bundles/org.eclipse.rap.zest.core/src/org/eclipse/zest/core/widgets/GraphNode.java

/*******************************************************************************
 * Copyright 2005, CHISEL Group, University of Victoria, Victoria, BC, Canada.
 * All rights reserved. This program and the accompanying materials are made
 * available under the terms of the Eclipse Public License v1.0 which
 * accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors: The Chisel Group, University of Victoria
 ******************************************************************************/
package org.eclipse.zest.core.widgets;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.eclipse.draw2d.ColorConstants;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.Label;
import org.eclipse.draw2d.geometry.Dimension;
import org.eclipse.draw2d.geometry.Insets;
import org.eclipse.draw2d.geometry.Point;
import org.eclipse.draw2d.geometry.PrecisionPoint;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Display;
import org.eclipse.zest.core.widgets.internal.GraphLabel;
import org.eclipse.zest.layouts.LayoutEntity;
import org.eclipse.zest.layouts.constraints.LayoutConstraint;

/*
 * Simple node class which has the following properties: color, size, location,
 * and a label. It also has a list of connections and anchors.
 * 
 * @author Chris Callendar
 * 
 * @author Del Myers
 * 
 * @author Ian Bull
 */
public class GraphNode extends GraphItem {
	public static final int HIGHLIGHT_NONE = 0;
	public static final int HIGHLIGHT_ON = 1;
	// @tag ADJACENT : Removed highlight adjacent
	//public static final int HIGHLIGHT_ADJACENT = 2;

	private int nodeStyle;

	private List /* IGraphModelConnection */sourceConnections;
	private List /* IGraphModelConnection */targetConnections;

	private Color foreColor;
	private Color backColor;
	private Color highlightColor;
	// @tag ADJACENT : Removed highlight adjacent
	//private Color highlightAdjacentColor;
	private Color borderColor;
	private Color borderHighlightColor;
	private int borderWidth;
	private Point currentLocation;
	protected Dimension size;
	private Font font;
	private boolean cacheLabel;
	private boolean visible = true;
	private LayoutEntity layoutEntity;

	protected Graph graph;
	protected IContainer parent;

	/** The internal node. */
	protected Object internalNode;
	private boolean selected;
	protected int highlighted = HIGHLIGHT_NONE;
	private IFigure tooltip;
	protected IFigure nodeFigure;

	private boolean isDisposed = false;
	private boolean hasCustomTooltip;

	public GraphNode(IContainer graphModel, int style) {
		this(graphModel, style, null);
	}

	public GraphNode(IContainer graphModel, int style, Object data) {
		this(graphModel.getGraph(), style, "" /*text*/, null /*image*/, data);
	}

	public GraphNode(IContainer graphModel, int style, String text) {
		this(graphModel, style, text, null);
	}

	public GraphNode(IContainer graphModel, int style, String text, Object data) {
		this(graphModel.getGraph(), style, text, null /*image*/, data);
	}

	public GraphNode(IContainer graphModel, int style, String text, Image image) {
		this(graphModel, style, text, image, null);
	}

	public GraphNode(IContainer graphModel, int style, String text, Image image, Object data) {
		super(graphModel.getGraph(), style, data);
		initModel(graphModel, text, image);
		if (nodeFigure == null) {
			initFigure();
		}

		// This is a hack because JAVA sucks!
		// I don't want to expose addNode so I can't put it in the
		// IContainer interface.  
		if (this.parent.getItemType() == GRAPH) {
			((Graph) this.parent).addNode(this);
		} else if (this.parent.getItemType() == CONTAINER) {
			((GraphContainer) this.parent).addNode(this);
		}
		this.parent.getGraph().registerItem(this);
	}

	protected void initFigure() {
		nodeFigure = createFigureForModel();
	}

	static int count = 0;

	protected void initModel(IContainer parent, String text, Image image) {
		this.nodeStyle |= parent.getGraph().getNodeStyle();
		this.parent = parent;
		this.sourceConnections = new ArrayList();
		this.targetConnections = new ArrayList();
		this.foreColor = parent.getGraph().DARK_BLUE;
		this.backColor = parent.getGraph().LIGHT_BLUE;
		this.highlightColor = parent.getGraph().HIGHLIGHT_COLOR;
		// @tag ADJACENT : Removed highlight adjacent
		//this.highlightAdjacentColor = ColorConstants.orange();
		this.nodeStyle = SWT.NONE;
		this.borderColor = ColorConstants.lightGray();
		this.borderHighlightColor = ColorConstants.blue();
		this.borderWidth = 1;
		this.currentLocation = new PrecisionPoint(0, 0);
		this.size = new Dimension(-1, -1);
		this.font = Display.getDefault().getSystemFont();
		this.graph = parent.getGraph();
		this.cacheLabel = false;
		this.setText(text);
		this.layoutEntity = new LayoutGraphNode();
		if (image != null) {
			this.setImage(image);
		}

