bundles/org.eclipse.emf.ecp.view.core.swt/src/org/eclipse/emf/ecp/view/internal/core/swt/renderer/LinkControlSWTRenderer.java - emfclient/org.eclipse.emf.ecp.core - Git at Google

 /*******************************************************************************
  * Copyright (c) 2011-2016 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.core.swt.renderer;

 import javax.inject.Inject;

 import org.eclipse.core.databinding.Binding;
 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.Notification;
 import org.eclipse.emf.ecore.EObject;
 import org.eclipse.emf.ecore.EReference;
 import org.eclipse.emf.ecore.EStructuralFeature;
 import org.eclipse.emf.ecp.edit.internal.swt.util.OverlayImageDescriptor;
 import org.eclipse.emf.ecp.edit.spi.ReferenceService;
 import org.eclipse.emf.ecp.edit.spi.util.ECPModelElementChangeListener;
 import org.eclipse.emf.ecp.view.internal.core.swt.MessageKeys;
 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.model.VControl;
 import org.eclipse.emf.ecp.view.spi.util.swt.ImageRegistryService;
 import org.eclipse.emf.ecp.view.template.model.VTViewTemplateProvider;
 import org.eclipse.emf.edit.command.SetCommand;
 import org.eclipse.emf.edit.domain.EditingDomain;
 import org.eclipse.emfforms.spi.common.report.AbstractReport;
 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.core.services.label.NoLabelFoundException;
 import org.eclipse.emfforms.spi.localization.EMFFormsLocalizationService;
 import org.eclipse.jface.databinding.swt.WidgetProperties;
 import org.eclipse.jface.dialogs.MessageDialog;
 import org.eclipse.jface.layout.GridDataFactory;
 import org.eclipse.jface.layout.GridLayoutFactory;
 import org.eclipse.jface.resource.ImageDescriptor;
 import org.eclipse.jface.window.Window;
 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.graphics.Image;
 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.eclipse.swt.widgets.Link;
 import org.osgi.framework.FrameworkUtil;

 /**
  * SWT Renderer for link controls.
  *
  * @author Alexandra Buzila
  *
  */
 public class LinkControlSWTRenderer extends SimpleControlSWTControlSWTRenderer {

 	private Composite mainComposite;
 	private StackLayout stackLayout;
 	private Label imageHyperlink;
 	private Composite linkComposite;
 	private Link hyperlink;
 	private final EMFFormsLocalizationService localizationService;
 	private Button newReferenceBtn;
 	private Button addReferenceBtn;
 	private Button deleteReferenceButton;
 	private Label unsetLabel;
 	private ReferenceService referenceService;
 	private final ImageRegistryService imageRegistryService;
 	private final EMFFormsLabelProvider emfFormsLabelProvider;
 	private ECPModelElementChangeListener modelElementChangeListener;
 	private final EMFFormsEditSupport emfFormsEditSuppport;

 	/**
 	 * @param vElement the element to render
 	 * @param viewContext the view model context
 	 * @param reportService the report service
 	 * @param emfFormsDatabinding the data binding service
 	 * @param emfFormsLabelProvider the label provider
 	 * @param vtViewTemplateProvider the view template provider
 	 * @param localizationService the localization service
 	 * @param imageRegistryService the image registry service
 	 * @param emfFormsEditSuppport the edit support
 	 */
 	@Inject
 	// CHECKSTYLE.OFF: ParameterNumber
 	public LinkControlSWTRenderer(VControl vElement, ViewModelContext viewContext, ReportService reportService,
 		EMFFormsDatabinding emfFormsDatabinding, EMFFormsLabelProvider emfFormsLabelProvider,
 		VTViewTemplateProvider vtViewTemplateProvider, EMFFormsLocalizationService localizationService,
 		ImageRegistryService imageRegistryService, EMFFormsEditSupport emfFormsEditSuppport) {
 		// CHECKSTYLE.ON: ParameterNumber
 		super(vElement, viewContext, reportService, emfFormsDatabinding, emfFormsLabelProvider, vtViewTemplateProvider);
 		this.localizationService = localizationService;
 		this.imageRegistryService = imageRegistryService;
 		this.emfFormsLabelProvider = emfFormsLabelProvider;
 		this.emfFormsEditSuppport = emfFormsEditSuppport;
 	}

