bundles/org.eclipse.emf.ecp.ui.view.editor.controls/src/org/eclipse/emf/ecp/view/internal/editor/controls/DomainModelReferenceControlSWTRenderer.java - emfclient/org.eclipse.emf.ecp.core - Git at Google

 /*******************************************************************************
  * Copyright (c) 2011-2014 EclipseSource Muenchen GmbH and others.
  *
  * 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:
  * Alexandra Buzila - initial API and implementation
  ******************************************************************************/
 package org.eclipse.emf.ecp.view.internal.editor.controls;

 import java.util.Collection;
 import java.util.HashSet;

 import org.eclipse.core.databinding.Binding;
 import org.eclipse.core.databinding.DataBindingContext;
 import org.eclipse.core.databinding.UpdateValueStrategy;
 import org.eclipse.core.databinding.observable.IObserving;
 import org.eclipse.core.databinding.observable.value.IObservableValue;
 import org.eclipse.emf.common.command.Command;
 import org.eclipse.emf.common.notify.AdapterFactory;
 import org.eclipse.emf.common.notify.Notification;
 import org.eclipse.emf.ecore.EClass;
 import org.eclipse.emf.ecore.EObject;
 import org.eclipse.emf.ecore.EPackage;
 import org.eclipse.emf.ecore.EReference;
 import org.eclipse.emf.ecore.EStructuralFeature;
 import org.eclipse.emf.ecore.impl.EReferenceImpl;
 import org.eclipse.emf.ecp.core.util.ECPUtil;
 import org.eclipse.emf.ecp.edit.internal.swt.SWTImageHelper;
 import org.eclipse.emf.ecp.edit.spi.swt.reference.DeleteReferenceAction;
 import org.eclipse.emf.ecp.edit.spi.swt.reference.NewReferenceAction;
 import org.eclipse.emf.ecp.edit.spi.util.ECPModelElementChangeListener;
 import org.eclipse.emf.ecp.internal.ui.Messages;
 import org.eclipse.emf.ecp.spi.common.ui.CompositeFactory;
 import org.eclipse.emf.ecp.spi.common.ui.composites.SelectionComposite;
 import org.eclipse.emf.ecp.view.internal.editor.handler.CreateDomainModelReferenceWizard;
 import org.eclipse.emf.ecp.view.spi.context.ViewModelContext;
 import org.eclipse.emf.ecp.view.spi.core.swt.SimpleControlSWTControlSWTRenderer;
 import org.eclipse.emf.ecp.view.spi.editor.controls.Helper;
 import org.eclipse.emf.ecp.view.spi.label.model.VLabel;
 import org.eclipse.emf.ecp.view.spi.model.VControl;
 import org.eclipse.emf.ecp.view.spi.model.VDomainModelReference;
 import org.eclipse.emf.ecp.view.spi.model.VFeaturePathDomainModelReference;
 import org.eclipse.emf.ecp.view.spi.table.model.VTableDomainModelReference;
 import org.eclipse.emf.ecp.view.template.model.VTViewTemplateProvider;
 import org.eclipse.emf.edit.command.SetCommand;
 import org.eclipse.emf.edit.provider.AdapterFactoryItemDelegator;
 import org.eclipse.emf.edit.provider.ComposedAdapterFactory;
 import org.eclipse.emf.edit.provider.ReflectiveItemProviderAdapterFactory;
 import org.eclipse.emfforms.spi.common.report.ReportService;
 import org.eclipse.emfforms.spi.core.services.databinding.DatabindingFailedException;
 import org.eclipse.emfforms.spi.core.services.databinding.DatabindingFailedReport;
 import org.eclipse.emfforms.spi.core.services.databinding.EMFFormsDatabinding;
 import org.eclipse.emfforms.spi.core.services.editsupport.EMFFormsEditSupport;
 import org.eclipse.emfforms.spi.core.services.label.EMFFormsLabelProvider;
 import org.eclipse.emfforms.spi.localization.LocalizationServiceHelper;
 import org.eclipse.jface.action.Action;
 import org.eclipse.jface.databinding.swt.WidgetProperties;
 import org.eclipse.jface.layout.GridDataFactory;
 import org.eclipse.jface.layout.GridLayoutFactory;
 import org.eclipse.jface.viewers.TreeViewer;
 import org.eclipse.jface.wizard.WizardDialog;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.StackLayout;
 import org.eclipse.swt.events.SelectionAdapter;
 import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.events.SelectionListener;
 import org.eclipse.swt.widgets.Button;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.swt.widgets.Label;
 import org.osgi.framework.BundleContext;
 import org.osgi.framework.FrameworkUtil;
 import org.osgi.framework.ServiceReference;