		if (font == null) {
			font = Display.getDefault().getSystemFont();
		}

	}

	/**
	 * A simple toString that we can use for debugging
	 */
	public String toString() {
		return "GraphModelNode: " + getText();
	}

	public LayoutEntity getLayoutEntity() {
		return layoutEntity;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.mylar.zest.core.widgets.GraphItem#dispose()
	 */
	public void dispose() {
		if (isFisheyeEnabled) {
			this.fishEye(false, false);
		}
		super.dispose();
		this.isDisposed = true;
		while (getSourceConnections().size() > 0) {
			GraphConnection connection = (GraphConnection) getSourceConnections().get(0);
			if (!connection.isDisposed()) {
				connection.dispose();
			} else {
				removeSourceConnection(connection);
			}
		}
		while (getTargetConnections().size() > 0) {
			GraphConnection connection = (GraphConnection) getTargetConnections().get(0);
			if (!connection.isDisposed()) {
				connection.dispose();
			} else {
				removeTargetConnection(connection);
			}
		}
		graph.removeNode(this);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.swt.widgets.Widget#isDisposed()
	 */
	public boolean isDisposed() {
		return isDisposed;
	}

	/**
	 * Determines if this node has a fixed size or if it is packed to the size of its contents.
	 * To set a node to pack, set its size (-1, -1)  
	 * @return
	 */
	public boolean isSizeFixed() {
		return !(this.size.width < 0 && this.size.height < 0);
	}

	/**
	 * Returns a new list of the source connections (GraphModelConnection
	 * objects).
	 * 
	 * @return List a new list of GraphModelConnect objects
	 */
	public List getSourceConnections() {
		return new ArrayList(sourceConnections);
	}

	/**
	 * Returns a new list of the target connections (GraphModelConnection
	 * objects).
	 * 
	 * @return List a new list of GraphModelConnect objects
	 */
	public List getTargetConnections() {
		return new ArrayList(targetConnections);
	}

	/**
	 * Returns the bounds of this node. It is just the combination of the
	 * location and the size.
	 * 
	 * @return Rectangle
	 */
	Rectangle getBounds() {
		return new Rectangle(getLocation(), getSize());
	}

	/**
	 * Returns a copy of the node's location.
	 * 
	 * @return Point
	 */
	public Point getLocation() {
		return currentLocation;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.mylar.zest.core.internal.graphmodel.IGraphModelNode#isSelected()
	 */
	public boolean isSelected() {
		return selected;
	}

	/**
	 * Sets the current location for this node.
	 */
	public void setLocation(double x, double y) {
		currentLocation.x = (int) x;
		currentLocation.y = (int) y;
		refreshLocation();
	}

	/**
	 * Returns a copy of the node's size.
	 * 
	 * @return Dimension
	 */
	public Dimension getSize() {
		if (size.height < 0 && size.width < 0 && nodeFigure != null) {
			return nodeFigure.getSize().getCopy();
		}
		return size.getCopy();
	}

	/**
	 * Get the foreground colour for this node
	 */
	public Color getForegroundColor() {
		return foreColor;
	}

	/**
	 * Set the foreground colour for this node
	 */
	public void setForegroundColor(Color c) {
		this.foreColor = c;
		updateFigureForModel(nodeFigure);
	}

	/**
	 * Get the background colour for this node. This is the color the node will
	 * be if it is not currently highlighted. This color is meaningless if a
	 * custom figure has been set.
	 */
	public Color getBackgroundColor() {
		return backColor;
	}

	/**
	 * Permanently sets the background color (unhighlighted). This color has no
	 * effect if a custom figure has been set.
	 * 
	 * @param c
	 */
	public void setBackgroundColor(Color c) {
		backColor = c;
		updateFigureForModel(nodeFigure);
	}

