plugins/org.eclipse.epsilon.dt.epackageregistryexplorer/src/org/eclipse/epsilon/dt/epackageregistryexplorer/PackageRegistryExplorerView.java - epsilon/org.eclipse.epsilon - Git at Google

 /*******************************************************************************
  * Copyright (c) 2008 The University of York.
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
  * which is available at https://www.eclipse.org/legal/epl-2.0/
  *
  * Contributors:
  *     Dimitrios Kolovos - initial API and implementation
 ******************************************************************************/

 package org.eclipse.epsilon.dt.epackageregistryexplorer;

 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;

 import org.eclipse.core.runtime.IAdaptable;
 import org.eclipse.emf.ecore.EObject;
 import org.eclipse.emf.ecore.EPackage;
 import org.eclipse.emf.ecore.EStructuralFeature;
 import org.eclipse.emf.ecore.ETypedElement;
 import org.eclipse.emf.edit.provider.ReflectiveItemProvider;
 import org.eclipse.emf.edit.provider.ReflectiveItemProviderAdapterFactory;
 import org.eclipse.emf.edit.ui.provider.PropertySource;
 import org.eclipse.jface.action.Action;
 import org.eclipse.jface.action.ToolBarManager;
 import org.eclipse.jface.viewers.DoubleClickEvent;
 import org.eclipse.jface.viewers.IDoubleClickListener;
 import org.eclipse.jface.viewers.ISelection;
 import org.eclipse.jface.viewers.ISelectionChangedListener;
 import org.eclipse.jface.viewers.ISelectionProvider;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.jface.viewers.SelectionChangedEvent;
 import org.eclipse.jface.viewers.StructuredSelection;
 import org.eclipse.jface.viewers.TreePath;
 import org.eclipse.jface.viewers.TreeSelection;
 import org.eclipse.jface.viewers.TreeViewer;
 import org.eclipse.jface.viewers.Viewer;
 import org.eclipse.jface.viewers.ViewerComparator;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.CLabel;
 import org.eclipse.swt.custom.SashForm;
 import org.eclipse.swt.custom.ViewForm;
 import org.eclipse.swt.layout.FillLayout;
 import org.eclipse.swt.layout.FormAttachment;
 import org.eclipse.swt.layout.FormData;
 import org.eclipse.swt.layout.FormLayout;
 import org.eclipse.swt.widgets.Button;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.swt.widgets.ToolBar;
 import org.eclipse.swt.widgets.TreeItem;
 import org.eclipse.ui.IActionBars;
 import org.eclipse.ui.IWorkbenchPage;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.part.ViewPart;
 import org.eclipse.ui.views.properties.IPropertySource;

 public class PackageRegistryExplorerView extends ViewPart implements ISelectionProvider{

 	public static final String ID = "org.eclipse.epsilon.dt.epackageregistryexplorer.PackageRegistryExplorerView";
 	protected Collection<ISelectionChangedListener> selectionChangedListeners = new ArrayList<ISelectionChangedListener>();
 	protected boolean backRunning = false;
 	protected TreeViewer classViewer;
 	protected ViewForm featureViewerForm;
 	protected TreeViewer featureViewer;
 	protected ArrayList<EPackage> ePackages = new ArrayList<EPackage>();
 	protected List<TreePath> history = new ArrayList<TreePath>();
 	protected CLabel selectedClassLabel = null;
 	protected boolean showInheritedFeatures = true;
 	protected boolean showDerivedFeatures = true;
 	protected boolean showOppositeReference = false;
 	protected boolean showOperations = false;

 	public boolean isShowOppositeReference() {
 		return showOppositeReference;
 	}

 	public void setShowOppositeReference(boolean showOppositeReference) {
 		this.showOppositeReference = showOppositeReference;
 		featureViewer.refresh();
 	}

 	public boolean isShowOperations() {
 		return showOperations;
 	}

 	public void setShowOperations(boolean showOperations) {
 		this.showOperations = showOperations;
 		featureViewer.refresh();
 	}