 /**
  * Renderer for DomainModelReferences.
  *
  * @author Alexandra Buzila
  *
  */
 // needed because we use the Messages class from ecp.ui.
 @SuppressWarnings("restriction")
 public class DomainModelReferenceControlSWTRenderer extends SimpleControlSWTControlSWTRenderer {

 	private static final EMFFormsDatabinding emfFormsDatabinding;
 	private static final EMFFormsLabelProvider emfFormsLabelProvider;
 	private static final VTViewTemplateProvider vtViewTemplateProvider;
 	private static EMFFormsEditSupport emfFormsEditSupport;

 	static {
 		final BundleContext bundleContext = FrameworkUtil.getBundle(EReferenceLabelControlSWTRenderer.class)
 			.getBundleContext();
 		final ServiceReference<EMFFormsDatabinding> emfFormsDatabindingServiceReference = bundleContext
 			.getServiceReference(EMFFormsDatabinding.class);
 		emfFormsDatabinding = bundleContext.getService(emfFormsDatabindingServiceReference);
 		final ServiceReference<EMFFormsEditSupport> emfFormsEditSupportServiceReference = bundleContext
 			.getServiceReference(EMFFormsEditSupport.class);
 		emfFormsEditSupport = bundleContext.getService(emfFormsEditSupportServiceReference);
 		final ServiceReference<EMFFormsLabelProvider> emfFormsLabelProviderServiceReference = bundleContext
 			.getServiceReference(EMFFormsLabelProvider.class);
 		emfFormsLabelProvider = bundleContext.getService(emfFormsLabelProviderServiceReference);
 		final ServiceReference<VTViewTemplateProvider> vtViewTemplateProviderServiceReference = bundleContext
 			.getServiceReference(VTViewTemplateProvider.class);
 		vtViewTemplateProvider = bundleContext.getService(vtViewTemplateProviderServiceReference);
 	}

 	/**
 	 * Default constructor.
 	 *
 	 * @param vElement the view model element to be rendered
 	 * @param viewContext the view context
 	 * @param reportService The {@link ReportService}
 	 */
 	public DomainModelReferenceControlSWTRenderer(VControl vElement, ViewModelContext viewContext,
 		ReportService reportService) {
 		super(vElement, viewContext, reportService, emfFormsDatabinding, emfFormsLabelProvider, vtViewTemplateProvider);
 	}

 	private Composite mainComposite;
 	private StackLayout stackLayout;
 	private Label unsetLabel;
 	private EObject eObject;
 	private EStructuralFeature structuralFeature;
 	// private Setting setting;
 	private ECPModelElementChangeListener modelElementChangeListener;
 	private ComposedAdapterFactory composedAdapterFactory;
 	private AdapterFactoryItemDelegator adapterFactoryItemDelegator;
 	private Composite parentComposite;
 	private Label setLabel;
 	private Label imageLabel;
 	private Composite contentSetComposite;

 	/**
 	 * {@inheritDoc}
 	 *
 	 * @see org.eclipse.emf.ecp.view.spi.core.swt.SimpleControlSWTControlSWTRenderer#createBindings(org.eclipse.swt.widgets.Control,
 	 *      org.eclipse.emf.ecore.EStructuralFeature.Setting)
 	 */
 	@Override
 	protected Binding[] createBindings(Control control) throws DatabindingFailedException {

 		final Binding[] bindings = new Binding[2];
 		final IObservableValue value = WidgetProperties.text().observe(setLabel);

 		bindings[0] = getDataBindingContext().bindValue(value, getModelValue(), new UpdateValueStrategy() {

 			@Override
 			public Object convert(Object value) { // target to model
 				try {
 					return getModelValue().getValue();
 				} catch (final DatabindingFailedException ex) {
 					Activator.getDefault().getReportService().report(new DatabindingFailedReport(ex));
 					return null;
 				}
 			}
 		}, new UpdateValueStrategy() {// model to target
 			@Override
 			public Object convert(Object value) {
 				updateChangeListener((EObject) value);
 				return getText(value);
 			}
 		});

 		final IObservableValue imageValue = WidgetProperties.image().observe(imageLabel);
 		bindings[1] = getDataBindingContext().bindValue(imageValue, getModelValue(),
 			new UpdateValueStrategy(UpdateValueStrategy.POLICY_NEVER), new UpdateValueStrategy() {
 				@Override
 				public Object convert(Object value) {
 					return getImage(value);
 				}
 			});

 		return bindings;
 	}

 	private Object getImage(Object value) {
 		final Object image = adapterFactoryItemDelegator.getImage(value);
 		return SWTImageHelper.getImage(image);
 	}

 	// TODO this whole method is ugly as it has to many dependencies, the generating of the text should be delegated to
 	// some service
 	private Object getText(Object object) {
 		VFeaturePathDomainModelReference modelReference = (VFeaturePathDomainModelReference) object;
 		if (VTableDomainModelReference.class.isInstance(modelReference)) {
 			VTableDomainModelReference tableRef = VTableDomainModelReference.class.cast(modelReference);
 			while (tableRef.getDomainModelReference() != null
 				&& VTableDomainModelReference.class.isInstance(tableRef.getDomainModelReference())) {
 				tableRef = VTableDomainModelReference.class.cast(tableRef.getDomainModelReference());
 			}
 			modelReference = (VFeaturePathDomainModelReference) tableRef.getDomainModelReference();
 		}
 		if (modelReference == null) {
 			return null;
 		}
 		final EStructuralFeature value = modelReference.getDomainModelEFeature();

