inactiveOpacity);
			
			this.arrowDown.style.left = this.arrowUp.style.left;
			this.arrowDown.style.top = Math.round(bds.y + bds.height - this.tolerance) + 'px';
			mxUtils.setOpacity(this.arrowDown, this.inactiveOpacity);
			
			this.arrowLeft.style.left = Math.round(bds.x - this.triangleLeft.width - this.tolerance) + 'px';
			this.arrowLeft.style.top = this.arrowRight.style.top;
			mxUtils.setOpacity(this.arrowLeft, this.inactiveOpacity);
			
			if (this.checkCollisions)
			{
				var right = this.graph.getCellAt(bds.x + bds.width +
						this.triangleRight.width / 2, this.currentState.getCenterY());
				var left = this.graph.getCellAt(bds.x - this.triangleLeft.width / 2, this.currentState.getCenterY()); 
				var top = this.graph.getCellAt(this.currentState.getCenterX(), bds.y - this.triangleUp.height / 2); 
				var bottom = this.graph.getCellAt(this.currentState.getCenterX(), bds.y + bds.height + this.triangleDown.height / 2); 

				// Shows hover icons large cell is behind all directions of current cell
				if (right != null && right == left && left == top && top == bottom)
				{
					right = null;
					left = null;
					top = null;
					bottom = null;
				}
				
				var currentGeo = this.graph.getCellGeometry(this.currentState.cell);
				
				var checkCollision = mxUtils.bind(this, function(cell, arrow)
				{
					var geo = this.graph.model.isVertex(cell) && this.graph.getCellGeometry(cell);
					
					// Ignores collision if vertex is more than 3 times the size of this vertex
					if (cell != null && !this.graph.model.isAncestor(cell, this.currentState.cell) &&
						(geo == null || currentGeo == null || (geo.height < 6 * currentGeo.height &&
						geo.width < 6 * currentGeo.width)))
					{
						arrow.style.visibility = 'hidden';
					}
					else
					{
						arrow.style.visibility = 'visible';
					}
				});
				
				checkCollision(right, this.arrowRight);
				checkCollision(left, this.arrowLeft);
				checkCollision(top, this.arrowUp);
				checkCollision(bottom, this.arrowDown);
			}
			else
			{
				this.arrowLeft.style.visibility = 'visible';
				this.arrowRight.style.visibility = 'visible';
				this.arrowUp.style.visibility = 'visible';
				this.arrowDown.style.visibility = 'visible';
			}
			
			if (this.graph.tooltipHandler.isEnabled())
			{
				this.arrowLeft.setAttribute('title', mxResources.get('plusTooltip'));
				this.arrowRight.setAttribute('title', mxResources.get('plusTooltip'));
				this.arrowUp.setAttribute('title', mxResources.get('plusTooltip'));
				this.arrowDown.setAttribute('title', mxResources.get('plusTooltip'));
			}
			else
			{
				this.arrowLeft.removeAttribute('title');
				this.arrowRight.removeAttribute('title');
				this.arrowUp.removeAttribute('title');
				this.arrowDown.removeAttribute('title');
			}
		}
		else
		{
			this.reset();
		}
		
		// Updates bounding box
		if (this.currentState != null)
		{
			this.bbox = this.computeBoundingBox();
			
			// Adds tolerance for hover
			if (this.bbox != null)
			{
				this.bbox.grow(10);
			}
		}
	}
};

/**
 * 
 */
HoverIcons.prototype.computeBoundingBox = function()
{
	var bbox = (!this.graph.model.isEdge(this.currentState.cell)) ? mxRectangle.fromRectangle(this.currentState) : null;
	
	this.visitNodes(function(elt)
	{
		if (elt.parentNode != null)
		{
			var tmp = new mxRectangle(elt.offsetLeft, elt.offsetTop, elt.offsetWidth, elt.offsetHeight);
			
			if (bbox == null)
			{
				bbox = tmp;
			}
			else
			{
				bbox.add(tmp);
			}
		}
	});
	
	return bbox;
};

/**
 * 
 */
HoverIcons.prototype.getState = function(state)
{
	if (state != null)
	{
		var cell = state.cell;

		// Uses connectable parent vertex if child is not connectable
		if (this.graph.getModel().isVertex(cell) && !this.graph.isCellConnectable(cell))
		{
			var parent = this.graph.getModel().getParent(cell);
			
			if (this.graph.getModel().isVertex(parent) && this.graph.isCellConnectable(parent))
			{
				cell = parent;
			}
		}
		
		// Ignores locked cells and edges
		if (this.graph.isCellLocked(cell) || this.graph.model.isEdge(cell))
		{
			cell = null;
		}
		
		state = this.graph.view.getState(cell);
	}
	
	return state;
};

/**
 * 
 */
HoverIcons.prototype.update = function(state, x, y)
{
	if (!this.graph.connectionArrowsEnabled)
	{
		this.reset();
	}
	else
	{
		var timeOnTarget = null;
		
		// Time on target
		if (this.prev != state || this.isActive())
		{
			this.startTime = new Date().getTime();
			this.prev = state;
			timeOnTarget = 0;
	
			if (this.updateThread != null)
			{
				window.clearTimeout(this.updateThread);
			}
			
			if (state != null)
			{
				// Starts timer to update current state with no mouse events
				this.updateThread = window.setTimeout(mxUtils.bind(this, function()
				{
					if (!this.isActive() && !this.graph.isMouseDown &&
						!this.graph.panningHandler.isActive())
					{
						this.prev = state;
						this.update(state, x, y);
					}
				}), this.updateDelay + 10);
			}
		}
		else if (this.startTime != null)
		{
			timeOnTarget = new Date().getTime() - this.startTime;
		}
		
		this.setDisplay('');
		
		if (this.currentState != null && this.currentState != state && timeOnTarget < this.activationDelay &&
			this.bbox != null && !mxUtils.contains(this.bbox, x, y))
		{
			this.reset(false);
		}
		else if (this.currentState != null || timeOnTarget > this.activationDelay)
		{
			if (this.currentState != state && ((timeOnTarget > this.updateDelay && state != null) ||
				this.bbox == null || x == null || y == null || !mxUtils.contains(this.bbox, x, y)))
			{
				if (state != null && this.graph.isEnabled())
				{
					this.removeNodes();
					this.setCurrentState(state);
					this.repaint();
					
					// Resets connection points on other focused cells
					if (this.graph.connectionHandler.constraintHandler.currentFocus != state)
					{
						this.graph.connectionHandler.constraintHandler.reset();
					}
				}
				else
				{
					this.reset();
				}
			}
		}
	}
};

/**
 * 
 */
HoverIcons.prototype.setCurrentState = function(state)
{
	if (state.style['portConstraint'] != 'eastwest')
	{
		this.graph.container.appendChild(this.arrowUp);
		this.graph.container.appendChild(this.arrowDown);
	}

	this.graph.container.appendChild(this.arrowRight);
	this.graph.container.appendChild(this.arrowLeft);
	this.currentState = state;
};

(function()
{
	
	/**
	 * Reset the list of processed edges.
	 */
	var mxGraphViewResetValidationState = mxGraphView.prototype.resetValidationState;
	
	mxGraphView.prototype.resetValidationState = function()
	{
		mxGraphViewResetValidationState.apply(this, arguments);
		
		this.validEdges = [];
	};
	
	/**
	 * Updates jumps for valid edges and repaints if needed.
	 */
	var mxGraphViewValidateCellState = mxGraphView.prototype.validateCellState;
	
	mxGraphView.prototype.validateCellState = function(cell, recurse)
	{
		var state = this.getState(cell);
		
		// Forces repaint if jumps change on a valid edge
		if (state != null && this.graph.model.isEdge(state.cell) &&
			state.style != null && state.style[mxConstants.STYLE_CURVED] != 1 &&
			!state.invalid && this.updateLineJumps(state))
		{
			this.graph.cellRenderer.redraw(state, false, this.isRendering());
		}
		
		state = mxGraphViewValidateCellState.apply(this, arguments);
		
		// Adds to the list of edges that may intersect with later edges
		if (state != null && this.graph.model.isEdge(state.cell) &&
			state.style[mxConstants.STYLE_CURVED] != 1)
		{
			// LATER: Reuse jumps for valid edges
			this.validEdges.push(state);
		}
		
		return state;
	};

	/**
	 * Forces repaint if routed points have changed.
	 */
	var mxCellRendererIsShapeInvalid = mxCellRenderer.prototype.isShapeInvalid;
	
	mxCellRenderer.prototype.isShapeInvalid = function(state, shape)
	{
		return mxCellRendererIsShapeInvalid.apply(this, arguments) ||
			(state.routedPoints != null && shape.routedPoints != null &&
			!mxUtils.equalPoints(shape.routedPoints, state.routedPoints))
	};

	
	/**
	 * Updates jumps for invalid edges.
	 */
	var mxGraphViewUpdateCellState = mxGraphView.prototype.updateCellState;
	
	mxGraphView.prototype.updateCellState = function(state)
	{
		mxGraphViewUpdateCellState.apply(this, arguments);

		// Updates jumps on invalid edge before repaint
		if (this.graph.model.isEdge(state.cell) &&
			state.style[mxConstants.STYLE_CURVED] != 1)
		{
			this.updateLineJumps(state);
		}
	};
	
	/**
	 * Updates the jumps between given state and processed edges.
	 */
	mxGraphView.prototype.updateLineJumps = function(state)
	{
		var pts = state.absolutePoints;
		
		if (Graph.lineJumpsEnabled)
		{
			var changed = state.routedPoints != null;
			var actual = null;
			
			if (pts != null && this.validEdges != null &&
				mxUtils.getValue(state.style, 'jumpStyle', 'none') !== 'none')
			{
				var thresh = 0.5 * this.scale;
				changed = false;
				actual = [];
				
				// Type 0 means normal waypoint, 1 means jump
				function addPoint(type, x, y)
				{
					var rpt = new mxPoint(x, y);
					rpt.type = type;
					
					actual.push(rpt);
					var curr = (state.routedPoints != null) ? state.routedPoints[actual.length - 1] : null;
					
					return curr == null || curr.type != type || curr.x != x || curr.y != y;
				};
				
				for (var i = 0; i < pts.length - 1; i++)
				{
					var p1 = pts[i + 1];
					var p0 = pts[i];
					var list = [];
					
					// Ignores waypoints on straight segments
					var pn = pts[i + 2];
					
					while (i < pts.length - 2 &&
						mxUtils.ptSegDistSq(p0.x, p0.y, pn.x, pn.y,
						p1.x, p1.y) < 1 * this.scale * this.scale)
					{
						p1 = pn;
						i++;
						pn = pts[i + 2];
					}
					
					changed = addPoint(0, p0.x, p0.y) || changed;
					
					// Processes all previous edges
					for (var e = 0; e < this.validEdges.length; e++)
					{
						var state2 = this.validEdges[e];
						var pts2 = state2.absolutePoints;
						
						if (pts2 != null && mxUtils.intersects(state, state2))
						{
							// Compares each segment of the edge with the current segment
							for (var j = 0; j < pts2.length - 1; j++)
							{
								var p3 = pts2[j + 1];
								var p2 = pts2[j];
								
								// Ignores waypoints on straight segments
								pn = pts2[j + 2];
								
								while (j < pts2.length - 2 &&
									mxUtils.ptSegDistSq(p2.x, p2.y, pn.x, pn.y,
									p3.x, p3.y) < 1 * this.scale * this.scale)
								{
									p3 = pn;
									j++;
									pn = pts2[j + 2];
								}
								
								var pt = mxUtils.intersection(p0.x, p0.y, p1.x, p1.y, p2.x, p2.y, p3.x, p3.y);
	
								// Handles intersection between two segments
								if (pt != null && (Math.abs(pt.x - p2.x) > thresh ||
									Math.abs(pt.y - p2.y) > thresh) &&
									(Math.abs(pt.x - p3.x) > thresh ||
									Math.abs(pt.y - p3.y) > thresh))
								{
									var dx = pt.x - p0.x;
									var dy = pt.y - p0.y;
									var temp = {distSq: dx * dx + dy * dy, x: pt.x, y: pt.y};
								
									// Intersections must be ordered by distance from start of segment
									for (var t = 0; t < list.length; t++)
									{
										if (list[t].distSq > temp.distSq)
										{
											list.splice(t, 0, temp);
											temp = null;
											
											break;
										}
									}
									
									// Ignores multiple intersections at segment joint
									if (temp != null && (list.length == 0 ||
										list[list.length - 1].x !== temp.x ||
										list[list.length - 1].y !== temp.y))
									{
										list.push(temp);
									}
								}
							}
						}
					}
					
					// Adds ordered intersections to routed points
					for (var j = 0; j < list.length; j++)
					{
						changed = addPoint(1, list[j].x, list[j].y) || changed;
					}
				}
	
				var pt = pts[pts.length - 1];
				changed = addPoint(0, pt.x, pt.y) || changed;
			}
			
			state.routedPoints = actual;
			
			return changed;
		}
		else
		{
			return false;
		}
	};
	
	/**
	 * Overrides painting the actual shape for taking into account jump style.
	 */
	var mxConnectorPaintLine = mxConnector.prototype.paintLine;

	mxConnector.prototype.paintLine = function (c, absPts, rounded)
	{
		// Required for checking dirty state
		this.routedPoints = (this.state != null) ? this.state.routedPoints : null;
		
		if (this.outline || this.state == null || this.style == null ||
			this.state.routedPoints == null || this.state.routedPoints.length == 0)
		{
			mxConnectorPaintLine.apply(this, arguments);
		}
		else
		{
			var arcSize = mxUtils.getValue(this.style, mxConstants.STYLE_ARCSIZE,
				mxConstants.LINE_ARCSIZE) / 2;
			var size = (parseInt(mxUtils.getValue(this.style, 'jumpSize',
				Graph.defaultJumpSize)) - 2) / 2 + this.strokewidth;
			var style = mxUtils.getValue(this.style, 'jumpStyle', 'none');
			var f = Editor.jumpSizeRatio;
			var moveTo = true;
			var last = null;
			var len = null;
			var pts = [];
			var n = null;
			c.begin();
			
			for (var i = 0; i < this.state.routedPoints.length; i++)
			{
				var rpt = this.state.routedPoints[i];
				var pt = new mxPoint(rpt.x / this.scale, rpt.y / this.scale);
				
				// Takes first and last point from passed-in array
				if (i == 0)
				{
					pt = absPts[0];
				}
				else if (i == this.state.routedPoints.length - 1)
				{
					pt = absPts[absPts.length - 1];
				}
				
				var done = false;

				// Type 1 is an intersection
				if (last != null && rpt.type == 1)
				{
					// Checks if next/previous points are too close
					var next = this.state.routedPoints[i + 1];
					var dx = next.x / this.scale - pt.x;
					var dy = next.y / this.scale - pt.y;
					var dist = dx * dx + dy * dy;

					if (n == null)
					{
						n = new mxPoint(pt.x - last.x, pt.y - last.y);
						len = Math.sqrt(n.x * n.x + n.y * n.y);
						n.x = n.x * size / len;
						n.y = n.y * size / len;
					}
					
					if (dist > size * size && len > 0)
					{
						var dx = last.x - pt.x;
						var dy = last.y - pt.y;
						var dist = dx * dx + dy * dy;
						
						if (dist > size * size)
						{
							var p0 = new mxPoint(pt.x - n.x, pt.y - n.y);
							var p1 = new mxPoint(pt.x + n.x, pt.y + n.y);
							pts.push(p0);
							
							this.addPoints(c, pts, rounded, arcSize, false, null, moveTo);
							
							var f = (Math.round(n.x) < 0 || (Math.round(n.x) == 0
									&& Math.round(n.y) <= 0)) ? 1 : -1;
							moveTo = false;

							if (style == 'sharp')
							{
								c.lineTo(p0.x - n.y * f, p0.y + n.x * f);
								c.lineTo(p1.x - n.y * f, p1.y + n.x * f);
								c.lineTo(p1.x, p1.y);
							}
							else if (style == 'arc')
							{
								f *= 1.3;
								c.curveTo(p0.x - n.y * f, p0.y + n.x * f,
									p1.x - n.y * f, p1.y + n.x * f,
									p1.x, p1.y);
							}
							else
							{
								c.moveTo(p1.x, p1.y);
								moveTo = true;
							}
	
							pts = [p1];
							done = true;
						}
					}
				}
				else
				{
					n = null;
				}
				
				if (!done)
				{
					pts.push(pt);
					last = pt;
				}
			}
			
			this.addPoints(c, pts, rounded, arcSize, false, null, moveTo);
			c.stroke();
		}
	};
	
