| /******************************************************************************* |
| * Copyright (c) 2008, 2010 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 194734) |
| * Matthew Hall - bugs 195222, 263413, 265561, 271080 |
| * Ovidio Mallo - bug 270494 |
| ******************************************************************************/ |
| |
| package org.eclipse.jface.internal.databinding.viewers; |
| |
| import org.eclipse.core.databinding.observable.value.ValueDiff; |
| import org.eclipse.core.databinding.property.INativePropertyListener; |
| import org.eclipse.core.databinding.property.ISimplePropertyListener; |
| import org.eclipse.jface.databinding.viewers.IViewerValueProperty; |
| import org.eclipse.jface.databinding.viewers.ViewerValueProperty; |
| import org.eclipse.jface.viewers.ISelection; |
| import org.eclipse.jface.viewers.IStructuredSelection; |
| import org.eclipse.jface.viewers.StructuredSelection; |
| import org.eclipse.jface.viewers.Viewer; |
| |
| /** |
| * Use this only when the source is not a viewer. |
| * |
| * @param <S> |
| * |
| * @since 3.3 |
| * |
| */ |
| public class ViewerSingleSelectionProperty<S extends Viewer> extends |
| ViewerValueProperty<S> implements IViewerValueProperty<S> { |
| |
| private final boolean isPostSelection; |
| |
| /** |
| * Constructor. |
| * |
| * @param isPostSelection |
| * Whether the post selection or the normal selection is to be |
| * observed. |
| */ |
| public ViewerSingleSelectionProperty(boolean isPostSelection) { |
| this.isPostSelection = isPostSelection; |
| } |
| |
| public Object getValueType() { |
| return null; |
| } |
| |
| protected Object doGetValue(S source) { |
| ISelection selection = source.getSelection(); |
| if (selection instanceof IStructuredSelection) { |
| return ((IStructuredSelection) selection).getFirstElement(); |
| } |
| return null; |
| } |
| |
| protected void doSetValue(S source, Object value) { |
| IStructuredSelection selection = value == null ? StructuredSelection.EMPTY |
| : new StructuredSelection(value); |
| source.setSelection(selection); |
| } |
| |
| public INativePropertyListener<S> adaptListener( |
| ISimplePropertyListener<ValueDiff<Object>> listener) { |
| return new SelectionChangedListener<S, ValueDiff<Object>>(this, |
| listener, isPostSelection); |
| } |
| |
| public String toString() { |
| return isPostSelection ? "IPostSelectionProvider.postSelection" //$NON-NLS-1$ |
| : "ISelectionProvider.selection"; //$NON-NLS-1$ |
| } |
| } |