 		String className = ""; //$NON-NLS-1$
 		final String attributeName = " -> " + adapterFactoryItemDelegator.getText(value); //$NON-NLS-1$
 		String referencePath = ""; //$NON-NLS-1$

 		for (final EReference ref : modelReference.getDomainModelEReferencePath()) {
 			if (className.isEmpty()) {
 				className = ref.getEContainingClass().getName();
 			}
 			referencePath = referencePath + " -> " + adapterFactoryItemDelegator.getText(ref); //$NON-NLS-1$
 		}
 		if (className.isEmpty() && modelReference.getDomainModelEFeature() != null
 			&& modelReference.getDomainModelEFeature().getEContainingClass() != null) {
 			className = modelReference.getDomainModelEFeature().getEContainingClass().getName();
 		}

 		final String linkText = className + referencePath + attributeName;
 		if (linkText.equals(" -> ")) { //$NON-NLS-1$
 			return null;
 		}
 		return linkText;
 	}

 	private void updateChangeListener(final EObject value) {
 		if (modelElementChangeListener != null) {
 			if (modelElementChangeListener.getTarget().equals(value)) {
 				return;
 			}
 			modelElementChangeListener.remove();
 			modelElementChangeListener = null;
 		}

 		if (value == null) {
 			if (stackLayout.topControl != unsetLabel) {
 				stackLayout.topControl = unsetLabel;
 				mainComposite.layout();
 			}

 		} else {
 			if (stackLayout.topControl != contentSetComposite) {
 				stackLayout.topControl = contentSetComposite;
 				mainComposite.layout();
 			}

 			modelElementChangeListener = new ECPModelElementChangeListener(value) {

 				@Override
 				public void onChange(Notification notification) {
 					Display.getDefault().syncExec(new Runnable() {

 						@Override
 						public void run() {
 							getDataBindingContext().updateTargets();
 						}
 					});
 				}
 			};
 		}
 	}

 	/**
 	 * {@inheritDoc}
 	 *
 	 * @see org.eclipse.emf.ecp.view.spi.core.swt.SimpleControlSWTControlSWTRenderer#createSWTControl(org.eclipse.swt.widgets.Composite)
 	 */
 	@Override
 	protected Control createSWTControl(Composite parent) throws DatabindingFailedException {
 		final IObservableValue observableValue = Activator.getDefault().getEMFFormsDatabinding()
 			.getObservableValue(getVElement().getDomainModelReference(), getViewModelContext().getDomainModel());
 		eObject = (EObject) ((IObserving) observableValue).getObserved();
 		structuralFeature = (EStructuralFeature) observableValue.getValueType();
 		observableValue.dispose();

 		final Composite containerComposite = new Composite(parent, SWT.NONE);
 		containerComposite.setBackground(parent.getBackground());
 		GridLayoutFactory.fillDefaults().applyTo(containerComposite);
 		GridDataFactory.fillDefaults().grab(true, false).align(SWT.FILL, SWT.BEGINNING).applyTo(containerComposite);

 		parentComposite = new Composite(containerComposite, SWT.NONE);
 		parentComposite.setBackground(parent.getBackground());
 		GridLayoutFactory.fillDefaults().numColumns(4).spacing(0, 0).equalWidth(false)
 			.applyTo(parentComposite);
 		GridDataFactory.fillDefaults().grab(true, false).align(SWT.FILL, SWT.BEGINNING).applyTo(parentComposite);

 		stackLayout = new StackLayout();

 		mainComposite = new Composite(parentComposite, SWT.NONE);
 		mainComposite.setBackground(parentComposite.getBackground());
 		GridDataFactory.fillDefaults().grab(true, false).align(SWT.FILL, SWT.CENTER).applyTo(mainComposite);
 		mainComposite.setLayout(stackLayout);

 		unsetLabel = new Label(mainComposite, SWT.NONE);
 		GridDataFactory.fillDefaults().grab(true, true).align(SWT.FILL, SWT.FILL).applyTo(unsetLabel);
 		unsetLabel.setText(LocalizationServiceHelper.getString(getClass(), "LinkControl_NotSet")); //$NON-NLS-1$
 		unsetLabel.setBackground(mainComposite.getBackground());
 		unsetLabel.setForeground(parentComposite.getDisplay().getSystemColor(SWT.COLOR_DARK_GRAY));
 		unsetLabel.setAlignment(SWT.CENTER);

