Java tutorial
/******************************************************************************* * 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: * Eugen - initial API and implementation ******************************************************************************/ package org.eclipse.emf.ecp.view.internal.editor.controls; 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.databinding.EMFDataBindingContext; import org.eclipse.emf.ecore.EObject; import org.eclipse.emf.ecore.EStructuralFeature; import org.eclipse.emf.ecp.edit.spi.swt.util.ECPDialogExecutor; import org.eclipse.emf.ecp.view.spi.context.ViewModelContext; import org.eclipse.emf.ecp.view.spi.model.VControl; import org.eclipse.emf.ecp.view.spi.swt.reporting.RenderingFailedReport; import org.eclipse.emfforms.spi.common.report.ReportService; import org.eclipse.emfforms.spi.core.services.databinding.DatabindingFailedException; import org.eclipse.emfforms.spi.core.services.label.EMFFormsLabelProvider; import org.eclipse.emfforms.spi.core.services.label.NoLabelFoundException; import org.eclipse.jface.databinding.swt.WidgetProperties; import org.eclipse.jface.dialogs.IDialogLabelKeys; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.jface.layout.GridLayoutFactory; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Shell; /** * @author Eugen Neufeld * */ public abstract class EditableEReferenceLabelControlSWTRenderer extends EReferenceLabelControlSWTRenderer { private final EMFDataBindingContext viewModelDBC; /** * @param vElement the view model element to be rendered * @param viewContext the view context * @param reportService the {@link ReportService} */ public EditableEReferenceLabelControlSWTRenderer(VControl vElement, ViewModelContext viewContext, ReportService reportService) { super(vElement, viewContext, reportService); viewModelDBC = new EMFDataBindingContext(); } /** * {@inheritDoc} * * @see org.eclipse.emf.ecp.view.internal.editor.controls.ControlRootEClassControl2SWTRenderer#createSWTControl(org.eclipse.swt.widgets.Composite) */ @Override protected Control createSWTControl(final Composite parent2) throws DatabindingFailedException { final Composite composite = (Composite) super.createSWTControl(parent2); GridLayoutFactory.fillDefaults().numColumns(3).spacing(0, 0).equalWidth(false).applyTo(composite); final EMFFormsLabelProvider labelProvider = Activator.getDefault().getEMFFormsLabelProvider(); final Button selectClass = new Button(composite, SWT.PUSH); try { final IObservableValue labelText = labelProvider.getDisplayName(getVElement().getDomainModelReference(), getViewModelContext().getDomainModel()); final IObservableValue tooltip = labelProvider.getDescription(getVElement().getDomainModelReference(), getViewModelContext().getDomainModel()); viewModelDBC.bindValue(WidgetProperties.text().observe(selectClass), labelText, null, new UpdateValueStrategy() { /** * {@inheritDoc} * * @see org.eclipse.core.databinding.UpdateValueStrategy#convert(java.lang.Object) */ @Override public Object convert(Object value) { final String result = (String) super.convert(value); return "Link " + result; //$NON-NLS-1$ } }); viewModelDBC.bindValue(WidgetProperties.tooltipText().observe(selectClass), tooltip, null, new UpdateValueStrategy() { /** * {@inheritDoc} * * @see org.eclipse.core.databinding.UpdateValueStrategy#convert(java.lang.Object) */ @Override public Object convert(Object value) { final String result = (String) super.convert(value); return "Link " + result; //$NON-NLS-1$ } }); } catch (final NoLabelFoundException e) { // FIXME Expectation? getReportService().report(new RenderingFailedReport(e)); selectClass.setText("Link "); //$NON-NLS-1$ selectClass.setToolTipText("Link "); //$NON-NLS-1$ } selectClass.addSelectionListener(new SelectionAdapter() { /** * {@inheritDoc} * * @see org.eclipse.swt.events.SelectionAdapter#widgetSelected(org.eclipse.swt.events.SelectionEvent) */ @Override public void widgetSelected(SelectionEvent e) { super.widgetSelected(e); linkValue(composite.getShell()); composite.layout(true, true); } }); final Button unset = new Button(composite, SWT.PUSH); unset.setText("Unset"); //$NON-NLS-1$ unset.setToolTipText("Unset"); //$NON-NLS-1$ final IObservableValue observableValue = Activator.getDefault().getEMFFormsDatabinding().getObservableValue( getVElement().getDomainModelReference(), getViewModelContext().getDomainModel()); final EObject eObject = (EObject) ((IObserving) observableValue).getObserved(); final EStructuralFeature structuralFeature = (EStructuralFeature) observableValue.getValueType(); observableValue.dispose(); unset.addSelectionListener(new SelectionAdapter() { /** * {@inheritDoc} * * @see org.eclipse.swt.events.SelectionAdapter#widgetSelected(org.eclipse.swt.events.SelectionEvent) */ @Override public void widgetSelected(SelectionEvent e) { super.widgetSelected(e); eObject.eUnset(structuralFeature); composite.layout(true, true); } }); return composite; } /** * This method should be overwritten to provide a correct selection mechanism. * * @param shell the Shell */ protected abstract void linkValue(Shell shell); /** * Shows an error message dialog indicating a failed value link due to an exception. * * @param shell The parent {@link Shell} of the message dialog * @param ex The {@link Exception} causing the failure */ protected void showLinkValueFailedMessageDialog(Shell shell, final Exception ex) { final MessageDialog dialog = new MessageDialog(shell, "Link Value Failed", null, //$NON-NLS-1$ "The value could not be linked due to an exception: " + ex.getMessage(), MessageDialog.ERROR, //$NON-NLS-1$ new String[] { JFaceResources.getString(IDialogLabelKeys.OK_LABEL_KEY) }, 0); new ECPDialogExecutor(dialog) { @Override public void handleResult(int codeResult) { // no op } }.execute(); } /** * {@inheritDoc} * * @see org.eclipse.emf.ecp.view.internal.editor.controls.EReferenceLabelControlSWTRenderer#dispose() */ @Override public void dispose() { viewModelDBC.dispose(); super.dispose(); } }