bundles/org.eclipse.emf.ecp.view.section.ui.swt/src/org/eclipse/emf/ecp/view/spi/section/swt/AbstractSectionSWTRenderer.java - emfclient/org.eclipse.emf.ecp.core - Git at Google

 /*******************************************************************************
  * Copyright (c) 2011-2013 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 2.0
  * which accompanies this distribution, and is available at
  * https://www.eclipse.org/legal/epl-2.0/
  *
  * SPDX-License-Identifier: EPL-2.0
  *
  * Contributors:
  * Johannes Faltermeier - initial API and implementation
  ******************************************************************************/
 package org.eclipse.emf.ecp.view.spi.section.swt;

 import java.util.Collection;
 import java.util.LinkedHashMap;
 import java.util.LinkedHashSet;
 import java.util.Map;
 import java.util.Set;

 import org.eclipse.emf.databinding.EMFDataBindingContext;
 import org.eclipse.emf.ecore.EObject;
 import org.eclipse.emf.ecp.view.model.common.util.RendererUtil;
 import org.eclipse.emf.ecp.view.spi.context.ViewModelContext;
 import org.eclipse.emf.ecp.view.spi.model.VContainedElement;
 import org.eclipse.emf.ecp.view.spi.model.VControl;
 import org.eclipse.emf.ecp.view.spi.model.VElement;
 import org.eclipse.emf.ecp.view.spi.renderer.NoPropertyDescriptorFoundExeption;
 import org.eclipse.emf.ecp.view.spi.renderer.NoRendererFoundException;
 import org.eclipse.emf.ecp.view.spi.section.model.VSection;
 import org.eclipse.emf.ecp.view.spi.section.model.VSectionedArea;
 import org.eclipse.emf.ecp.view.spi.swt.layout.LayoutProviderHelper;
 import org.eclipse.emf.ecp.view.spi.swt.reporting.RenderingFailedReport;
 import org.eclipse.emf.ecp.view.template.model.VTViewTemplateProvider;
 import org.eclipse.emf.ecp.view.template.style.labelwidth.model.VTLabelWidthStyleProperty;
 import org.eclipse.emfforms.common.Optional;
 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.EMFFormsDatabinding;
 import org.eclipse.emfforms.spi.swt.core.AbstractAdditionalSWTRenderer;
 import org.eclipse.emfforms.spi.swt.core.AbstractSWTRenderer;
 import org.eclipse.emfforms.spi.swt.core.EMFFormsNoRendererException;
 import org.eclipse.emfforms.spi.swt.core.EMFFormsRendererFactory;
 import org.eclipse.emfforms.spi.swt.core.layout.GridDescriptionFactory;
 import org.eclipse.emfforms.spi.swt.core.layout.SWTGridCell;
 import org.eclipse.emfforms.spi.swt.core.layout.SWTGridDescription;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Layout;

 /**
  * Common super class for all section renderer.
  *
  * @author jfaltermeier
  * @noextend This class is not intended to be subclassed by clients.
  */
 public abstract class AbstractSectionSWTRenderer extends
 	AbstractSWTRenderer<VSection> {

 	private final EMFDataBindingContext dbc;
 	private final VTViewTemplateProvider viewTemplateProvider;

 	/**
 	 * @param vElement the view model element to be rendered
 	 * @param viewContext the view context
 	 * @param reportService the {@link ReportService}
 	 * @param viewTemplateProvider the {@link VTViewTemplateProvider}
 	 * @since 1.18
 	 */
 	public AbstractSectionSWTRenderer(VSection vElement, ViewModelContext viewContext, ReportService reportService,
 		VTViewTemplateProvider viewTemplateProvider) {
 		super(vElement, viewContext, reportService);
 		this.viewTemplateProvider = viewTemplateProvider;
 		dbc = new EMFDataBindingContext();
 	}

 	/**
 	 * @return the viewTemplateProvider the {@link VTViewTemplateProvider}
 	 * @since 1.18
 	 */
 	protected VTViewTemplateProvider getViewTemplateProvider() {
 		return viewTemplateProvider;
 	}

