Using Zest and GEF within an Eclipse RCP view

1. Create an RCP project (See how to create a RCP project)

2. Download GEF according to the version of your Eclipse (mine is 3.4) http://www.eclipse.org/gef/downloads/
3. From plugin.xml, go to Depedencies tab and add org.eclipse.zest.core, org.eclipse,gef, org.eclipse.zest.layouts to the Required Plug-ins section.
4. Create a view called "MyGraph"
--

package views;

import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.part.ViewPart;
import org.eclipse.zest.core.viewers.GraphViewer;
import org.eclipse.zest.core.viewers.IGraphContentProvider;
import org.eclipse.zest.core.widgets.Graph;
import org.eclipse.zest.core.widgets.GraphConnection;
import org.eclipse.zest.core.widgets.GraphNode;
import org.eclipse.zest.layouts.LayoutStyles;
import org.eclipse.zest.layouts.algorithms.SpringLayoutAlgorithm;

public class MyGraph extends ViewPart
{
public static final String ID = "MyGraph.Graph";

static class MyContentProvider implements IGraphContentProvider
{
private static final String edge3 = "edge3";
private static final String edge2 = "edge2";
private static final String edge1 = "edge1";

public Object getSource(Object rel)
{
if (edge1.equals(rel))
{
return "AAA";
}
else if (edge2.equals(rel))
{
return "BBB";
}
else if (edge3.equals(rel))
{
return "CCC";
}
return null;
}

public Object [] getElements(Object input)
{
return new Object[] { edge1, edge2, edge3 };
}

public Object getDestination(Object rel)
{
if (edge1.equals(rel))
{
return "BBB";
}
else if (edge2.equals(rel))
{
return "CCC";
}
else if (edge3.equals(rel))
{
return "AAA";
}
return null;
}

public double getWeight(Object connection)
{
return 0;
}

public void dispose()
{}

public void inputChanged(Viewer viewer, Object oldInput, Object newInput)
{}

}

static class MyLabelProvider extends LabelProvider
{
final Image image = Display.getDefault().getSystemImage(SWT.ICON_WARNING);

public Image getImage(Object element)
{
if (element.equals("BBB") || element.equals("AAA") || element.equals("CCC"))
{
return image;
}
return null;
}

public String getText(Object element)
{
return element.toString();
}
}

static GraphViewer viewer = null;

@Override
public void createPartControl(Composite parent)
{
Composite comp = new Composite(parent, SWT.NONE);
comp.setLayout(new FillLayout(SWT.VERTICAL));
comp.setSize(400, 400);

viewer = new GraphViewer(comp, SWT.NONE);
viewer.setContentProvider(new MyContentProvider());
viewer.setLabelProvider(new MyLabelProvider());
viewer.setLayoutAlgorithm(new SpringLayoutAlgorithm(LayoutStyles.NO_LAYOUT_NODE_RESIZING));
viewer.setInput(new Object());
}
@Override
public void setFocus()
{
}
}

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5. Make sure you add the view to your plugin.xml with the id "MyGraph.Graph". (See how to add a view to an RCP project)

6. Add this view to perspective. (See how to add a view to perspective)