 	public boolean isShowInheritedFeatures() {
 		return showInheritedFeatures;
 	}

 	public void setShowInheritedFeatures(boolean showInheritedFeatures) {
 		this.showInheritedFeatures = showInheritedFeatures;
 		featureViewer.refresh();
 	}

 	public boolean isShowDerivedFeatures() {
 		return showDerivedFeatures;
 	}

 	public void setShowDerivedFeatures(boolean showDerivedFeatures) {
 		this.showDerivedFeatures = showDerivedFeatures;
 		featureViewer.refresh();
 	}

 	public List<EPackage> getEPackages() {
 		return ePackages;
 	}

 	@Override
 	public void createPartControl(Composite parent) {


 		EcoreLabelProvider ecoreLabelProvider = new EcoreLabelProvider(this);

 		SashForm sashForm = new SashForm(parent, SWT.VERTICAL);

 		classViewer = new TreeViewer(sashForm, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL);
 		classViewer.setContentProvider(new PackageRegistryContentProvider(this));
 		classViewer.setLabelProvider(ecoreLabelProvider);
 		classViewer.addSelectionChangedListener(new ClassViewerSelectionChangedListener());
 		classViewer.setComparator(new ViewerComparator((o1, o2) -> o1.compareTo(o2)));
 		classViewer.setInput(getViewSite());
 		getSite().setSelectionProvider(this);

 		classViewer.addSelectionChangedListener(new ISelectionChangedListener() {

 			public void selectionChanged(SelectionChangedEvent event) {

 				if (backRunning) return;


 				TreeSelection selection = (TreeSelection) event.getSelection();

 				if (selection.getPaths().length == 0) return;

 				if (history.size() == 0) {
 					history.add(0, selection.getPaths()[0]);
 				}
 				else if (history.get(0) != selection.getPaths()[0]) {
 					history.add(0, selection.getPaths()[0]);
 				}
 			}

 		});

 		//Composite composite = new Composite(sashForm, SWT.NONE);

 		//composite.setLayout(new FormLayout());
 		//ToolBar t = new ToolBar(composite, SWT.NONE);
 		//ToolBarManager m = new ToolBarManager(t);
 		//m.add(new RefreshAction());

 		featureViewerForm = new ViewForm(sashForm, SWT.NONE);

 		featureViewer = new TreeViewer(featureViewerForm, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL);
 		featureViewerForm.setContent(featureViewer.getControl());
 		featureViewer.setContentProvider(new FeatureViewerContentProvider(this));
 		featureViewer.setLabelProvider(ecoreLabelProvider);
 		featureViewer.setComparator(new ViewerComparator((o1, o2) -> o1.compareTo(o2)));
 		featureViewer.setInput(null);
 		featureViewer.addDoubleClickListener(new IDoubleClickListener() {

 			public void doubleClick(DoubleClickEvent event) {
 				IStructuredSelection s = (IStructuredSelection) event.getSelection();
 				if (s.getFirstElement() != null) {
 					if (s.getFirstElement() instanceof ETypedElement) {
 						ETypedElement f = (ETypedElement) s.getFirstElement();
 						classViewer.setSelection(new TreeSelection(new TreePath(new Object[]{f.getEType().getEPackage(), f.getEType()})));
 					}
 					else if (s.getFirstElement() instanceof DecoratorHookDescriptor) {
 						EStructuralFeature f = ((DecoratorHookDescriptor) s.getFirstElement()).getEStructuralFeature();
 						classViewer.setSelection(new TreeSelection(new TreePath(new Object[]{f.getEContainingClass().getEPackage(), f.getEContainingClass()})));
 					}
 				}
 			}

 		});

 		featureViewer.addSelectionChangedListener(new ISelectionChangedListener() {

 			public void selectionChanged(SelectionChangedEvent event) {
 				notifySelectionChangedListeners(featureViewer);
 			}