 	@Override
 	protected Control renderControl(SWTGridCell cell, Composite parent)
 		throws NoRendererFoundException, NoPropertyDescriptorFoundExeption {
 		if (cell.getRenderer() == this) {
 			if (cell.getColumn() == 0) {
 				return createFirstColumn(parent);
 			} else if (cell.getColumn() < 0) {
 				return renderEmpty(parent);
 			} else {
 				/*-1 because label is column 0*/
 				return renderChild(parent, getVElement().getChildren().get(cell.getColumn() - 1));
 			}
 		}
 		return cell.getRenderer().render(cell, parent);

 	}

 	/**
 	 * Renders the first column.
 	 *
 	 * @param parent the parent composite
 	 * @return the rendered control
 	 */
 	protected abstract Control createFirstColumn(Composite parent);

 	private Control renderEmpty(Composite parent) {
 		return new Label(parent, SWT.NONE);
 	}

 	// BEGIN COMPLEX CODE
 	private Control renderChild(Composite parent, VContainedElement child)
 		throws NoRendererFoundException {
 		final Composite columnComposite = new Composite(parent, SWT.NONE);
 		columnComposite.setBackground(parent.getBackground());

 		final Map<VContainedElement, Collection<AbstractSWTRenderer<VElement>>> elementRendererMap = new LinkedHashMap<VContainedElement, Collection<AbstractSWTRenderer<VElement>>>();
 		SWTGridDescription maximalGridDescription = null;
 		final Map<VContainedElement, SWTGridDescription> rowGridDescription = new LinkedHashMap<VContainedElement, SWTGridDescription>();
 		final Map<VContainedElement, SWTGridDescription> controlGridDescription = new LinkedHashMap<VContainedElement, SWTGridDescription>();

 		if (VControl.class.isInstance(child)) {
 			if (VControl.class.cast(child).getDomainModelReference() == null) {
 				return columnComposite;
 			}
 			try {
 				getViewModelContext().getService(EMFFormsDatabinding.class)
 					.getValueProperty(VControl.class.cast(child).getDomainModelReference(),
 						getViewModelContext().getDomainModel());
 			} catch (final DatabindingFailedException ex) {
 				getReportService().report(new RenderingFailedReport(ex));
 				return columnComposite;
 			}
 		}

 		AbstractSWTRenderer<VElement> renderer;
 		try {
 			renderer = getEMFFormsRendererFactory()
 				.getRendererInstance(child, getViewModelContext());
 		} catch (final EMFFormsNoRendererException ex) {
 			getReportService().report(new RenderingFailedReport(ex));
 			return columnComposite;
 		}
 		final Collection<AbstractAdditionalSWTRenderer<VElement>> additionalRenderers = getEMFFormsRendererFactory()
 			.getAdditionalRendererInstances(child, getViewModelContext());
 		SWTGridDescription gridDescription = renderer
 			.getGridDescription(GridDescriptionFactory.INSTANCE
 				.createEmptyGridDescription());
 		controlGridDescription.put(child, gridDescription);

 		for (final AbstractAdditionalSWTRenderer<VElement> additionalRenderer : additionalRenderers) {
 			gridDescription = additionalRenderer
 				.getGridDescription(gridDescription);
 		}
 		rowGridDescription.put(child, gridDescription);
 		maximalGridDescription = gridDescription;
 		final Set<AbstractSWTRenderer<VElement>> allRenderer = new LinkedHashSet<AbstractSWTRenderer<VElement>>();
 		allRenderer.add(renderer);
 		allRenderer.addAll(additionalRenderers);
 		elementRendererMap.put(child, allRenderer);

 		if (maximalGridDescription == null) {
 			return columnComposite;
 		}
 		columnComposite.setLayout(getLayout(
 			maximalGridDescription.getColumns(), false));

 		try {
 			final SWTGridDescription gridDescription2 = rowGridDescription
 				.get(child);
 			if (gridDescription2 == null) {
 				return columnComposite;
 			}
 			for (final SWTGridCell childGridCell : gridDescription2.getGrid()) {

 				final Control control = childGridCell.getRenderer().render(
 					childGridCell, columnComposite);
 				// TODO who should apply the layout
 				if (control == null) {
 					continue;
 				}