 	@Override
 	protected Binding[] createBindings(Control control) throws DatabindingFailedException {

 		final IObservableValue value = WidgetProperties.text().observe(hyperlink);
 		final Binding binding = getDataBindingContext().bindValue(value, getModelValue(),
 			createValueExtractingUpdateStrategy(),
 			new UpdateValueStrategy() {
 				@Override
 				public Object convert(Object value) {
 					updateChangeListener((EObject) value);
 					return "<a>" + getText(value) + "</a>"; //$NON-NLS-1$ //$NON-NLS-2$
 				}
 			});

 		final IObservableValue tooltipValue = WidgetProperties.tooltipText().observe(hyperlink);
 		final Binding tooltipBinding = getDataBindingContext().bindValue(tooltipValue, getModelValue(),
 			createValueExtractingUpdateStrategy(),
 			new UpdateValueStrategy() {
 				@Override
 				public Object convert(Object value) {
 					return getText(value);
 				}
 			});

 		final IObservableValue imageValue = WidgetProperties.image().observe(imageHyperlink);
 		final Binding imageBinding = getDataBindingContext().bindValue(imageValue, getModelValue(),
 			new UpdateValueStrategy(UpdateValueStrategy.POLICY_NEVER),
 			new UpdateValueStrategy() {
 				@Override
 				public Object convert(Object value) {
 					return getImage(value);
 				}
 			});

 		final IObservableValue deleteButtonEnablement = WidgetProperties.enabled().observe(deleteReferenceButton);
 		final Binding deleteBinding = getDataBindingContext().bindValue(deleteButtonEnablement, getModelValue(),
 			createValueExtractingUpdateStrategy(),
 			new UpdateValueStrategy() {
 				@Override
 				public Object convert(Object value) {
 					return value != null;
 				}
 			});

 		return new Binding[] { binding, tooltipBinding, imageBinding, deleteBinding };
 	}

 	private UpdateValueStrategy createValueExtractingUpdateStrategy() {
 		return new UpdateValueStrategy() {
 			@Override
 			public Object convert(Object value) {
 				try {
 					return getModelValue().getValue();
 				} catch (final DatabindingFailedException ex) {
 					getReportService().report(new DatabindingFailedReport(ex));
 				}
 				return value;
 			}
 		};
 	}

 	@Override
 	protected Control createSWTControl(Composite parent) throws DatabindingFailedException {
 		final IObservableValue observableValue = getEMFFormsDatabinding()
 			.getObservableValue(getVElement().getDomainModelReference(), getViewModelContext().getDomainModel());
 		final EStructuralFeature structuralFeature = (EStructuralFeature) observableValue.getValueType();
 		final EObject eObject = (EObject) ((IObserving) observableValue).getObserved();
 		observableValue.dispose();

 		final int numColumns = 1 + getNumButtons();

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

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

 		stackLayout = new StackLayout();
 		mainComposite.setLayout(stackLayout);

 		unsetLabel = new Label(mainComposite, SWT.CENTER);
 		unsetLabel.setText(getLocalizedString(MessageKeys.LinkControl_NotSet));

 		unsetLabel.setBackground(mainComposite.getBackground());
 		unsetLabel.setForeground(composite.getDisplay().getSystemColor(SWT.COLOR_DARK_GRAY));
 		unsetLabel.setAlignment(SWT.CENTER);

 		linkComposite = new Composite(mainComposite, SWT.NONE);
 		GridLayoutFactory.fillDefaults().numColumns(2).equalWidth(false).applyTo(linkComposite);
 		linkComposite.setBackground(mainComposite.getBackground());

 		createHyperlink();
 		GridDataFactory.fillDefaults().grab(true, false).align(SWT.FILL, SWT.CENTER).applyTo(linkComposite);

 		if (eObject.eIsSet(structuralFeature)) {
 			stackLayout.topControl = linkComposite;
 		} else {
 			stackLayout.topControl = unsetLabel;
 		}
 		createButtons(composite);
 		return composite;
 	}

 	private void createButtons(Composite parent) {

 		String elementDisplayName = null;
 		try {
 			elementDisplayName = (String) emfFormsLabelProvider.getDisplayName(getVElement().getDomainModelReference())
 				.getValue();
 		} catch (final NoLabelFoundException ex) {
 			getReportService().report(new AbstractReport(ex));
 		}

 		addReferenceBtn = new Button(parent, SWT.PUSH);
 		GridDataFactory.fillDefaults().grab(false, false).align(SWT.CENTER, SWT.CENTER).applyTo(addReferenceBtn);
 		addReferenceBtn
 			.setImage(getAddReferenceButtonImage());
 		addReferenceBtn.setToolTipText(getLocalizedString(MessageKeys.LinkControl_AddReference) + elementDisplayName);
 		addReferenceBtn.addSelectionListener(new SelectionAdapter() {
 			@SuppressWarnings("unused")
 			private static final long serialVersionUID = 1L;

