| /******************************************************************************* |
| * Copyright (c) 2005, 2007 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 |
| * Brad Reynolds - bug 164653 |
| * Ashley Cambrell - bug 198904 |
| *******************************************************************************/ |
| package org.eclipse.jface.internal.databinding.internal.swt; |
| |
| import org.eclipse.core.databinding.observable.Diffs; |
| import org.eclipse.core.databinding.observable.Realm; |
| import org.eclipse.jface.internal.databinding.provisional.swt.AbstractSWTObservableValue; |
| import org.eclipse.jface.util.Assert; |
| import org.eclipse.swt.events.ModifyEvent; |
| import org.eclipse.swt.events.ModifyListener; |
| import org.eclipse.swt.widgets.Combo; |
| |
| /** |
| * @since 3.2 |
| * |
| */ |
| public class ComboObservableValue extends AbstractSWTObservableValue { |
| |
| private final Combo combo; |
| private final String attribute; |
| private boolean updating = false; |
| private String currentValue; |
| private ModifyListener modifyListener; |
| |
| /** |
| * @param combo |
| * @param attribute |
| */ |
| public ComboObservableValue(Combo combo, String attribute) { |
| super(combo); |
| this.combo = combo; |
| this.attribute = attribute; |
| init(); |
| } |
| |
| /** |
| * @param realm |
| * @param combo |
| * @param attribute |
| */ |
| public ComboObservableValue(Realm realm, Combo combo, String attribute) { |
| super(realm, combo); |
| this.combo = combo; |
| this.attribute = attribute; |
| init(); |
| } |
| |
| private void init() { |
| if (attribute.equals(SWTProperties.SELECTION) |
| || attribute.equals(SWTProperties.TEXT)) { |
| this.currentValue = combo.getText(); |
| modifyListener = new ModifyListener() { |
| |
| public void modifyText(ModifyEvent e) { |
| if (!updating) { |
| String oldValue = currentValue; |
| currentValue = ComboObservableValue.this.combo |
| .getText(); |
| |
| notifyIfChanged(oldValue, currentValue); |
| } |
| } |
| }; |
| combo.addModifyListener(modifyListener); |
| } else |
| throw new IllegalArgumentException(); |
| } |
| |
| public void doSetValue(final Object value) { |
| String oldValue = combo.getText(); |
| try { |
| updating = true; |
| if (attribute.equals(SWTProperties.TEXT)) { |
| String stringValue = value != null ? value.toString() : ""; //$NON-NLS-1$ |
| combo.setText(stringValue); |
| } else if (attribute.equals(SWTProperties.SELECTION)) { |
| String items[] = combo.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; |
| } |
| } |
| if (index == -1) { |
| combo.setText((String) value); |
| } else { |
| combo.select(index); // -1 will not "unselect" |
| } |
| } |
| } |
| } finally { |
| updating = false; |
| } |
| |
| notifyIfChanged(oldValue, combo.getText()); |
| } |
| |
| public Object doGetValue() { |
| if (attribute.equals(SWTProperties.TEXT)) |
| return combo.getText(); |
| |
| Assert.isTrue(attribute.equals(SWTProperties.SELECTION), |
| "unexpected attribute: " + attribute); //$NON-NLS-1$ |
| // The problem with a ccombo, is that it changes the text and |
| // fires before it update its selection index |
| return combo.getText(); |
| } |
| |
| public Object getValueType() { |
| Assert.isTrue(attribute.equals(SWTProperties.TEXT) |
| || attribute.equals(SWTProperties.SELECTION), |
| "unexpected attribute: " + attribute); //$NON-NLS-1$ |
| return String.class; |
| } |
| |
| /** |
| * @return attribute being observed |
| */ |
| public String getAttribute() { |
| return attribute; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.core.databinding.observable.value.AbstractObservableValue#dispose() |
| */ |
| public synchronized void dispose() { |
| super.dispose(); |
| |
| if (modifyListener != null && !combo.isDisposed()) { |
| combo.removeModifyListener(modifyListener); |
| } |
| } |
| |
| private void notifyIfChanged(String oldValue, String newValue) { |
| if (!oldValue.equals(newValue)) { |
| fireValueChange(Diffs.createValueDiff(oldValue, newValue)); |
| } |
| } |
| } |