	/**
	 * Sets the tooltip on this node. This tooltip will display if the mouse
	 * hovers over the node. Setting the tooltip has no effect if a custom
	 * figure has been set.
	 */
	public void setTooltip(IFigure tooltip) {
		hasCustomTooltip = true;
		this.tooltip = tooltip;
		updateFigureForModel(nodeFigure);
	}

	/**
	 * Gets the current tooltip for this node. The tooltip returned is
	 * meaningless if a custom figure has been set.
	 */
	public IFigure getTooltip() {
		return this.tooltip;
	}

	/**
	 * Sets the border color.
	 * 
	 * @param c
	 *            the border color.
	 */
	public void setBorderColor(Color c) {
		borderColor = c;
		updateFigureForModel(nodeFigure);
	}

	/**
	 * Sets the highlighted border color.
	 * 
	 * @param c
	 *            the highlighted border color.
	 */
	public void setBorderHighlightColor(Color c) {
		this.borderHighlightColor = c;
		updateFigureForModel(nodeFigure);
	}

	/**
	 * Get the highlight colour for this node
	 */
	public Color getHighlightColor() {
		return highlightColor;
	}

	/**
	 * Set the highlight colour for this node
	 */
	public void setHighlightColor(Color c) {
		this.highlightColor = c;
	}

	/**
	 * Get the highlight adjacent colour for this node. This is the colour that
	 * adjacent nodes will get
	 */
	// @tag ADJACENT : Removed highlight adjacent
	/*
	public Color getHighlightAdjacentColor() {
		return highlightAdjacentColor;
	}
	*/

	/**
	 * Set the highlight adjacent colour for this node. This is the colour that
	 * adjacent node will get.
	 */
	// @tag ADJACENT : Removed highlight adjacent
	/*
	public void setHighlightAdjacentColor(Color c) {
		this.highlightAdjacentColor = c;
	}
	*/

	/**
	 * Highlights the node changing the background color and border color. The
	 * source and destination connections are also highlighted, and the adjacent
	 * nodes are highlighted too in a different color.
	 */
	public void highlight() {
		if (highlighted == HIGHLIGHT_ON) {
			return;
		}
		// @tag ADJACENT : Removed highlight adjacent
		/*
		if (ZestStyles.checkStyle(getNodeStyle(), ZestStyles.NODES_HIGHLIGHT_ADJACENT)) {
			for (Iterator iter = sourceConnections.iterator(); iter.hasNext();) {
				GraphConnection conn = (GraphConnection) iter.next();
				conn.highlight();
				conn.getDestination().highlightAdjacent();
			}
			for (Iterator iter = targetConnections.iterator(); iter.hasNext();) {
				GraphConnection conn = (GraphConnection) iter.next();
				conn.highlight();
				conn.getSource().highlightAdjacent();
			}
		}
		*/
		if (parent.getItemType() == GraphItem.CONTAINER) {
			((GraphContainer) parent).highlightNode(this);
		} else {
			((Graph) parent).highlightNode(this);
		}
		highlighted = HIGHLIGHT_ON;
		updateFigureForModel(getNodeFigure());
	}

	/**
	 * Restores the nodes original background color and border width.
	 */
	public void unhighlight() {

		// @tag ADJACENT : Removed highlight adjacent
		//boolean highlightedAdjacently = (highlighted == HIGHLIGHT_ADJACENT);
		if (highlighted == HIGHLIGHT_NONE) {
			return;
		}
		// @tag ADJACENT : Removed highlight adjacent
		/*
		if (!highlightedAdjacently) {
			// IF we are highlighted as an adjacent node, we don't need to deal
			// with our connections.
			if (ZestStyles.checkStyle(getNodeStyle(), ZestStyles.NODES_HIGHLIGHT_ADJACENT)) {
				// unhighlight the adjacent edges
				for (Iterator iter = sourceConnections.iterator(); iter.hasNext();) {
					GraphConnection conn = (GraphConnection) iter.next();
					conn.unhighlight();
					if (conn.getDestination() != this) {
						conn.getDestination().unhighlight();
					}
				}
				for (Iterator iter = targetConnections.iterator(); iter.hasNext();) {
					GraphConnection conn = (GraphConnection) iter.next();
					conn.unhighlight();
					if (conn.getSource() != this) {
						conn.getSource().unhighlight();
					}
				}
			}
		}
		*/
		if (parent.getItemType() == GraphItem.CONTAINER) {
			((GraphContainer) parent).unhighlightNode(this);
		} else {
			((Graph) parent).unhighlightNode(this);
		}
		highlighted = HIGHLIGHT_NONE;
		updateFigureForModel(nodeFigure);