 			@Override
 			public void widgetSelected(SelectionEvent e) {
 				try {
 					final EObject eObject = (EObject) ((IObserving) getModelValue()).getObserved();
 					final EReference eReference = (EReference) getModelValue().getValueType();
 					getReferenceService().addExistingModelElements(eObject, eReference);
 				} catch (final DatabindingFailedException ex) {
 					getReportService().report(new DatabindingFailedReport(ex));
 				}
 			}
 		});

 		newReferenceBtn = new Button(parent, SWT.PUSH);
 		GridDataFactory.fillDefaults().grab(false, false).align(SWT.CENTER, SWT.CENTER).applyTo(newReferenceBtn);
 		newReferenceBtn
 			.setImage(getNewReferenceButtonImage());
 		newReferenceBtn
 			.setToolTipText(getLocalizedString(MessageKeys.LinkControl_NewReference) + elementDisplayName);
 		newReferenceBtn.addSelectionListener(new SelectionAdapter() {
 			@SuppressWarnings("unused")
 			private static final long serialVersionUID = 1L;

 			@Override
 			public void widgetSelected(SelectionEvent e) {
 				try {
 					final EObject eObject = (EObject) ((IObserving) getModelValue()).getObserved();
 					final EReference eReference = (EReference) getModelValue().getValueType();
 					getReferenceService().addNewModelElements(eObject, eReference);
 				} catch (final DatabindingFailedException ex) {
 					getReportService().report(new DatabindingFailedReport(ex));
 				}
 			}
 		});

 		deleteReferenceButton = new Button(parent, SWT.PUSH);
 		GridDataFactory.fillDefaults().grab(false, false).align(SWT.CENTER, SWT.CENTER).applyTo(deleteReferenceButton);
 		deleteReferenceButton
 			.setImage(imageRegistryService.getImage(FrameworkUtil.getBundle(getClass()), "icons/unset_reference.png")); //$NON-NLS-1$
 		deleteReferenceButton.setToolTipText(getLocalizedString(MessageKeys.LinkControl_DeleteReference));
 		deleteReferenceButton.addSelectionListener(new DeleteSelectionAdapter());

 	}

 	/**
 	 * Returns the link text to be used for the given linked {@code value}.
 	 *
 	 * @param value the value
 	 * @return The link text.
 	 * @throws DatabindingFailedException
 	 * @throws NoLabelFoundException
 	 */
 	protected String getText(Object value) {
 		final String linkName = emfFormsEditSuppport.getText(getVElement().getDomainModelReference(),
 			getViewModelContext().getDomainModel(), value);
 		return linkName == null ? "" : linkName; //$NON-NLS-1$
 	}

 	/**
 	 * Returns the image to be used for the given linked {@code value}.
 	 *
 	 * @param value the object for which the image is retrieved
 	 * @return the image
 	 */
 	protected Image getImage(Object value) {
 		if (value == null) {
 			return null;
 		}
 		final Object imageDescription = emfFormsEditSuppport.getImage(getVElement().getDomainModelReference(),
 			getViewModelContext().getDomainModel(), value);
 		if (imageDescription == null) {
 			return null;
 		}
 		@SuppressWarnings("restriction")
 		final Image image = org.eclipse.emf.ecp.edit.internal.swt.SWTImageHelper.getImage(imageDescription);
 		return image;
 	}

 	private Image getNewReferenceButtonImage() {
 		final Image image = getImage(getViewModelContext().getDomainModel());
 		if (image != null) {
 			final Image addOverlay = imageRegistryService.getImage(FrameworkUtil.getBundle(getClass()),
 				"icons/add_overlay.png"); //$NON-NLS-1$

 			final OverlayImageDescriptor imageDescriptor = new OverlayImageDescriptor(image,
 				ImageDescriptor.createFromImage(addOverlay),
 				OverlayImageDescriptor.LOWER_RIGHT);
 			return imageDescriptor.createImage();
 		}
 		// fallback
 		return imageRegistryService.getImage(FrameworkUtil.getBundle(getClass()), "icons/set_reference.png"); //$NON-NLS-1$
 	}