 		contentSetComposite = new Composite(mainComposite, SWT.NONE);
 		GridLayoutFactory.fillDefaults().numColumns(2).equalWidth(false).applyTo(contentSetComposite);
 		contentSetComposite.setBackground(mainComposite.getBackground());
 		imageLabel = new Label(contentSetComposite, SWT.NONE);
 		imageLabel.setBackground(contentSetComposite.getBackground());
 		GridDataFactory.fillDefaults().grab(false, false).align(SWT.FILL, SWT.FILL).hint(17, SWT.DEFAULT)
 			.applyTo(imageLabel);
 		setLabel = new Label(contentSetComposite, SWT.NONE);
 		setLabel.setBackground(contentSetComposite.getBackground());
 		GridDataFactory.fillDefaults().grab(true, false).align(SWT.FILL, SWT.FILL).applyTo(setLabel);

 		if (eObject.eIsSet(structuralFeature)) {
 			stackLayout.topControl = contentSetComposite;
 		} else {
 			stackLayout.topControl = unsetLabel;
 		}

 		createButtons(parentComposite);

 		composedAdapterFactory = new ComposedAdapterFactory(new AdapterFactory[] {
 			new ReflectiveItemProviderAdapterFactory(),
 			new ComposedAdapterFactory(ComposedAdapterFactory.Descriptor.Registry.INSTANCE) });
 		adapterFactoryItemDelegator = new AdapterFactoryItemDelegator(composedAdapterFactory);

 		return containerComposite;
 	}

 	/**
 	 * @param parentComposite
 	 * @throws DatabindingFailedException
 	 */
 	private void createButtons(Composite composite) throws DatabindingFailedException {
 		final Button unsetBtn = createButtonForAction(new DeleteReferenceAction(getEditingDomain(eObject), eObject,
 			structuralFeature, null), composite);
 		unsetBtn.addSelectionListener(new SelectionListener() {

 			@Override
 			public void widgetSelected(SelectionEvent e) {
 				final Command setCommand = SetCommand.create(getEditingDomain(eObject), eObject, structuralFeature,
 					SetCommand.UNSET_VALUE);
 				getEditingDomain(eObject).getCommandStack().execute(setCommand);
 			}

 			@Override
 			public void widgetDefaultSelected(SelectionEvent e) {
 				// TODO Auto-generated method stub
 			}
 		});

 		final Button setBtn = createButtonForAction(new NewReferenceAction(getEditingDomain(eObject), eObject,
 			structuralFeature, emfFormsEditSupport, emfFormsLabelProvider, null, getReportService(), getVElement()
 				.getDomainModelReference(),
 			getViewModelContext().getDomainModel()), composite); // getViewModelContext().getService(ReferenceService.class)
 		setBtn.addSelectionListener(new SelectionAdapterExtension(setLabel, getModelValue(), getViewModelContext(),
 			getDataBindingContext(), structuralFeature));

 	}

 	/**
 	 * A helper method which creates a button for an action on a composite.
 	 *
 	 * @param action the action to create a button for
 	 * @param composite the composite to create the button onto
 	 * @return the created button
 	 */
 	protected Button createButtonForAction(final Action action, final Composite composite) {
 		final Button selectButton = new Button(composite, SWT.PUSH);
 		selectButton.setImage(Activator.getImage(action));
 		selectButton.setEnabled(true);
 		selectButton.setToolTipText(action.getToolTipText());
 		return selectButton;
 	}

 	/**
 	 * {@inheritDoc}
 	 *
 	 * @see org.eclipse.emf.ecp.view.spi.core.swt.SimpleControlSWTRenderer#getUnsetText()
 	 */
 	@Override
 	protected String getUnsetText() {
 		return LocalizationServiceHelper.getString(getClass(), "LinkControl_NoLinkSetClickToSetLink"); //$NON-NLS-1$
 	}

 	/** SelectionAdapter for the set button. */
 	private class SelectionAdapterExtension extends SelectionAdapter {

 		private final EStructuralFeature eStructuralFeature;

 		public SelectionAdapterExtension(Label label, IObservableValue modelValue, ViewModelContext viewModelContext,
 			DataBindingContext dataBindingContext,
 			EStructuralFeature eStructuralFeature) {
 			this.eStructuralFeature = eStructuralFeature;
 		}

 		@Override
 		public void widgetSelected(SelectionEvent e) {
 			final Collection<EClass> classes = ECPUtil.getSubClasses(((EReferenceImpl) eStructuralFeature)
 				.getEReferenceType());

 			final EClass eclass = Helper.getRootEClass(getViewModelContext().getDomainModel());

 			VDomainModelReference reference = null;
 			if (VControl.class.isInstance(eObject)) {
 				reference = VControl.class.cast(eObject).getDomainModelReference();
 			} else if (VLabel.class.isInstance(eObject)) {
 				reference = VLabel.class.cast(eObject).getDomainModelReference();
 			}

 			final CreateDomainModelReferenceWizard wizard = new CreateDomainModelReferenceWizard(
 				eObject, structuralFeature, getEditingDomain(eObject), eclass,
 				reference == null ? "New Reference Element" : "Configure " + reference.eClass().getName(), //$NON-NLS-1$ //$NON-NLS-2$
 				Messages.NewModelElementWizard_WizardTitle_AddModelElement,
 				Messages.NewModelElementWizard_PageTitle_AddModelElement,
 				Messages.NewModelElementWizard_PageDescription_AddModelElement, reference);