	}

	protected void refreshLocation() {
		Point loc = this.getLocation();
		Dimension size = this.getSize();
		Rectangle bounds = new Rectangle(loc, size);

		if (nodeFigure == null || nodeFigure.getParent() == null) {
			return; // node figure has not been created yet
		}
		//nodeFigure.setBounds(bounds);
		nodeFigure.getParent().setConstraint(nodeFigure, bounds);
	}

	/**
	 * Highlights this node using the adjacent highlight color. This only does
	 * something if highlighAdjacentNodes is set to true and if the node isn't
	 * already highlighted.
	 * 
	 * @see #setHighlightAdjacentNodes(boolean)
	 */
	// @tag ADJACENT : removed highlight adjacent
	/*
	public void highlightAdjacent() {
		if (highlighted > 0) {
			return;
		}
		highlighted = HIGHLIGHT_ADJACENT;
		updateFigureForModel(nodeFigure);
		if (parent.getItemType() == GraphItem.CONTAINER) {
			((GraphContainer) parent).highlightNode(this);
		} else {
			((Graph) parent).highlightNode(this);
		}
	}
	*/

	/**
	 * Returns if the nodes adjacent to this node will be highlighted when this
	 * node is selected.
	 * 
	 * @return GraphModelNode
	 */
	// @tag ADJACENT : Removed highlight adjacent
	/*
	public boolean isHighlightAdjacentNodes() {
		return ZestStyles.checkStyle(nodeStyle, ZestStyles.NODES_HIGHLIGHT_ADJACENT);
	}
	*/

	/**
	 * Sets if the adjacent nodes to this one should be highlighted when this
	 * node is selected.
	 * 
	 * @param highlightAdjacentNodes
	 *            The highlightAdjacentNodes to set.
	 */
	// @tag ADJACENT : Removed highlight adjacent
	/*
	public void setHighlightAdjacentNodes(boolean highlightAdjacentNodes) {
		if (!highlightAdjacentNodes) {
			this.nodeStyle |= ZestStyles.NODES_HIGHLIGHT_ADJACENT;
			this.nodeStyle ^= ZestStyles.NODES_HIGHLIGHT_ADJACENT;
			return;
		}
		this.nodeStyle |= ZestStyles.NODES_HIGHLIGHT_ADJACENT;
	}
	*/

	public Color getBorderColor() {
		return borderColor;
	}

	public int getBorderWidth() {
		return borderWidth;
	}

	public void setBorderWidth(int width) {
		this.borderWidth = width;
		updateFigureForModel(nodeFigure);
	}

	public Font getFont() {
		return font;
	}

	public void setFont(Font font) {
		this.font = font;
		updateFigureForModel(nodeFigure);
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.swt.widgets.Item#setText(java.lang.String)
	 */
	public void setText(String string) {
		if (string == null) {
			string = "";
		}
		super.setText(string);

		if (nodeFigure != null) {
			updateFigureForModel(this.nodeFigure);
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.swt.widgets.Item#setImage(org.eclipse.swt.graphics.Image)
	 */
	public void setImage(Image image) {
		super.setImage(image);
		if (nodeFigure != null) {
			updateFigureForModel(nodeFigure);
		}
	}

	/**
	 * Gets the graphModel that this node is contained in
	 * 
	 * @return The graph model that this node is contained in
	 */
	public Graph getGraphModel() {
		return this.graph;
	}

	/**
	 * @return the nodeStyle
	 */
	public int getNodeStyle() {
		return nodeStyle;
	}

	/**
	 * @param nodeStyle
	 *            the nodeStyle to set
	 */
	public void setNodeStyle(int nodeStyle) {
		this.nodeStyle = nodeStyle;
		this.cacheLabel = ((this.nodeStyle & ZestStyles.NODES_CACHE_LABEL) > 0) ? true : false;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.mylar.zest.core.internal.graphmodel.IGraphModelNode#setSize(double,
	 *      double)
	 */
	public void setSize(double width, double height) {
		if ((width != size.width) || (height != size.height)) {
			size.width = (int) width;
			size.height = (int) height;
			refreshLocation();
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.mylar.zest.core.internal.graphmodel.IGraphModelNode#getBorderHighlightColor()
	 */
	public Color getBorderHighlightColor() {
		return borderHighlightColor;
	}