 	private Image getAddReferenceButtonImage() {
 		final Image image = getImage(getViewModelContext().getDomainModel());
 		if (image != null) {
 			final Image overlay = imageRegistryService.getImage(FrameworkUtil.getBundle(getClass()),
 				"icons/link_overlay.png"); //$NON-NLS-1$

 			final OverlayImageDescriptor imageDescriptor = new OverlayImageDescriptor(image,
 				ImageDescriptor.createFromImage(overlay),
 				OverlayImageDescriptor.LOWER_RIGHT);
 			return imageDescriptor.createImage();
 		}
 		// fallback
 		return imageRegistryService.getImage(FrameworkUtil.getBundle(getClass()), "icons/reference.png"); //$NON-NLS-1$
 	}

 	private void createHyperlink() throws DatabindingFailedException {

 		imageHyperlink = new Label(linkComposite, SWT.NONE);
 		imageHyperlink.setBackground(linkComposite.getBackground());

 		hyperlink = new Link(linkComposite, SWT.NONE);
 		hyperlink.setData(CUSTOM_VARIANT, "org_eclipse_emf_ecp_control_reference"); //$NON-NLS-1$
 		hyperlink.setBackground(linkComposite.getBackground());
 		hyperlink.addSelectionListener(new SelectionAdapter() {
 			@SuppressWarnings("unused")
 			private static final long serialVersionUID = 1L;

 			@Override
 			public void widgetDefaultSelected(SelectionEvent e) {
 				super.widgetDefaultSelected(e);
 				widgetSelected(e);
 			}

 			@Override
 			public void widgetSelected(SelectionEvent e) {
 				super.widgetSelected(e);
 				try {
 					linkClicked((EObject) getModelValue().getValue());
 				} catch (final DatabindingFailedException ex) {
 					getReportService().report(new DatabindingFailedReport(ex));
 				}
 			}

 		});
 		GridDataFactory.fillDefaults().grab(true, false).align(SWT.FILL, SWT.BEGINNING).applyTo(hyperlink);
 	}

 	/**
 	 * This code is called whenever the link of the link widget is clicked. You can overwrite this to change the
 	 * behavior.
 	 *
 	 * @param value the EObject that is linked
 	 */
 	protected void linkClicked(EObject value) {
 		final ReferenceService referenceService = getReferenceService();
 		referenceService.openInNewContext(value);
 	}

 	private ReferenceService getReferenceService() {
 		if (referenceService == null) {
 			referenceService = getViewModelContext().getService(ReferenceService.class);
 		}
 		return referenceService;
 	}

 	private String getLocalizedString(String key) {
 		return localizationService.getString(getClass(), key);
 	}

 	/**
 	 * @return number of buttons added by the link control.
 	 */
 	protected int getNumButtons() {
 		return 3;
 	}

 	@Override
 	protected String getUnsetText() {
 		return getLocalizedString(MessageKeys.LinkControl_NoLinkSetClickToSetLink);
 	}

 	private void updateChangeListener(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 != linkComposite) {
 				stackLayout.topControl = linkComposite;
 				mainComposite.layout();
 			}

 			modelElementChangeListener = new ECPModelElementChangeListener(value) {

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

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

 	/** Selection listener for the delete reference button. */
 	class DeleteSelectionAdapter extends SelectionAdapter {
 		@SuppressWarnings("unused")
 		private static final long serialVersionUID = 1L;

 		@Override
 		public void widgetSelected(SelectionEvent e) {
 			try {
 				final EReference reference = (EReference) getModelValue().getValueType();
 				final EObject object = getViewModelContext().getDomainModel();
 				if (reference.isContainment()) {
 					if (askConfirmation(object)) {
 						delete(object, reference);
 					}
 				} else {
 					delete(object, reference);
 				}
 			} catch (final DatabindingFailedException ex) {
 				getReportService().report(new DatabindingFailedReport(ex));
 			}
 		}

 		private void delete(EObject eObject, EReference reference) {
 			final EditingDomain editingDomain = getEditingDomain(eObject);
 			final Command removeCommand = SetCommand.create(editingDomain, eObject,
 				reference, null);
 			if (removeCommand.canExecute()) {
 				editingDomain.getCommandStack().execute(removeCommand);
 			}
 		}

