| /******************************************************************************* |
| * Copyright (c) 2005, 2006 IBM Corporation 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jface.internal.databinding.internal.swt; |
| |
| import org.eclipse.jface.internal.databinding.provisional.observable.Diffs; |
| import org.eclipse.jface.internal.databinding.provisional.observable.value.AbstractObservableValue; |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.widgets.Event; |
| import org.eclipse.swt.widgets.List; |
| import org.eclipse.swt.widgets.Listener; |
| |
| /** |
| * @since 3.2 |
| * |
| */ |
| public class ListObservableValue extends AbstractObservableValue { |
| |
| private final List list; |
| |
| private boolean updating = false; |
| |
| private String currentValue; |
| |
| /** |
| * @param list |
| * @param attribute |
| */ |
| public ListObservableValue(List list) { |
| this.list = list; |
| this.currentValue = (String) doGetValue(); |
| |
| if ((list.getStyle() & SWT.MULTI) > 0) |
| throw new IllegalArgumentException( |
| "SWT.SINGLE support only for a List selection"); //$NON-NLS-1$ |
| |
| list.addListener(SWT.Selection, new Listener() { |
| |
| public void handleEvent(Event event) { |
| if (!updating) { |
| Object oldValue = currentValue; |
| currentValue = (String) doGetValue(); |
| fireValueChange(Diffs.createValueDiff(oldValue, |
| currentValue)); |
| } |
| } |
| |
| }); |
| } |
| |
| public void setValue(Object value) { |
| String oldValue = null; |
| if (list.getSelection() != null && list.getSelection().length > 0) |
| oldValue = list.getSelection()[0]; |
| try { |
| updating = true; |
| String items[] = list.getItems(); |
| int index = -1; |
| if (items != null && value != null) { |
| for (int i = 0; i < items.length; i++) { |
| if (value.equals(items[i])) { |
| index = i; |
| break; |
| } |
| } |
| list.select(index); // -1 will not "unselect" |
| } |
| currentValue = (String) value; |
| } finally { |
| updating = false; |
| } |
| fireValueChange(Diffs.createValueDiff(oldValue, value)); |
| } |
| |
| public Object doGetValue() { |
| int index = list.getSelectionIndex(); |
| if (index >= 0) |
| return list.getItem(index); |
| return null; |
| } |
| |
| public Object getValueType() { |
| return String.class; |
| } |
| |
| } |