	public boolean cacheLabel() {
		return this.cacheLabel;
	}

	public void setCacheLabel(boolean cacheLabel) {
		this.cacheLabel = cacheLabel;
	}

	public IFigure getNodeFigure() {
		return this.nodeFigure;
	}

	public void setVisible(boolean visible) {
		// graph.addRemoveFigure(this, visible);
		this.visible = visible;
		this.getFigure().setVisible(visible);
		List sConnections = (this).getSourceConnections();
		List tConnections = (this).getTargetConnections();
		for (Iterator iterator2 = sConnections.iterator(); iterator2.hasNext();) {
			GraphConnection connection = (GraphConnection) iterator2.next();
			connection.setVisible(visible);
		}

		for (Iterator iterator2 = tConnections.iterator(); iterator2.hasNext();) {
			GraphConnection connection = (GraphConnection) iterator2.next();
			connection.setVisible(visible);
		}
	}

	public int getStyle() {
		return super.getStyle() | this.getNodeStyle();
	}

	/***************************************************************************
	 * PRIVATE MEMBERS
	 **************************************************************************/

	private IFigure fishEyeFigure = null;
	private Font fishEyeFont = null;
	private boolean isFisheyeEnabled;

	protected IFigure fishEye(boolean enable, boolean animate) {
		if (isDisposed) {
			// If a fisheyed figure is still left on the canvas, we could get
			// called once more after the dispose is called.  Since we cleaned
			// up everything on dispose, we can just return null here.
			return null;
		}
		if (!checkStyle(ZestStyles.NODES_FISHEYE)) {
			return null;
		}
		if (enable) {
			// Create the fish eye label
			fishEyeFigure = createFishEyeFigure();

			// Get the current Bounds
			Rectangle rectangle = nodeFigure.getBounds().getCopy();

			FontData fontData = Display.getCurrent().getSystemFont().getFontData()[0];
			fontData.setHeight(12);
			fishEyeFont = new Font(Display.getCurrent(), fontData);
			fishEyeFigure.setFont(fishEyeFont);

			// Calculate how much we have to expand the current bounds to get to the new bounds
			Dimension newSize = fishEyeFigure.getPreferredSize();
			Rectangle currentSize = rectangle.getCopy();
			nodeFigure.translateToAbsolute(currentSize);
			int expandedH = (newSize.height - currentSize.height) / 2 + 1;
			int expandedW = (newSize.width - currentSize.width) / 2 + 1;
			Dimension expandAmount = new Dimension(expandedW, expandedH);
			nodeFigure.translateToAbsolute(rectangle);
			rectangle.expand(new Insets(expandAmount.height, expandAmount.width, expandAmount.height, expandAmount.width));
			if (expandedH <= 0 && expandedW <= 0) {
				return null;
			}

			//Add the fisheye
			this.getGraphModel().fishEye(nodeFigure, fishEyeFigure, rectangle, true);
			if (fishEyeFigure != null) {
				isFisheyeEnabled = true;
			}
			return fishEyeFigure;

		} else {
			// Remove the fisheye and dispose the font
			this.getGraphModel().removeFishEye(fishEyeFigure, nodeFigure, animate);
			if (fishEyeFont != null) {
				this.fishEyeFont.dispose();
				this.fishEyeFont = null;
			}
			isFisheyeEnabled = false;
			return null;
		}
	}

	IContainer getParent() {
		return parent;
	}

	boolean isHighlighted() {
		return highlighted > 0;
	}

	void invokeLayoutListeners(LayoutConstraint constraint) {
		graph.invokeConstraintAdapters(this, constraint);
	}

	protected void updateFigureForModel(IFigure currentFigure) {
		if (currentFigure == null) {
			return;
		}

		if (!(currentFigure instanceof GraphLabel)) {
			return;
		}
		GraphLabel figure = (GraphLabel) currentFigure;
		IFigure toolTip;

		if (!checkStyle(ZestStyles.NODES_HIDE_TEXT)) {
			figure.setText(this.getText());
		}
		figure.setIcon(getImage());

		if (highlighted == HIGHLIGHT_ON) {
			figure.setForegroundColor(getForegroundColor());
			figure.setBackgroundColor(getHighlightColor());
			figure.setBorderColor(getBorderHighlightColor());
		} else {
			figure.setForegroundColor(getForegroundColor());
			figure.setBackgroundColor(getBackgroundColor());
			figure.setBorderColor(getBorderColor());
		}