	/**
	 * Adds support for snapToPoint style.
	 */
	var mxGraphViewUpdateFloatingTerminalPoint = mxGraphView.prototype.updateFloatingTerminalPoint;
	
	mxGraphView.prototype.updateFloatingTerminalPoint = function(edge, start, end, source)
	{
		if (start != null && edge != null &&
			(start.style['snapToPoint'] == '1' ||
			edge.style['snapToPoint'] == '1'))
		{
		    start = this.getTerminalPort(edge, start, source);
		    var next = this.getNextPoint(edge, end, source);
		    
		    var orth = this.graph.isOrthogonal(edge);
		    var alpha = mxUtils.toRadians(Number(start.style[mxConstants.STYLE_ROTATION] || '0'));
		    var center = new mxPoint(start.getCenterX(), start.getCenterY());
		    
		    if (alpha != 0)
		    {
		        var cos = Math.cos(-alpha);
		        var sin = Math.sin(-alpha);
		        next = mxUtils.getRotatedPoint(next, cos, sin, center);
		    }
		    
		    var border = parseFloat(edge.style[mxConstants.STYLE_PERIMETER_SPACING] || 0);
		    border += parseFloat(edge.style[(source) ?
		        mxConstants.STYLE_SOURCE_PERIMETER_SPACING :
		        mxConstants.STYLE_TARGET_PERIMETER_SPACING] || 0);
		    var pt = this.getPerimeterPoint(start, next, alpha == 0 && orth, border);
		
		    if (alpha != 0)
		    {
		        var cos = Math.cos(alpha);
		        var sin = Math.sin(alpha);
		        pt = mxUtils.getRotatedPoint(pt, cos, sin, center);
		    }
		    
		    edge.setAbsoluteTerminalPoint(this.snapToAnchorPoint(edge, start, end, source, pt), source);
		}
		else
		{
			mxGraphViewUpdateFloatingTerminalPoint.apply(this, arguments);
		}
	};

	mxGraphView.prototype.snapToAnchorPoint = function(edge, start, end, source, pt)
	{
		if (start != null && edge != null)
		{
	        var constraints = this.graph.getAllConnectionConstraints(start)
	        var nearest = null;
	        var dist = null;
	    
	        for (var i = 0; i < constraints.length; i++)
	        {
	            var cp = this.graph.getConnectionPoint(start, constraints[i]);
	            
	            if (cp != null)
	            {
	                var tmp = (cp.x - pt.x) * (cp.x - pt.x) + (cp.y - pt.y) * (cp.y - pt.y);
	            
	                if (dist == null || tmp < dist)
	                {
	                    nearest = cp;
	                    dist = tmp;
	                }
	            }
	        }
	        
	        if (nearest != null)
	        {
	            pt = nearest;
	        }
		}
		
		return pt;
	};
		
	/**
	 * Adds support for placeholders in text elements of shapes.
	 */
	var mxStencilEvaluateTextAttribute = mxStencil.prototype.evaluateTextAttribute;
	
	mxStencil.prototype.evaluateTextAttribute = function(node, attribute, shape)
	{
		var result = mxStencilEvaluateTextAttribute.apply(this, arguments);
		var placeholders = node.getAttribute('placeholders');
		
		if (placeholders == '1' && shape.state != null)
		{
			result = shape.state.view.graph.replacePlaceholders(shape.state.cell, result);
		}
		
		return result;
	};
		
	/**
	 * Adds custom stencils defined via shape=stencil(value) style. The value is a base64 encoded, compressed and
	 * URL encoded XML definition of the shape according to the stencil definition language of mxGraph.
	 * 
	 * Needs to be in this file to make sure its part of the embed client code. Also the check for ZLib is
	 * different than for the Editor code.
	 */
	var mxCellRendererCreateShape = mxCellRenderer.prototype.createShape;
	mxCellRenderer.prototype.createShape = function(state)
	{
		if (state.style != null && typeof(pako) !== 'undefined')
		{
	    	var shape = mxUtils.getValue(state.style, mxConstants.STYLE_SHAPE, null);
	
	    	// Extracts and decodes stencil XML if shape has the form shape=stencil(value)
	    	if (shape != null && shape.substring(0, 8) == 'stencil(')
	    	{
	    		try
	    		{
	    			var stencil = shape.substring(8, shape.length - 1);
	    			var doc = mxUtils.parseXml(state.view.graph.decompress(stencil));
	    			
	    			return new mxShape(new mxStencil(doc.documentElement));
	    		}
	    		catch (e)
	    		{
	    			if (window.console != null)
	    			{
	    				console.log('Error in shape: ' + e);
	    			}
	    		}
	    	}
		}
		
		return mxCellRendererCreateShape.apply(this, arguments);
	};
})();

/**
 * Overrides stencil registry for dynamic loading of stencils.
 */
/**
 * Maps from library names to an array of Javascript filenames,
 * which are synchronously loaded. Currently only stencil files
 * (.xml) and JS files (.js) are supported.
 * IMPORTANT: For embedded diagrams to work entries must also
 * be added in EmbedServlet.java.
 */
mxStencilRegistry.libraries = {};

/**
 * Global switch to disable dynamic loading.
 */
mxStencilRegistry.dynamicLoading = true;

/**
 * Global switch to disable eval for JS (preload all JS instead).
 */
mxStencilRegistry.allowEval = true;

/**
 * Stores all package names that have been dynamically loaded.
 * Each package is only loaded once.
 */
mxStencilRegistry.packages = [];

// Extends the default stencil registry to add dynamic loading
mxStencilRegistry.getStencil = function(name)
{
	var result = mxStencilRegistry.stencils[name];
	
	if (result == null && mxCellRenderer.defaultShapes[name] == null && mxStencilRegistry.dynamicLoading)
	{
		var basename = mxStencilRegistry.getBasenameForStencil(name);
		
		// Loads stencil files and tries again
		if (basename != null)
		{
			var libs = mxStencilRegistry.libraries[basename];

			if (libs != null)
			{
				if (mxStencilRegistry.packages[basename] == null)
				{
					for (var i = 0; i < libs.length; i++)
					{
						var fname = libs[i];
						
						if (fname.toLowerCase().substring(fname.length - 4, fname.length) == '.xml')
						{
							mxStencilRegistry.loadStencilSet(fname, null);
						}
						else if (fname.toLowerCase().substring(fname.length - 3, fname.length) == '.js')
						{
							try
							{
								if (mxStencilRegistry.allowEval)
								{
									var req = mxUtils.load(fname);
									
									if (req != null && req.getStatus() >= 200 && req.getStatus() <= 299)
									{
										eval.call(window, req.getText());
									}
								}
							}
							catch (e)
							{
								if (window.console != null)
								{
									console.log('error in getStencil:', fname, e);
								}
							}
						}
						else
						{
							// FIXME: This does not yet work as the loading is triggered after
							// the shape was used in the graph, at which point the keys have
							// typically been translated in the calling method.
							//mxResources.add(fname);
						}
					}

					mxStencilRegistry.packages[basename] = 1;
				}
			}
			else
			{
				// Replaces '_-_' with '_'
				basename = basename.replace('_-_', '_');
				mxStencilRegistry.loadStencilSet(STENCIL_PATH + '/' + basename + '.xml', null);
			}
			
			result = mxStencilRegistry.stencils[name];
		}
	}
	
	return result;
};

// Returns the basename for the given stencil or null if no file must be
// loaded to render the given stencil.
mxStencilRegistry.getBasenameForStencil = function(name)
{
	var tmp = null;
	
	if (name != null)
	{
		var parts = name.split('.');
		
		if (parts.length > 0 && parts[0] == 'mxgraph')
		{
			tmp = parts[1];
			
			for (var i = 2; i < parts.length - 1; i++)
			{
				tmp += '/' + parts[i];
			}
		}
	}

	return tmp;
};

// Loads the given stencil set
mxStencilRegistry.loadStencilSet = function(stencilFile, postStencilLoad, force, async)
{
	force = (force != null) ? force : false;
	
	// Uses additional cache for detecting previous load attempts
	var xmlDoc = mxStencilRegistry.packages[stencilFile];
	
	if (force || xmlDoc == null)
	{
		var install = false;
		
		if (xmlDoc == null)
		{
			try
			{
				if (async)
				{
					mxStencilRegistry.loadStencil(stencilFile, mxUtils.bind(this, function(xmlDoc2)
					{
						if (xmlDoc2 != null && xmlDoc2.documentElement != null)
						{
							mxStencilRegistry.packages[stencilFile] = xmlDoc2;
							install = true;
							mxStencilRegistry.parseStencilSet(xmlDoc2.documentElement, postStencilLoad, install);
						}
					}));
				
					return;
				}
				else
				{
					xmlDoc = mxStencilRegistry.loadStencil(stencilFile);
					mxStencilRegistry.packages[stencilFile] = xmlDoc;
					install = true;
				}
			}
			catch (e)
			{
				if (window.console != null)
				{
					console.log('error in loadStencilSet:', stencilFile, e);
				}
			}
		}
	
		if (xmlDoc != null && xmlDoc.documentElement != null)
		{
			mxStencilRegistry.parseStencilSet(xmlDoc.documentElement, postStencilLoad, install);
		}
	}
};

// Loads the given stencil XML file.
mxStencilRegistry.loadStencil = function(filename, fn)
{
	if (fn != null)
	{
		var req = mxUtils.get(filename, mxUtils.bind(this, function(req)
		{
			fn((req.getStatus() >= 200 && req.getStatus() <= 299) ? req.getXml() : null);
		}));
	}
	else
	{
		return mxUtils.load(filename).getXml();
	}
};

// Takes array of strings
mxStencilRegistry.parseStencilSets = function(stencils)
{
	for (var i = 0; i < stencils.length; i++)
	{
		mxStencilRegistry.parseStencilSet(mxUtils.parseXml(stencils[i]).documentElement);
	}
};

// Parses the given stencil set
mxStencilRegistry.parseStencilSet = function(root, postStencilLoad, install)
{
	if (root.nodeName == 'stencils')
	{
		var shapes = root.firstChild;
		
		while (shapes != null)
		{
			if (shapes.nodeName == 'shapes')
			{
				mxStencilRegistry.parseStencilSet(shapes, postStencilLoad, install);
			}
			
			shapes = shapes.nextSibling;
		}
	}
	else
	{
		install = (install != null) ? install : true;
		var shape = root.firstChild;
		var packageName = '';
		var name = root.getAttribute('name');
		
		if (name != null)
		{
			packageName = name + '.';
		}
		
		while (shape != null)
		{
			if (shape.nodeType == mxConstants.NODETYPE_ELEMENT)
			{
				name = shape.getAttribute('name');
				
				if (name != null)
				{
					packageName = packageName.toLowerCase();
					var stencilName = name.replace(/ /g,"_");
						
					if (install)
					{
						mxStencilRegistry.addStencil(packageName + stencilName.toLowerCase(), new mxStencil(shape));
					}
	
					if (postStencilLoad != null)
					{
						var w = shape.getAttribute('w');
						var h = shape.getAttribute('h');
						
						w = (w == null) ? 80 : parseInt(w, 10);
						h = (h == null) ? 80 : parseInt(h, 10);
	
						postStencilLoad(packageName, stencilName, name, w, h);
					}
				}
			}
			
			shape = shape.nextSibling;
		}
	}
};

/**
 * These overrides are only added if mxVertexHandler is defined (ie. not in embedded graph)
 */
if (typeof mxVertexHandler != 'undefined')
{
	(function()
	{
		// Sets colors for handles
		mxConstants.HANDLE_FILLCOLOR = '#99ccff';
		mxConstants.HANDLE_STROKECOLOR = '#0088cf';
		mxConstants.VERTEX_SELECTION_COLOR = '#00a8ff';
		mxConstants.OUTLINE_COLOR = '#00a8ff';
		mxConstants.OUTLINE_HANDLE_FILLCOLOR = '#99ccff';
		mxConstants.OUTLINE_HANDLE_STROKECOLOR = '#00a8ff';
		mxConstants.CONNECT_HANDLE_FILLCOLOR = '#cee7ff';
		mxConstants.EDGE_SELECTION_COLOR = '#00a8ff';
		mxConstants.DEFAULT_VALID_COLOR = '#00a8ff';
		mxConstants.LABEL_HANDLE_FILLCOLOR = '#cee7ff';
		mxConstants.GUIDE_COLOR = '#0088cf';
		mxConstants.HIGHLIGHT_OPACITY = 30;
		mxConstants.HIGHLIGHT_SIZE = 8;
		
		// Enables snapping to off-grid terminals for edge waypoints
		mxEdgeHandler.prototype.snapToTerminals = true;
	
		// Enables guides
		mxGraphHandler.prototype.guidesEnabled = true;
	
		// Enables fading of rubberband
		mxRubberband.prototype.fadeOut = true;
		
		// Alt-move disables guides
		mxGuide.prototype.isEnabledForEvent = function(evt)
		{
			return !mxEvent.isAltDown(evt);
		};
		
		// Extends connection handler to enable ctrl+drag for cloning source cell
		// since copyOnConnect is now disabled by default
		var mxConnectionHandlerCreateTarget = mxConnectionHandler.prototype.isCreateTarget;
		mxConnectionHandler.prototype.isCreateTarget = function(evt)
		{
			return mxEvent.isControlDown(evt) || mxConnectionHandlerCreateTarget.apply(this, arguments);
		};

		// Overrides highlight shape for connection points
		mxConstraintHandler.prototype.createHighlightShape = function()
		{
			var hl = new mxEllipse(null, this.highlightColor, this.highlightColor, 0);
			hl.opacity = mxConstants.HIGHLIGHT_OPACITY;
			
			return hl;
		};
		
		// Overrides edge preview to use current edge shape and default style
		mxConnectionHandler.prototype.livePreview = true;
		mxConnectionHandler.prototype.cursor = 'crosshair';
		
		// Uses current edge style for connect preview
		mxConnectionHandler.prototype.createEdgeState = function(me)
		{
			var style = this.graph.createCurrentEdgeStyle();
			var edge = this.graph.createEdge(null, null, null, null, null, style);
			var state = new mxCellState(this.graph.view, edge, this.graph.getCellStyle(edge));
			
			for (var key in this.graph.currentEdgeStyle)
			{
				state.style[key] = this.graph.currentEdgeStyle[key];
			}
			
			return state;
		};

		// Overrides dashed state with current edge style
		var connectionHandlerCreateShape = mxConnectionHandler.prototype.createShape;
		mxConnectionHandler.prototype.createShape = function()
		{
			var shape = connectionHandlerCreateShape.apply(this, arguments);
			
			shape.isDashed = this.graph.currentEdgeStyle[mxConstants.STYLE_DASHED] == '1';
			
			return shape;
		}
		
		// Overrides live preview to keep current style
		mxConnectionHandler.prototype.updatePreview = function(valid)
		{
			// do not change color of preview
		};
		
		// Overrides connection handler to ignore edges instead of not allowing connections
		var mxConnectionHandlerCreateMarker = mxConnectionHandler.prototype.createMarker;
		mxConnectionHandler.prototype.createMarker = function()
		{
			var marker = mxConnectionHandlerCreateMarker.apply(this, arguments);
		
			var markerGetCell = marker.getCell;
			marker.getCell = mxUtils.bind(this, function(me)
			{
				var result = markerGetCell.apply(this, arguments);
			
				this.error = null;
				
				return result;
			});
			
			return marker;
		};
		
		/**
		 * 
		 */
		Graph.prototype.defaultVertexStyle = {};

		/**
		 * Contains the default style for edges.
		 */
		Graph.prototype.defaultEdgeStyle = {'edgeStyle': 'orthogonalEdgeStyle', 'rounded': '0',
			'jettySize': 'auto', 'orthogonalLoop': '1'};

		/**
		 * Returns the current edge style as a string.
		 */
		Graph.prototype.createCurrentEdgeStyle = function()
		{
			var style = 'edgeStyle=' + (this.currentEdgeStyle['edgeStyle'] || 'none') + ';';
			
			if (this.currentEdgeStyle['shape'] != null)
			{
				style += 'shape=' + this.currentEdgeStyle['shape'] + ';';
			}
			
			if (this.currentEdgeStyle['curved'] != null)
			{
				style += 'curved=' + this.currentEdgeStyle['curved'] + ';';
			}
			
			if (this.currentEdgeStyle['rounded'] != null)
			{
				style += 'rounded=' + this.currentEdgeStyle['rounded'] + ';';
			}

			if (this.currentEdgeStyle['comic'] != null)
			{
				style += 'comic=' + this.currentEdgeStyle['comic'] + ';';
			}

			if (this.currentEdgeStyle['jumpStyle'] != null)
			{
				style += 'jumpStyle=' + this.currentEdgeStyle['jumpStyle'] + ';';
			}

			if (this.currentEdgeStyle['jumpSize'] != null)
			{
				style += 'jumpSize=' + this.currentEdgeStyle['jumpSize'] + ';';
			}
			
			// Special logic for custom property of elbowEdgeStyle
			if (this.currentEdgeStyle['edgeStyle'] == 'elbowEdgeStyle' && this.currentEdgeStyle['elbow'] != null)
			{
				style += 'elbow=' + this.currentEdgeStyle['elbow'] + ';';
			}
			
			if (this.currentEdgeStyle['html'] != null)
			{
				style += 'html=' + this.currentEdgeStyle['html'] + ';';
			}
			else
			{
				style += 'html=1;';
			}
			
			return style;
		};
	
		/**
		 * Hook for subclassers.
		 */
		Graph.prototype.getPagePadding = function()
		{
			return new mxPoint(0, 0);
		};
		
		/**
		 * Loads the stylesheet for this graph.
		 */
		Graph.prototype.loadStylesheet = function()
		{
			var node = (this.themes != null) ? this.themes[this.defaultThemeName] :
				(!mxStyleRegistry.dynamicLoading) ? null :
				mxUtils.load(STYLE_PATH + '/default.xml').getDocumentElement();
			
			if (node != null)
			{
				var dec = new mxCodec(node.ownerDocument);
				dec.decode(node, this.getStylesheet());
			}
		};
		
		/**
		 * 
		 */
		Graph.prototype.importGraphModel = function(node, dx, dy, crop)
		{
			dx = (dx != null) ? dx : 0;
			dy = (dy != null) ? dy : 0;
			
			var cells = []
			var model = new mxGraphModel();
			var codec = new mxCodec(node.ownerDocument);
			codec.decode(node, model);
			
			var childCount = model.getChildCount(model.getRoot());
			var targetChildCount = this.model.getChildCount(this.model.getRoot());
			
			// Merges into active layer if one layer is pasted
			this.model.beginUpdate();
			try
			{
				// Mapping for multiple calls to cloneCells with the same set of cells
				var mapping = new Object();
				
				for (var i = 0; i < childCount; i++)
				{
					var parent = model.getChildAt(model.getRoot(), i);
					
