Mercurial > projects > dwt2
view org.eclipse.core.databinding/src/org/eclipse/core/internal/databinding/observable/masterdetail/DetailObservableValue.d @ 85:6be48cf9f95c
Work on databinding
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 18 Apr 2009 13:54:50 +0200 |
parents | 0a55d2d5a946 |
children |
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/******************************************************************************* * 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 * Brad Reynolds - bug 147515 *******************************************************************************/ module org.eclipse.core.internal.databinding.observable.masterdetail.DetailObservableValue; import java.lang.all; import org.eclipse.core.databinding.observable.Diffs; import org.eclipse.core.databinding.observable.IObserving; import org.eclipse.core.databinding.observable.masterdetail.IObservableFactory; import org.eclipse.core.databinding.observable.value.AbstractObservableValue; import org.eclipse.core.databinding.observable.value.IObservableValue; import org.eclipse.core.databinding.observable.value.IValueChangeListener; import org.eclipse.core.databinding.observable.value.ValueChangeEvent; import org.eclipse.core.runtime.Assert; /** * @since 1.0 * */ public class DetailObservableValue : AbstractObservableValue , IObserving { private bool updating = false; private IValueChangeListener innerChangeListener; class InnerChangeListener : IValueChangeListener { public void handleValueChange(ValueChangeEvent event) { if (!updating) { fireValueChange(event.diff); } } }; private Object currentOuterValue; private IObservableValue innerObservableValue; private Object detailType; private IObservableValue outerObservableValue; private IObservableFactory factory; /** * @param outerObservableValue * @param factory * @param detailType */ public this(IObservableValue outerObservableValue, IObservableFactory factory, Object detailType) { innerChangeListener = new InnerChangeListener(); outerChangeListener = new OuterChangeListener(); super(outerObservableValue.getRealm()); this.factory = factory; this.detailType = detailType; this.outerObservableValue = outerObservableValue; updateInnerObservableValue(outerObservableValue); outerObservableValue.addValueChangeListener(outerChangeListener); } IValueChangeListener outerChangeListener; class OuterChangeListener : IValueChangeListener { public void handleValueChange(ValueChangeEvent event) { Object oldValue = doGetValue(); updateInnerObservableValue(outerObservableValue); fireValueChange(Diffs.createValueDiff(oldValue, doGetValue())); } }; private void updateInnerObservableValue( IObservableValue outerObservableValue) { currentOuterValue = outerObservableValue.getValue(); if (innerObservableValue !is null) { innerObservableValue.removeValueChangeListener(innerChangeListener); innerObservableValue.dispose(); } if (currentOuterValue is null) { innerObservableValue = null; } else { this.innerObservableValue = cast(IObservableValue) factory .createObservable(currentOuterValue); Object innerValueType = innerObservableValue.getValueType(); if (detailType !is null) { Assert .isTrue( cast(bool)detailType.opEquals(innerValueType), Format("Cannot change value type in a nested observable value, from {} to {}", innerValueType, detailType)); //$NON-NLS-1$ //$NON-NLS-2$ } innerObservableValue.addValueChangeListener(innerChangeListener); } } public void doSetValue(Object value) { if (innerObservableValue !is null) innerObservableValue.setValue(value); } public Object doGetValue() { return innerObservableValue is null ? null : innerObservableValue .getValue(); } public Object getValueType() { return detailType; } public void dispose() { super.dispose(); if (outerObservableValue !is null) { outerObservableValue.removeValueChangeListener(outerChangeListener); outerObservableValue.dispose(); } if (innerObservableValue !is null) { innerObservableValue.removeValueChangeListener(innerChangeListener); innerObservableValue.dispose(); } currentOuterValue = null; factory = null; innerObservableValue = null; innerChangeListener = null; } public Object getObserved() { if ( null !is cast(IObserving)innerObservableValue ) { return (cast(IObserving)innerObservableValue).getObserved(); } return null; } }