 			final SelectionComposite<TreeViewer> helper = CompositeFactory.getSelectModelClassComposite(
 				new HashSet<EPackage>(),
 				new HashSet<EPackage>(), classes);
 			wizard.setCompositeProvider(helper);

 			final WizardDialog wd = new WizardDialog(Display.getDefault().getActiveShell(), wizard);
 			wd.open();
 		}
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2011-2014 EclipseSource Muenchen GmbH and others.
	*
	* 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:
	* Alexandra Buzila - initial API and implementation
	******************************************************************************/
	package org.eclipse.emf.ecp.view.internal.editor.controls;

	import java.util.Collection;
	import java.util.HashSet;

	import org.eclipse.core.databinding.Binding;
	import org.eclipse.core.databinding.DataBindingContext;
	import org.eclipse.core.databinding.UpdateValueStrategy;
	import org.eclipse.core.databinding.observable.IObserving;
	import org.eclipse.core.databinding.observable.value.IObservableValue;
	import org.eclipse.emf.common.command.Command;
	import org.eclipse.emf.common.notify.AdapterFactory;
	import org.eclipse.emf.common.notify.Notification;
	import org.eclipse.emf.ecore.EClass;
	import org.eclipse.emf.ecore.EObject;
	import org.eclipse.emf.ecore.EPackage;
	import org.eclipse.emf.ecore.EReference;
	import org.eclipse.emf.ecore.EStructuralFeature;
	import org.eclipse.emf.ecore.impl.EReferenceImpl;
	import org.eclipse.emf.ecp.core.util.ECPUtil;
	import org.eclipse.emf.ecp.edit.internal.swt.SWTImageHelper;
	import org.eclipse.emf.ecp.edit.spi.swt.reference.DeleteReferenceAction;
	import org.eclipse.emf.ecp.edit.spi.swt.reference.NewReferenceAction;
	import org.eclipse.emf.ecp.edit.spi.util.ECPModelElementChangeListener;
	import org.eclipse.emf.ecp.internal.ui.Messages;
	import org.eclipse.emf.ecp.spi.common.ui.CompositeFactory;
	import org.eclipse.emf.ecp.spi.common.ui.composites.SelectionComposite;
	import org.eclipse.emf.ecp.view.internal.editor.handler.CreateDomainModelReferenceWizard;
	import org.eclipse.emf.ecp.view.spi.context.ViewModelContext;
	import org.eclipse.emf.ecp.view.spi.core.swt.SimpleControlSWTControlSWTRenderer;
	import org.eclipse.emf.ecp.view.spi.editor.controls.Helper;
	import org.eclipse.emf.ecp.view.spi.label.model.VLabel;
	import org.eclipse.emf.ecp.view.spi.model.VControl;
	import org.eclipse.emf.ecp.view.spi.model.VDomainModelReference;
	import org.eclipse.emf.ecp.view.spi.model.VFeaturePathDomainModelReference;
	import org.eclipse.emf.ecp.view.spi.table.model.VTableDomainModelReference;
	import org.eclipse.emf.ecp.view.template.model.VTViewTemplateProvider;
	import org.eclipse.emf.edit.command.SetCommand;
	import org.eclipse.emf.edit.provider.AdapterFactoryItemDelegator;
	import org.eclipse.emf.edit.provider.ComposedAdapterFactory;
	import org.eclipse.emf.edit.provider.ReflectiveItemProviderAdapterFactory;
	import org.eclipse.emfforms.spi.common.report.ReportService;
	import org.eclipse.emfforms.spi.core.services.databinding.DatabindingFailedException;
	import org.eclipse.emfforms.spi.core.services.databinding.DatabindingFailedReport;
	import org.eclipse.emfforms.spi.core.services.databinding.EMFFormsDatabinding;
	import org.eclipse.emfforms.spi.core.services.editsupport.EMFFormsEditSupport;
	import org.eclipse.emfforms.spi.core.services.label.EMFFormsLabelProvider;
	import org.eclipse.emfforms.spi.localization.LocalizationServiceHelper;
	import org.eclipse.jface.action.Action;
	import org.eclipse.jface.databinding.swt.WidgetProperties;
	import org.eclipse.jface.layout.GridDataFactory;
	import org.eclipse.jface.layout.GridLayoutFactory;
	import org.eclipse.jface.viewers.TreeViewer;
	import org.eclipse.jface.wizard.WizardDialog;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.custom.StackLayout;
	import org.eclipse.swt.events.SelectionAdapter;
	import org.eclipse.swt.events.SelectionEvent;
	import org.eclipse.swt.events.SelectionListener;
	import org.eclipse.swt.widgets.Button;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Control;
	import org.eclipse.swt.widgets.Display;
	import org.eclipse.swt.widgets.Label;
	import org.osgi.framework.BundleContext;
	import org.osgi.framework.FrameworkUtil;
	import org.osgi.framework.ServiceReference;