 		});

 		selectedClassLabel = new CLabel(featureViewerForm, SWT.NONE);
 		featureViewerForm.setTopLeft(selectedClassLabel);

 		ToolBar featureViewerToolBar= new ToolBar(featureViewerForm, SWT.FLAT | SWT.WRAP);
 		featureViewerForm.setTopCenter(featureViewerToolBar);
 		ToolBarManager manager = new ToolBarManager(featureViewerToolBar);
 		manager.add(new ShowOperationsAction(this));
 		manager.add(new ShowOppositeReferenceAction(this));
 		manager.add(new ShowDerivedFeaturesAction(this));
 		manager.add(new ShowInheritedFeaturesAction(this));
 		manager.update(true);

 		//layout(parent);
 		contributeToActionBars();
 	}


 	private void contributeToActionBars() {
 		IActionBars bars = getViewSite().getActionBars();
 		bars.getToolBarManager().add(new BackAction());
 		bars.getToolBarManager().add(new RefreshAction());
 		bars.getToolBarManager().add(new NewViewInstanceAction());
 	}

 	class ClassViewerSelectionChangedListener implements ISelectionChangedListener {

 		public void selectionChanged(SelectionChangedEvent event) {
 			IStructuredSelection selection = (IStructuredSelection) event.getSelection();
 			TreeItem[] selectedItems = classViewer.getTree().getSelection();
 			if (selectedItems.length > 0) {
 				selectedClassLabel.setText(selectedItems[0].getText());
 				selectedClassLabel.setImage(selectedItems[0].getImage());
 				notifySelectionChangedListeners(classViewer);
 			}
 			featureViewer.setInput(selection.getFirstElement());
 		}

 	}

 	class NewViewInstanceAction extends Action {

 		protected boolean running = false;

 		public NewViewInstanceAction() {
 			this.setText("New EPackage Registry View");
 			this.setImageDescriptor(Activator.getDefault().getImageDescriptor("icons/newviewinstance.png"));
 		}

 		@Override
 		public void run() {

 			IWorkbenchPage activePage = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
 			try {
 				activePage.showView(PackageRegistryExplorerView.ID, Math.random()*1000 +"", IWorkbenchPage.VIEW_ACTIVATE);
 			}
 			catch (Exception ex) {
 				ex.printStackTrace();
 			}
 		}

 	}

 	class BackAction extends Action {

 		protected boolean running = false;

 		public BackAction() {
 			this.setText("Back");
 			this.setImageDescriptor(Activator.getDefault().getImageDescriptor("icons/back.png"));
 		}

 		@Override
 		public void run() {

 			backRunning = true;

 			if (history.size() > 1) {
 				classViewer.setSelection(new TreeSelection(history.get(1)));
 				history.remove(1);
 			}

 			backRunning = false;
 		}
 	}

 	class RefreshAction extends Action {

 		public RefreshAction() {
 			this.setText("Refresh");
 			this.setImageDescriptor(Activator.getDefault().getImageDescriptor("icons/refresh.gif"));
 		}

 		@Override
 		public void run() {
 			ArrayList<EPackage> ePackages = new ArrayList<EPackage>();

 			//Avoid concurrent modification exceptions that can happen when iterating
 			//directly over INSTANCE.values()
 			ArrayList<Object> ePackageRegistryValues = new ArrayList<Object>();
 			ePackageRegistryValues.addAll(EPackage.Registry.INSTANCE.values());

 			for (Object o : ePackageRegistryValues) {
 				if (o instanceof EPackage) {
 					ePackages.add((EPackage)o);
 				}
 				else if (o instanceof EPackage.Descriptor) {
 					try {
 						ePackages.add(((EPackage.Descriptor) o).getEPackage());
 					}
 					catch (Exception ex) {
 						// Problematic package descriptor - ignore
 					}
 				}
 			}
 			PackageRegistryExplorerView.this.ePackages = ePackages;
 			classViewer.refresh();
 		}
 	}

 	public static void main(String[] args) {


 		    final Display display = new Display();
 		    Shell shell = new Shell(display);
 		    shell.setLayout(new FillLayout());