 				// TODO possible layout issues?
 				setLayoutDataForControl(childGridCell,
 					controlGridDescription.get(child), gridDescription2,
 					maximalGridDescription, childGridCell.getRenderer()
 						.getVElement(),
 					control);

 			}
 			for (final SWTGridCell childGridCell : gridDescription2.getGrid()) {
 				childGridCell.getRenderer().finalizeRendering(columnComposite);
 			}
 		} catch (final NoPropertyDescriptorFoundExeption ex) {
 			getReportService().report(new RenderingFailedReport(ex));
 			return columnComposite;
 		}

 		return columnComposite;
 	}

 	// END COMPLEX CODE

 	private Layout getLayout(int numControls, boolean equalWidth) {
 		return LayoutProviderHelper.getColumnLayout(numControls, equalWidth);
 	}

 	/**
 	 * Adjusts the visibility for all gridcells based on the collapse state.
 	 *
 	 * @param collapsed the collapse state
 	 */
 	protected void adjustLayoutData(boolean collapsed) {
 		final boolean visible = collapsed;
 		for (final SWTGridCell gridCell : getControls().keySet()) {
 			final Object layoutData = getControls().get(gridCell)
 				.getLayoutData();
 			if (GridData.class.isInstance(layoutData)) {
 				final GridData gridData = (GridData) layoutData;
 				if (gridData != null) {
 					gridData.exclude = !visible;
 				}
 			}
 			getControls().get(gridCell).setVisible(visible);
 		}
 	}

 	/**
 	 * Access to the EMFFormsRendererFactory.
 	 *
 	 * @return The {@link EMFFormsRendererFactory}
 	 * @since 1.6
 	 */
 	protected EMFFormsRendererFactory getEMFFormsRendererFactory() {
 		return getViewModelContext().getService(EMFFormsRendererFactory.class);
 	}

 	/**
 	 * Sets the LayoutData for the specified control.
 	 *
 	 * @param gridCell the {@link GridCell} used to render the control
 	 * @param gridDescription the {@link GridDescription} of the parent which rendered the control
 	 * @param currentRowGridDescription the {@link GridDescription} of the current row
 	 * @param fullGridDescription the {@link GridDescription} of the whole container
 	 * @param vElement the {@link VElement} to set the layoutData for
 	 * @param control the control to set the layout to
 	 */
 	private void setLayoutDataForControl(SWTGridCell gridCell, SWTGridDescription gridDescription,
 		SWTGridDescription currentRowGridDescription, SWTGridDescription fullGridDescription, VElement vElement,
 		Control control) {

 		control.setLayoutData(LayoutProviderHelper.getLayoutData(gridCell, gridDescription, currentRowGridDescription,
 			fullGridDescription, vElement, getViewModelContext().getDomainModel(), control));

 	}

 	/**
 	 * Returns the {@link EMFDataBindingContext}.
 	 *
 	 * @return the data binding context
 	 * @since 1.13
 	 */
 	protected EMFDataBindingContext getDataBindingContext() {
 		return dbc;
 	}

 	/**
 	 * {@inheritDoc}
 	 *
 	 * @see org.eclipse.emfforms.spi.swt.core.AbstractSWTRenderer#dispose()
 	 */
 	@Override
 	protected void dispose() {
 		dbc.dispose();
 		super.dispose();
 	}

 	/**
 	 * Called by the {@link org.eclipse.emf.ecp.view.spi.section.model.VSectionedArea} when all children have been
 	 * renderered. Initialises the collapse state based on {@link VSection#isCollapsed()}.
 	 *
 	 * @since 1.6
 	 */
 	protected abstract void initCollapseState();

 	/**
 	 * @return the left margin
 	 * @since 1.16
 	 */
 	protected int computeLeftMargin() {
 		int numberOfParents = 0;
 		EObject current = getVElement().eContainer();
 		while (!VSectionedArea.class.isInstance(current)) {
 			numberOfParents++;
 			current = current.eContainer();
 		}
 		return (numberOfParents + 1) * 16;
 	}