	/**
	* Renderer for DomainModelReferences.
	*
	* @author Alexandra Buzila
	*
	*/
	// needed because we use the Messages class from ecp.ui.
	@SuppressWarnings("restriction")
	public class DomainModelReferenceControlSWTRenderer extends SimpleControlSWTControlSWTRenderer {

	private static final EMFFormsDatabinding emfFormsDatabinding;
	private static final EMFFormsLabelProvider emfFormsLabelProvider;
	private static final VTViewTemplateProvider vtViewTemplateProvider;
	private static EMFFormsEditSupport emfFormsEditSupport;

	static {
	final BundleContext bundleContext = FrameworkUtil.getBundle(EReferenceLabelControlSWTRenderer.class)
	.getBundleContext();
	final ServiceReference<EMFFormsDatabinding> emfFormsDatabindingServiceReference = bundleContext
	.getServiceReference(EMFFormsDatabinding.class);
	emfFormsDatabinding = bundleContext.getService(emfFormsDatabindingServiceReference);
	final ServiceReference<EMFFormsEditSupport> emfFormsEditSupportServiceReference = bundleContext
	.getServiceReference(EMFFormsEditSupport.class);
	emfFormsEditSupport = bundleContext.getService(emfFormsEditSupportServiceReference);
	final ServiceReference<EMFFormsLabelProvider> emfFormsLabelProviderServiceReference = bundleContext
	.getServiceReference(EMFFormsLabelProvider.class);
	emfFormsLabelProvider = bundleContext.getService(emfFormsLabelProviderServiceReference);
	final ServiceReference<VTViewTemplateProvider> vtViewTemplateProviderServiceReference = bundleContext
	.getServiceReference(VTViewTemplateProvider.class);
	vtViewTemplateProvider = bundleContext.getService(vtViewTemplateProviderServiceReference);
	}

	/**
	* Default constructor.
	*
	* @param vElement the view model element to be rendered
	* @param viewContext the view context
	* @param reportService The {@link ReportService}
	*/
	public DomainModelReferenceControlSWTRenderer(VControl vElement, ViewModelContext viewContext,
	ReportService reportService) {
	super(vElement, viewContext, reportService, emfFormsDatabinding, emfFormsLabelProvider, vtViewTemplateProvider);
	}

	private Composite mainComposite;
	private StackLayout stackLayout;
	private Label unsetLabel;
	private EObject eObject;
	private EStructuralFeature structuralFeature;
	// private Setting setting;
	private ECPModelElementChangeListener modelElementChangeListener;
	private ComposedAdapterFactory composedAdapterFactory;
	private AdapterFactoryItemDelegator adapterFactoryItemDelegator;
	private Composite parentComposite;
	private Label setLabel;
	private Label imageLabel;
	private Composite contentSetComposite;

	/**
	* {@inheritDoc}
	*
	* @see org.eclipse.emf.ecp.view.spi.core.swt.SimpleControlSWTControlSWTRenderer#createBindings(org.eclipse.swt.widgets.Control,
	* org.eclipse.emf.ecore.EStructuralFeature.Setting)
	*/
	@Override
	protected Binding[] createBindings(Control control) throws DatabindingFailedException {

	final Binding[] bindings = new Binding[2];
	final IObservableValue value = WidgetProperties.text().observe(setLabel);

	bindings[0] = getDataBindingContext().bindValue(value, getModelValue(), new UpdateValueStrategy() {

	@Override
	public Object convert(Object value) { // target to model
	try {
	return getModelValue().getValue();
	} catch (final DatabindingFailedException ex) {
	Activator.getDefault().getReportService().report(new DatabindingFailedReport(ex));
	return null;
	}
	}
	}, new UpdateValueStrategy() {// model to target
	@Override
	public Object convert(Object value) {
	updateChangeListener((EObject) value);
	return getText(value);
	}
	});

	final IObservableValue imageValue = WidgetProperties.image().observe(imageLabel);
	bindings[1] = getDataBindingContext().bindValue(imageValue, getModelValue(),
	new UpdateValueStrategy(UpdateValueStrategy.POLICY_NEVER), new UpdateValueStrategy() {
	@Override
	public Object convert(Object value) {
	return getImage(value);
	}
	});

	return bindings;
	}

	private Object getImage(Object value) {
	final Object image = adapterFactoryItemDelegator.getImage(value);
	return SWTImageHelper.getImage(image);
	}

	// TODO this whole method is ugly as it has to many dependencies, the generating of the text should be delegated to
	// some service
	private Object getText(Object object) {
	VFeaturePathDomainModelReference modelReference = (VFeaturePathDomainModelReference) object;
	if (VTableDomainModelReference.class.isInstance(modelReference)) {
	VTableDomainModelReference tableRef = VTableDomainModelReference.class.cast(modelReference);
	while (tableRef.getDomainModelReference() != null
	&& VTableDomainModelReference.class.isInstance(tableRef.getDomainModelReference())) {
	tableRef = VTableDomainModelReference.class.cast(tableRef.getDomainModelReference());
	}
	modelReference = (VFeaturePathDomainModelReference) tableRef.getDomainModelReference();
	}
	if (modelReference == null) {
	return null;
	}
	final EStructuralFeature value = modelReference.getDomainModelEFeature();