 		    SashForm form = new SashForm(shell, SWT.VERTICAL);
 		    form.setLayout(new FillLayout());

 		    Composite child1 = new Composite(form, SWT.NONE);
 		    child1.setLayout(new FillLayout());
 		    new Label(child1, SWT.NONE).setText("Label in pane 1");

 		    Composite child2 = new Composite(form, SWT.NONE);
 		    child2.setLayout(new FillLayout());
 		    new Button(child2, SWT.PUSH).setText("Button in pane2");

 		    Composite child3 = new Composite(form, SWT.NONE);
 		    child3.setLayout(new FillLayout());
 		    new Label(child3, SWT.PUSH).setText("Label in pane3");

 		    form.setWeights(new int[] { 30, 40, 30 });
 		    shell.open();
 		    while (!shell.isDisposed()) {
 		      if (!display.readAndDispatch())
 		        display.sleep();
 		    }
 		    display.dispose();


 	}

 	protected void layout(final Composite parent) {
 		final SashForm sash = new SashForm(parent, SWT.HORIZONTAL);
 	    final FormLayout form = new FormLayout();
 	    parent.setLayout(form);

 	    FormData button1Data = new FormData();
 	    button1Data.left = new FormAttachment(0, 0);
 	    button1Data.right = new FormAttachment(sash, 0);
 	    button1Data.top = new FormAttachment(0, 0);
 	    button1Data.bottom = new FormAttachment(100, 0);
 	    classViewer.getControl().setLayoutData(button1Data);

 	    int percent = 50;
 	    final FormData sashData = new FormData();
 	    sashData.left = new FormAttachment(percent, 0);
 	    sashData.top = new FormAttachment(0, 0);
 	    sashData.bottom = new FormAttachment(100, 0);
 	    sash.setLayoutData(sashData);
 	    /*
 	    sash.addListener(SWT.Selection, new Listener() {
 	      public void handleEvent(Event e) {
 	        Rectangle sashRect = sash.getBounds();
 	        Rectangle shellRect = parent.getClientArea();
 	        int right = shellRect.width - sashRect.width - limit;
 	        e.x = Math.max(Math.min(e.x, right), limit);
 	        if (e.x != sashRect.x) {
 	          sashData.left = new FormAttachment(0, e.x);
 	          parent.layout();
 	        }
 	      }
 	    });
 */
 	    FormData button2Data = new FormData();
 	    button2Data.left = new FormAttachment(sash, 0);
 	    button2Data.right = new FormAttachment(100, 0);
 	    button2Data.top = new FormAttachment(0, 0);
 	    button2Data.bottom = new FormAttachment(100, 0);
 	    featureViewer.getControl().setLayoutData(button2Data);

 	}

 	@Override
 	public void setFocus() {

 	}

 	public void addSelectionChangedListener(ISelectionChangedListener listener) {
 		selectionChangedListeners.add(listener);
 	}

 	public ISelection getSelection() {
 		return null;
 	}

 	public void notifySelectionChangedListeners(Viewer viewer) {
 		for (ISelectionChangedListener listener : selectionChangedListeners) {
 			final Object selected = ((IStructuredSelection)viewer.getSelection()).getFirstElement();

 			IAdaptable adaptable = new IAdaptable() {

 				@SuppressWarnings("rawtypes")
 				public Object getAdapter(Class adapter) {

 					if (selected instanceof EObject && adapter == IPropertySource.class) {

 						return new PropertySource(selected, new ReflectiveItemProvider(new ReflectiveItemProviderAdapterFactory()));
 					}
 					return null;
 				}