 	/**
 	 * The label width.
 	 *
 	 * @return the width
 	 * @since 1.18
 	 */
 	protected Optional<Integer> getLabelWidth() {
 		final VTLabelWidthStyleProperty styleProperty = RendererUtil.getStyleProperty(
 			getViewTemplateProvider(),
 			getVElement(),
 			getViewModelContext(),
 			VTLabelWidthStyleProperty.class);
 		if (styleProperty == null || !styleProperty.isSetWidth()) {
 			return Optional.empty();
 		}
 		return Optional.of(styleProperty.getWidth());
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2011-2013 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 2.0
	* which accompanies this distribution, and is available at
	* https://www.eclipse.org/legal/epl-2.0/
	*
	* SPDX-License-Identifier: EPL-2.0
	*
	* Contributors:
	* Johannes Faltermeier - initial API and implementation
	******************************************************************************/
	package org.eclipse.emf.ecp.view.spi.section.swt;

	import java.util.Collection;
	import java.util.LinkedHashMap;
	import java.util.LinkedHashSet;
	import java.util.Map;
	import java.util.Set;

	import org.eclipse.emf.databinding.EMFDataBindingContext;
	import org.eclipse.emf.ecore.EObject;
	import org.eclipse.emf.ecp.view.model.common.util.RendererUtil;
	import org.eclipse.emf.ecp.view.spi.context.ViewModelContext;
	import org.eclipse.emf.ecp.view.spi.model.VContainedElement;
	import org.eclipse.emf.ecp.view.spi.model.VControl;
	import org.eclipse.emf.ecp.view.spi.model.VElement;
	import org.eclipse.emf.ecp.view.spi.renderer.NoPropertyDescriptorFoundExeption;
	import org.eclipse.emf.ecp.view.spi.renderer.NoRendererFoundException;
	import org.eclipse.emf.ecp.view.spi.section.model.VSection;
	import org.eclipse.emf.ecp.view.spi.section.model.VSectionedArea;
	import org.eclipse.emf.ecp.view.spi.swt.layout.LayoutProviderHelper;
	import org.eclipse.emf.ecp.view.spi.swt.reporting.RenderingFailedReport;
	import org.eclipse.emf.ecp.view.template.model.VTViewTemplateProvider;
	import org.eclipse.emf.ecp.view.template.style.labelwidth.model.VTLabelWidthStyleProperty;
	import org.eclipse.emfforms.common.Optional;
	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.EMFFormsDatabinding;
	import org.eclipse.emfforms.spi.swt.core.AbstractAdditionalSWTRenderer;
	import org.eclipse.emfforms.spi.swt.core.AbstractSWTRenderer;
	import org.eclipse.emfforms.spi.swt.core.EMFFormsNoRendererException;
	import org.eclipse.emfforms.spi.swt.core.EMFFormsRendererFactory;
	import org.eclipse.emfforms.spi.swt.core.layout.GridDescriptionFactory;
	import org.eclipse.emfforms.spi.swt.core.layout.SWTGridCell;
	import org.eclipse.emfforms.spi.swt.core.layout.SWTGridDescription;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Control;
	import org.eclipse.swt.widgets.Label;
	import org.eclipse.swt.widgets.Layout;

	/**
	* Common super class for all section renderer.
	*
	* @author jfaltermeier
	* @noextend This class is not intended to be subclassed by clients.
	*/
	public abstract class AbstractSectionSWTRenderer extends
	AbstractSWTRenderer<VSection> {

	private final EMFDataBindingContext dbc;
	private final VTViewTemplateProvider viewTemplateProvider;

	/**
	* @param vElement the view model element to be rendered
	* @param viewContext the view context
	* @param reportService the {@link ReportService}
	* @param viewTemplateProvider the {@link VTViewTemplateProvider}
	* @since 1.18
	*/
	public AbstractSectionSWTRenderer(VSection vElement, ViewModelContext viewContext, ReportService reportService,
	VTViewTemplateProvider viewTemplateProvider) {
	super(vElement, viewContext, reportService);
	this.viewTemplateProvider = viewTemplateProvider;
	dbc = new EMFDataBindingContext();
	}

	/**
	* @return the viewTemplateProvider the {@link VTViewTemplateProvider}
	* @since 1.18
	*/
	protected VTViewTemplateProvider getViewTemplateProvider() {
	return viewTemplateProvider;
	}