					// Adds cells to existing layer if not locked
					if (childCount == 1 && !this.isCellLocked(this.getDefaultParent()))
					{
						var children = model.getChildren(parent);
						cells = cells.concat(this.importCells(children, dx, dy, this.getDefaultParent(), null, mapping));
					}
					else
					{
						// Delta is non cascading, needs separate move for layers
						parent = this.importCells([parent], 0, 0, this.model.getRoot(), null, mapping)[0];
						var children = this.model.getChildren(parent);
						this.moveCells(children, dx, dy);
						cells = cells.concat(children);
					}
				}
				
				if (crop)
				{
					if (this.isGridEnabled())
					{
						dx = this.snap(dx);
						dy = this.snap(dy);
					}
					
					var bounds = this.getBoundingBoxFromGeometry(cells, true);
					
					if (bounds != null)
					{
						this.moveCells(cells, dx - bounds.x, dy - bounds.y);
					}
				}
			}
			finally
			{
				this.model.endUpdate();
			}
			
			return cells;
		}
		
		/**
		 * Overrides method to provide connection constraints for shapes.
		 */
		Graph.prototype.getAllConnectionConstraints = function(terminal, source)
		{
			if (terminal != null)
			{
				var constraints = mxUtils.getValue(terminal.style, 'points', null);
				
				if (constraints != null)
				{
					// Requires an array of arrays with x, y (0..1) and an optional
					// perimeter (0 or 1), eg. points=[[0,0,1],[0,1,0],[1,1]]
					var result = [];
					
					try
					{
						var c = JSON.parse(constraints);
						
						for (var i = 0; i < c.length; i++)
						{
							var tmp = c[i];
							result.push(new mxConnectionConstraint(new mxPoint(tmp[0], tmp[1]), (tmp.length > 2) ? tmp[2] != '0' : true));
						}
					}
					catch (e)
					{
						// ignore
					}
					
					return result;
				}
				else
				{
					if (terminal.shape != null)
					{
						if (terminal.shape.stencil != null)
						{
							if (terminal.shape.stencil != null)
							{
								return terminal.shape.stencil.constraints;
							}
						}
						else if (terminal.shape.constraints != null)
						{
							return terminal.shape.constraints;
						}
					}
				}
			}
		
			return null;
		};
		
		/**
		 * Inverts the elbow edge style without removing existing styles.
		 */
		Graph.prototype.flipEdge = function(edge)
		{
			if (edge != null)
			{
				var state = this.view.getState(edge);
				var style = (state != null) ? state.style : this.getCellStyle(edge);
				
				if (style != null)
				{
					var elbow = mxUtils.getValue(style, mxConstants.STYLE_ELBOW,
						mxConstants.ELBOW_HORIZONTAL);
					var value = (elbow == mxConstants.ELBOW_HORIZONTAL) ?
						mxConstants.ELBOW_VERTICAL : mxConstants.ELBOW_HORIZONTAL;
					this.setCellStyles(mxConstants.STYLE_ELBOW, value, [edge]);
				}
			}
		};

		/**
		 * Disables drill-down for non-swimlanes.
		 */
		Graph.prototype.isValidRoot = function(cell)
		{
			// Counts non-relative children
			var childCount = this.model.getChildCount(cell);
			var realChildCount = 0;
			
			for (var i = 0; i < childCount; i++)
			{
				var child = this.model.getChildAt(cell, i);
				
				if (this.model.isVertex(child))
				{
					var geometry = this.getCellGeometry(child);
					
					if (geometry != null && !geometry.relative)
					{
						realChildCount++;
					}
				}
			}
			
			return realChildCount > 0 || this.isContainer(cell);
		};
		
		/**
		 * Disables drill-down for non-swimlanes.
		 */
		Graph.prototype.isValidDropTarget = function(cell)
		{
			var state = this.view.getState(cell);
			var style = (state != null) ? state.style : this.getCellStyle(cell);
		
			return mxUtils.getValue(style, 'part', '0') != '1' && (this.isContainer(cell) ||
				(mxGraph.prototype.isValidDropTarget.apply(this, arguments) &&
				mxUtils.getValue(style, 'dropTarget', '1') != '0'));
		};
	
		/**
		 * Overrides createGroupCell to set the group style for new groups to 'group'.
		 */
		Graph.prototype.createGroupCell = function()
		{
			var group = mxGraph.prototype.createGroupCell.apply(this, arguments);
			group.setStyle('group');
			
			return group;
		};
		
		/**
		 * Disables extending parents with stack layouts on add
		 */
		Graph.prototype.isExtendParentsOnAdd = function(cell)
		{
			var result = mxGraph.prototype.isExtendParentsOnAdd.apply(this, arguments);
			
			if (result && cell != null && this.layoutManager != null)
			{
				var parent = this.model.getParent(cell);
				
				if (parent != null)
				{
					var layout = this.layoutManager.getLayout(parent);
					
					if (layout != null && layout.constructor == mxStackLayout)
					{
						result = false;
					}
				}
			}
			
			return result;
		};

		/**
		 * Overrides autosize to add a border.
		 */
		Graph.prototype.getPreferredSizeForCell = function(cell)
		{
			var result = mxGraph.prototype.getPreferredSizeForCell.apply(this, arguments);
			
			// Adds buffer
			if (result != null)
			{
				result.width += 10;
				result.height += 4;
				
				if (this.gridEnabled)
				{
					result.width = this.snap(result.width);
					result.height = this.snap(result.height);
				}
			}
			
			return result;
		}

		/**
		 * Turns the given cells and returns the changed cells.
		 */
		Graph.prototype.turnShapes = function(cells)
		{
			var model = this.getModel();
			var select = [];
			
			model.beginUpdate();
			try
			{
				for (var i = 0; i < cells.length; i++)
				{
					var cell = cells[i];
					
					if (model.isEdge(cell))
					{
						var src = model.getTerminal(cell, true);
						var trg = model.getTerminal(cell, false);
						
						model.setTerminal(cell, trg, true);
						model.setTerminal(cell, src, false);
						
						var geo = model.getGeometry(cell);
						
						if (geo != null)
						{
							geo = geo.clone();
							
							if (geo.points != null)
							{
								geo.points.reverse();
							}
							
							var sp = geo.getTerminalPoint(true);
							var tp = geo.getTerminalPoint(false)
							
							geo.setTerminalPoint(sp, false);
							geo.setTerminalPoint(tp, true);
							model.setGeometry(cell, geo);
							
							// Inverts constraints
							var edgeState = this.view.getState(cell);
							var sourceState = this.view.getState(src);
							var targetState = this.view.getState(trg);
							
							if (edgeState != null)
							{
								var sc = (sourceState != null) ? this.getConnectionConstraint(edgeState, sourceState, true) : null;
								var tc = (targetState != null) ? this.getConnectionConstraint(edgeState, targetState, false) : null;
								
								this.setConnectionConstraint(cell, src, true, tc);
								this.setConnectionConstraint(cell, trg, false, sc);
							}
		
							select.push(cell);
						}
					}
					else if (model.isVertex(cell))
					{
						var geo = this.getCellGeometry(cell);
			
						if (geo != null)
						{
							// Rotates the size and position in the geometry
							geo = geo.clone();
							geo.x += geo.width / 2 - geo.height / 2;
							geo.y += geo.height / 2 - geo.width / 2;
							var tmp = geo.width;
							geo.width = geo.height;
							geo.height = tmp;
							model.setGeometry(cell, geo);
							
							// Reads the current direction and advances by 90 degrees
							var state = this.view.getState(cell);
							
							if (state != null)
							{
								var dir = state.style[mxConstants.STYLE_DIRECTION] || 'east'/*default*/;
								
								if (dir == 'east')
								{
									dir = 'south';
								}
								else if (dir == 'south')
								{
									dir = 'west';
								}
								else if (dir == 'west')
								{
									dir = 'north';
								}
								else if (dir == 'north')
								{
									dir = 'east';
								}
								
								this.setCellStyles(mxConstants.STYLE_DIRECTION, dir, [cell]);
							}
		
							select.push(cell);
						}
					}
				}
			}
			finally
			{
				model.endUpdate();
			}
			
			return select;
		};
		
		/**
		 * Updates the child cells with placeholders if metadata of a cell has changed.
		 */
		Graph.prototype.processChange = function(change)
		{
			mxGraph.prototype.processChange.apply(this, arguments);
			
			if (change instanceof mxValueChange && change.cell != null &&
				change.cell.value != null && typeof(change.cell.value) == 'object')
			{
				// Invalidates all descendants with placeholders
				var desc = this.model.getDescendants(change.cell);
				
				// LATER: Check if only label or tooltip have changed
				if (desc.length > 0)
				{
					for (var i = 0; i < desc.length; i++)
					{
						if (this.isReplacePlaceholders(desc[i]))
						{
							this.view.invalidate(desc[i], false, false);
						}
					}
				}
			}
		};
		
		/**
		 * Replaces the given element with a span.
		 */
		Graph.prototype.replaceElement = function(elt, tagName)
		{
			var span = elt.ownerDocument.createElement((tagName != null) ? tagName : 'span');
			var attributes = Array.prototype.slice.call(elt.attributes);
			
			while (attr = attributes.pop())
			{
				span.setAttribute(attr.nodeName, attr.nodeValue);
			}
			
			span.innerHTML = elt.innerHTML;
			elt.parentNode.replaceChild(span, elt);
		};
		
		/**
		 * Handles label changes for XML user objects.
		 */
		Graph.prototype.updateLabelElements = function(cells, fn, tagName)
		{
			cells = (cells != null) ? cells : this.getSelectionCells();
			var div = document.createElement('div');
			
			for (var i = 0; i < cells.length; i++)
			{
				// Changes font tags inside HTML labels
				if (this.isHtmlLabel(cells[i]))
				{
					var label = this.convertValueToString(cells[i]);
					
					if (label != null && label.length > 0)
					{
						div.innerHTML = label;
						var elts = div.getElementsByTagName((tagName != null) ? tagName : '*');
						
						for (var j = 0; j < elts.length; j++)
						{
							fn(elts[j]);
						}
						
						if (div.innerHTML != label)
						{
							this.cellLabelChanged(cells[i], div.innerHTML);
						}
					}
				}
			}
		};
		
		/**
		 * Handles label changes for XML user objects.
		 */
		Graph.prototype.cellLabelChanged = function(cell, value, autoSize)
		{
			// Removes all illegal control characters in user input
			value = this.zapGremlins(value);

			this.model.beginUpdate();
			try
			{			
				if (cell.value != null && typeof cell.value == 'object')
				{
					if (this.isReplacePlaceholders(cell) &&
						cell.getAttribute('placeholder') != null)
					{
						// LATER: Handle delete, name change
						var name = cell.getAttribute('placeholder');
						var current = cell;
								
						while (current != null)
						{
							if (current == this.model.getRoot() || (current.value != null &&
								typeof(current.value) == 'object' && current.hasAttribute(name)))
							{
								this.setAttributeForCell(current, name, value);
								
								break;
							}
							
							current = this.model.getParent(current);
						}
					}
					
					var tmp = cell.value.cloneNode(true);
					tmp.setAttribute('label', value);
					value = tmp;
				}

				mxGraph.prototype.cellLabelChanged.apply(this, arguments);
			}
			finally
			{
				this.model.endUpdate();
			}
		};

		/**
		 * Removes transparent empty groups if all children are removed.
		 */
		Graph.prototype.cellsRemoved = function(cells)
		{
			if (cells != null)
			{
				var dict = new mxDictionary();
				
				for (var i = 0; i < cells.length; i++)
				{
					dict.put(cells[i], true);
				}
				
				// LATER: Recurse up the cell hierarchy
				var parents = [];
				
				for (var i = 0; i < cells.length; i++)
				{
					var parent = this.model.getParent(cells[i]);

					if (parent != null && !dict.get(parent))
					{
						dict.put(parent, true);
						parents.push(parent);
					}
				}
				
				for (var i = 0; i < parents.length; i++)
				{
					var state = this.view.getState(parents[i]);
					
					if (state != null && (this.model.isEdge(state.cell) || this.model.isVertex(state.cell)) && this.isCellDeletable(state.cell))
					{
						var stroke = mxUtils.getValue(state.style, mxConstants.STYLE_STROKECOLOR, mxConstants.NONE);
						var fill = mxUtils.getValue(state.style, mxConstants.STYLE_FILLCOLOR, mxConstants.NONE);
						
						if (stroke == mxConstants.NONE && fill == mxConstants.NONE)
						{
							var allChildren = true;
							
							for (var j = 0; j < this.model.getChildCount(state.cell) && allChildren; j++)
							{
								if (!dict.get(this.model.getChildAt(state.cell, j)))
								{
									allChildren = false;
								}
							}
							
							if (allChildren)
							{
								cells.push(state.cell);
							}
						}
					}
				}
			}
			
			mxGraph.prototype.cellsRemoved.apply(this, arguments);
		};
		
		/**
		 * Overrides ungroup to check if group should be removed.
		 */
		Graph.prototype.removeCellsAfterUngroup = function(cells)
		{
			var cellsToRemove = [];
			
			for (var i = 0; i < cells.length; i++)
			{
				if (this.isCellDeletable(cells[i]))
				{
					var state = this.view.getState(cells[i]);
					
					if (state != null)
					{
						var stroke = mxUtils.getValue(state.style, mxConstants.STYLE_STROKECOLOR, mxConstants.NONE);
						var fill = mxUtils.getValue(state.style, mxConstants.STYLE_FILLCOLOR, mxConstants.NONE);
						
						if (stroke == mxConstants.NONE && fill == mxConstants.NONE)
						{
							cellsToRemove.push(cells[i]);
						}
					}
				}
			}
			
			cells = cellsToRemove;
			
			mxGraph.prototype.removeCellsAfterUngroup.apply(this, arguments);
		};
		
		/**
		 * Sets the link for the given cell.
		 */
		Graph.prototype.setLinkForCell = function(cell, link)
		{
			this.setAttributeForCell(cell, 'link', link);
		};
		
		/**
		 * Sets the link for the given cell.
		 */
		Graph.prototype.setTooltipForCell = function(cell, link)
		{
			this.setAttributeForCell(cell, 'tooltip', link);
		};
		
		/**
		 * Sets the link for the given cell.
		 */
		Graph.prototype.setAttributeForCell = function(cell, attributeName, attributeValue)
		{
			var value = null;
			
			if (cell.value != null && typeof(cell.value) == 'object')
			{
				value = cell.value.cloneNode(true);
			}
			else
			{
				var doc = mxUtils.createXmlDocument();
				
				value = doc.createElement('UserObject');
				value.setAttribute('label', cell.value || '');
			}
			
			if (attributeValue != null && attributeValue.length > 0)
			{
				value.setAttribute(attributeName, attributeValue);
			}
			else
			{
				value.removeAttribute(attributeName);
			}
			
			this.model.setValue(cell, value);
		};
		
		/**
		 * Overridden to stop moving edge labels between cells.
		 */
		Graph.prototype.getDropTarget = function(cells, evt, cell, clone)
		{
			var model = this.getModel();
			
			// Disables drop into group if alt is pressed
			if (mxEvent.isAltDown(evt))
			{
				return null;
			}
			
			// Disables dragging edge labels out of edges
			for (var i = 0; i < cells.length; i++)
			{
				if (this.model.isEdge(this.model.getParent(cells[i])))
				{
					return null;
				}
			}
			
			return mxGraph.prototype.getDropTarget.apply(this, arguments);
		};
	
		/**
		 * Overrides double click handling to avoid accidental inserts of new labels in dblClick below.
		 */
		Graph.prototype.click = function(me)
		{
			mxGraph.prototype.click.call(this, me);
			
			// Stores state and source for checking in dblClick
			this.firstClickState = me.getState();
			this.firstClickSource = me.getSource();
		};
		
		/**
		 * Overrides double click handling to add the tolerance and inserting text.
		 */
		Graph.prototype.dblClick = function(evt, cell)
		{
			if (this.isEnabled())
			{
				var pt = mxUtils.convertPoint(this.container, mxEvent.getClientX(evt), mxEvent.getClientY(evt));
		
				// Automatically adds new child cells to edges on double click
				if (evt != null && !this.model.isVertex(cell))
				{
					var state = (this.model.isEdge(cell)) ? this.view.getState(cell) : null;
					var src = mxEvent.getSource(evt);
					
					if (this.firstClickState == state && this.firstClickSource == src)
					{
						if (state == null || (state.text == null || state.text.node == null ||
							(!mxUtils.contains(state.text.boundingBox, pt.x, pt.y) &&
							!mxUtils.isAncestorNode(state.text.node, mxEvent.getSource(evt)))))
						{
							if ((state == null && !this.isCellLocked(this.getDefaultParent())) ||
								(state != null && !this.isCellLocked(state.cell)))
							{
								// Avoids accidental inserts on background
								if (state != null || (mxClient.IS_VML && src == this.view.getCanvas()) ||
									(mxClient.IS_SVG && src == this.view.getCanvas().ownerSVGElement))
								{
									cell = this.addText(pt.x, pt.y, state);
								}
							}
						}
					}
				}
			
				mxGraph.prototype.dblClick.call(this, evt, cell);
			}
		};
		
		/**
		 * Returns a point that specifies the location for inserting cells.
		 */
		Graph.prototype.getInsertPoint = function()
		{
			var gs = this.getGridSize();
			var dx = this.container.scrollLeft / this.view.scale - this.view.translate.x;
			var dy = this.container.scrollTop / this.view.scale - this.view.translate.y;
			
			if (this.pageVisible)
			{
				var layout = this.getPageLayout();
				var page = this.getPageSize();
				dx = Math.max(dx, layout.x * page.width);
				dy = Math.max(dy, layout.y * page.height);
			}
			
			return new mxPoint(this.snap(dx + gs), this.snap(dy + gs));
		};
		
		/**
		 * 
		 */
		Graph.prototype.getFreeInsertPoint = function()
		{
			var view = this.view;
			var bds = this.getGraphBounds();
			var pt = this.getInsertPoint();
			