 		private boolean askConfirmation(EObject eObject) {
 			final String modelElementName = getText(eObject);
 			final String question = getLocalizedString(MessageKeys.LinkControl_DeleteModelQuestion)
 				+ modelElementName
 				+ getLocalizedString(MessageKeys.LinkControl_QuestionMark);
 			final MessageDialog dialog = new MessageDialog(
 				null,
 				getLocalizedString(MessageKeys.LinkControl_DeleteReferenceConfirmation),
 				null,
 				question,
 				MessageDialog.QUESTION,
 				new String[] {
 					getLocalizedString(MessageKeys.LinkControl_DeleteReferenceYes),
 					getLocalizedString(MessageKeys.LinkControl_DeleteReferenceNo) },
 				0);

 			boolean confirm = false;
 			if (dialog.open() == Window.OK) {
 				confirm = true;
 			}
 			return confirm;
 		}
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2011-2016 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.core.swt.renderer;

	import javax.inject.Inject;

	import org.eclipse.core.databinding.Binding;
	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.Notification;
	import org.eclipse.emf.ecore.EObject;
	import org.eclipse.emf.ecore.EReference;
	import org.eclipse.emf.ecore.EStructuralFeature;
	import org.eclipse.emf.ecp.edit.internal.swt.util.OverlayImageDescriptor;
	import org.eclipse.emf.ecp.edit.spi.ReferenceService;
	import org.eclipse.emf.ecp.edit.spi.util.ECPModelElementChangeListener;
	import org.eclipse.emf.ecp.view.internal.core.swt.MessageKeys;
	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.model.VControl;
	import org.eclipse.emf.ecp.view.spi.util.swt.ImageRegistryService;
	import org.eclipse.emf.ecp.view.template.model.VTViewTemplateProvider;
	import org.eclipse.emf.edit.command.SetCommand;
	import org.eclipse.emf.edit.domain.EditingDomain;
	import org.eclipse.emfforms.spi.common.report.AbstractReport;
	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.core.services.label.NoLabelFoundException;
	import org.eclipse.emfforms.spi.localization.EMFFormsLocalizationService;
	import org.eclipse.jface.databinding.swt.WidgetProperties;
	import org.eclipse.jface.dialogs.MessageDialog;
	import org.eclipse.jface.layout.GridDataFactory;
	import org.eclipse.jface.layout.GridLayoutFactory;
	import org.eclipse.jface.resource.ImageDescriptor;
	import org.eclipse.jface.window.Window;
	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.graphics.Image;
	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.eclipse.swt.widgets.Link;
	import org.osgi.framework.FrameworkUtil;

	/**
	* SWT Renderer for link controls.
	*
	* @author Alexandra Buzila
	*
	*/
	public class LinkControlSWTRenderer extends SimpleControlSWTControlSWTRenderer {

	private Composite mainComposite;
	private StackLayout stackLayout;
	private Label imageHyperlink;
	private Composite linkComposite;
	private Link hyperlink;
	private final EMFFormsLocalizationService localizationService;
	private Button newReferenceBtn;
	private Button addReferenceBtn;
	private Button deleteReferenceButton;
	private Label unsetLabel;
	private ReferenceService referenceService;
	private final ImageRegistryService imageRegistryService;
	private final EMFFormsLabelProvider emfFormsLabelProvider;
	private ECPModelElementChangeListener modelElementChangeListener;
	private final EMFFormsEditSupport emfFormsEditSuppport;

	/**
	* @param vElement the element to render
	* @param viewContext the view model context
	* @param reportService the report service
	* @param emfFormsDatabinding the data binding service
	* @param emfFormsLabelProvider the label provider
	* @param vtViewTemplateProvider the view template provider
	* @param localizationService the localization service
	* @param imageRegistryService the image registry service
	* @param emfFormsEditSuppport the edit support
	*/
	@Inject
	// CHECKSTYLE.OFF: ParameterNumber
	public LinkControlSWTRenderer(VControl vElement, ViewModelContext viewContext, ReportService reportService,
	EMFFormsDatabinding emfFormsDatabinding, EMFFormsLabelProvider emfFormsLabelProvider,
	VTViewTemplateProvider vtViewTemplateProvider, EMFFormsLocalizationService localizationService,
	ImageRegistryService imageRegistryService, EMFFormsEditSupport emfFormsEditSuppport) {
	// CHECKSTYLE.ON: ParameterNumber
	super(vElement, viewContext, reportService, emfFormsDatabinding, emfFormsLabelProvider, vtViewTemplateProvider);
	this.localizationService = localizationService;
	this.imageRegistryService = imageRegistryService;
	this.emfFormsLabelProvider = emfFormsLabelProvider;
	this.emfFormsEditSuppport = emfFormsEditSuppport;
	}