	String className = ""; //$NON-NLS-1$
	final String attributeName = " -> " + adapterFactoryItemDelegator.getText(value); //$NON-NLS-1$
	String referencePath = ""; //$NON-NLS-1$

	for (final EReference ref : modelReference.getDomainModelEReferencePath()) {
	if (className.isEmpty()) {
	className = ref.getEContainingClass().getName();
	}
	referencePath = referencePath + " -> " + adapterFactoryItemDelegator.getText(ref); //$NON-NLS-1$
	}
	if (className.isEmpty() && modelReference.getDomainModelEFeature() != null
	&& modelReference.getDomainModelEFeature().getEContainingClass() != null) {
	className = modelReference.getDomainModelEFeature().getEContainingClass().getName();
	}

	final String linkText = className + referencePath + attributeName;
	if (linkText.equals(" -> ")) { //$NON-NLS-1$
	return null;
	}
	return linkText;
	}

	private void updateChangeListener(final EObject value) {
	if (modelElementChangeListener != null) {
	if (modelElementChangeListener.getTarget().equals(value)) {
	return;
	}
	modelElementChangeListener.remove();
	modelElementChangeListener = null;
	}

	if (value == null) {
	if (stackLayout.topControl != unsetLabel) {
	stackLayout.topControl = unsetLabel;
	mainComposite.layout();
	}

	} else {
	if (stackLayout.topControl != contentSetComposite) {
	stackLayout.topControl = contentSetComposite;
	mainComposite.layout();
	}

	modelElementChangeListener = new ECPModelElementChangeListener(value) {

	@Override
	public void onChange(Notification notification) {
	Display.getDefault().syncExec(new Runnable() {

	@Override
	public void run() {
	getDataBindingContext().updateTargets();
	}
	});
	}
	};
	}
	}

	/**
	* {@inheritDoc}
	*
	* @see org.eclipse.emf.ecp.view.spi.core.swt.SimpleControlSWTControlSWTRenderer#createSWTControl(org.eclipse.swt.widgets.Composite)
	*/
	@Override
	protected Control createSWTControl(Composite parent) throws DatabindingFailedException {
	final IObservableValue observableValue = Activator.getDefault().getEMFFormsDatabinding()
	.getObservableValue(getVElement().getDomainModelReference(), getViewModelContext().getDomainModel());
	eObject = (EObject) ((IObserving) observableValue).getObserved();
	structuralFeature = (EStructuralFeature) observableValue.getValueType();
	observableValue.dispose();

	final Composite containerComposite = new Composite(parent, SWT.NONE);
	containerComposite.setBackground(parent.getBackground());
	GridLayoutFactory.fillDefaults().applyTo(containerComposite);
	GridDataFactory.fillDefaults().grab(true, false).align(SWT.FILL, SWT.BEGINNING).applyTo(containerComposite);

	parentComposite = new Composite(containerComposite, SWT.NONE);
	parentComposite.setBackground(parent.getBackground());
	GridLayoutFactory.fillDefaults().numColumns(4).spacing(0, 0).equalWidth(false)
	.applyTo(parentComposite);
	GridDataFactory.fillDefaults().grab(true, false).align(SWT.FILL, SWT.BEGINNING).applyTo(parentComposite);

	stackLayout = new StackLayout();

	mainComposite = new Composite(parentComposite, SWT.NONE);
	mainComposite.setBackground(parentComposite.getBackground());
	GridDataFactory.fillDefaults().grab(true, false).align(SWT.FILL, SWT.CENTER).applyTo(mainComposite);
	mainComposite.setLayout(stackLayout);

	unsetLabel = new Label(mainComposite, SWT.NONE);
	GridDataFactory.fillDefaults().grab(true, true).align(SWT.FILL, SWT.FILL).applyTo(unsetLabel);
	unsetLabel.setText(LocalizationServiceHelper.getString(getClass(), "LinkControl_NotSet")); //$NON-NLS-1$
	unsetLabel.setBackground(mainComposite.getBackground());
	unsetLabel.setForeground(parentComposite.getDisplay().getSystemColor(SWT.COLOR_DARK_GRAY));
	unsetLabel.setAlignment(SWT.CENTER);

	contentSetComposite = new Composite(mainComposite, SWT.NONE);
	GridLayoutFactory.fillDefaults().numColumns(2).equalWidth(false).applyTo(contentSetComposite);
	contentSetComposite.setBackground(mainComposite.getBackground());
	imageLabel = new Label(contentSetComposite, SWT.NONE);
	imageLabel.setBackground(contentSetComposite.getBackground());
	GridDataFactory.fillDefaults().grab(false, false).align(SWT.FILL, SWT.FILL).hint(17, SWT.DEFAULT)
	.applyTo(imageLabel);
	setLabel = new Label(contentSetComposite, SWT.NONE);
	setLabel.setBackground(contentSetComposite.getBackground());
	GridDataFactory.fillDefaults().grab(true, false).align(SWT.FILL, SWT.FILL).applyTo(setLabel);