			// Places at same x-coord and 2 grid sizes below existing graph
			var x = this.snap(Math.round(Math.max(pt.x, bds.x / view.scale - view.translate.x +
				((bds.width == 0) ? this.gridSize : 0))));
			var y = this.snap(Math.round(Math.max(pt.y, (bds.y + bds.height) / view.scale - view.translate.y +
				((bds.height == 0) ? 1 : 2) * this.gridSize)));
			
			return new mxPoint(x, y);
		};
		
		/**
		 * Hook for subclassers to return true if the current insert point was defined
		 * using a mouse hover event.
		 */
		Graph.prototype.isMouseInsertPoint = function()
		{			
			return false;
		};
		
		/**
		 * Adds a new label at the given position and returns the new cell. State is
		 * an optional edge state to be used as the parent for the label. Vertices
		 * are not allowed currently as states.
		 */
		Graph.prototype.addText = function(x, y, state)
		{
			// Creates a new edge label with a predefined text
			var label = new mxCell();
			label.value = 'Text';
			label.style = 'text;html=1;resizable=0;points=[];'
			label.geometry = new mxGeometry(0, 0, 0, 0);
			label.vertex = true;
			
			if (state != null)
			{
				label.style += 'align=center;verticalAlign=middle;labelBackgroundColor=#ffffff;'
				label.geometry.relative = true;
				label.connectable = false;
				
				// Resets the relative location stored inside the geometry
				var pt2 = this.view.getRelativePoint(state, x, y);
				label.geometry.x = Math.round(pt2.x * 10000) / 10000;
				label.geometry.y = Math.round(pt2.y);
				
				// Resets the offset inside the geometry to find the offset from the resulting point
				label.geometry.offset = new mxPoint(0, 0);
				pt2 = this.view.getPoint(state, label.geometry);
			
				var scale = this.view.scale;
				label.geometry.offset = new mxPoint(Math.round((x - pt2.x) / scale), Math.round((y - pt2.y) / scale));
			}
			else
			{
				label.style += 'autosize=1;align=left;verticalAlign=top;spacingTop=-4;'
		
				var tr = this.view.translate;
				label.geometry.width = 40;
				label.geometry.height = 20;
				label.geometry.x = Math.round(x / this.view.scale) - tr.x;
				label.geometry.y = Math.round(y / this.view.scale) - tr.y;
			}
				
			this.getModel().beginUpdate();
			try
			{
				this.addCells([label], (state != null) ? state.cell : null);
				this.fireEvent(new mxEventObject('textInserted', 'cells', [label]));
				// Updates size of text after possible change of style via event
				this.autoSizeCell(label);
			}
			finally
			{
				this.getModel().endUpdate();
			}
			
			return label;
		};

		/**
		 * 
		 */
		Graph.prototype.getAbsoluteUrl = function(url)
		{
			if (url != null && this.isRelativeUrl(url))
			{
				if (url.charAt(0) == '#')
				{
					url = this.baseUrl + url;
				}
				else if (url.charAt(0) == '/')
				{
					url = this.domainUrl + url;
				}
				else
				{
					url = this.domainPathUrl + url;
				}
			}
			
			return url;
		};

		/**
		 * Adds a handler for clicking on shapes with links. This replaces all links in labels.
		 */
		Graph.prototype.addClickHandler = function(highlight, beforeClick, onClick)
		{
			// Replaces links in labels for consistent right-clicks
			var checkLinks = mxUtils.bind(this, function()
			{
				var links = this.container.getElementsByTagName('a');
				
				if (links != null)
				{
					for (var i = 0; i < links.length; i++)
					{
						var href = this.getAbsoluteUrl(links[i].getAttribute('href'));
						
						if (href != null)
						{
							links[i].setAttribute('href', href);
							
							if (beforeClick != null)
			    				{
								mxEvent.addGestureListeners(links[i], null, null, beforeClick);
			    				}
						}
					}
				}
			});
			
			this.model.addListener(mxEvent.CHANGE, checkLinks);
			checkLinks();
			
			var cursor = this.container.style.cursor;
			var tol = this.getTolerance();
			var graph = this;

			var mouseListener =
			{
			    currentState: null,
			    currentLink: null,
			    highlight: (highlight != null && highlight != '' && highlight != mxConstants.NONE) ?
			    	new mxCellHighlight(graph, highlight, 4) : null,
			    startX: 0,
			    startY: 0,
			    scrollLeft: 0,
			    scrollTop: 0,
			    updateCurrentState: function(me)
			    {
			    	var tmp = graph.view.getState(me.getCell());
					
			      	if (tmp != this.currentState)
			      	{
			        	if (this.currentState != null)
			        	{
			          		this.clear();
			        	}
			        
		        		this.currentState = tmp;
			        
			        	if (this.currentState != null)
			        	{
			          		this.activate(this.currentState);
			        	}
			      	}
			    },
			    mouseDown: function(sender, me)
			    {
			    	this.startX = me.getGraphX();
			    	this.startY = me.getGraphY();
				    this.scrollLeft = graph.container.scrollLeft;
				    this.scrollTop = graph.container.scrollTop;
				    
		    		if (this.currentLink == null && graph.container.style.overflow == 'auto')
		    		{
		    			graph.container.style.cursor = 'move';
		    		}
		    		
		    		this.updateCurrentState(me);
			    },
			    mouseMove: function(sender, me)
			    {
			    	if (graph.isMouseDown)
			    	{
			    		if (this.currentLink != null)
			    		{
					    	var dx = Math.abs(this.startX - me.getGraphX());
					    	var dy = Math.abs(this.startY - me.getGraphY());
					    	
					    	if (dx > tol || dy > tol)
					    	{
					    		this.clear();
					    	}
			    		}
			    	}
			    	else
			    	{
				    	// Checks for parent link
				    	var linkNode = me.getSource();
				    	
				    	while (linkNode != null && linkNode.nodeName.toLowerCase() != 'a')
				    	{
				    		linkNode = linkNode.parentNode;
				    	}
				    	
			    		if (linkNode != null)
			    		{
			    			this.clear();
			    		}
			    		else
			    		{
					    	if (this.currentState != null && (me.getState() == this.currentState || me.getState() == null) &&
					    		graph.intersects(this.currentState, me.getGraphX(), me.getGraphY()))
					    	{
				    			return;
					    	}
					    	
					    	this.updateCurrentState(me);
			    		}
			    	}
			    },
			    mouseUp: function(sender, me)
			    {
			    	
			    	var source = me.getSource();
			    	var evt = me.getEvent();
			    	
			    	// Checks for parent link
			    	var linkNode = source;
			    	
			    	while (linkNode != null && linkNode.nodeName.toLowerCase() != 'a')
			    	{
			    		linkNode = linkNode.parentNode;
			    	}
			    	
			    	// Ignores clicks on links and collapse/expand icon
			    	if (linkNode == null &&
			    		(((Math.abs(this.scrollLeft - graph.container.scrollLeft) < tol &&
			        	Math.abs(this.scrollTop - graph.container.scrollTop) < tol) &&
			    		(me.getState() == null || !me.isSource(me.getState().control))) &&
			    		((mxEvent.isLeftMouseButton(evt) &&
					!mxEvent.isPopupTrigger(evt)) ||
			    		mxEvent.isTouchEvent(evt))))
			    	{
				    	if (this.currentLink != null) 
				    	{
				    		var blank = graph.isBlankLink(this.currentLink);
				    		
				    		if ((this.currentLink.substring(0, 5) === 'data:' ||
				    			!blank) && beforeClick != null)
				    		{
			    				beforeClick(evt, this.currentLink);
				    		}
				    		
				    		if (!mxEvent.isConsumed(evt))
				    		{
					    		var target = (blank) ? graph.linkTarget : '_top';
					    		
					    		// Workaround for blocking in same iframe
							if (target == '_self' && window != window.top)
							{
								window.location.href = this.currentLink;
							}
							else
							{
								// Avoids page reload for anchors (workaround for IE but used everywhere)
								if (this.currentLink.substring(0, graph.baseUrl.length) == graph.baseUrl &&
									this.currentLink.charAt(graph.baseUrl.length) == '#' &&
									target == '_top' && window == window.top)
								{
									window.location.hash = this.currentLink.split('#')[1];
								}
								else
								{
									window.open(this.currentLink, target);
								}
							}
					    		
					    		me.consume();
				    		}
				    	}
				    	else if (onClick != null && !me.isConsumed() &&
			    			(Math.abs(this.scrollLeft - graph.container.scrollLeft) < tol &&
			        		Math.abs(this.scrollTop - graph.container.scrollTop) < tol) &&
			        		(Math.abs(this.startX - me.getGraphX()) < tol &&
			        		Math.abs(this.startY - me.getGraphY()) < tol))
			        	{
				    		onClick(me.getEvent());
			    		}
			    	}
			    	
			    	this.clear();
			    },
			    activate: function(state)
			    {
			    	this.currentLink = graph.getAbsoluteUrl(graph.getLinkForCell(state.cell));

			    	if (this.currentLink != null)
			    	{
			    		graph.container.style.cursor = 'pointer';

			    		if (this.highlight != null)
			    		{
			    			this.highlight.highlight(state);
			    		}
				    }
			    },
			    clear: function()
			    {
			    	if (graph.container != null)
			    	{
			    		graph.container.style.cursor = cursor;
			    	}
			    	
			    	this.currentState = null;
			    	this.currentLink = null;
			    	
			    	if (this.highlight != null)
			    	{
			    		this.highlight.hide();
			    	}
			    }
			};

			// Ignores built-in click handling
			graph.click = function(me) {};
			graph.addMouseListener(mouseListener);
			
			mxEvent.addListener(document, 'mouseleave', function(evt)
			{
				mouseListener.clear();
			});
		};
		
		/**
		 * Duplicates the given cells and returns the duplicates.
		 */
		Graph.prototype.duplicateCells = function(cells, append)
		{
			cells = (cells != null) ? cells : this.getSelectionCells();
			append = (append != null) ? append : true;
			
			cells = this.model.getTopmostCells(cells);
			
			var model = this.getModel();
			var s = this.gridSize;
			var select = [];
			
			model.beginUpdate();
			try
			{
				var clones = this.cloneCells(cells, false);
				
				for (var i = 0; i < cells.length; i++)
				{
					var parent = model.getParent(cells[i]);
					var child = this.moveCells([clones[i]], s, s, false, parent)[0]; 
					select.push(child);
					
					if (append)
					{
						model.add(parent, clones[i]);
					}
					else
					{
						// Maintains child index by inserting after cloned in parent
						var index = parent.getIndex(cells[i]);
						model.add(parent, clones[i], index + 1);
					}
				}
			}
			finally
			{
				model.endUpdate();
			}
			
			return select;
		};
		
		/**
		 * Inserts the given image at the cursor in a content editable text box using
		 * the insertimage command on the document instance.
		 */
		Graph.prototype.insertImage = function(newValue, w, h)
		{
			// To find the new image, we create a list of all existing links first
			if (newValue != null)
			{
				var tmp = this.cellEditor.textarea.getElementsByTagName('img');
				var oldImages = [];
				
				for (var i = 0; i < tmp.length; i++)
				{
					oldImages.push(tmp[i]);
				}
				
				// LATER: Fix inserting link/image in IE8/quirks after focus lost
				document.execCommand('insertimage', false, newValue);
				
				// Sets size of new image
				var newImages = this.cellEditor.textarea.getElementsByTagName('img');
				
				if (newImages.length == oldImages.length + 1)
				{
					// Inverse order in favor of appended images
					for (var i = newImages.length - 1; i >= 0; i--)
					{
						if (i == 0 || newImages[i] != oldImages[i - 1])
						{
							// Workaround for lost styles during undo and redo is using attributes
							newImages[i].setAttribute('width', w);
							newImages[i].setAttribute('height', h);
							
							break;
						}
					}
				}
			}
		};
				
		/**
		 * Inserts the given image at the cursor in a content editable text box using
		 * the insertimage command on the document instance.
		 */
		Graph.prototype.insertLink = function(value)
		{
			if (value.length == 0)
			{
				document.execCommand('unlink', false);
			}
			else
			{
				// LATER: Fix inserting link/image in IE8/quirks after focus lost
				document.execCommand('createlink', false, mxUtils.trim(value));
			}
		};
		
		/**
		 * 
		 * @param cell
		 * @returns {Boolean}
		 */
		Graph.prototype.isCellResizable = function(cell)
		{
			var result = mxGraph.prototype.isCellResizable.apply(this, arguments);
		
			var state = this.view.getState(cell);
			var style = (state != null) ? state.style : this.getCellStyle(cell);
				
			return result || (mxUtils.getValue(style, mxConstants.STYLE_RESIZABLE, '1') != '0' &&
				style[mxConstants.STYLE_WHITE_SPACE] == 'wrap');
		};
		
		/**
		 * Function: distributeCells
		 * 
		 * Distribuets the centers of the given cells equally along the available
		 * horizontal or vertical space.
		 * 
		 * Parameters:
		 * 
		 * horizontal - Boolean that specifies the direction of the distribution.
		 * cells - Optional array of <mxCells> to be distributed. Edges are ignored.
		 */
		Graph.prototype.distributeCells = function(horizontal, cells)
		{
			if (cells == null)
			{
				cells = this.getSelectionCells();
			}
			
			if (cells != null && cells.length > 1)
			{
				var vertices = [];
				var max = null;
				var min = null;
				
				for (var i = 0; i < cells.length; i++)
				{
					if (this.getModel().isVertex(cells[i]))
					{
						var state = this.view.getState(cells[i]);
						
						if (state != null)
						{
							var tmp = (horizontal) ? state.getCenterX() : state.getCenterY();
							max = (max != null) ? Math.max(max, tmp) : tmp;
							min = (min != null) ? Math.min(min, tmp) : tmp;
							
							vertices.push(state);
						}
					}
				}
				
				if (vertices.length > 2)
				{
					vertices.sort(function(a, b)
					{
						return (horizontal) ? a.x - b.x : a.y - b.y;
					});
		
					var t = this.view.translate;
					var s = this.view.scale;
					
					min = min / s - ((horizontal) ? t.x : t.y);
					max = max / s - ((horizontal) ? t.x : t.y);
					
					this.getModel().beginUpdate();
					try
					{
						var dt = (max - min) / (vertices.length - 1);
						var t0 = min;
						
						for (var i = 1; i < vertices.length - 1; i++)
						{
							var pstate = this.view.getState(this.model.getParent(vertices[i].cell));
							var geo = this.getCellGeometry(vertices[i].cell);
							t0 += dt;
							
							if (geo != null && pstate != null)
							{
								geo = geo.clone();
								
								if (horizontal)
								{
									geo.x = Math.round(t0 - geo.width / 2) - pstate.origin.x;
								}
								else
								{
									geo.y = Math.round(t0 - geo.height / 2) - pstate.origin.y;
								}
								
								this.getModel().setGeometry(vertices[i].cell, geo);
							}
						}
					}
					finally
					{
						this.getModel().endUpdate();
					}
				}
			}
			
			return cells;
		};
		
		/**
		 * Adds meta-drag an Mac.
		 * @param evt
		 * @returns
		 */
		Graph.prototype.isCloneEvent = function(evt)
		{
			return (mxClient.IS_MAC && mxEvent.isMetaDown(evt)) || mxEvent.isControlDown(evt);
		};
		
		/**
		 * Translates this point by the given vector.
		 * 
		 * @param {number} dx X-coordinate of the translation.
		 * @param {number} dy Y-coordinate of the translation.
		 */
		Graph.prototype.encodeCells = function(cells)
		{
			var clones = this.cloneCells(cells);
			
			// Creates a dictionary for fast lookups
			var dict = new mxDictionary();
			
			for (var i = 0; i < cells.length; i++)
			{
				dict.put(cells[i], true);
			}
			
			// Checks for orphaned relative children and makes absolute
			for (var i = 0; i < clones.length; i++)
			{
				var state = this.view.getState(cells[i]);
				
				if (state != null)
				{
					var geo = this.getCellGeometry(clones[i]);
					
					if (geo != null && geo.relative && !this.model.isEdge(cells[i]) &&
						!dict.get(this.model.getParent(cells[i])))
					{
						geo.relative = false;
						geo.x = state.x / state.view.scale - state.view.translate.x;
						geo.y = state.y / state.view.scale - state.view.translate.y;
					}
				}
			}
			
			var codec = new mxCodec();
			var model = new mxGraphModel();
			var parent = model.getChildAt(model.getRoot(), 0);
			
			for (var i = 0; i < cells.length; i++)
			{
				model.add(parent, clones[i]);
			}

			return codec.encode(model);
		};
		
		/**
		 * Translates this point by the given vector.
		 * 
		 * @param {number} dx X-coordinate of the translation.
		 * @param {number} dy Y-coordinate of the translation.
		 */
		Graph.prototype.createSvgImageExport = function()
		{
			var exp = new mxImageExport();
			
			// Adds hyperlinks (experimental)
			exp.getLinkForCellState = mxUtils.bind(this, function(state, canvas)
			{
				return this.getLinkForCell(state.cell);
			});

			return exp;
		};
		
		/**
		 * Translates this point by the given vector.
		 * 
		 * @param {number} dx X-coordinate of the translation.
		 * @param {number} dy Y-coordinate of the translation.
		 */
		Graph.prototype.getSvg = function(background, scale, border, nocrop, crisp, ignoreSelection, showText)
		{
			scale = (scale != null) ? scale : 1;
			border = (border != null) ? border : 0;
			crisp = (crisp != null) ? crisp : true;
			ignoreSelection = (ignoreSelection != null) ? ignoreSelection : true;
			showText = (showText != null) ? showText : true;

			var bounds = (ignoreSelection || nocrop) ?
					this.getGraphBounds() : this.getBoundingBox(this.getSelectionCells());

			if (bounds == null)
			{
				throw Error(mxResources.get('drawingEmpty'));
			}

			var vs = this.view.scale;
			
