| /******************************************************************************* |
| * Copyright (c) 2011-2015 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: |
| * Johannes Faltermeier - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.emfforms.internal.swt.table.util; |
| |
| import org.eclipse.core.databinding.Binding; |
| import org.eclipse.core.databinding.observable.value.IObservableValue; |
| import org.eclipse.core.databinding.property.value.IValueProperty; |
| import org.eclipse.emf.databinding.EMFDataBindingContext; |
| import org.eclipse.emf.ecore.EObject; |
| import org.eclipse.emf.ecp.view.spi.model.VDomainModelReference; |
| import org.eclipse.emfforms.spi.core.services.databinding.DatabindingFailedException; |
| import org.eclipse.emfforms.spi.core.services.databinding.EMFFormsDatabinding; |
| import org.eclipse.jface.databinding.swt.WidgetProperties; |
| import org.eclipse.jface.viewers.CellEditor; |
| import org.eclipse.jface.viewers.ColumnViewer; |
| import org.eclipse.jface.viewers.ColumnViewerEditorActivationEvent; |
| import org.eclipse.jface.viewers.ColumnViewerEditorActivationListener; |
| import org.eclipse.jface.viewers.ColumnViewerEditorDeactivationEvent; |
| import org.eclipse.jface.viewers.EditingSupport; |
| import org.eclipse.jface.viewers.ViewerCell; |
| import org.eclipse.swt.SWT; |
| import org.osgi.framework.Bundle; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.framework.FrameworkUtil; |
| import org.osgi.framework.ServiceReference; |
| |
| /** |
| * {@link EditingSupport} for a value described by a {@link org.eclipse.emf.ecp.view.spi.model.VDomainModelReference |
| * VDomainModelReference}. |
| * |
| * @author Johannes Faltermeier |
| * |
| */ |
| public class DMREditingSupport extends EditingSupport { |
| |
| private final CellEditor cellEditor; |
| |
| private final IValueProperty valueProperty; |
| |
| private EditingState editingState; |
| |
| private final ColumnViewerEditorActivationListenerHelper activationListener = new ColumnViewerEditorActivationListenerHelper(); |
| |
| /** |
| * Constructs a new {@link DMREditingSupport}. |
| * |
| * @param viewer the {@link ColumnViewer} |
| * @param cellEditor the {@link CellEditor} |
| * @param valueProperty the {@link IValueProperty} for the value of the cell |
| */ |
| public DMREditingSupport(ColumnViewer viewer, CellEditor cellEditor, IValueProperty valueProperty) { |
| super(viewer); |
| this.cellEditor = cellEditor; |
| this.valueProperty = valueProperty; |
| if (valueProperty == null) { |
| throw new IllegalArgumentException("ValueProperty may not be null"); //$NON-NLS-1$ |
| } |
| } |
| |
| /** |
| * Constructs a new {@link DMREditingSupport}. |
| * |
| * @param columnViewer the {@link ColumnViewer} |
| * @param cellEditor the {@link CellEditor} |
| * @param domainModelReference the domain model reference of the column value |
| * @param parent the domain object of the column value |
| */ |
| public DMREditingSupport(ColumnViewer columnViewer, CellEditor cellEditor, |
| VDomainModelReference domainModelReference, EObject parent) { |
| this(columnViewer, cellEditor, |
| getValueProperty(domainModelReference, parent)); |
| } |
| |
| private static IValueProperty getValueProperty(VDomainModelReference domainModelReference, EObject parent) { |
| try { |
| return getService(EMFFormsDatabinding.class).getValueProperty(domainModelReference, parent); |
| } catch (final DatabindingFailedException ex) { |
| return null; |
| } |
| } |
| |
| @Override |
| protected Object getValue(Object element) { |
| // no op |
| return null; |
| } |
| |
| @Override |
| protected void setValue(Object element, Object value) { |
| // no op |
| } |
| |
| @Override |
| protected void initializeCellEditorValue(CellEditor cellEditor, ViewerCell cell) { |
| final EMFDataBindingContext bindingContext = new EMFDataBindingContext(); |
| final IObservableValue target = doCreateCellEditorObservable(cellEditor); |
| final IObservableValue model = valueProperty.observe(cell.getElement()); |
| final Binding binding = bindingContext.bindValue(target, model); |
| editingState = new EditingState(bindingContext, binding, target, model); |
| getViewer().getColumnViewerEditor().addEditorActivationListener(activationListener); |
| } |
| |
| @Override |
| protected CellEditor getCellEditor(Object element) { |
| return cellEditor; |
| } |
| |
| private IObservableValue doCreateCellEditorObservable(CellEditor cellEditor) { |
| return WidgetProperties.text(SWT.FocusOut).observe(cellEditor.getControl()); |
| } |
| |
| @Override |
| protected final void saveCellEditorValue(CellEditor cellEditor, ViewerCell cell) { |
| editingState.binding.updateTargetToModel(); |
| } |
| |
| @Override |
| protected boolean canEdit(Object element) { |
| return true; |
| } |
| |
| private static <T> T getService(Class<T> clazz) { |
| final Bundle bundle = FrameworkUtil.getBundle(DMRCellLabelProvider.class); |
| final BundleContext bundleContext = bundle.getBundleContext(); |
| final ServiceReference<T> serviceReference = bundleContext.getServiceReference(clazz); |
| final T service = bundleContext.getService(serviceReference); |
| bundleContext.ungetService(serviceReference); |
| return service; |
| } |
| |
| /** |
| * A ColumnViewerEditorActivationListener to reset the cells after focus lost. |
| * |
| * @author Eugen Neufeld |
| * |
| */ |
| private class ColumnViewerEditorActivationListenerHelper extends ColumnViewerEditorActivationListener { |
| |
| @Override |
| public void afterEditorActivated(ColumnViewerEditorActivationEvent event) { |
| // no op |
| } |
| |
| @Override |
| public void afterEditorDeactivated(ColumnViewerEditorDeactivationEvent event) { |
| editingState.dispose(); |
| editingState = null; |
| |
| getViewer().getColumnViewerEditor().removeEditorActivationListener(this); |
| final ViewerCell focusCell = getViewer().getColumnViewerEditor().getFocusCell(); |
| if (focusCell != null) { |
| getViewer().update(focusCell.getElement(), null); |
| } |
| } |
| |
| @Override |
| public void beforeEditorActivated(ColumnViewerEditorActivationEvent event) { |
| // do nothing |
| } |
| |
| @Override |
| public void beforeEditorDeactivated(ColumnViewerEditorDeactivationEvent event) { |
| // do nothing |
| } |
| } |
| |
| /** @author Johannes Faltermeier */ |
| private class EditingState { |
| private final EMFDataBindingContext bindingContext; |
| |
| private final IObservableValue target; |
| |
| private final IObservableValue model; |
| |
| private final Binding binding; |
| |
| EditingState(EMFDataBindingContext bindingContext, Binding binding, IObservableValue target, |
| IObservableValue model) { |
| this.binding = binding; |
| this.target = target; |
| this.model = model; |
| this.bindingContext = bindingContext; |
| } |
| |
| void dispose() { |
| binding.dispose(); |
| target.dispose(); |
| model.dispose(); |
| bindingContext.dispose(); |
| } |
| } |
| } |