| /******************************************************************************* |
| * Copyright (c) 2005 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; |
| |
| import org.eclipse.jface.databinding.ChangeEvent; |
| import org.eclipse.jface.databinding.IChangeListener; |
| import org.eclipse.jface.databinding.IDataBindingContext; |
| import org.eclipse.jface.databinding.IUpdatableCollection; |
| import org.eclipse.jface.databinding.IUpdatableValue; |
| import org.eclipse.jface.databinding.Property; |
| import org.eclipse.jface.databinding.Updatable; |
| import org.eclipse.jface.util.Assert; |
| |
| /** |
| * @since 3.2 |
| * |
| */ |
| public class NestedUpdatableCollection extends Updatable implements |
| IUpdatableCollection { |
| |
| private boolean updating = false; |
| |
| private IChangeListener innerChangeListener = new IChangeListener() { |
| public void handleChange(ChangeEvent changeEvent) { |
| if (!updating) { |
| ChangeEvent nestedEvent = fireChangeEvent(changeEvent.getChangeType(), changeEvent |
| .getOldValue(), changeEvent.getNewValue(), changeEvent.getParent(), changeEvent.getPosition()); |
| if(nestedEvent.getVeto()) { |
| changeEvent.setVeto(true); |
| } |
| } |
| } |
| }; |
| |
| private Object currentOuterValue; |
| |
| private Object feature; |
| |
| private IUpdatableCollection innerUpdatableCollection; |
| |
| private IDataBindingContext databindingContext; |
| |
| private Class elementType; |
| |
| /** |
| * @param databindingContext |
| * @param outerUpdatableValue |
| * @param feature |
| * @param elementType |
| */ |
| public NestedUpdatableCollection(IDataBindingContext databindingContext, |
| final IUpdatableValue outerUpdatableValue, Object feature, |
| Class elementType) { |
| this.databindingContext = databindingContext; |
| this.feature = feature; |
| this.elementType = elementType; |
| updateInnerUpdatableValue(outerUpdatableValue); |
| IChangeListener outerChangeListener = new IChangeListener() { |
| public void handleChange(ChangeEvent changeEvent) { |
| updateInnerUpdatableValue(outerUpdatableValue); |
| fireChangeEvent(ChangeEvent.CHANGE, null, null); |
| } |
| }; |
| outerUpdatableValue.addChangeListener(outerChangeListener); |
| } |
| |
| private void updateInnerUpdatableValue(IUpdatableValue outerUpdatableValue) { |
| currentOuterValue = outerUpdatableValue.getValue(); |
| if (innerUpdatableCollection != null) { |
| innerUpdatableCollection.removeChangeListener(innerChangeListener); |
| innerUpdatableCollection.dispose(); |
| } |
| if (currentOuterValue == null) { |
| innerUpdatableCollection = null; |
| } else { |
| this.innerUpdatableCollection = (IUpdatableCollection) databindingContext |
| .createUpdatable(new Property( |
| currentOuterValue, feature, elementType, Boolean.TRUE)); |
| Class innerElementType = innerUpdatableCollection |
| .getElementType(); |
| if (elementType == null) { |
| elementType = innerElementType; |
| } else { |
| Assert.isTrue(elementType.equals(innerElementType), "Cannot change element type in a nested updatable collection"); //$NON-NLS-1$ |
| } |
| innerUpdatableCollection.addChangeListener(innerChangeListener); |
| } |
| } |
| |
| // public void setValue(Object value) { |
| // innerUpdatableValue.setValue(value); |
| // } |
| // |
| // public Object getValue() { |
| // return innerUpdatableValue == null ? null : innerUpdatableValue |
| // .getValue(); |
| // } |
| // |
| // public Class getValueType() { |
| // return featureType; |
| // } |
| |
| public void dispose() { |
| super.dispose(); |
| if (innerUpdatableCollection != null) { |
| innerUpdatableCollection.dispose(); |
| } |
| currentOuterValue = null; |
| databindingContext = null; |
| feature = null; |
| innerUpdatableCollection = null; |
| innerChangeListener = null; |
| } |
| |
| public int getSize() { |
| return innerUpdatableCollection == null ? 0 : innerUpdatableCollection |
| .getSize(); |
| } |
| |
| public int addElement(Object value, int index) { |
| return innerUpdatableCollection.addElement(value, index); |
| } |
| |
| public void removeElement(int index) { |
| innerUpdatableCollection.removeElement(index); |
| } |
| |
| public void setElement(int index, Object value) { |
| innerUpdatableCollection.setElement(index, value); |
| } |
| |
| public Object getElement(int index) { |
| return innerUpdatableCollection.getElement(index); |
| } |
| |
| public Class getElementType() { |
| return elementType; |
| } |
| |
| } |