| /******************************************************************************* |
| * Copyright (c) 2010, 2017 BestSolution.at and others. |
| * |
| * 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: |
| * Tom Schindl <tom.schindl@bestsolution.at> - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.e4.tools.emf.ui.internal.common; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.eclipse.core.databinding.observable.Diffs; |
| import org.eclipse.core.databinding.observable.list.IListChangeListener; |
| import org.eclipse.core.databinding.observable.list.IObservableList; |
| import org.eclipse.core.databinding.observable.list.ListDiff; |
| import org.eclipse.core.databinding.observable.list.WritableList; |
| import org.eclipse.core.databinding.property.list.IListProperty; |
| |
| /** |
| * @param <P> type of the parent object |
| * @param <E> type of the child elements of the parent |
| */ |
| public class VirtualEntry<P, E> { |
| private String id; |
| private P originalParent; |
| private String label; |
| private IObservableList<E> list; |
| private IListProperty<? super P, E> property; |
| |
| public VirtualEntry(String id, IListProperty<? super P, E> property, P originalParent, String label) { |
| this.id = id; |
| this.originalParent = originalParent; |
| this.label = label; |
| this.property = property; |
| this.list = new WritableList<>(); |
| final IObservableList<E> origList = property.observe(originalParent); |
| list.addAll(cleanedList(origList)); |
| |
| final IListChangeListener<E> listener = event -> { |
| if (!VirtualEntry.this.list.isDisposed()) { |
| List<E> clean = cleanedList(event.getObservableList()); |
| ListDiff<E> diff = Diffs.computeListDiff(VirtualEntry.this.list, clean); |
| diff.applyTo(VirtualEntry.this.list); |
| } |
| }; |
| |
| origList.addListChangeListener(listener); |
| } |
| |
| public IListProperty<? super P, E> getProperty() { |
| return property; |
| } |
| |
| private List<E> cleanedList(IObservableList<? extends E> list) { |
| List<E> l = new ArrayList<>(list.size()); |
| |
| for (E o : list) { |
| if (accepted(o)) { |
| l.add(o); |
| } |
| } |
| |
| return l; |
| } |
| |
| /** |
| * Can be overridden to filter the child elements. |
| */ |
| protected boolean accepted(E o) { |
| return true; |
| } |
| |
| public IObservableList<E> getList() { |
| return list; |
| } |
| |
| public P getOriginalParent() { |
| return originalParent; |
| } |
| |
| public String getId() { |
| return id; |
| } |
| |
| @Override |
| public String toString() { |
| return label; |
| } |
| } |