			// Prepares SVG document that holds the output
			var svgDoc = mxUtils.createXmlDocument();
			var root = (svgDoc.createElementNS != null) ?
		    		svgDoc.createElementNS(mxConstants.NS_SVG, 'svg') : svgDoc.createElement('svg');
		    
			if (background != null)
			{
				if (root.style != null)
				{
					root.style.backgroundColor = background;
				}
				else
				{
					root.setAttribute('style', 'background-color:' + background);
				}
			}
		    
			if (svgDoc.createElementNS == null)
			{
		    	root.setAttribute('xmlns', mxConstants.NS_SVG);
		    	root.setAttribute('xmlns:xlink', mxConstants.NS_XLINK);
			}
			else
			{
				// KNOWN: Ignored in IE9-11, adds namespace for each image element instead. No workaround.
				root.setAttributeNS('http://www.w3.org/2000/xmlns/', 'xmlns:xlink', mxConstants.NS_XLINK);
			}
			
			var s = scale / vs;
			root.setAttribute('width', Math.max(1, Math.ceil(bounds.width * s) + 2 * border) + 'px');
			root.setAttribute('height', Math.max(1, Math.ceil(bounds.height * s) + 2 * border) + 'px');
			root.setAttribute('version', '1.1');
			
		    // Adds group for anti-aliasing via transform
			var node = root;
			
			if (crisp)
			{
				var group = (svgDoc.createElementNS != null) ?
						svgDoc.createElementNS(mxConstants.NS_SVG, 'g') : svgDoc.createElement('g');
				group.setAttribute('transform', 'translate(0.5,0.5)');
				root.appendChild(group);
				svgDoc.appendChild(root);
				node = group;
			}
			else
			{
				svgDoc.appendChild(root);
			}
		
		    // Renders graph. Offset will be multiplied with state's scale when painting state.
			// TextOffset only seems to affect FF output but used everywhere for consistency.
			var svgCanvas = this.createSvgCanvas(node);
			svgCanvas.foOffset = (crisp) ? -0.5 : 0;
			svgCanvas.textOffset = (crisp) ? -0.5 : 0;
			svgCanvas.imageOffset = (crisp) ? -0.5 : 0;
			svgCanvas.translate(Math.floor((border / scale - bounds.x) / vs), Math.floor((border / scale - bounds.y) / vs));
			
			// Convert HTML entities
			var htmlConverter = document.createElement('textarea');
			
			// Adds simple text fallback for viewers with no support for foreignObjects
			var createAlternateContent = svgCanvas.createAlternateContent;
			svgCanvas.createAlternateContent = function(fo, x, y, w, h, str, align, valign, wrap, format, overflow, clip, rotation)
			{
				var s = this.state;

				// Assumes a max character width of 0.2em
				if (this.foAltText != null && (w == 0 || (s.fontSize != 0 && str.length < (w * 5) / s.fontSize)))
				{
					var alt = this.createElement('text');
					alt.setAttribute('x', Math.round(w / 2));
					alt.setAttribute('y', Math.round((h + s.fontSize) / 2));
					alt.setAttribute('fill', s.fontColor || 'black');
					alt.setAttribute('text-anchor', 'middle');
					alt.setAttribute('font-size', Math.round(s.fontSize) + 'px');
					alt.setAttribute('font-family', s.fontFamily);
					
					if ((s.fontStyle & mxConstants.FONT_BOLD) == mxConstants.FONT_BOLD)
					{
						alt.setAttribute('font-weight', 'bold');
					}
					
					if ((s.fontStyle & mxConstants.FONT_ITALIC) == mxConstants.FONT_ITALIC)
					{
						alt.setAttribute('font-style', 'italic');
					}
					
					if ((s.fontStyle & mxConstants.FONT_UNDERLINE) == mxConstants.FONT_UNDERLINE)
					{
						alt.setAttribute('text-decoration', 'underline');
					}
					
					try
					{
						htmlConverter.innerHTML = str;
						alt.textContent = htmlConverter.value;
						
						return alt;
					}
					catch (e)
					{
						return createAlternateContent.apply(this, arguments);
					}
				}
				else
				{
					return createAlternateContent.apply(this, arguments);
				}
			};
			
			// Paints background image
			var bgImg = this.backgroundImage;
			
			if (bgImg != null)
			{
				var s2 = vs / scale;
				var tr = this.view.translate;
				var tmp = new mxRectangle(tr.x * s2, tr.y * s2, bgImg.width * s2, bgImg.height * s2);
				
				// Checks if visible
				if (mxUtils.intersects(bounds, tmp))
				{
					svgCanvas.image(tr.x, tr.y, bgImg.width, bgImg.height, bgImg.src, true);
				}
			}
			
			svgCanvas.scale(s);
			svgCanvas.textEnabled = showText;
			
			var imgExport = this.createSvgImageExport();
			var imgExportDrawCellState = imgExport.drawCellState;
			
			// Implements ignoreSelection flag
			imgExport.drawCellState = function(state, canvas)
			{
				if (ignoreSelection || state.view.graph.isCellSelected(state.cell))
				{
					imgExportDrawCellState.apply(this, arguments);
				}
			};

			imgExport.drawState(this.getView().getState(this.model.root), svgCanvas);
		
			return root;
		};
		
		/**
		 * Hook for creating the canvas used in getSvg.
		 */
		Graph.prototype.createSvgCanvas = function(node)
		{
			return new mxSvgCanvas2D(node);
		};
		
		/**
		 * Returns the first ancestor of the current selection with the given name.
		 */
		Graph.prototype.getSelectedElement = function()
		{
			var node = null;
			
			if (window.getSelection)
			{
				var sel = window.getSelection();
				
			    if (sel.getRangeAt && sel.rangeCount)
			    {
			        var range = sel.getRangeAt(0);
			        node = range.commonAncestorContainer;
			    }
			}
			else if (document.selection)
			{
				node = document.selection.createRange().parentElement();
			}
			
			return node;
		};
		
		/**
		 * Returns the first ancestor of the current selection with the given name.
		 */
		Graph.prototype.getParentByName = function(node, name, stopAt)
		{
			while (node != null)
			{
				if (node.nodeName == name)
				{
					return node;
				}
		
				if (node == stopAt)
				{
					return null;
				}
				
				node = node.parentNode;
			}
			
			return node;
		};
		
		/**
		 * Selects the given node.
		 */
		Graph.prototype.selectNode = function(node)
		{
			var sel = null;
			
		    // IE9 and non-IE
			if (window.getSelection)
		    {
		    	sel = window.getSelection();
		    	
		        if (sel.getRangeAt && sel.rangeCount)
		        {
		        	var range = document.createRange();
		            range.selectNode(node);
		            sel.removeAllRanges();
		            sel.addRange(range);
		        }
		    }
		    // IE < 9
			else if ((sel = document.selection) && sel.type != 'Control')
		    {
		        var originalRange = sel.createRange();
		        originalRange.collapse(true);
		        var range = sel.createRange();
		        range.setEndPoint('StartToStart', originalRange);
		        range.select();
		    }
		};
		
		/**
		 * Inserts a new row into the given table.
		 */
		Graph.prototype.insertRow = function(table, index)
		{
			var bd = table.tBodies[0];
			var cols = (bd.rows.length > 0) ? bd.rows[0].cells.length : 1;
			var row = bd.insertRow(index);
			
			for (var i = 0; i < cols; i++)
			{
				mxUtils.br(row.insertCell(-1));
			}
			
			return row.cells[0];
		};
		
		/**
		 * Deletes the given column.
		 */
		Graph.prototype.deleteRow = function(table, index)
		{
			table.tBodies[0].deleteRow(index);
		};
		
		/**
		 * Deletes the given column.
		 */
		Graph.prototype.insertColumn = function(table, index)
		{
			var hd = table.tHead;
			
			if (hd != null)
			{
				// TODO: use colIndex
				for (var h = 0; h < hd.rows.length; h++)
				{
					var th = document.createElement('th');
					hd.rows[h].appendChild(th);
					mxUtils.br(th);
				}
			}
		
			var bd = table.tBodies[0];
			
			for (var i = 0; i < bd.rows.length; i++)
			{
				var cell = bd.rows[i].insertCell(index);
				mxUtils.br(cell);
			}
			
			return bd.rows[0].cells[(index >= 0) ? index : bd.rows[0].cells.length - 1];
		};
		
		/**
		 * Deletes the given column.
		 */
		Graph.prototype.deleteColumn = function(table, index)
		{
			if (index >= 0)
			{
				var bd = table.tBodies[0];
				var rows = bd.rows;
				
				for (var i = 0; i < rows.length; i++)
				{
					if (rows[i].cells.length > index)
					{
						rows[i].deleteCell(index);
					}
				}
			}
		};
		
		/**
		 * Inserts the given HTML at the caret position (no undo).
		 */
		Graph.prototype.pasteHtmlAtCaret = function(html)
		{
		    var sel, range;
		
			// IE9 and non-IE
		    if (window.getSelection)
		    {
		        sel = window.getSelection();
		        
		        if (sel.getRangeAt && sel.rangeCount)
		        {
		            range = sel.getRangeAt(0);
		            range.deleteContents();
		
		            // Range.createContextualFragment() would be useful here but is
		            // only relatively recently standardized and is not supported in
		            // some browsers (IE9, for one)
		            var el = document.createElement("div");
		            el.innerHTML = html;
		            var frag = document.createDocumentFragment(), node;
		            
		            while ((node = el.firstChild))
		            {
		                lastNode = frag.appendChild(node);
		            }
		            
		            range.insertNode(frag);
		        }
		    }
		    // IE < 9
		    else if ((sel = document.selection) && sel.type != "Control")
		    {
		    	// FIXME: Does not work if selection is empty
		        sel.createRange().pasteHTML(html);
		    }
		};
	
		/**
		 * Creates an anchor elements for handling the given link in the
		 * hint that is shown when the cell is selected.
		 */
		Graph.prototype.createLinkForHint = function(link, label)
		{
			label = (label != null) ? label : link;
			
			var a = document.createElement('a');
			a.setAttribute('href', this.getAbsoluteUrl(link));
			a.setAttribute('title', link);
			
			if (this.linkTarget != null)
			{
				a.setAttribute('target', this.linkTarget);
			}
			
			// Adds shortened label to link
			var max = 40;
			var head = 26;
			var tail = 10;
			
			if (label.length > max)
			{
				label = label.substring(0, head) + '...' + label.substring(label.length - tail);
			}

			mxUtils.write(a, label);
			
			return a;
		};
		
		/**
		 * Customized graph for touch devices.
		 */
		Graph.prototype.initTouch = function()
		{
			// Disables new connections via "hotspot"
			this.connectionHandler.marker.isEnabled = function()
			{
				return this.graph.connectionHandler.first != null;
			};
		
			// Hides menu when editing starts
			this.addListener(mxEvent.START_EDITING, function(sender, evt)
			{
				this.popupMenuHandler.hideMenu();
			});
		
			// Adds custom hit detection if native hit detection found no cell
			var graphUpdateMouseEvent = this.updateMouseEvent;
			this.updateMouseEvent = function(me)
			{
				me = graphUpdateMouseEvent.apply(this, arguments);
	
				if (mxEvent.isTouchEvent(me.getEvent()) && me.getState() == null)
				{
					var cell = this.getCellAt(me.graphX, me.graphY);
		
					if (cell != null && this.isSwimlane(cell) && this.hitsSwimlaneContent(cell, me.graphX, me.graphY))
					{
						cell = null;
					}
					else
					{
						me.state = this.view.getState(cell);
						
						if (me.state != null && me.state.shape != null)
						{
							this.container.style.cursor = me.state.shape.node.style.cursor;
						}
					}
				}
				
				if (me.getState() == null && this.isEnabled())
				{
					this.container.style.cursor = 'default';
				}
				
				return me;
			};
		
			// Context menu trigger implementation depending on current selection state
			// combined with support for normal popup trigger.
			var cellSelected = false;
			var selectionEmpty = false;
			var menuShowing = false;
			
			var oldFireMouseEvent = this.fireMouseEvent;
			
			this.fireMouseEvent = function(evtName, me, sender)
			{
				if (evtName == mxEvent.MOUSE_DOWN)
				{
					// For hit detection on edges
					me = this.updateMouseEvent(me);
					
					cellSelected = this.isCellSelected(me.getCell());
					selectionEmpty = this.isSelectionEmpty();
					menuShowing = this.popupMenuHandler.isMenuShowing();
				}
				
				oldFireMouseEvent.apply(this, arguments);
			};
			
			// Shows popup menu if cell was selected or selection was empty and background was clicked
			// FIXME: Conflicts with mxPopupMenuHandler.prototype.getCellForPopupEvent in Editor.js by
			// selecting parent for selected children in groups before this check can be made.
			this.popupMenuHandler.mouseUp = mxUtils.bind(this, function(sender, me)
			{
				this.popupMenuHandler.popupTrigger = !this.isEditing() && this.isEnabled() &&
					(me.getState() == null || !me.isSource(me.getState().control)) &&
					(this.popupMenuHandler.popupTrigger || (!menuShowing && !mxEvent.isMouseEvent(me.getEvent()) &&
					((selectionEmpty && me.getCell() == null && this.isSelectionEmpty()) ||
					(cellSelected && this.isCellSelected(me.getCell())))));
				mxPopupMenuHandler.prototype.mouseUp.apply(this.popupMenuHandler, arguments);
			});
		};
		
		/**
		 * HTML in-place editor
		 */
		mxCellEditor.prototype.isContentEditing = function()
		{
			var state = this.graph.view.getState(this.editingCell);
			
			return state != null && state.style['html'] == 1;
		};
	
		/**
		 * Creates the keyboard event handler for the current graph and history.
		 */
		mxCellEditor.prototype.saveSelection = function()
		{
		    if (window.getSelection)
		    {
		        var sel = window.getSelection();
		        
		        if (sel.getRangeAt && sel.rangeCount)
		        {
		            var ranges = [];
		            
		            for (var i = 0, len = sel.rangeCount; i < len; ++i)
		            {
		                ranges.push(sel.getRangeAt(i));
		            }
		            
		            return ranges;
		        }
		    }
		    else if (document.selection && document.selection.createRange)
		    {
		        return document.selection.createRange();
		    }
		    
		    return null;
		};
	
		/**
		 * Creates the keyboard event handler for the current graph and history.
		 */
		mxCellEditor.prototype.restoreSelection = function(savedSel)
		{
			try
			{
				if (savedSel)
				{
					if (window.getSelection)
					{
						sel = window.getSelection();
						sel.removeAllRanges();
		
						for (var i = 0, len = savedSel.length; i < len; ++i)
						{
							sel.addRange(savedSel[i]);
						}
					}
					else if (document.selection && savedSel.select)
					{
						savedSel.select();
					}
				}
			}
			catch (e)
			{
				// ignore
			}
		};
	
		/**
		 * Handling of special nl2Br style for not converting newlines to breaks in HTML labels.
		 * NOTE: Since it's easier to set this when the label is created we assume that it does
		 * not change during the lifetime of the mxText instance.
		 */
		var mxCellRendererInitializeLabel = mxCellRenderer.prototype.initializeLabel;
		mxCellRenderer.prototype.initializeLabel = function(state)
		{
			if (state.text != null)
			{
				state.text.replaceLinefeeds = mxUtils.getValue(state.style, 'nl2Br', '1') != '0';
			}
			
			mxCellRendererInitializeLabel.apply(this, arguments);
		};
	
		var mxConstraintHandlerUpdate = mxConstraintHandler.prototype.update;
		mxConstraintHandler.prototype.update = function(me, source)
		{
			if (this.isKeepFocusEvent(me) || !mxEvent.isAltDown(me.getEvent()))
			{
				mxConstraintHandlerUpdate.apply(this, arguments);
			}
			else
			{
				this.reset();
			}
		};
	
		/**
		 * No dashed shapes.
		 */
		mxGuide.prototype.createGuideShape = function(horizontal)
		{
			var guide = new mxPolyline([], mxConstants.GUIDE_COLOR, mxConstants.GUIDE_STROKEWIDTH);
			
			return guide;
		};
	
		/**
		 * HTML in-place editor
		 */
		mxCellEditor.prototype.escapeCancelsEditing = false;
		
		var mxCellEditorStartEditing = mxCellEditor.prototype.startEditing;
		mxCellEditor.prototype.startEditing = function(cell, trigger)
		{
			mxCellEditorStartEditing.apply(this, arguments);
			
			// Overrides class in case of HTML content to add
			// dashed borders for divs and table cells
			var state = this.graph.view.getState(cell);
	
			if (state != null && state.style['html'] == 1)
			{
				this.textarea.className = 'mxCellEditor geContentEditable';
			}
			else
			{
				this.textarea.className = 'mxCellEditor mxPlainTextEditor';
			}
			
			// Toggles markup vs wysiwyg mode
			this.codeViewMode = false;
			
			// Stores current selection range when switching between markup and code
			this.switchSelectionState = null;
			
			// Selects editing cell
			this.graph.setSelectionCell(cell);

			// Enables focus outline for edges and edge labels
			var parent = this.graph.getModel().getParent(cell);
			var geo = this.graph.getCellGeometry(cell);
			
			if ((this.graph.getModel().isEdge(parent) && geo != null && geo.relative) ||
				this.graph.getModel().isEdge(cell))
			{
				// Quirks does not support outline at all so use border instead
				if (mxClient.IS_QUIRKS)
				{
					this.textarea.style.border = 'gray dotted 1px';
				}
				// IE>8 and FF on Windows uses outline default of none
				else if (mxClient.IS_IE || mxClient.IS_IE11 || (mxClient.IS_FF && mxClient.IS_WIN))
				{
					this.textarea.style.outline = 'gray dotted 1px';
				}
				else
				{
					this.textarea.style.outline = '';
				}
			}
			else if (mxClient.IS_QUIRKS)
			{
				this.textarea.style.outline = 'none';
				this.textarea.style.border = '';
			}
		}