 			};
 			listener.selectionChanged(new SelectionChangedEvent(this, new StructuredSelection(adaptable)));
 		}
 	}

 	public void removeSelectionChangedListener(
 			ISelectionChangedListener listener) {
 		selectionChangedListeners.remove(listener);

 	}

 	public void setSelection(ISelection selection) {
 		// TODO Auto-generated method stub

 	}

 }
	/*******************************************************************************
	* Copyright (c) 2008 The University of York.
	* This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License 2.0
	* which is available at https://www.eclipse.org/legal/epl-2.0/
	*
	* Contributors:
	* Dimitrios Kolovos - initial API and implementation
	******************************************************************************/

	package org.eclipse.epsilon.dt.epackageregistryexplorer;

	import java.util.ArrayList;
	import java.util.Collection;
	import java.util.List;

	import org.eclipse.core.runtime.IAdaptable;
	import org.eclipse.emf.ecore.EObject;
	import org.eclipse.emf.ecore.EPackage;
	import org.eclipse.emf.ecore.EStructuralFeature;
	import org.eclipse.emf.ecore.ETypedElement;
	import org.eclipse.emf.edit.provider.ReflectiveItemProvider;
	import org.eclipse.emf.edit.provider.ReflectiveItemProviderAdapterFactory;
	import org.eclipse.emf.edit.ui.provider.PropertySource;
	import org.eclipse.jface.action.Action;
	import org.eclipse.jface.action.ToolBarManager;
	import org.eclipse.jface.viewers.DoubleClickEvent;
	import org.eclipse.jface.viewers.IDoubleClickListener;
	import org.eclipse.jface.viewers.ISelection;
	import org.eclipse.jface.viewers.ISelectionChangedListener;
	import org.eclipse.jface.viewers.ISelectionProvider;
	import org.eclipse.jface.viewers.IStructuredSelection;
	import org.eclipse.jface.viewers.SelectionChangedEvent;
	import org.eclipse.jface.viewers.StructuredSelection;
	import org.eclipse.jface.viewers.TreePath;
	import org.eclipse.jface.viewers.TreeSelection;
	import org.eclipse.jface.viewers.TreeViewer;
	import org.eclipse.jface.viewers.Viewer;
	import org.eclipse.jface.viewers.ViewerComparator;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.custom.CLabel;
	import org.eclipse.swt.custom.SashForm;
	import org.eclipse.swt.custom.ViewForm;
	import org.eclipse.swt.layout.FillLayout;
	import org.eclipse.swt.layout.FormAttachment;
	import org.eclipse.swt.layout.FormData;
	import org.eclipse.swt.layout.FormLayout;
	import org.eclipse.swt.widgets.Button;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Display;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Shell;
	import org.eclipse.swt.widgets.ToolBar;
	import org.eclipse.swt.widgets.TreeItem;
	import org.eclipse.ui.IActionBars;
	import org.eclipse.ui.IWorkbenchPage;
	import org.eclipse.ui.PlatformUI;
	import org.eclipse.ui.part.ViewPart;
	import org.eclipse.ui.views.properties.IPropertySource;

	public class PackageRegistryExplorerView extends ViewPart implements ISelectionProvider{

	public static final String ID = "org.eclipse.epsilon.dt.epackageregistryexplorer.PackageRegistryExplorerView";
	protected Collection<ISelectionChangedListener> selectionChangedListeners = new ArrayList<ISelectionChangedListener>();
	protected boolean backRunning = false;
	protected TreeViewer classViewer;
	protected ViewForm featureViewerForm;
	protected TreeViewer featureViewer;
	protected ArrayList<EPackage> ePackages = new ArrayList<EPackage>();
	protected List<TreePath> history = new ArrayList<TreePath>();
	protected CLabel selectedClassLabel = null;
	protected boolean showInheritedFeatures = true;
	protected boolean showDerivedFeatures = true;
	protected boolean showOppositeReference = false;
	protected boolean showOperations = false;

