Mercurial > projects > dwt2
view org.eclipse.jface.databinding/src/org/eclipse/jface/databinding/viewers/ObservableSetTreeContentProvider.d @ 78:0a55d2d5a946
Added file for databinding
author | Frank Benoit <benoit@tionex.de> |
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date | Tue, 14 Apr 2009 11:35:29 +0200 |
parents | |
children | 6be48cf9f95c |
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/******************************************************************************* * Copyright (c) 2008 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 - bug 226765 *******************************************************************************/ module org.eclipse.jface.databinding.viewers.ObservableSetTreeContentProvider; import java.lang.all; 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.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. * * <p> * This class is not intended to be subclassed by clients. * * @since 1.2 */ public class ObservableSetTreeContentProvider : ITreeContentProvider { private final ObservableCollectionTreeContentProvider impl; private static class Impl : ObservableCollectionTreeContentProvider { this(IObservableFactory setFactory, TreeStructureAdvisor structureAdvisor) { super(setFactory, structureAdvisor); } private class SetChangeListener : ISetChangeListener { final Object parentElement; public this(Object parentElement) { this.parentElement = parentElement; } public void handleSetChange(SetChangeEvent event) { if (isViewerDisposed()) return; Set removals = event.diff.getRemovals(); if (!removals.isEmpty()) { viewerUpdater.remove(parentElement, removals.toArray()); for (Iterator iterator = removals.iterator(); iterator .hasNext();) { Object child = iterator.next(); TreeNode childNode = getExistingNode(child); if (childNode !is null) childNode.removeParent(parentElement); } } Set additions = event.diff.getAdditions(); if (!additions.isEmpty()) { for (Iterator iterator = additions.iterator(); iterator .hasNext();) { Object child = iterator.next(); getOrCreateNode(child).addParent(parentElement); } viewerUpdater.add(parentElement, additions.toArray()); } } } protected IObservablesListener createCollectionChangeListener( Object parentElement) { return new SetChangeListener(parentElement); } protected void addCollectionChangeListener( IObservableCollection collection, IObservablesListener listener) { IObservableSet set = cast(IObservableSet) collection; ISetChangeListener setListener = cast(ISetChangeListener) listener; set.addSetChangeListener(setListener); } protected void removeCollectionChangeListener( IObservableCollection collection, IObservablesListener listener) { IObservableSet set = cast(IObservableSet) collection; ISetChangeListener setListener = cast(ISetChangeListener) listener; set.removeSetChangeListener(setListener); } } /** * Constructs an ObservableListTreeContentProvider using the given list * factory. * * @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 this(IObservableFactory 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 bool 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); } 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 getKnownElements() { return impl.getKnownElements(); } }