		/**
		 * HTML in-place editor
		 */
		var cellEditorInstallListeners = mxCellEditor.prototype.installListeners;
		mxCellEditor.prototype.installListeners = function(elt)
		{
			cellEditorInstallListeners.apply(this, arguments);

			// Adds a reference from the clone to the original node, recursively
			function reference(node, clone)
			{
				clone.originalNode = node;
				
				node = node.firstChild;
				var child = clone.firstChild;
				
				while (node != null && child != null)
				{
					reference(node, child);
					node = node.nextSibling;
					child = child.nextSibling;
				}
				
				return clone;
			};
			
			// Checks the given node for new nodes, recursively
			function checkNode(node, clone)
			{
				if (node != null)
				{
					if (clone.originalNode != node)
					{
						cleanNode(node);
					}
					else
					{
						node = node.firstChild;
						clone = clone.firstChild;
						
						while (node != null)
						{
							var nextNode = node.nextSibling;
							
							if (clone == null)
							{
								cleanNode(node);
							}
							else
							{
								checkNode(node, clone);
								clone = clone.nextSibling;
							}
	
							node = nextNode;
						}
					}
				}
			};

			// Removes unused DOM nodes and attributes, recursively
			function cleanNode(node)
			{
				var child = node.firstChild;
				
				while (child != null)
				{
					var next = child.nextSibling;
					cleanNode(child);
					child = next;
				}
				
				if ((node.nodeType != 1 || (node.nodeName !== 'BR' && node.firstChild == null)) &&
					(node.nodeType != 3 || mxUtils.trim(mxUtils.getTextContent(node)).length == 0))
				{
					node.parentNode.removeChild(node);
				}
				else
				{
					// Removes linefeeds
					if (node.nodeType == 3)
					{
						mxUtils.setTextContent(node, mxUtils.getTextContent(node).replace(/\n|\r/g, ''));
					}

					// Removes CSS classes and styles (for Word and Excel)
					if (node.nodeType == 1)
					{
						node.removeAttribute('style');
						node.removeAttribute('class');
						node.removeAttribute('width');
						node.removeAttribute('cellpadding');
						node.removeAttribute('cellspacing');
						node.removeAttribute('border');
					}
				}
			};
			
			// Handles paste from Word, Excel etc by removing styles, classnames and unused nodes
			// LATER: Fix undo/redo for paste
			if (!mxClient.IS_QUIRKS && document.documentMode !== 7 && document.documentMode !== 8)
			{
				mxEvent.addListener(this.textarea, 'paste', mxUtils.bind(this, function(evt)
				{
					var clone = reference(this.textarea, this.textarea.cloneNode(true));
	
					window.setTimeout(mxUtils.bind(this, function()
					{
						checkNode(this.textarea, clone);
					}), 0);
				}));
			}
		};
		
		mxCellEditor.prototype.toggleViewMode = function()
		{
			var state = this.graph.view.getState(this.editingCell);
			var nl2Br = state != null && mxUtils.getValue(state.style, 'nl2Br', '1') != '0';
			var tmp = this.saveSelection();
			
			if (!this.codeViewMode)
			{
				// Clears the initial empty label on the first keystroke
				if (this.clearOnChange && this.textarea.innerHTML == this.getEmptyLabelText())
				{
					this.clearOnChange = false;
					this.textarea.innerHTML = '';
				}
				
				// Removes newlines from HTML and converts breaks to newlines
				// to match the HTML output in plain text
				var content = mxUtils.htmlEntities(this.textarea.innerHTML);
	
			    // Workaround for trailing line breaks being ignored in the editor
				if (!mxClient.IS_QUIRKS && document.documentMode != 8)
				{
					content = mxUtils.replaceTrailingNewlines(content, '<div><br></div>');
				}
				
			    content = this.graph.sanitizeHtml((nl2Br) ? content.replace(/\n/g, '').replace(/&lt;br\s*.?&gt;/g, '<br>') : content, true);
				this.textarea.className = 'mxCellEditor mxPlainTextEditor';
				
				var size = mxConstants.DEFAULT_FONTSIZE;
				
				this.textarea.style.lineHeight = (mxConstants.ABSOLUTE_LINE_HEIGHT) ? Math.round(size * mxConstants.LINE_HEIGHT) + 'px' : mxConstants.LINE_HEIGHT;
				this.textarea.style.fontSize = Math.round(size) + 'px';
				this.textarea.style.textDecoration = '';
				this.textarea.style.fontWeight = 'normal';
				this.textarea.style.fontStyle = '';
				this.textarea.style.fontFamily = mxConstants.DEFAULT_FONTFAMILY;
				this.textarea.style.textAlign = 'left';
				
				// Adds padding to make cursor visible with borders
				this.textarea.style.padding = '2px';
				
				if (this.textarea.innerHTML != content)
				{
					this.textarea.innerHTML = content;
				}
	
				this.codeViewMode = true;
			}
			else
			{
				var content = mxUtils.extractTextWithWhitespace(this.textarea.childNodes);
			    
				// Strips trailing line break
			    if (content.length > 0 && content.charAt(content.length - 1) == '\n')
			    {
			    	content = content.substring(0, content.length - 1);
			    }
			    
				content = this.graph.sanitizeHtml((nl2Br) ? content.replace(/\n/g, '<br/>') : content, true)
				this.textarea.className = 'mxCellEditor geContentEditable';
				
				var size = mxUtils.getValue(state.style, mxConstants.STYLE_FONTSIZE, mxConstants.DEFAULT_FONTSIZE);
				var family = mxUtils.getValue(state.style, mxConstants.STYLE_FONTFAMILY, mxConstants.DEFAULT_FONTFAMILY);
				var align = mxUtils.getValue(state.style, mxConstants.STYLE_ALIGN, mxConstants.ALIGN_LEFT);
				var bold = (mxUtils.getValue(state.style, mxConstants.STYLE_FONTSTYLE, 0) &
						mxConstants.FONT_BOLD) == mxConstants.FONT_BOLD;
				var italic = (mxUtils.getValue(state.style, mxConstants.STYLE_FONTSTYLE, 0) &
						mxConstants.FONT_ITALIC) == mxConstants.FONT_ITALIC;
				var uline = (mxUtils.getValue(state.style, mxConstants.STYLE_FONTSTYLE, 0) &
						mxConstants.FONT_UNDERLINE) == mxConstants.FONT_UNDERLINE;
				
				this.textarea.style.lineHeight = (mxConstants.ABSOLUTE_LINE_HEIGHT) ? Math.round(size * mxConstants.LINE_HEIGHT) + 'px' : mxConstants.LINE_HEIGHT;
				this.textarea.style.fontSize = Math.round(size) + 'px';
				this.textarea.style.textDecoration = (uline) ? 'underline' : '';
				this.textarea.style.fontWeight = (bold) ? 'bold' : 'normal';
				this.textarea.style.fontStyle = (italic) ? 'italic' : '';
				this.textarea.style.fontFamily = family;
				this.textarea.style.textAlign = align;
				this.textarea.style.padding = '0px';
				
				if (this.textarea.innerHTML != content)
				{
					this.textarea.innerHTML = content;
					
					if (this.textarea.innerHTML.length == 0)
					{
						this.textarea.innerHTML = this.getEmptyLabelText();
						this.clearOnChange = this.textarea.innerHTML.length > 0;
					}
				}
	
				this.codeViewMode = false;
			}
			
			this.textarea.focus();
		
			if (this.switchSelectionState != null)
			{
				this.restoreSelection(this.switchSelectionState);
			}
			
			this.switchSelectionState = tmp;
			this.resize();
		};
		
		var mxCellEditorResize = mxCellEditor.prototype.resize;
		mxCellEditor.prototype.resize = function(state, trigger)
		{
			if (this.textarea != null)
			{
				var state = this.graph.getView().getState(this.editingCell);
				
				if (this.codeViewMode && state != null)
				{
					var scale = state.view.scale;
					this.bounds = mxRectangle.fromRectangle(state);
					
					// General placement of code editor if cell has no size
					// LATER: Fix HTML editor bounds for edge labels
					if (this.bounds.width == 0 && this.bounds.height == 0)
					{
						this.bounds.width = 160 * scale;
						this.bounds.height = 60 * scale;
						
						var m = (state.text != null) ? state.text.margin : null;
						
						if (m == null)
						{
							m = mxUtils.getAlignmentAsPoint(mxUtils.getValue(state.style, mxConstants.STYLE_ALIGN, mxConstants.ALIGN_CENTER),
									mxUtils.getValue(state.style, mxConstants.STYLE_VERTICAL_ALIGN, mxConstants.ALIGN_MIDDLE));
						}
						
						this.bounds.x += m.x * this.bounds.width;
						this.bounds.y += m.y * this.bounds.height;
					}
		
					this.textarea.style.width = Math.round((this.bounds.width - 4) / scale) + 'px';
					this.textarea.style.height = Math.round((this.bounds.height - 4) / scale) + 'px';
					this.textarea.style.overflow = 'auto';
		
					// Adds scrollbar offset if visible
					if (this.textarea.clientHeight < this.textarea.offsetHeight)
					{
						this.textarea.style.height = Math.round((this.bounds.height / scale)) + (this.textarea.offsetHeight - this.textarea.clientHeight) + 'px';
						this.bounds.height = parseInt(this.textarea.style.height) * scale;
					}
					
					if (this.textarea.clientWidth < this.textarea.offsetWidth)
					{
						this.textarea.style.width = Math.round((this.bounds.width / scale)) + (this.textarea.offsetWidth - this.textarea.clientWidth) + 'px';
						this.bounds.width = parseInt(this.textarea.style.width) * scale;
					}
									
					this.textarea.style.left = Math.round(this.bounds.x) + 'px';
					this.textarea.style.top = Math.round(this.bounds.y) + 'px';
		
					if (mxClient.IS_VML)
					{
						this.textarea.style.zoom = scale;
					}
					else
					{
						mxUtils.setPrefixedStyle(this.textarea.style, 'transform', 'scale(' + scale + ',' + scale + ')');	
					}
				}
				else
				{
					this.textarea.style.height = '';
					this.textarea.style.overflow = '';
					mxCellEditorResize.apply(this, arguments);
				}
			}
		};
		
		mxCellEditorGetInitialValue = mxCellEditor.prototype.getInitialValue;
		mxCellEditor.prototype.getInitialValue = function(state, trigger)
		{
			if (mxUtils.getValue(state.style, 'html', '0') == '0')
			{
				return mxCellEditorGetInitialValue.apply(this, arguments);
			}
			else
			{
				var result = this.graph.getEditingValue(state.cell, trigger)
			
				if (mxUtils.getValue(state.style, 'nl2Br', '1') == '1')
				{
					result = result.replace(/\n/g, '<br/>');
				}
				
				result = this.graph.sanitizeHtml(result, true);
				
				return result;
			}
		};
		
		mxCellEditorGetCurrentValue = mxCellEditor.prototype.getCurrentValue;
		mxCellEditor.prototype.getCurrentValue = function(state)
		{
			if (mxUtils.getValue(state.style, 'html', '0') == '0')
			{
				return mxCellEditorGetCurrentValue.apply(this, arguments);
			}
			else
			{
				var result = this.graph.sanitizeHtml(this.textarea.innerHTML, true);
	
				if (mxUtils.getValue(state.style, 'nl2Br', '1') == '1')
				{
					result = result.replace(/\r\n/g, '<br/>').replace(/\n/g, '<br/>');
				}
				else
				{
					result = result.replace(/\r\n/g, '').replace(/\n/g, '');
				}
				
				return result;
			}
		};
	
		var mxCellEditorStopEditing = mxCellEditor.prototype.stopEditing;
		mxCellEditor.prototype.stopEditing = function(cancel)
		{
			// Restores default view mode before applying value
			if (this.codeViewMode)
			{
				this.toggleViewMode();
			}
			
			mxCellEditorStopEditing.apply(this, arguments);
			
			// Tries to move focus back to container after editing if possible
			this.focusContainer();
		};
		
		mxCellEditor.prototype.focusContainer = function()
		{
			try
			{
				this.graph.container.focus();
			}
			catch (e)
			{
				// ignore
			}
		};
	
		var mxCellEditorApplyValue = mxCellEditor.prototype.applyValue;
		mxCellEditor.prototype.applyValue = function(state, value)
		{
			// Removes empty relative child labels in edges
			this.graph.getModel().beginUpdate();
			
			try
			{
				mxCellEditorApplyValue.apply(this, arguments);
				
				if (this.graph.isCellDeletable(state.cell) && this.graph.model.getChildCount(state.cell) == 0)
				{
					var stroke = mxUtils.getValue(state.style, mxConstants.STYLE_STROKECOLOR, mxConstants.NONE);
					var fill = mxUtils.getValue(state.style, mxConstants.STYLE_FILLCOLOR, mxConstants.NONE);
					
					if (value == '' && stroke == mxConstants.NONE && fill == mxConstants.NONE)
					{
						this.graph.removeCells([state.cell], false);
					}
				}
			}
			finally
			{
				this.graph.getModel().endUpdate();
			}
		};

		/**
		 * Returns the background color to be used for the editing box. This returns
		 * the label background for edge labels and null for all other cases.
		 */
		mxCellEditor.prototype.getBackgroundColor = function(state)
		{
			var color = null;
			
			if (this.graph.getModel().isEdge(state.cell) || this.graph.getModel().isEdge(this.graph.getModel().getParent(state.cell)))
			{
				var color = mxUtils.getValue(state.style, mxConstants.STYLE_LABEL_BACKGROUNDCOLOR, null);
				
				if (color == mxConstants.NONE)
				{
					color = null;
				}
			}
			
			return color;
		};
		
		mxCellEditor.prototype.getMinimumSize = function(state)
		{
			var scale = this.graph.getView().scale;
			
			return new mxRectangle(0, 0, (state.text == null) ? 30 :  state.text.size * scale + 20, 30);
		};
		
		// Hold alt to ignore drop target
		var mxGraphHandlerMoveCells = mxGraphHandler.prototype.moveCells;
		
		mxGraphHandler.prototype.moveCells = function(cells, dx, dy, clone, target, evt)
		{
			if (mxEvent.isAltDown(evt))
			{
				target = null;
			}
			
			mxGraphHandlerMoveCells.apply(this, arguments);
		};
		
		/**
		 * Hints on handlers
		 */
		function createHint()
		{
			var hint = document.createElement('div');
			hint.className = 'geHint';
			hint.style.whiteSpace = 'nowrap';
			hint.style.position = 'absolute';
			
			return hint;
		};
		
		/**
		 * Updates the hint for the current operation.
		 */
		mxGraphHandler.prototype.updateHint = function(me)
		{
			if (this.shape != null)
			{
				if (this.hint == null)
				{
					this.hint = createHint();
					this.graph.container.appendChild(this.hint);
				}
	
				var t = this.graph.view.translate;
				var s = this.graph.view.scale;
				var x = this.roundLength((this.bounds.x + this.currentDx) / s - t.x);
				var y = this.roundLength((this.bounds.y + this.currentDy) / s - t.y);
				
				this.hint.innerHTML = x + ', ' + y;
	
				this.hint.style.left = (this.shape.bounds.x + Math.round((this.shape.bounds.width - this.hint.clientWidth) / 2)) + 'px';
				this.hint.style.top = (this.shape.bounds.y + this.shape.bounds.height + 12) + 'px';
			}
		};
	
		/**
		 * Updates the hint for the current operation.
		 */
		mxGraphHandler.prototype.removeHint = function()
		{
			if (this.hint != null)
			{
				this.hint.parentNode.removeChild(this.hint);
				this.hint = null;
			}
		};
	
		/**
		 * Enables recursive resize for groups.
		 */
		mxVertexHandler.prototype.isRecursiveResize = function(state, me)
		{
			return !this.graph.isSwimlane(state.cell) && this.graph.model.getChildCount(state.cell) > 0 &&
				!mxEvent.isControlDown(me.getEvent()) && !this.graph.isCellCollapsed(state.cell) &&
				mxUtils.getValue(state.style, 'recursiveResize', '1') == '1' &&
				mxUtils.getValue(state.style, 'childLayout', null) == null;
		};
		
		/**
		 * Enables centered resize events.
		 */
		mxVertexHandler.prototype.isCenteredEvent = function(state, me)
		{
			return (!(!this.graph.isSwimlane(state.cell) && this.graph.model.getChildCount(state.cell) > 0 &&
					!this.graph.isCellCollapsed(state.cell) &&
					mxUtils.getValue(state.style, 'recursiveResize', '1') == '1' &&
					mxUtils.getValue(state.style, 'childLayout', null) == null) &&
					mxEvent.isControlDown(me.getEvent())) ||
				mxEvent.isMetaDown(me.getEvent());
		};
		
		var vertexHandlerGetHandlePadding = mxVertexHandler.prototype.getHandlePadding;
		mxVertexHandler.prototype.getHandlePadding = function()
		{
			var result = new mxPoint(0, 0);
			var tol = this.tolerance;
			
			if (this.graph.cellEditor.getEditingCell() == this.state.cell && 
				this.sizers != null && this.sizers.length > 0 && this.sizers[0] != null)
			{
				tol /= 2;
				
				result.x = this.sizers[0].bounds.width + tol;
				result.y = this.sizers[0].bounds.height + tol;
			}
			else
			{
				result = vertexHandlerGetHandlePadding.apply(this, arguments);
			}
			
			return result;
		};
	