	if (eObject.eIsSet(structuralFeature)) {
	stackLayout.topControl = contentSetComposite;
	} else {
	stackLayout.topControl = unsetLabel;
	}

	createButtons(parentComposite);

	composedAdapterFactory = new ComposedAdapterFactory(new AdapterFactory[] {
	new ReflectiveItemProviderAdapterFactory(),
	new ComposedAdapterFactory(ComposedAdapterFactory.Descriptor.Registry.INSTANCE) });
	adapterFactoryItemDelegator = new AdapterFactoryItemDelegator(composedAdapterFactory);

	return containerComposite;
	}

	/**
	* @param parentComposite
	* @throws DatabindingFailedException
	*/
	private void createButtons(Composite composite) throws DatabindingFailedException {
	final Button unsetBtn = createButtonForAction(new DeleteReferenceAction(getEditingDomain(eObject), eObject,
	structuralFeature, null), composite);
	unsetBtn.addSelectionListener(new SelectionListener() {

	@Override
	public void widgetSelected(SelectionEvent e) {
	final Command setCommand = SetCommand.create(getEditingDomain(eObject), eObject, structuralFeature,
	SetCommand.UNSET_VALUE);
	getEditingDomain(eObject).getCommandStack().execute(setCommand);
	}

	@Override
	public void widgetDefaultSelected(SelectionEvent e) {
	// TODO Auto-generated method stub
	}
	});

	final Button setBtn = createButtonForAction(new NewReferenceAction(getEditingDomain(eObject), eObject,
	structuralFeature, emfFormsEditSupport, emfFormsLabelProvider, null, getReportService(), getVElement()
	.getDomainModelReference(),
	getViewModelContext().getDomainModel()), composite); // getViewModelContext().getService(ReferenceService.class)
	setBtn.addSelectionListener(new SelectionAdapterExtension(setLabel, getModelValue(), getViewModelContext(),
	getDataBindingContext(), structuralFeature));

	}

	/**
	* A helper method which creates a button for an action on a composite.
	*
	* @param action the action to create a button for
	* @param composite the composite to create the button onto
	* @return the created button
	*/
	protected Button createButtonForAction(final Action action, final Composite composite) {
	final Button selectButton = new Button(composite, SWT.PUSH);
	selectButton.setImage(Activator.getImage(action));
	selectButton.setEnabled(true);
	selectButton.setToolTipText(action.getToolTipText());
	return selectButton;
	}

	/**
	* {@inheritDoc}
	*
	* @see org.eclipse.emf.ecp.view.spi.core.swt.SimpleControlSWTRenderer#getUnsetText()
	*/
	@Override
	protected String getUnsetText() {
	return LocalizationServiceHelper.getString(getClass(), "LinkControl_NoLinkSetClickToSetLink"); //$NON-NLS-1$
	}

	/** SelectionAdapter for the set button. */
	private class SelectionAdapterExtension extends SelectionAdapter {

	private final EStructuralFeature eStructuralFeature;

	public SelectionAdapterExtension(Label label, IObservableValue modelValue, ViewModelContext viewModelContext,
	DataBindingContext dataBindingContext,
	EStructuralFeature eStructuralFeature) {
	this.eStructuralFeature = eStructuralFeature;
	}

	@Override
	public void widgetSelected(SelectionEvent e) {
	final Collection<EClass> classes = ECPUtil.getSubClasses(((EReferenceImpl) eStructuralFeature)
	.getEReferenceType());

	final EClass eclass = Helper.getRootEClass(getViewModelContext().getDomainModel());

	VDomainModelReference reference = null;
	if (VControl.class.isInstance(eObject)) {
	reference = VControl.class.cast(eObject).getDomainModelReference();
	} else if (VLabel.class.isInstance(eObject)) {
	reference = VLabel.class.cast(eObject).getDomainModelReference();
	}

	final CreateDomainModelReferenceWizard wizard = new CreateDomainModelReferenceWizard(
	eObject, structuralFeature, getEditingDomain(eObject), eclass,
	reference == null ? "New Reference Element" : "Configure " + reference.eClass().getName(), //$NON-NLS-1$ //$NON-NLS-2$
	Messages.NewModelElementWizard_WizardTitle_AddModelElement,
	Messages.NewModelElementWizard_PageTitle_AddModelElement,
	Messages.NewModelElementWizard_PageDescription_AddModelElement, reference);

	final SelectionComposite<TreeViewer> helper = CompositeFactory.getSelectModelClassComposite(
	new HashSet<EPackage>(),
	new HashSet<EPackage>(), classes);
	wizard.setCompositeProvider(helper);

	final WizardDialog wd = new WizardDialog(Display.getDefault().getActiveShell(), wizard);
	wd.open();
	}
	}
	}