	@Override
	protected Control renderControl(SWTGridCell cell, Composite parent)
	throws NoRendererFoundException, NoPropertyDescriptorFoundExeption {
	if (cell.getRenderer() == this) {
	if (cell.getColumn() == 0) {
	return createFirstColumn(parent);
	} else if (cell.getColumn() < 0) {
	return renderEmpty(parent);
	} else {
	/-1 because label is column 0/
	return renderChild(parent, getVElement().getChildren().get(cell.getColumn() - 1));
	}
	}
	return cell.getRenderer().render(cell, parent);

	}

	/**
	* Renders the first column.
	*
	* @param parent the parent composite
	* @return the rendered control
	*/
	protected abstract Control createFirstColumn(Composite parent);

	private Control renderEmpty(Composite parent) {
	return new Label(parent, SWT.NONE);
	}

	// BEGIN COMPLEX CODE
	private Control renderChild(Composite parent, VContainedElement child)
	throws NoRendererFoundException {
	final Composite columnComposite = new Composite(parent, SWT.NONE);
	columnComposite.setBackground(parent.getBackground());

	final Map<VContainedElement, Collection<AbstractSWTRenderer<VElement>>> elementRendererMap = new LinkedHashMap<VContainedElement, Collection<AbstractSWTRenderer<VElement>>>();
	SWTGridDescription maximalGridDescription = null;
	final Map<VContainedElement, SWTGridDescription> rowGridDescription = new LinkedHashMap<VContainedElement, SWTGridDescription>();
	final Map<VContainedElement, SWTGridDescription> controlGridDescription = new LinkedHashMap<VContainedElement, SWTGridDescription>();

	if (VControl.class.isInstance(child)) {
	if (VControl.class.cast(child).getDomainModelReference() == null) {
	return columnComposite;
	}
	try {
	getViewModelContext().getService(EMFFormsDatabinding.class)
	.getValueProperty(VControl.class.cast(child).getDomainModelReference(),
	getViewModelContext().getDomainModel());
	} catch (final DatabindingFailedException ex) {
	getReportService().report(new RenderingFailedReport(ex));
	return columnComposite;
	}
	}

	AbstractSWTRenderer<VElement> renderer;
	try {
	renderer = getEMFFormsRendererFactory()
	.getRendererInstance(child, getViewModelContext());
	} catch (final EMFFormsNoRendererException ex) {
	getReportService().report(new RenderingFailedReport(ex));
	return columnComposite;
	}
	final Collection<AbstractAdditionalSWTRenderer<VElement>> additionalRenderers = getEMFFormsRendererFactory()
	.getAdditionalRendererInstances(child, getViewModelContext());
	SWTGridDescription gridDescription = renderer
	.getGridDescription(GridDescriptionFactory.INSTANCE
	.createEmptyGridDescription());
	controlGridDescription.put(child, gridDescription);

	for (final AbstractAdditionalSWTRenderer<VElement> additionalRenderer : additionalRenderers) {
	gridDescription = additionalRenderer
	.getGridDescription(gridDescription);
	}
	rowGridDescription.put(child, gridDescription);
	maximalGridDescription = gridDescription;
	final Set<AbstractSWTRenderer<VElement>> allRenderer = new LinkedHashSet<AbstractSWTRenderer<VElement>>();
	allRenderer.add(renderer);
	allRenderer.addAll(additionalRenderers);
	elementRendererMap.put(child, allRenderer);

	if (maximalGridDescription == null) {
	return columnComposite;
	}
	columnComposite.setLayout(getLayout(
	maximalGridDescription.getColumns(), false));

	try {
	final SWTGridDescription gridDescription2 = rowGridDescription
	.get(child);
	if (gridDescription2 == null) {
	return columnComposite;
	}
	for (final SWTGridCell childGridCell : gridDescription2.getGrid()) {

	final Control control = childGridCell.getRenderer().render(
	childGridCell, columnComposite);
	// TODO who should apply the layout
	if (control == null) {
	continue;
	}