		/**
		 * Updates the hint for the current operation.
		 */
		mxVertexHandler.prototype.updateHint = function(me)
		{
			if (this.index != mxEvent.LABEL_HANDLE)
			{
				if (this.hint == null)
				{
					this.hint = createHint();
					this.state.view.graph.container.appendChild(this.hint);
				}
	
				if (this.index == mxEvent.ROTATION_HANDLE)
				{
					this.hint.innerHTML = this.currentAlpha + '&deg;';
				}
				else
				{
					var s = this.state.view.scale;
					this.hint.innerHTML = this.roundLength(this.bounds.width / s) + ' x ' + this.roundLength(this.bounds.height / s);
				}
				
				var rot = (this.currentAlpha != null) ? this.currentAlpha : this.state.style[mxConstants.STYLE_ROTATION] || '0';
				var bb = mxUtils.getBoundingBox(this.bounds, rot);
				
				if (bb == null)
				{
					bb = this.bounds;
				}
				
				this.hint.style.left = bb.x + Math.round((bb.width - this.hint.clientWidth) / 2) + 'px';
				this.hint.style.top = (bb.y + bb.height + 12) + 'px';
				
				if (this.linkHint != null)
				{
					this.linkHint.style.display = 'none';
				}
			}
		};
	
		/**
		 * Updates the hint for the current operation.
		 */
		mxVertexHandler.prototype.removeHint = function()
		{
			mxGraphHandler.prototype.removeHint.apply(this, arguments);
			
			if (this.linkHint != null)
			{
				this.linkHint.style.display = '';
			}
		};
	
		/**
		 * Updates the hint for the current operation.
		 */
		mxEdgeHandler.prototype.updateHint = function(me, point)
		{
			if (this.hint == null)
			{
				this.hint = createHint();
				this.state.view.graph.container.appendChild(this.hint);
			}
	
			var t = this.graph.view.translate;
			var s = this.graph.view.scale;
			var x = this.roundLength(point.x / s - t.x);
			var y = this.roundLength(point.y / s - t.y);
			
			this.hint.innerHTML = x + ', ' + y;
			this.hint.style.visibility = 'visible';
			
			if (this.isSource || this.isTarget)
			{
				if (this.constraintHandler.currentConstraint != null &&
					this.constraintHandler.currentFocus != null)
				{
					var pt = this.constraintHandler.currentConstraint.point;
					this.hint.innerHTML = '[' + Math.round(pt.x * 100) + '%, '+ Math.round(pt.y * 100) + '%]';
				}
				else if (this.marker.hasValidState())
				{
					this.hint.style.visibility = 'hidden';
				}
			}
			
			this.hint.style.left = Math.round(me.getGraphX() - this.hint.clientWidth / 2) + 'px';
			this.hint.style.top = (Math.max(me.getGraphY(), point.y) + this.state.view.graph.gridSize) + 'px';
			
			if (this.linkHint != null)
			{
				this.linkHint.style.display = 'none';
			}
		};
	
		/**
		 * Updates the hint for the current operation.
		 */
		mxEdgeHandler.prototype.removeHint = mxVertexHandler.prototype.removeHint;
	
		/**
		 * Defines the handles for the UI. Uses data-URIs to speed-up loading time where supported.
		 */
		// TODO: Increase handle padding
		HoverIcons.prototype.mainHandle = (!mxClient.IS_SVG) ? new mxImage(IMAGE_PATH + '/handle-main.png', 17, 17) :
			Graph.createSvgImage(18, 18, '<circle cx="9" cy="9" r="5" stroke="#fff" fill="#007dfc" stroke-width="1"/>');
		HoverIcons.prototype.secondaryHandle = (!mxClient.IS_SVG) ? new mxImage(IMAGE_PATH + '/handle-secondary.png', 17, 17) :
			Graph.createSvgImage(16, 16, '<path d="m 8 3 L 13 8 L 8 13 L 3 8 z" stroke="#fff" fill="#fca000"/>');
		HoverIcons.prototype.fixedHandle = (!mxClient.IS_SVG) ? new mxImage(IMAGE_PATH + '/handle-fixed.png', 17, 17) :
			Graph.createSvgImage(18, 18, '<circle cx="9" cy="9" r="5" stroke="#fff" fill="#007dfc" stroke-width="1"/><path d="m 7 7 L 11 11 M 7 11 L 11 7" stroke="#fff"/>');
		HoverIcons.prototype.terminalHandle = (!mxClient.IS_SVG) ? new mxImage(IMAGE_PATH + '/handle-terminal.png', 17, 17) :
			Graph.createSvgImage(18, 18, '<circle cx="9" cy="9" r="5" stroke="#fff" fill="#007dfc" stroke-width="1"/><circle cx="9" cy="9" r="2" stroke="#fff" fill="transparent"/>');
		HoverIcons.prototype.rotationHandle = new mxImage((mxClient.IS_SVG) ? 'data:image/png;base64,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' :
			IMAGE_PATH + '/handle-rotate.png', 19, 21);
		
		if (mxClient.IS_SVG)
		{
			mxConstraintHandler.prototype.pointImage = Graph.createSvgImage(5, 5, '<path d="m 0 0 L 5 5 M 0 5 L 5 0" stroke="#007dfc"/>');
		}
		
		mxVertexHandler.prototype.handleImage = HoverIcons.prototype.mainHandle;
		mxVertexHandler.prototype.secondaryHandleImage = HoverIcons.prototype.secondaryHandle;
		mxEdgeHandler.prototype.handleImage = HoverIcons.prototype.mainHandle;
		mxEdgeHandler.prototype.terminalHandleImage = HoverIcons.prototype.terminalHandle;
		mxEdgeHandler.prototype.fixedHandleImage = HoverIcons.prototype.fixedHandle;
		mxEdgeHandler.prototype.labelHandleImage = HoverIcons.prototype.secondaryHandle;
		mxOutline.prototype.sizerImage = HoverIcons.prototype.mainHandle;
		
		if (window.Sidebar != null)
		{
			Sidebar.prototype.triangleUp = HoverIcons.prototype.triangleUp;
			Sidebar.prototype.triangleRight = HoverIcons.prototype.triangleRight;
			Sidebar.prototype.triangleDown = HoverIcons.prototype.triangleDown;
			Sidebar.prototype.triangleLeft = HoverIcons.prototype.triangleLeft;
			Sidebar.prototype.refreshTarget = HoverIcons.prototype.refreshTarget;
			Sidebar.prototype.roundDrop = HoverIcons.prototype.roundDrop;
		}

		// Pre-fetches images (only needed for non data-uris)
		if (!mxClient.IS_SVG)
		{
			new Image().src = HoverIcons.prototype.mainHandle.src;
			new Image().src = HoverIcons.prototype.fixedHandle.src;
			new Image().src = HoverIcons.prototype.terminalHandle.src;
			new Image().src = HoverIcons.prototype.secondaryHandle.src;
			new Image().src = HoverIcons.prototype.rotationHandle.src;
			
			new Image().src = HoverIcons.prototype.triangleUp.src;
			new Image().src = HoverIcons.prototype.triangleRight.src;
			new Image().src = HoverIcons.prototype.triangleDown.src;
			new Image().src = HoverIcons.prototype.triangleLeft.src;
			new Image().src = HoverIcons.prototype.refreshTarget.src;
			new Image().src = HoverIcons.prototype.roundDrop.src;
		}
		
		// Adds rotation handle and live preview
		mxVertexHandler.prototype.rotationEnabled = true;
		mxVertexHandler.prototype.manageSizers = true;
		mxVertexHandler.prototype.livePreview = true;
	
		// Increases default rubberband opacity (default is 20)
		mxRubberband.prototype.defaultOpacity = 30;
		
		// Enables connections along the outline, virtual waypoints, parent highlight etc
		mxConnectionHandler.prototype.outlineConnect = true;
		mxCellHighlight.prototype.keepOnTop = true;
		mxVertexHandler.prototype.parentHighlightEnabled = true;
		mxVertexHandler.prototype.rotationHandleVSpacing = -20;
		
		mxEdgeHandler.prototype.parentHighlightEnabled = true;
		mxEdgeHandler.prototype.dblClickRemoveEnabled = true;
		mxEdgeHandler.prototype.straightRemoveEnabled = true;
		mxEdgeHandler.prototype.virtualBendsEnabled = true;
		mxEdgeHandler.prototype.mergeRemoveEnabled = true;
		mxEdgeHandler.prototype.manageLabelHandle = true;
		mxEdgeHandler.prototype.outlineConnect = true;
		
		// Disables adding waypoints if shift is pressed
		mxEdgeHandler.prototype.isAddVirtualBendEvent = function(me)
		{
			return !mxEvent.isShiftDown(me.getEvent());
		};
	
		// Disables custom handles if shift is pressed
		mxEdgeHandler.prototype.isCustomHandleEvent = function(me)
		{
			return !mxEvent.isShiftDown(me.getEvent());
		};
		
		/**
		 * Implements touch style
		 */
		if (Graph.touchStyle)
		{
			// Larger tolerance for real touch devices
			if (mxClient.IS_TOUCH || navigator.maxTouchPoints > 0 || navigator.msMaxTouchPoints > 0)
			{
				mxShape.prototype.svgStrokeTolerance = 18;
				mxVertexHandler.prototype.tolerance = 12;
				mxEdgeHandler.prototype.tolerance = 12;
				Graph.prototype.tolerance = 12;
				
				mxVertexHandler.prototype.rotationHandleVSpacing = -24;
				
				// Implements a smaller tolerance for mouse events and a larger tolerance for touch
				// events on touch devices. The default tolerance (4px) is used for mouse events.
				mxConstraintHandler.prototype.getTolerance = function(me)
				{
					return (mxEvent.isMouseEvent(me.getEvent())) ? 4 : this.graph.getTolerance();
				};
			}
				
			// One finger pans (no rubberband selection) must start regardless of mouse button
			mxPanningHandler.prototype.isPanningTrigger = function(me)
			{
				var evt = me.getEvent();
				
			 	return (me.getState() == null && !mxEvent.isMouseEvent(evt)) ||
			 		(mxEvent.isPopupTrigger(evt) && (me.getState() == null ||
			 		mxEvent.isControlDown(evt) || mxEvent.isShiftDown(evt)));
			};
			
			// Don't clear selection if multiple cells selected
			var graphHandlerMouseDown = mxGraphHandler.prototype.mouseDown;
			mxGraphHandler.prototype.mouseDown = function(sender, me)
			{
				graphHandlerMouseDown.apply(this, arguments);
	
				if (mxEvent.isTouchEvent(me.getEvent()) && this.graph.isCellSelected(me.getCell()) &&
					this.graph.getSelectionCount() > 1)
				{
					this.delayedSelection = false;
				}
			};
		}
		else
		{
			// Removes ctrl+shift as panning trigger for space splitting
			mxPanningHandler.prototype.isPanningTrigger = function(me)
			{
				var evt = me.getEvent();
				
				return (mxEvent.isLeftMouseButton(evt) && ((this.useLeftButtonForPanning &&
						me.getState() == null) || (mxEvent.isControlDown(evt) &&
						!mxEvent.isShiftDown(evt)))) || (this.usePopupTrigger &&
						mxEvent.isPopupTrigger(evt));
			};
		}

		// Overrides/extends rubberband for space handling with Ctrl+Shift(+Alt) drag ("scissors tool")
		mxRubberband.prototype.isSpaceEvent = function(me)
		{
			return this.graph.isEnabled() && !this.graph.isCellLocked(this.graph.getDefaultParent()) &&
				mxEvent.isControlDown(me.getEvent()) && mxEvent.isShiftDown(me.getEvent());
		};
		
		// Handles moving of cells in both half panes
		mxRubberband.prototype.mouseUp = function(sender, me)
		{
			var execute = this.div != null && this.div.style.display != 'none';

			var x0 = null;
			var y0 = null;
			var dx = null;
			var dy = null;

			if (this.first != null && this.currentX != null && this.currentY != null)
			{
				x0 = this.first.x;
				y0 = this.first.y;
				dx = (this.currentX - x0) / this.graph.view.scale;
				dy = (this.currentY - y0) / this.graph.view.scale;

				if (!mxEvent.isAltDown(me.getEvent()))
				{
					dx = this.graph.snap(dx);
					dy = this.graph.snap(dy);
					
					if (!this.graph.isGridEnabled())
					{
						if (Math.abs(dx) < this.graph.tolerance)
						{
							dx = 0;
						}
						
						if (Math.abs(dy) < this.graph.tolerance)
						{
							dy = 0;
						}
					}
				}
			}
			
			this.reset();
			
			if (execute)
			{
				if (mxEvent.isAltDown(me.getEvent()) && this.graph.isToggleEvent(me.getEvent()))
				{
					var rect = new mxRectangle(this.x, this.y, this.width, this.height);
					var cells = this.graph.getCells(rect.x, rect.y, rect.width, rect.height);
					
					this.graph.removeSelectionCells(cells);
				}
				else if (this.isSpaceEvent(me))
				{
					this.graph.model.beginUpdate();
					try
					{
						var cells = this.graph.getCellsBeyond(x0, y0, this.graph.getDefaultParent(), true, true);

						for (var i = 0; i < cells.length; i++)
						{
							if (this.graph.isCellMovable(cells[i]))
							{
								var tmp = this.graph.view.getState(cells[i]);
								var geo = this.graph.getCellGeometry(cells[i]);
								
								if (tmp != null && geo != null)
								{
									geo = geo.clone();
									geo.translate(dx, dy);
									this.graph.model.setGeometry(cells[i], geo);
								}
							}
						}
					}
					finally
					{
						this.graph.model.endUpdate();
					}
				}
				else
				{
					var rect = new mxRectangle(this.x, this.y, this.width, this.height);
					this.graph.selectRegion(rect, me.getEvent());
				}
				
				me.consume();
			}
		};
		
		// Handles preview for creating/removing space in diagram
		mxRubberband.prototype.mouseMove = function(sender, me)
		{
			if (!me.isConsumed() && this.first != null)
			{
				var origin = mxUtils.getScrollOrigin(this.graph.container);
				var offset = mxUtils.getOffset(this.graph.container);
				origin.x -= offset.x;
				origin.y -= offset.y;
				var x = me.getX() + origin.x;
				var y = me.getY() + origin.y;
				var dx = this.first.x - x;
				var dy = this.first.y - y;
				var tol = this.graph.tolerance;
				
				if (this.div != null || Math.abs(dx) > tol ||  Math.abs(dy) > tol)
				{
					if (this.div == null)
					{
						this.div = this.createShape();
					}
					
					// Clears selection while rubberbanding. This is required because
					// the event is not consumed in mouseDown.
					mxUtils.clearSelection();
					this.update(x, y);
					
					if (this.isSpaceEvent(me))
					{
						var right = this.x + this.width;
						var bottom = this.y + this.height;
						var scale = this.graph.view.scale;
						
						if (!mxEvent.isAltDown(me.getEvent()))
						{
							this.width = this.graph.snap(this.width / scale) * scale;
							this.height = this.graph.snap(this.height / scale) * scale;
							
							if (!this.graph.isGridEnabled())
							{
								if (this.width < this.graph.tolerance)
								{
									this.width = 0;
								}
								
								if (this.height < this.graph.tolerance)
								{
									this.height = 0;
								}
							}
							
							if (this.x < this.first.x)
							{
								this.x = right - this.width;
							}
							
							if (this.y < this.first.y)
							{
								this.y = bottom - this.height;
							}
						}
						
						this.div.style.borderStyle = 'dashed';
						this.div.style.backgroundColor = 'white';
						this.div.style.left = this.x + 'px';
						this.div.style.top = this.y + 'px';
						this.div.style.width = Math.max(0, this.width) + 'px';
						this.div.style.height = this.graph.container.clientHeight + 'px';
						this.div.style.borderWidth = (this.width <= 0) ? '0px 1px 0px 0px' : '0px 1px 0px 1px';
						
						if (this.secondDiv == null)
						{
							this.secondDiv = this.div.cloneNode(true);
							this.div.parentNode.appendChild(this.secondDiv);
						}
						
						this.secondDiv.style.left = this.x + 'px';
						this.secondDiv.style.top = this.y + 'px';
						this.secondDiv.style.width = this.graph.container.clientWidth + 'px';
						this.secondDiv.style.height = Math.max(0, this.height) + 'px';
						this.secondDiv.style.borderWidth = (this.height <= 0) ? '1px 0px 0px 0px' : '1px 0px 1px 0px';
					}
					else
					{
						// Hides second div and restores style
						this.div.style.backgroundColor = '';
						this.div.style.borderWidth = '';
						this.div.style.borderStyle = '';
						
						if (this.secondDiv != null)
						{
							this.secondDiv.parentNode.removeChild(this.secondDiv);
							this.secondDiv = null;
						}
					}

					me.consume();
				}
			}
		};
		
		// Removes preview
		var mxRubberbandReset = mxRubberband.prototype.reset;
		mxRubberband.prototype.reset = function()
		{
			if (this.secondDiv != null)
			{
				this.secondDiv.parentNode.removeChild(this.secondDiv);
				this.secondDiv = null;
			}
			
			mxRubberbandReset.apply(this, arguments);
		};
		
	    // Timer-based activation of outline connect in connection handler
	    var startTime = new Date().getTime();
	    var timeOnTarget = 0;
	    
		var mxEdgeHandlerUpdatePreviewState = mxEdgeHandler.prototype.updatePreviewState;
		
		mxEdgeHandler.prototype.updatePreviewState = function(edge, point, terminalState, me)
		{
			mxEdgeHandlerUpdatePreviewState.apply(this, arguments);
			
	    	if (terminalState != this.currentTerminalState)
	    	{
	    		startTime = new Date().getTime();
	    		timeOnTarget = 0;
	    	}
	    	else
	    	{
		    	timeOnTarget = new Date().getTime() - startTime;
	    	}
			
			this.currentTerminalState = terminalState;
		};
	