	@Override
	protected Binding[] createBindings(Control control) throws DatabindingFailedException {

	final IObservableValue value = WidgetProperties.text().observe(hyperlink);
	final Binding binding = getDataBindingContext().bindValue(value, getModelValue(),
	createValueExtractingUpdateStrategy(),
	new UpdateValueStrategy() {
	@Override
	public Object convert(Object value) {
	updateChangeListener((EObject) value);
	return "<a>" + getText(value) + "</a>"; //$NON-NLS-1$ //$NON-NLS-2$
	}
	});

	final IObservableValue tooltipValue = WidgetProperties.tooltipText().observe(hyperlink);
	final Binding tooltipBinding = getDataBindingContext().bindValue(tooltipValue, getModelValue(),
	createValueExtractingUpdateStrategy(),
	new UpdateValueStrategy() {
	@Override
	public Object convert(Object value) {
	return getText(value);
	}
	});

	final IObservableValue imageValue = WidgetProperties.image().observe(imageHyperlink);
	final Binding imageBinding = getDataBindingContext().bindValue(imageValue, getModelValue(),
	new UpdateValueStrategy(UpdateValueStrategy.POLICY_NEVER),
	new UpdateValueStrategy() {
	@Override
	public Object convert(Object value) {
	return getImage(value);
	}
	});

	final IObservableValue deleteButtonEnablement = WidgetProperties.enabled().observe(deleteReferenceButton);
	final Binding deleteBinding = getDataBindingContext().bindValue(deleteButtonEnablement, getModelValue(),
	createValueExtractingUpdateStrategy(),
	new UpdateValueStrategy() {
	@Override
	public Object convert(Object value) {
	return value != null;
	}
	});

	return new Binding[] { binding, tooltipBinding, imageBinding, deleteBinding };
	}

	private UpdateValueStrategy createValueExtractingUpdateStrategy() {
	return new UpdateValueStrategy() {
	@Override
	public Object convert(Object value) {
	try {
	return getModelValue().getValue();
	} catch (final DatabindingFailedException ex) {
	getReportService().report(new DatabindingFailedReport(ex));
	}
	return value;
	}
	};
	}

	@Override
	protected Control createSWTControl(Composite parent) throws DatabindingFailedException {
	final IObservableValue observableValue = getEMFFormsDatabinding()
	.getObservableValue(getVElement().getDomainModelReference(), getViewModelContext().getDomainModel());
	final EStructuralFeature structuralFeature = (EStructuralFeature) observableValue.getValueType();
	final EObject eObject = (EObject) ((IObserving) observableValue).getObserved();
	observableValue.dispose();

	final int numColumns = 1 + getNumButtons();

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

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

	stackLayout = new StackLayout();
	mainComposite.setLayout(stackLayout);

	unsetLabel = new Label(mainComposite, SWT.CENTER);
	unsetLabel.setText(getLocalizedString(MessageKeys.LinkControl_NotSet));

	unsetLabel.setBackground(mainComposite.getBackground());
	unsetLabel.setForeground(composite.getDisplay().getSystemColor(SWT.COLOR_DARK_GRAY));
	unsetLabel.setAlignment(SWT.CENTER);

	linkComposite = new Composite(mainComposite, SWT.NONE);
	GridLayoutFactory.fillDefaults().numColumns(2).equalWidth(false).applyTo(linkComposite);
	linkComposite.setBackground(mainComposite.getBackground());

	createHyperlink();
	GridDataFactory.fillDefaults().grab(true, false).align(SWT.FILL, SWT.CENTER).applyTo(linkComposite);

	if (eObject.eIsSet(structuralFeature)) {
	stackLayout.topControl = linkComposite;
	} else {
	stackLayout.topControl = unsetLabel;
	}
	createButtons(composite);
	return composite;
	}

	private void createButtons(Composite parent) {

	String elementDisplayName = null;
	try {
	elementDisplayName = (String) emfFormsLabelProvider.getDisplayName(getVElement().getDomainModelReference())
	.getValue();
	} catch (final NoLabelFoundException ex) {
	getReportService().report(new AbstractReport(ex));
	}

	addReferenceBtn = new Button(parent, SWT.PUSH);
	GridDataFactory.fillDefaults().grab(false, false).align(SWT.CENTER, SWT.CENTER).applyTo(addReferenceBtn);
	addReferenceBtn
	.setImage(getAddReferenceButtonImage());
	addReferenceBtn.setToolTipText(getLocalizedString(MessageKeys.LinkControl_AddReference) + elementDisplayName);
	addReferenceBtn.addSelectionListener(new SelectionAdapter() {
	@SuppressWarnings("unused")
	private static final long serialVersionUID = 1L;