		figure.setBorderWidth(getBorderWidth());

		figure.setFont(getFont());

		if (this.getTooltip() == null && hasCustomTooltip == false) {
			// if we have a custom tooltip, don't try and create our own.
			toolTip = new Label();
			((Label) toolTip).setText(getText());
		} else {
			toolTip = this.getTooltip();
		}
		figure.setToolTip(toolTip);

		refreshLocation();

		if (isFisheyeEnabled) {
			IFigure newFisheyeFigure = createFishEyeFigure();
			if (graph.replaceFishFigure(this.fishEyeFigure, newFisheyeFigure)) {
				this.fishEyeFigure = newFisheyeFigure;
			}
		}
	}

	protected IFigure createFigureForModel() {
		GraphNode node = this;
		boolean cacheLabel = (this).cacheLabel();
		GraphLabel label = new GraphLabel(node.getText(), node.getImage(), cacheLabel);
		label.setFont(this.font);
		if (checkStyle(ZestStyles.NODES_HIDE_TEXT)) {
			label.setText("");
		}
		updateFigureForModel(label);
		return label;
	}

	private IFigure createFishEyeFigure() {
		GraphNode node = this;
		boolean cacheLabel = this.cacheLabel();
		GraphLabel label = new GraphLabel(node.getText(), node.getImage(), cacheLabel);

		if (!checkStyle(ZestStyles.NODES_HIDE_TEXT)) {
			label.setText(this.getText());
		}
		label.setIcon(getImage());

		// @tag TODO: Add border and foreground colours to highlight
		// (this.borderColor)
		if (highlighted == HIGHLIGHT_ON) {
			label.setForegroundColor(getForegroundColor());
			label.setBackgroundColor(getHighlightColor());
		} else {
			label.setForegroundColor(getForegroundColor());
			label.setBackgroundColor(getBackgroundColor());
		}

		label.setFont(getFont());
		return label;
	}

	public boolean isVisible() {
		return visible;
	}

	void addSourceConnection(GraphConnection connection) {
		this.sourceConnections.add(connection);
	}

	void addTargetConnection(GraphConnection connection) {
		this.targetConnections.add(connection);
	}

	void removeSourceConnection(GraphConnection connection) {
		this.sourceConnections.remove(connection);
	}

	void removeTargetConnection(GraphConnection connection) {
		this.targetConnections.remove(connection);
	}

	/**
	 * Sets the node as selected.
	 */
	void setSelected(boolean selected) {
		if (selected == isSelected()) {
			return;
		}
		if (selected) {
			highlight();
		} else {
			unhighlight();
		}
		this.selected = selected;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.mylar.zest.core.widgets.IGraphItem#getItemType()
	 */
	public int getItemType() {
		return NODE;
	}

	class LayoutGraphNode implements LayoutEntity {
		Object layoutInformation = null;

		public double getHeightInLayout() {
			return getSize().height;
		}

		public Object getLayoutInformation() {
			return layoutInformation;
		}

		public String toString() {
			return getText();
		}

		public double getWidthInLayout() {
			return getSize().width;
		}

		public double getXInLayout() {
			return getLocation().x;
		}

		public double getYInLayout() {
			return getLocation().y;
		}

		public void populateLayoutConstraint(LayoutConstraint constraint) {
			invokeLayoutListeners(constraint);
		}

		public void setLayoutInformation(Object internalEntity) {
			this.layoutInformation = internalEntity;

		}

		public void setLocationInLayout(double x, double y) {
			setLocation(x, y);
		}

		public void setSizeInLayout(double width, double height) {
			setSize(width, height);
		}

		/**
		 * Compares two nodes.
		 */
		public int compareTo(Object otherNode) {
			int rv = 0;
			if (otherNode instanceof GraphNode) {
				GraphNode node = (GraphNode) otherNode;
				if (getText() != null) {
					rv = getText().compareTo(node.getText());
				}
			}
			return rv;
		}

		public Object getGraphData() {
			return GraphNode.this;
		}

		public void setGraphData(Object o) {
			// TODO Auto-generated method stub

		}

	}

	IFigure getFigure() {
		if (this.nodeFigure == null) {
			initFigure();
		}
		return this.getNodeFigure();
	}

	void paint() {

	}
}