		// Timer-based outline connect
		var mxEdgeHandlerIsOutlineConnectEvent = mxEdgeHandler.prototype.isOutlineConnectEvent;
		
		mxEdgeHandler.prototype.isOutlineConnectEvent = function(me)
		{
			return (this.currentTerminalState != null && me.getState() == this.currentTerminalState && timeOnTarget > 2000) ||
				((this.currentTerminalState == null || mxUtils.getValue(this.currentTerminalState.style, 'outlineConnect', '1') != '0') &&
				mxEdgeHandlerIsOutlineConnectEvent.apply(this, arguments));
		};
		
		// Disables custom handles if shift is pressed
		mxVertexHandler.prototype.isCustomHandleEvent = function(me)
		{
			return !mxEvent.isShiftDown(me.getEvent());
		};
	
		// Shows secondary handle for fixed connection points
		mxEdgeHandler.prototype.createHandleShape = function(index, virtual)
		{
			var source = index != null && index == 0;
			var terminalState = this.state.getVisibleTerminalState(source);
			var c = (index != null && (index == 0 || index >= this.state.absolutePoints.length - 1 ||
				(this.constructor == mxElbowEdgeHandler && index == 2))) ?
				this.graph.getConnectionConstraint(this.state, terminalState, source) : null;
			var pt = (c != null) ? this.graph.getConnectionPoint(this.state.getVisibleTerminalState(source), c) : null;
			var img = (pt != null) ? this.fixedHandleImage : ((c != null && terminalState != null) ?
				this.terminalHandleImage : this.handleImage);
			
			if (img != null)
			{
				var shape = new mxImageShape(new mxRectangle(0, 0, img.width, img.height), img.src);
				
				// Allows HTML rendering of the images
				shape.preserveImageAspect = false;
	
				return shape;
			}
			else
			{
				var s = mxConstants.HANDLE_SIZE;
				
				if (this.preferHtml)
				{
					s -= 1;
				}
				
				return new mxRectangleShape(new mxRectangle(0, 0, s, s), mxConstants.HANDLE_FILLCOLOR, mxConstants.HANDLE_STROKECOLOR);
			}
		};
	
		var vertexHandlerCreateSizerShape = mxVertexHandler.prototype.createSizerShape;
		mxVertexHandler.prototype.createSizerShape = function(bounds, index, fillColor)
		{
			this.handleImage = (index == mxEvent.ROTATION_HANDLE) ? HoverIcons.prototype.rotationHandle : (index == mxEvent.LABEL_HANDLE) ? this.secondaryHandleImage : this.handleImage;
			
			return vertexHandlerCreateSizerShape.apply(this, arguments);
		};
		
		// Special case for single edge label handle moving in which case the text bounding box is used
		var mxGraphHandlerGetBoundingBox = mxGraphHandler.prototype.getBoundingBox;
		mxGraphHandler.prototype.getBoundingBox = function(cells)
		{
			if (cells != null && cells.length == 1)
			{
				var model = this.graph.getModel();
				var parent = model.getParent(cells[0]);
				var geo = this.graph.getCellGeometry(cells[0]);
				
				if (model.isEdge(parent) && geo != null && geo.relative)
				{
					var state = this.graph.view.getState(cells[0]);
					
					if (state != null && state.width < 2 && state.height < 2 && state.text != null && state.text.boundingBox != null)
					{
						return mxRectangle.fromRectangle(state.text.boundingBox);
					}
				}
			}
			
			return mxGraphHandlerGetBoundingBox.apply(this, arguments);
		};
		
		// Uses text bounding box for edge labels
		var mxVertexHandlerGetSelectionBounds = mxVertexHandler.prototype.getSelectionBounds;
		mxVertexHandler.prototype.getSelectionBounds = function(state)
		{
			var model = this.graph.getModel();
			var parent = model.getParent(state.cell);
			var geo = this.graph.getCellGeometry(state.cell);
			
			if (model.isEdge(parent) && geo != null && geo.relative && state.width < 2 && state.height < 2 && state.text != null && state.text.boundingBox != null)
			{
				var bbox = state.text.unrotatedBoundingBox || state.text.boundingBox;
				
				return new mxRectangle(Math.round(bbox.x), Math.round(bbox.y), Math.round(bbox.width), Math.round(bbox.height));
			}
			else
			{
				return mxVertexHandlerGetSelectionBounds.apply(this, arguments);
			}
		};
	
		// Redirects moving of edge labels to mxGraphHandler by not starting here.
		// This will use the move preview of mxGraphHandler (see above).
		var mxVertexHandlerMouseDown = mxVertexHandler.prototype.mouseDown;
		mxVertexHandler.prototype.mouseDown = function(sender, me)
		{
			var model = this.graph.getModel();
			var parent = model.getParent(this.state.cell);
			var geo = this.graph.getCellGeometry(this.state.cell);
			
			// Lets rotation events through
			var handle = this.getHandleForEvent(me);
			
			if (handle == mxEvent.ROTATION_HANDLE || !model.isEdge(parent) || geo == null || !geo.relative ||
				this.state == null || this.state.width >= 2 || this.state.height >= 2)
			{
				mxVertexHandlerMouseDown.apply(this, arguments);
			}
		};

		// Shows rotation handle for edge labels.
		mxVertexHandler.prototype.isRotationHandleVisible = function()
		{
			return this.graph.isEnabled() && this.rotationEnabled && this.graph.isCellRotatable(this.state.cell) &&
				(mxGraphHandler.prototype.maxCells <= 0 || this.graph.getSelectionCount() < mxGraphHandler.prototype.maxCells);
		};
	
		// Invokes turn on single click on rotation handle
		mxVertexHandler.prototype.rotateClick = function()
		{
			this.state.view.graph.turnShapes([this.state.cell]);
		};
		
		var vertexHandlerMouseMove = mxVertexHandler.prototype.mouseMove;
	
		// Workaround for "isConsumed not defined" in MS Edge is to use arguments
		mxVertexHandler.prototype.mouseMove = function(sender, me)
		{
			vertexHandlerMouseMove.apply(this, arguments);
			
			if (this.graph.graphHandler.first != null)
			{
				if (this.rotationShape != null && this.rotationShape.node != null)
				{
					this.rotationShape.node.style.display = 'none';
				}
			}
		};
		
		var vertexHandlerMouseUp = mxVertexHandler.prototype.mouseUp;
		mxVertexHandler.prototype.mouseUp = function(sender, me)
		{
			vertexHandlerMouseUp.apply(this, arguments);
			
			// Shows rotation handle only if one vertex is selected
			if (this.rotationShape != null && this.rotationShape.node != null)
			{
				this.rotationShape.node.style.display = (this.graph.getSelectionCount() == 1) ? '' : 'none';
			}
		};
	
		var vertexHandlerInit = mxVertexHandler.prototype.init;
		mxVertexHandler.prototype.init = function()
		{
			vertexHandlerInit.apply(this, arguments);
			var redraw = false;
			
			if (this.rotationShape != null)
			{
				this.rotationShape.node.setAttribute('title', mxResources.get('rotateTooltip'));
			}
			
			var update = mxUtils.bind(this, function()
			{
				// Shows rotation handle only if one vertex is selected
				if (this.rotationShape != null && this.rotationShape.node != null)
				{
					this.rotationShape.node.style.display = (this.graph.getSelectionCount() == 1) ? '' : 'none';
				}
				
				if (this.specialHandle != null)
				{
					this.specialHandle.node.style.display = (this.graph.isEnabled() && this.graph.getSelectionCount() < this.graph.graphHandler.maxCells) ? '' : 'none';
				}
				
				this.redrawHandles();
			});
			
			this.selectionHandler = mxUtils.bind(this, function(sender, evt)
			{
				update();
			});
			
			this.graph.getSelectionModel().addListener(mxEvent.CHANGE, this.selectionHandler);
			
			this.changeHandler = mxUtils.bind(this, function(sender, evt)
			{
				this.updateLinkHint(this.graph.getLinkForCell(this.state.cell),
					this.graph.getLinksForState(this.state));
				update();
			});
			
			this.graph.getModel().addListener(mxEvent.CHANGE, this.changeHandler);
			
			// Repaint needed when editing stops and no change event is fired
			this.editingHandler = mxUtils.bind(this, function(sender, evt)
			{
				this.redrawHandles();
			});
			
			this.graph.addListener(mxEvent.EDITING_STOPPED, this.editingHandler);

			var link = this.graph.getLinkForCell(this.state.cell);
			var links = this.graph.getLinksForState(this.state);
			this.updateLinkHint(link, links);
			
			if (link != null || (links != null && links.length > 0))
			{
				redraw = true;
			}
			
			if (redraw)
			{
				this.redrawHandles();
			}
		};
	
		mxVertexHandler.prototype.updateLinkHint = function(link, links)
		{
			if ((link == null && (links == null || links.length == 0)) ||
				this.graph.getSelectionCount() > 1)
			{
				if (this.linkHint != null)
				{
					this.linkHint.parentNode.removeChild(this.linkHint);
					this.linkHint = null;
				}
			}
			else if (link != null || (links != null && links.length > 0))
			{
				if (this.linkHint == null)
				{
					this.linkHint = createHint();
					this.linkHint.style.padding = '6px 8px 6px 8px';
					this.linkHint.style.fontSize = '90%';
					this.linkHint.style.opacity = '1';
					this.linkHint.style.filter = '';
					
					this.graph.container.appendChild(this.linkHint);
				}

				this.linkHint.innerHTML = '';
				
				if (link != null)
				{
					this.linkHint.appendChild(this.graph.createLinkForHint(link));
					
					if (this.graph.isEnabled() && typeof this.graph.editLink === 'function')
					{
						var changeLink = document.createElement('img');
						changeLink.setAttribute('src', IMAGE_PATH + '/edit.gif');
						changeLink.setAttribute('title', mxResources.get('editLink'));
						changeLink.setAttribute('width', '11');
						changeLink.setAttribute('height', '11');
						changeLink.style.marginLeft = '10px';
						changeLink.style.marginBottom = '-1px';
						changeLink.style.cursor = 'pointer';
						this.linkHint.appendChild(changeLink);
						
						mxEvent.addListener(changeLink, 'click', mxUtils.bind(this, function(evt)
						{
							this.graph.setSelectionCell(this.state.cell);
							this.graph.editLink();
							mxEvent.consume(evt);
						}));
						
						var removeLink = document.createElement('img');
						removeLink.setAttribute('src', Dialog.prototype.clearImage);
						removeLink.setAttribute('title', mxResources.get('removeIt', [mxResources.get('link')]));
						removeLink.setAttribute('width', '13');
						removeLink.setAttribute('height', '10');
						removeLink.style.marginLeft = '4px';
						removeLink.style.marginBottom = '-1px';
						removeLink.style.cursor = 'pointer';
						this.linkHint.appendChild(removeLink);
						
						mxEvent.addListener(removeLink, 'click', mxUtils.bind(this, function(evt)
						{
							this.graph.setLinkForCell(this.state.cell, null);
							mxEvent.consume(evt);
						}));
					}
				}

				if (links != null)
				{
					for (var i = 0; i < links.length; i++)
					{
						var div = document.createElement('div');
						div.style.marginTop = (link != null || i > 0) ? '6px' : '0px';
						div.appendChild(this.graph.createLinkForHint(
								links[i].getAttribute('href'),
								mxUtils.getTextContent(links[i])));
						
						this.linkHint.appendChild(div);
					}
				}
			}
		};
		
		mxEdgeHandler.prototype.updateLinkHint = mxVertexHandler.prototype.updateLinkHint;
		
		var edgeHandlerInit = mxEdgeHandler.prototype.init;
		mxEdgeHandler.prototype.init = function()
		{
			edgeHandlerInit.apply(this, arguments);
			
			// Disables connection points
			this.constraintHandler.isEnabled = mxUtils.bind(this, function()
			{
				return this.state.view.graph.connectionHandler.isEnabled();
			});
			
			var update = mxUtils.bind(this, function()
			{
				if (this.linkHint != null)
				{
					this.linkHint.style.display = (this.graph.getSelectionCount() == 1) ? '' : 'none';
				}
				
				if (this.labelShape != null)
				{
					this.labelShape.node.style.display = (this.graph.isEnabled() && this.graph.getSelectionCount() < this.graph.graphHandler.maxCells) ? '' : 'none';
				}
			});
	
			this.selectionHandler = mxUtils.bind(this, function(sender, evt)
			{
				update();
			});
			
			this.graph.getSelectionModel().addListener(mxEvent.CHANGE, this.selectionHandler);
			
			this.changeHandler = mxUtils.bind(this, function(sender, evt)
			{
				this.updateLinkHint(this.graph.getLinkForCell(this.state.cell),
					this.graph.getLinksForState(this.state));
				update();
				this.redrawHandles();
			});
			
			this.graph.getModel().addListener(mxEvent.CHANGE, this.changeHandler);
	
			var link = this.graph.getLinkForCell(this.state.cell);
			var links = this.graph.getLinksForState(this.state);
									
			if (link != null || (links != null && links.length > 0))
			{
				this.updateLinkHint(link, links);
				this.redrawHandles();
			}
		};
	
		// Disables connection points
		var connectionHandlerInit = mxConnectionHandler.prototype.init;
		
		mxConnectionHandler.prototype.init = function()
		{
			connectionHandlerInit.apply(this, arguments);
			
			this.constraintHandler.isEnabled = mxUtils.bind(this, function()
			{
				return this.graph.connectionHandler.isEnabled();
			});
		};
	
		var vertexHandlerRedrawHandles = mxVertexHandler.prototype.redrawHandles;
		mxVertexHandler.prototype.redrawHandles = function()
		{
			vertexHandlerRedrawHandles.apply(this);

			if (this.state != null && this.linkHint != null)
			{
				var c = new mxPoint(this.state.getCenterX(), this.state.getCenterY());
				var tmp = new mxRectangle(this.state.x, this.state.y - 22, this.state.width + 24, this.state.height + 22);
				var bb = mxUtils.getBoundingBox(tmp, this.state.style[mxConstants.STYLE_ROTATION] || '0', c);
				var rs = (bb != null) ? mxUtils.getBoundingBox(this.state,
					this.state.style[mxConstants.STYLE_ROTATION] || '0') : this.state;
				var tb = (this.state.text != null) ? this.state.text.boundingBox : null;
				
				if (bb == null)
				{
					bb = this.state;
				}
				
				var b = bb.y + bb.height;
				
				if (tb != null)
				{
					b = Math.max(b, tb.y + tb.height);
				}
				
				this.linkHint.style.left = Math.max(0, Math.round(rs.x + (rs.width - this.linkHint.clientWidth) / 2)) + 'px';
				this.linkHint.style.top = Math.round(b + this.verticalOffset / 2 + 6 +
					this.state.view.graph.tolerance) + 'px';
			}
		};

		
		var vertexHandlerReset = mxVertexHandler.prototype.reset;
		mxVertexHandler.prototype.reset = function()
		{
			vertexHandlerReset.apply(this, arguments);
			
			// Shows rotation handle only if one vertex is selected
			if (this.rotationShape != null && this.rotationShape.node != null)
			{
				this.rotationShape.node.style.display = (this.graph.getSelectionCount() == 1) ? '' : 'none';
			}
		};
	
		var vertexHandlerDestroy = mxVertexHandler.prototype.destroy;
		mxVertexHandler.prototype.destroy = function()
		{
			vertexHandlerDestroy.apply(this, arguments);
			
			if (this.linkHint != null)
			{
				this.linkHint.parentNode.removeChild(this.linkHint);
				this.linkHint = null;
			}

			if (this.selectionHandler != null)
			{
				this.graph.getSelectionModel().removeListener(this.selectionHandler);
				this.selectionHandler = null;
			}
			
			if  (this.changeHandler != null)
			{
				this.graph.getModel().removeListener(this.changeHandler);
				this.changeHandler = null;
			}
			
			if  (this.editingHandler != null)
			{
				this.graph.removeListener(this.editingHandler);
				this.editingHandler = null;
			}
		};
		
		var edgeHandlerRedrawHandles = mxEdgeHandler.prototype.redrawHandles;
		mxEdgeHandler.prototype.redrawHandles = function()
		{
			// Workaround for special case where handler
			// is reset before this which leads to a NPE
			if (this.marker != null)
			{
				edgeHandlerRedrawHandles.apply(this);
		
				if (this.state != null && this.linkHint != null)
				{
					var b = this.state;
					
					if (this.state.text != null && this.state.text.bounds != null)
					{
						b = new mxRectangle(b.x, b.y, b.width, b.height);
						b.add(this.state.text.bounds);
					}
					
					this.linkHint.style.left = Math.max(0, Math.round(b.x + (b.width - this.linkHint.clientWidth) / 2)) + 'px';
					this.linkHint.style.top = Math.round(b.y + b.height + 6 + this.state.view.graph.tolerance) + 'px';
				}
			}
		};
	
		var edgeHandlerReset = mxEdgeHandler.prototype.reset;
		mxEdgeHandler.prototype.reset = function()
		{
			edgeHandlerReset.apply(this, arguments);
			
			if (this.linkHint != null)
			{
				this.linkHint.style.visibility = '';
			}
		};
		
		var edgeHandlerDestroy = mxEdgeHandler.prototype.destroy;
		mxEdgeHandler.prototype.destroy = function()
		{
			edgeHandlerDestroy.apply(this, arguments);
			
			if (this.linkHint != null)
			{
				this.linkHint.parentNode.removeChild(this.linkHint);
				this.linkHint = null;
			}
	
			if (this.selectionHandler != null)
			{
				this.graph.getSelectionModel().removeListener(this.selectionHandler);
				this.selectionHandler = null;
			}
	
			if  (this.changeHandler != null)
			{
				this.graph.getModel().removeListener(this.changeHandler);
				this.changeHandler = null;
			}
		};
	})();
}