	@Override
	public void widgetSelected(SelectionEvent e) {
	try {
	final EObject eObject = (EObject) ((IObserving) getModelValue()).getObserved();
	final EReference eReference = (EReference) getModelValue().getValueType();
	getReferenceService().addExistingModelElements(eObject, eReference);
	} catch (final DatabindingFailedException ex) {
	getReportService().report(new DatabindingFailedReport(ex));
	}
	}
	});

	newReferenceBtn = new Button(parent, SWT.PUSH);
	GridDataFactory.fillDefaults().grab(false, false).align(SWT.CENTER, SWT.CENTER).applyTo(newReferenceBtn);
	newReferenceBtn
	.setImage(getNewReferenceButtonImage());
	newReferenceBtn
	.setToolTipText(getLocalizedString(MessageKeys.LinkControl_NewReference) + elementDisplayName);
	newReferenceBtn.addSelectionListener(new SelectionAdapter() {
	@SuppressWarnings("unused")
	private static final long serialVersionUID = 1L;

	@Override
	public void widgetSelected(SelectionEvent e) {
	try {
	final EObject eObject = (EObject) ((IObserving) getModelValue()).getObserved();
	final EReference eReference = (EReference) getModelValue().getValueType();
	getReferenceService().addNewModelElements(eObject, eReference);
	} catch (final DatabindingFailedException ex) {
	getReportService().report(new DatabindingFailedReport(ex));
	}
	}
	});

	deleteReferenceButton = new Button(parent, SWT.PUSH);
	GridDataFactory.fillDefaults().grab(false, false).align(SWT.CENTER, SWT.CENTER).applyTo(deleteReferenceButton);
	deleteReferenceButton
	.setImage(imageRegistryService.getImage(FrameworkUtil.getBundle(getClass()), "icons/unset_reference.png")); //$NON-NLS-1$
	deleteReferenceButton.setToolTipText(getLocalizedString(MessageKeys.LinkControl_DeleteReference));
	deleteReferenceButton.addSelectionListener(new DeleteSelectionAdapter());

	}

	/**
	* Returns the link text to be used for the given linked {@code value}.
	*
	* @param value the value
	* @return The link text.
	* @throws DatabindingFailedException
	* @throws NoLabelFoundException
	*/
	protected String getText(Object value) {
	final String linkName = emfFormsEditSuppport.getText(getVElement().getDomainModelReference(),
	getViewModelContext().getDomainModel(), value);
	return linkName == null ? "" : linkName; //$NON-NLS-1$
	}

	/**
	* Returns the image to be used for the given linked {@code value}.
	*
	* @param value the object for which the image is retrieved
	* @return the image
	*/
	protected Image getImage(Object value) {
	if (value == null) {
	return null;
	}
	final Object imageDescription = emfFormsEditSuppport.getImage(getVElement().getDomainModelReference(),
	getViewModelContext().getDomainModel(), value);
	if (imageDescription == null) {
	return null;
	}
	@SuppressWarnings("restriction")
	final Image image = org.eclipse.emf.ecp.edit.internal.swt.SWTImageHelper.getImage(imageDescription);
	return image;
	}

	private Image getNewReferenceButtonImage() {
	final Image image = getImage(getViewModelContext().getDomainModel());
	if (image != null) {
	final Image addOverlay = imageRegistryService.getImage(FrameworkUtil.getBundle(getClass()),
	"icons/add_overlay.png"); //$NON-NLS-1$

	final OverlayImageDescriptor imageDescriptor = new OverlayImageDescriptor(image,
	ImageDescriptor.createFromImage(addOverlay),
	OverlayImageDescriptor.LOWER_RIGHT);
	return imageDescriptor.createImage();
	}
	// fallback
	return imageRegistryService.getImage(FrameworkUtil.getBundle(getClass()), "icons/set_reference.png"); //$NON-NLS-1$
	}

	private Image getAddReferenceButtonImage() {
	final Image image = getImage(getViewModelContext().getDomainModel());
	if (image != null) {
	final Image overlay = imageRegistryService.getImage(FrameworkUtil.getBundle(getClass()),
	"icons/link_overlay.png"); //$NON-NLS-1$