	public boolean isShowOppositeReference() {
	return showOppositeReference;
	}

	public void setShowOppositeReference(boolean showOppositeReference) {
	this.showOppositeReference = showOppositeReference;
	featureViewer.refresh();
	}

	public boolean isShowOperations() {
	return showOperations;
	}

	public void setShowOperations(boolean showOperations) {
	this.showOperations = showOperations;
	featureViewer.refresh();
	}

	public boolean isShowInheritedFeatures() {
	return showInheritedFeatures;
	}

	public void setShowInheritedFeatures(boolean showInheritedFeatures) {
	this.showInheritedFeatures = showInheritedFeatures;
	featureViewer.refresh();
	}

	public boolean isShowDerivedFeatures() {
	return showDerivedFeatures;
	}

	public void setShowDerivedFeatures(boolean showDerivedFeatures) {
	this.showDerivedFeatures = showDerivedFeatures;
	featureViewer.refresh();
	}

	public List<EPackage> getEPackages() {
	return ePackages;
	}

	@Override
	public void createPartControl(Composite parent) {


	EcoreLabelProvider ecoreLabelProvider = new EcoreLabelProvider(this);

	SashForm sashForm = new SashForm(parent, SWT.VERTICAL);

	classViewer = new TreeViewer(sashForm, SWT.MULTI \| SWT.H_SCROLL \| SWT.V_SCROLL);
	classViewer.setContentProvider(new PackageRegistryContentProvider(this));
	classViewer.setLabelProvider(ecoreLabelProvider);
	classViewer.addSelectionChangedListener(new ClassViewerSelectionChangedListener());
	classViewer.setComparator(new ViewerComparator((o1, o2) -> o1.compareTo(o2)));
	classViewer.setInput(getViewSite());
	getSite().setSelectionProvider(this);

	classViewer.addSelectionChangedListener(new ISelectionChangedListener() {

	public void selectionChanged(SelectionChangedEvent event) {

	if (backRunning) return;



	TreeSelection selection = (TreeSelection) event.getSelection();

	if (selection.getPaths().length == 0) return;

	if (history.size() == 0) {
	history.add(0, selection.getPaths()[0]);
	}
	else if (history.get(0) != selection.getPaths()[0]) {
	history.add(0, selection.getPaths()[0]);
	}
	}

	});

	//Composite composite = new Composite(sashForm, SWT.NONE);

	//composite.setLayout(new FormLayout());
	//ToolBar t = new ToolBar(composite, SWT.NONE);
	//ToolBarManager m = new ToolBarManager(t);
	//m.add(new RefreshAction());

	featureViewerForm = new ViewForm(sashForm, SWT.NONE);

	featureViewer = new TreeViewer(featureViewerForm, SWT.MULTI \| SWT.H_SCROLL \| SWT.V_SCROLL);
	featureViewerForm.setContent(featureViewer.getControl());
	featureViewer.setContentProvider(new FeatureViewerContentProvider(this));
	featureViewer.setLabelProvider(ecoreLabelProvider);
	featureViewer.setComparator(new ViewerComparator((o1, o2) -> o1.compareTo(o2)));
	featureViewer.setInput(null);
	featureViewer.addDoubleClickListener(new IDoubleClickListener() {

	public void doubleClick(DoubleClickEvent event) {
	IStructuredSelection s = (IStructuredSelection) event.getSelection();
	if (s.getFirstElement() != null) {
	if (s.getFirstElement() instanceof ETypedElement) {
	ETypedElement f = (ETypedElement) s.getFirstElement();
	classViewer.setSelection(new TreeSelection(new TreePath(new Object[]{f.getEType().getEPackage(), f.getEType()})));
	}
	else if (s.getFirstElement() instanceof DecoratorHookDescriptor) {
	EStructuralFeature f = ((DecoratorHookDescriptor) s.getFirstElement()).getEStructuralFeature();
	classViewer.setSelection(new TreeSelection(new TreePath(new Object[]{f.getEContainingClass().getEPackage(), f.getEContainingClass()})));
	}
	}
	}

