| /******************************************************************************* |
| * Copyright (c) 2008, 2009 Matthew Hall 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: |
| * Matthew Hall - initial API and implementation (bug 207858) |
| * Matthew Hall - bugs 226765, 222991, 266038, 283351 |
| *******************************************************************************/ |
| |
| package org.eclipse.jface.databinding.viewers; |
| |
| import java.util.Iterator; |
| import java.util.Set; |
| |
| import org.eclipse.core.databinding.observable.IObservableCollection; |
| import org.eclipse.core.databinding.observable.IObservablesListener; |
| import org.eclipse.core.databinding.observable.masterdetail.IObservableFactory; |
| import org.eclipse.core.databinding.observable.set.IObservableSet; |
| import org.eclipse.core.databinding.observable.set.ISetChangeListener; |
| import org.eclipse.core.databinding.observable.set.SetChangeEvent; |
| import org.eclipse.jface.internal.databinding.viewers.ObservableCollectionTreeContentProvider; |
| import org.eclipse.jface.internal.databinding.viewers.ViewerElementSet; |
| import org.eclipse.jface.viewers.AbstractTreeViewer; |
| import org.eclipse.jface.viewers.ITreeContentProvider; |
| import org.eclipse.jface.viewers.Viewer; |
| |
| /** |
| * An {@link ITreeContentProvider} for use with an {@link AbstractTreeViewer}, |
| * which uses the provided {@link IObservableFactory set factory} to obtain the |
| * elements of a tree. Objects of this class listen for changes to each |
| * {@link IObservableSet} created by the factory, and will insert and remove |
| * viewer elements to reflect the observed changes. |
| * |
| * @noextend This class is not intended to be subclassed by clients. |
| * @since 1.2 |
| */ |
| public class ObservableSetTreeContentProvider implements ITreeContentProvider { |
| private final ObservableCollectionTreeContentProvider impl; |
| |
| private static class Impl extends ObservableCollectionTreeContentProvider { |
| Impl(IObservableFactory<Object, IObservableSet<Object>> setFactory, |
| TreeStructureAdvisor structureAdvisor) { |
| super(setFactory, structureAdvisor); |
| } |
| |
| private class SetChangeListener implements ISetChangeListener<Object> { |
| final Object parentElement; |
| |
| public SetChangeListener(Object parentElement) { |
| this.parentElement = parentElement; |
| } |
| |
| public void handleSetChange(SetChangeEvent<Object> event) { |
| if (isViewerDisposed()) |
| return; |
| |
| Set<Object> localAdditions = event.diff.getAdditions(); |
| Set<Object> localRemovals = event.diff.getRemovals(); |
| |
| Set<Object> knownElementAdditions = ViewerElementSet |
| .withComparer(comparer); |
| knownElementAdditions.addAll(localAdditions); |
| knownElementAdditions.removeAll(knownElements); |
| |
| Set<Object> knownElementRemovals = findPendingRemovals( |
| parentElement, localRemovals); |
| knownElementRemovals.retainAll(knownElements); |
| |
| knownElements.addAll(knownElementAdditions); |
| if (realizedElements != null) { |
| realizedElements.removeAll(knownElementRemovals); |
| } |
| |
| for (Iterator<Object> iterator = localAdditions.iterator(); iterator |
| .hasNext();) { |
| Object child = iterator.next(); |
| getOrCreateNode(child).addParent(parentElement); |
| } |
| |
| viewerUpdater.add(parentElement, localAdditions.toArray()); |
| viewerUpdater.remove(parentElement, localRemovals.toArray()); |
| |
| for (Iterator<Object> iterator = localRemovals.iterator(); iterator |
| .hasNext();) { |
| Object child = iterator.next(); |
| TreeNode childNode = getExistingNode(child); |
| if (childNode != null) |
| childNode.removeParent(parentElement); |
| } |
| |
| if (realizedElements != null) { |
| realizedElements.addAll(knownElementAdditions); |
| } |
| knownElements.removeAll(knownElementRemovals); |
| } |
| } |
| |
| protected IObservablesListener createCollectionChangeListener( |
| Object parentElement) { |
| return new SetChangeListener(parentElement); |
| } |
| |
| protected void addCollectionChangeListener( |
| IObservableCollection<Object> collection, |
| IObservablesListener listener) { |
| IObservableSet<Object> set = (IObservableSet<Object>) collection; |
| ISetChangeListener<Object> setListener = (ISetChangeListener<Object>) listener; |
| set.addSetChangeListener(setListener); |
| } |
| |
| protected void removeCollectionChangeListener( |
| IObservableCollection<Object> collection, IObservablesListener listener) { |
| IObservableSet<Object> set = (IObservableSet<Object>) collection; |
| ISetChangeListener<Object> setListener = (ISetChangeListener) listener; |
| set.removeSetChangeListener(setListener); |
| } |
| } |
| |
| /** |
| * Constructs an ObservableListTreeContentProvider using the given list |
| * factory. Must be called from the display thread. |
| * |
| * @param setFactory |
| * observable factory that produces an IObservableSet of children |
| * for a given parent element. Observable sets created by this |
| * factory must be on the realm of the current display. |
| * @param structureAdvisor |
| * an advisor that will be consulted from the implementations of |
| * the {@link #getParent(Object)} and |
| * {@link #hasChildren(Object)} methods, or <code>null</code> if |
| * no advisor is available. It is recommended that clients pass a |
| * non-null advisor if they can provide additional structural |
| * information about the tree. |
| */ |
| public ObservableSetTreeContentProvider(IObservableFactory<Object, IObservableSet<Object>> setFactory, |
| TreeStructureAdvisor structureAdvisor) { |
| impl = new Impl(setFactory, structureAdvisor); |
| } |
| |
| public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { |
| impl.inputChanged(viewer, oldInput, newInput); |
| } |
| |
| public Object[] getElements(Object inputElement) { |
| return impl.getElements(inputElement); |
| } |
| |
| public boolean hasChildren(Object element) { |
| return impl.hasChildren(element); |
| } |
| |
| public Object[] getChildren(Object parentElement) { |
| return impl.getChildren(parentElement); |
| } |
| |
| public Object getParent(Object element) { |
| return impl.getParent(element); |
| } |
| |
| /** |
| * Disposes of this content provider. This is called by the viewer when a |
| * content provider is replaced, or when the viewer itself is disposed. |
| * <p> |
| * The viewer should not be updated during this call, as it is in the |
| * process of being disposed. |
| * </p> |
| * <p> |
| * <em>Note:</em> Data binding content providers become unusable on |
| * disposal. |
| * </p> |
| */ |
| public void dispose() { |
| impl.dispose(); |
| } |
| |
| /** |
| * Returns the set of elements known to this content provider. Label |
| * providers may track this set if they need to be notified about additions |
| * before the viewer sees the added element, and notified about removals |
| * after the element was removed from the viewer. This is intended for use |
| * by label providers, as it will always return the items that need labels. |
| * |
| * @return readableSet of items that will need labels |
| */ |
| public IObservableSet<Object> getKnownElements() { |
| return impl.getKnownElements(); |
| } |
| |
| /** |
| * Returns the set of known elements which have been realized in the viewer. |
| * Clients may track this set in order to perform custom actions on elements |
| * while they are known to be present in the viewer. |
| * |
| * @return the set of known elements which have been realized in the viewer. |
| * @since 1.3 |
| */ |
| public IObservableSet<Object> getRealizedElements() { |
| return impl.getRealizedElements(); |
| } |
| } |