	// TODO possible layout issues?
	setLayoutDataForControl(childGridCell,
	controlGridDescription.get(child), gridDescription2,
	maximalGridDescription, childGridCell.getRenderer()
	.getVElement(),
	control);

	}
	for (final SWTGridCell childGridCell : gridDescription2.getGrid()) {
	childGridCell.getRenderer().finalizeRendering(columnComposite);
	}
	} catch (final NoPropertyDescriptorFoundExeption ex) {
	getReportService().report(new RenderingFailedReport(ex));
	return columnComposite;
	}

	return columnComposite;
	}

	// END COMPLEX CODE

	private Layout getLayout(int numControls, boolean equalWidth) {
	return LayoutProviderHelper.getColumnLayout(numControls, equalWidth);
	}

	/**
	* Adjusts the visibility for all gridcells based on the collapse state.
	*
	* @param collapsed the collapse state
	*/
	protected void adjustLayoutData(boolean collapsed) {
	final boolean visible = collapsed;
	for (final SWTGridCell gridCell : getControls().keySet()) {
	final Object layoutData = getControls().get(gridCell)
	.getLayoutData();
	if (GridData.class.isInstance(layoutData)) {
	final GridData gridData = (GridData) layoutData;
	if (gridData != null) {
	gridData.exclude = !visible;
	}
	}
	getControls().get(gridCell).setVisible(visible);
	}
	}

	/**
	* Access to the EMFFormsRendererFactory.
	*
	* @return The {@link EMFFormsRendererFactory}
	* @since 1.6
	*/
	protected EMFFormsRendererFactory getEMFFormsRendererFactory() {
	return getViewModelContext().getService(EMFFormsRendererFactory.class);
	}

	/**
	* Sets the LayoutData for the specified control.
	*
	* @param gridCell the {@link GridCell} used to render the control
	* @param gridDescription the {@link GridDescription} of the parent which rendered the control
	* @param currentRowGridDescription the {@link GridDescription} of the current row
	* @param fullGridDescription the {@link GridDescription} of the whole container
	* @param vElement the {@link VElement} to set the layoutData for
	* @param control the control to set the layout to
	*/
	private void setLayoutDataForControl(SWTGridCell gridCell, SWTGridDescription gridDescription,
	SWTGridDescription currentRowGridDescription, SWTGridDescription fullGridDescription, VElement vElement,
	Control control) {

	control.setLayoutData(LayoutProviderHelper.getLayoutData(gridCell, gridDescription, currentRowGridDescription,
	fullGridDescription, vElement, getViewModelContext().getDomainModel(), control));

	}

	/**
	* Returns the {@link EMFDataBindingContext}.
	*
	* @return the data binding context
	* @since 1.13
	*/
	protected EMFDataBindingContext getDataBindingContext() {
	return dbc;
	}

	/**
	* {@inheritDoc}
	*
	* @see org.eclipse.emfforms.spi.swt.core.AbstractSWTRenderer#dispose()
	*/
	@Override
	protected void dispose() {
	dbc.dispose();
	super.dispose();
	}

	/**
	* Called by the {@link org.eclipse.emf.ecp.view.spi.section.model.VSectionedArea} when all children have been
	* renderered. Initialises the collapse state based on {@link VSection#isCollapsed()}.
	*
	* @since 1.6
	*/
	protected abstract void initCollapseState();

	/**
	* @return the left margin
	* @since 1.16
	*/
	protected int computeLeftMargin() {
	int numberOfParents = 0;
	EObject current = getVElement().eContainer();
	while (!VSectionedArea.class.isInstance(current)) {
	numberOfParents++;
	current = current.eContainer();
	}
	return (numberOfParents + 1) * 16;
	}

	/**
	* The label width.
	*
	* @return the width
	* @since 1.18
	*/
	protected Optional<Integer> getLabelWidth() {
	final VTLabelWidthStyleProperty styleProperty = RendererUtil.getStyleProperty(
	getViewTemplateProvider(),
	getVElement(),
	getViewModelContext(),
	VTLabelWidthStyleProperty.class);
	if (styleProperty == null \|\| !styleProperty.isSetWidth()) {
	return Optional.empty();
	}
	return Optional.of(styleProperty.getWidth());
	}
	}