	});

	featureViewer.addSelectionChangedListener(new ISelectionChangedListener() {

	public void selectionChanged(SelectionChangedEvent event) {
	notifySelectionChangedListeners(featureViewer);
	}

	});

	selectedClassLabel = new CLabel(featureViewerForm, SWT.NONE);
	featureViewerForm.setTopLeft(selectedClassLabel);

	ToolBar featureViewerToolBar= new ToolBar(featureViewerForm, SWT.FLAT \| SWT.WRAP);
	featureViewerForm.setTopCenter(featureViewerToolBar);
	ToolBarManager manager = new ToolBarManager(featureViewerToolBar);
	manager.add(new ShowOperationsAction(this));
	manager.add(new ShowOppositeReferenceAction(this));
	manager.add(new ShowDerivedFeaturesAction(this));
	manager.add(new ShowInheritedFeaturesAction(this));
	manager.update(true);

	//layout(parent);
	contributeToActionBars();
	}


	private void contributeToActionBars() {
	IActionBars bars = getViewSite().getActionBars();
	bars.getToolBarManager().add(new BackAction());
	bars.getToolBarManager().add(new RefreshAction());
	bars.getToolBarManager().add(new NewViewInstanceAction());
	}

	class ClassViewerSelectionChangedListener implements ISelectionChangedListener {

	public void selectionChanged(SelectionChangedEvent event) {
	IStructuredSelection selection = (IStructuredSelection) event.getSelection();
	TreeItem[] selectedItems = classViewer.getTree().getSelection();
	if (selectedItems.length > 0) {
	selectedClassLabel.setText(selectedItems[0].getText());
	selectedClassLabel.setImage(selectedItems[0].getImage());
	notifySelectionChangedListeners(classViewer);
	}
	featureViewer.setInput(selection.getFirstElement());
	}

	}

	class NewViewInstanceAction extends Action {

	protected boolean running = false;

	public NewViewInstanceAction() {
	this.setText("New EPackage Registry View");
	this.setImageDescriptor(Activator.getDefault().getImageDescriptor("icons/newviewinstance.png"));
	}

	@Override
	public void run() {

	IWorkbenchPage activePage = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
	try {
	activePage.showView(PackageRegistryExplorerView.ID, Math.random()*1000 +"", IWorkbenchPage.VIEW_ACTIVATE);
	}
	catch (Exception ex) {
	ex.printStackTrace();
	}
	}

	}

	class BackAction extends Action {

	protected boolean running = false;

	public BackAction() {
	this.setText("Back");
	this.setImageDescriptor(Activator.getDefault().getImageDescriptor("icons/back.png"));
	}

	@Override
	public void run() {

	backRunning = true;

	if (history.size() > 1) {
	classViewer.setSelection(new TreeSelection(history.get(1)));
	history.remove(1);
	}

	backRunning = false;
	}
	}

	class RefreshAction extends Action {

	public RefreshAction() {
	this.setText("Refresh");
	this.setImageDescriptor(Activator.getDefault().getImageDescriptor("icons/refresh.gif"));
	}

	@Override
	public void run() {
	ArrayList<EPackage> ePackages = new ArrayList<EPackage>();

	//Avoid concurrent modification exceptions that can happen when iterating
	//directly over INSTANCE.values()
	ArrayList<Object> ePackageRegistryValues = new ArrayList<Object>();
	ePackageRegistryValues.addAll(EPackage.Registry.INSTANCE.values());

	for (Object o : ePackageRegistryValues) {
	if (o instanceof EPackage) {
	ePackages.add((EPackage)o);
	}
	else if (o instanceof EPackage.Descriptor) {
	try {
	ePackages.add(((EPackage.Descriptor) o).getEPackage());
	}
	catch (Exception ex) {
	// Problematic package descriptor - ignore
	}
	}
	}
	PackageRegistryExplorerView.this.ePackages = ePackages;
	classViewer.refresh();
	}
	}

	public static void main(String[] args) {


	final Display display = new Display();
	Shell shell = new Shell(display);
	shell.setLayout(new FillLayout());