	final OverlayImageDescriptor imageDescriptor = new OverlayImageDescriptor(image,
	ImageDescriptor.createFromImage(overlay),
	OverlayImageDescriptor.LOWER_RIGHT);
	return imageDescriptor.createImage();
	}
	// fallback
	return imageRegistryService.getImage(FrameworkUtil.getBundle(getClass()), "icons/reference.png"); //$NON-NLS-1$
	}

	private void createHyperlink() throws DatabindingFailedException {

	imageHyperlink = new Label(linkComposite, SWT.NONE);
	imageHyperlink.setBackground(linkComposite.getBackground());

	hyperlink = new Link(linkComposite, SWT.NONE);
	hyperlink.setData(CUSTOM_VARIANT, "org_eclipse_emf_ecp_control_reference"); //$NON-NLS-1$
	hyperlink.setBackground(linkComposite.getBackground());
	hyperlink.addSelectionListener(new SelectionAdapter() {
	@SuppressWarnings("unused")
	private static final long serialVersionUID = 1L;

	@Override
	public void widgetDefaultSelected(SelectionEvent e) {
	super.widgetDefaultSelected(e);
	widgetSelected(e);
	}

	@Override
	public void widgetSelected(SelectionEvent e) {
	super.widgetSelected(e);
	try {
	linkClicked((EObject) getModelValue().getValue());
	} catch (final DatabindingFailedException ex) {
	getReportService().report(new DatabindingFailedReport(ex));
	}
	}

	});
	GridDataFactory.fillDefaults().grab(true, false).align(SWT.FILL, SWT.BEGINNING).applyTo(hyperlink);
	}

	/**
	* This code is called whenever the link of the link widget is clicked. You can overwrite this to change the
	* behavior.
	*
	* @param value the EObject that is linked
	*/
	protected void linkClicked(EObject value) {
	final ReferenceService referenceService = getReferenceService();
	referenceService.openInNewContext(value);
	}

	private ReferenceService getReferenceService() {
	if (referenceService == null) {
	referenceService = getViewModelContext().getService(ReferenceService.class);
	}
	return referenceService;
	}

	private String getLocalizedString(String key) {
	return localizationService.getString(getClass(), key);
	}

	/**
	* @return number of buttons added by the link control.
	*/
	protected int getNumButtons() {
	return 3;
	}

	@Override
	protected String getUnsetText() {
	return getLocalizedString(MessageKeys.LinkControl_NoLinkSetClickToSetLink);
	}

	private void updateChangeListener(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 != linkComposite) {
	stackLayout.topControl = linkComposite;
	mainComposite.layout();
	}

	modelElementChangeListener = new ECPModelElementChangeListener(value) {

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

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

	/** Selection listener for the delete reference button. */
	class DeleteSelectionAdapter extends SelectionAdapter {
	@SuppressWarnings("unused")
	private static final long serialVersionUID = 1L;

	@Override
	public void widgetSelected(SelectionEvent e) {
	try {
	final EReference reference = (EReference) getModelValue().getValueType();
	final EObject object = getViewModelContext().getDomainModel();
	if (reference.isContainment()) {
	if (askConfirmation(object)) {
	delete(object, reference);
	}
	} else {
	delete(object, reference);
	}
	} catch (final DatabindingFailedException ex) {
	getReportService().report(new DatabindingFailedReport(ex));
	}
	}

	private void delete(EObject eObject, EReference reference) {
	final EditingDomain editingDomain = getEditingDomain(eObject);
	final Command removeCommand = SetCommand.create(editingDomain, eObject,
	reference, null);
	if (removeCommand.canExecute()) {
	editingDomain.getCommandStack().execute(removeCommand);
	}
	}

	private boolean askConfirmation(EObject eObject) {
	final String modelElementName = getText(eObject);
	final String question = getLocalizedString(MessageKeys.LinkControl_DeleteModelQuestion)
	+ modelElementName
	+ getLocalizedString(MessageKeys.LinkControl_QuestionMark);
	final MessageDialog dialog = new MessageDialog(
	null,
	getLocalizedString(MessageKeys.LinkControl_DeleteReferenceConfirmation),
	null,
	question,
	MessageDialog.QUESTION,
	new String[] {
	getLocalizedString(MessageKeys.LinkControl_DeleteReferenceYes),
	getLocalizedString(MessageKeys.LinkControl_DeleteReferenceNo) },
	0);

	boolean confirm = false;
	if (dialog.open() == Window.OK) {
	confirm = true;
	}
	return confirm;
	}
	}
	}