	SashForm form = new SashForm(shell, SWT.VERTICAL);
	form.setLayout(new FillLayout());

	Composite child1 = new Composite(form, SWT.NONE);
	child1.setLayout(new FillLayout());
	new Label(child1, SWT.NONE).setText("Label in pane 1");

	Composite child2 = new Composite(form, SWT.NONE);
	child2.setLayout(new FillLayout());
	new Button(child2, SWT.PUSH).setText("Button in pane2");

	Composite child3 = new Composite(form, SWT.NONE);
	child3.setLayout(new FillLayout());
	new Label(child3, SWT.PUSH).setText("Label in pane3");

	form.setWeights(new int[] { 30, 40, 30 });
	shell.open();
	while (!shell.isDisposed()) {
	if (!display.readAndDispatch())
	display.sleep();
	}
	display.dispose();



	}

	protected void layout(final Composite parent) {
	final SashForm sash = new SashForm(parent, SWT.HORIZONTAL);
	final FormLayout form = new FormLayout();
	parent.setLayout(form);

	FormData button1Data = new FormData();
	button1Data.left = new FormAttachment(0, 0);
	button1Data.right = new FormAttachment(sash, 0);
	button1Data.top = new FormAttachment(0, 0);
	button1Data.bottom = new FormAttachment(100, 0);
	classViewer.getControl().setLayoutData(button1Data);

	int percent = 50;
	final FormData sashData = new FormData();
	sashData.left = new FormAttachment(percent, 0);
	sashData.top = new FormAttachment(0, 0);
	sashData.bottom = new FormAttachment(100, 0);
	sash.setLayoutData(sashData);
	/*
	sash.addListener(SWT.Selection, new Listener() {
	public void handleEvent(Event e) {
	Rectangle sashRect = sash.getBounds();
	Rectangle shellRect = parent.getClientArea();
	int right = shellRect.width - sashRect.width - limit;
	e.x = Math.max(Math.min(e.x, right), limit);
	if (e.x != sashRect.x) {
	sashData.left = new FormAttachment(0, e.x);
	parent.layout();
	}
	}
	});
	*/
	FormData button2Data = new FormData();
	button2Data.left = new FormAttachment(sash, 0);
	button2Data.right = new FormAttachment(100, 0);
	button2Data.top = new FormAttachment(0, 0);
	button2Data.bottom = new FormAttachment(100, 0);
	featureViewer.getControl().setLayoutData(button2Data);

	}

	@Override
	public void setFocus() {

	}

	public void addSelectionChangedListener(ISelectionChangedListener listener) {
	selectionChangedListeners.add(listener);
	}

	public ISelection getSelection() {
	return null;
	}

	public void notifySelectionChangedListeners(Viewer viewer) {
	for (ISelectionChangedListener listener : selectionChangedListeners) {
	final Object selected = ((IStructuredSelection)viewer.getSelection()).getFirstElement();

	IAdaptable adaptable = new IAdaptable() {

	@SuppressWarnings("rawtypes")
	public Object getAdapter(Class adapter) {

	if (selected instanceof EObject && adapter == IPropertySource.class) {

	return new PropertySource(selected, new ReflectiveItemProvider(new ReflectiveItemProviderAdapterFactory()));
	}
	return null;
	}

	};
	listener.selectionChanged(new SelectionChangedEvent(this, new StructuredSelection(adaptable)));
	}
	}

	public void removeSelectionChangedListener(
	ISelectionChangedListener listener) {
	selectionChangedListeners.remove(listener);

	}

	public void setSelection(ISelection selection) {
	// TODO Auto-generated method stub

	}

	}